633 lines
14 KiB
C++
633 lines
14 KiB
C++
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#include "stdafx.h"
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#include "xmlutil.h"
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/////////////////////////////////////////////////////
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// helpers for encoding and decoding of C++
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// data structures to and from XML PCDATA fields
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WCHAR EncodeByteToWchar(IN BYTE b)
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{
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ASSERT(b <= 0x0f); // low nibble
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if(b <= 9)
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return static_cast<WCHAR>(b + L'0');
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else
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return static_cast<WCHAR>((b-10) + L'a');
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}
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BYTE DecodeWcharToByte(IN WCHAR ch)
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{
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BYTE byte = 0;
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if ((ch >= L'0') && (ch <= L'9'))
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{
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byte = static_cast<BYTE>((ch - L'0') & 0xff);
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}
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else if ((ch >= L'a') && (ch <= L'f'))
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{
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byte = static_cast<BYTE>(((ch - L'a')+10) & 0xff);
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}
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else if ((ch >= L'A') && (ch <= L'F'))
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{
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byte = static_cast<BYTE>(((ch - L'A')+10) & 0xff);
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}
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else
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{
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ASSERT(FALSE);
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byte = 0xFF;
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}
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return byte;
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}
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HRESULT EncodeBlobToBSTR(IN BYTE* pBlob, IN ULONG nBytes, OUT BSTR* pBstr)
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{
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ASSERT(pBstr != NULL);
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*pBstr = NULL;
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if ((pBlob == NULL) || (nBytes == 0))
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{
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return E_POINTER;
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}
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ULONG nChars = 2*nBytes;
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*pBstr = SysAllocStringLen(NULL, nChars);
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if (*pBstr == NULL)
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{
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return E_OUTOFMEMORY;
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}
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WCHAR* pCurr = *pBstr;
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for (ULONG k=0; k< nBytes; k++)
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{
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*pCurr = EncodeByteToWchar(static_cast<BYTE>((pBlob[k]>>4) & 0xff));
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pCurr++;
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*pCurr = EncodeByteToWchar(static_cast<BYTE>(pBlob[k] & 0x0f));
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pCurr++;
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}
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return S_OK;
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}
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void DecodeLoop(IN LPCWSTR lpsz, OUT BYTE* pByte, OUT ULONG nBytes)
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{
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for (ULONG k=0; k< nBytes; k++)
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{
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BYTE bHigh = DecodeWcharToByte(lpsz[2*k]);
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BYTE bLow = DecodeWcharToByte(lpsz[(2*k)+1]);
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pByte[k] = static_cast<BYTE>((bHigh<<4) | bLow);
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}
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}
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HRESULT DecodeBSTRtoBlob(IN BSTR bstr, OUT BYTE** ppByte, OUT ULONG* pnBytes)
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{
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*ppByte = NULL;
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*pnBytes = 0;
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if ((bstr == NULL) || (ppByte == NULL) || (pnBytes == NULL))
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{
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// bad parameters
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return E_POINTER;
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}
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// compute the length of the BSTR
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ULONG nChars = static_cast<ULONG>(wcslen(bstr));
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if (nChars == 0)
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{
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return E_INVALIDARG;
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}
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// must be even
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size_t nBytes = nChars/2;
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if (nBytes*2 != nChars)
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{
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return E_INVALIDARG;
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}
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// allocate memory and set the buffer length
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*ppByte = (BYTE*)malloc(nBytes);
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if (*ppByte == NULL)
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{
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return E_OUTOFMEMORY;
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}
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*pnBytes = static_cast<ULONG>(nBytes);
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DecodeLoop(bstr, *ppByte, static_cast<UINT>(nBytes));
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return TRUE;
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}
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//
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// given a BSTR containing the encoding of a struct
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// it loads it into a buffer, pByte of size nBytes
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//
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HRESULT DecodeBSTRtoStruct(IN BSTR bstr, IN BYTE* pByte, IN ULONG nBytes)
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{
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ASSERT(pByte != NULL);
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ASSERT(pByte != NULL);
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if ( (bstr == NULL) && (pByte == NULL) )
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{
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// bad parameters
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return E_POINTER;
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}
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// compute the length of the BSTR
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size_t nChars = wcslen(bstr);
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if (nChars == 0)
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{
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return E_INVALIDARG;
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}
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// must be even (because of encoding)
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ULONG nBstrBytes = static_cast<ULONG>(nChars/2);
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if (nBstrBytes*2 != nChars)
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{
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ASSERT(FALSE);
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return E_INVALIDARG;
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}
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// must match the struct length
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if (nBstrBytes != nBytes)
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{
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ASSERT(FALSE);
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return E_INVALIDARG;
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}
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DecodeLoop(bstr, pByte, nBytes);
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return S_OK;
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}
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HRESULT EncodeBoolToBSTR(IN BOOL b, OUT BSTR* pBstr)
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{
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if (pBstr == NULL)
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{
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return E_POINTER;
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}
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*pBstr = SysAllocString(b ? L"TRUE" : L"FALSE");
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if (*pBstr == NULL)
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{
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return E_OUTOFMEMORY;
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}
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return S_OK;
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}
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HRESULT DecodeBSTRtoBool(IN BSTR bstr, OUT BOOL* pb)
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{
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if (bstr == NULL)
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{
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return E_INVALIDARG;
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}
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if (pb == NULL)
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{
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return E_POINTER;
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}
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if (CompareNoCase(bstr, L"TRUE"))
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{
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*pb = TRUE;
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return S_OK;
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}
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if (CompareNoCase(bstr, L"FALSE"))
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{
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*pb = FALSE;
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return S_OK;
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}
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return E_INVALIDARG;
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}
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/*
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HRESULT EncodeIntToBSTR(IN int n, OUT BSTR* pBstr)
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{
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int i = n;
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pBstr = NULL;
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return E_NOTIMPL;
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}
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HRESULT DecodeIntToBool(IN BSTR bstr, OUT int* pN)
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{
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//
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// This doesn't do anything useful
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//
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*pN = 0;
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return E_NOTIMPL;
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}
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*/
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///////////////////////////////////////////////////////////////////////
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// XML SPECIFIC FUNCTIONS
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///////////////////////////////////////////////////////////////////////
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//
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// given an XML node, it retrieves the node name
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// and compares it with the given string
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//
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BOOL XMLIsNodeName(IXMLDOMNode* pXDN, LPCWSTR lpszName)
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{
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ASSERT(lpszName != NULL);
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ASSERT(pXDN != NULL);
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CComBSTR bstrName;
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HRESULT hr = pXDN->get_nodeName(&bstrName);
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ASSERT(SUCCEEDED(hr));
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if (FAILED(hr))
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{
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return FALSE;
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}
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return CompareXMLTags(bstrName, lpszName);
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}
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//
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// given an XML node of type NODE_TEXT, it
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// returns its value into a BSTR
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//
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HRESULT XML_GetNodeText(IXMLDOMNode* pXDN, BSTR* pBstr)
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{
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ASSERT(pXDN != NULL);
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ASSERT(pBstr != NULL);
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// null out output value
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*pBstr = NULL;
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// assume the given node has a child node
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CComPtr<IXMLDOMNode> spName;
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HRESULT hr = pXDN->get_firstChild(&spName);
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if (FAILED(hr))
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{
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// unexpected failure
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return hr;
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}
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// if no children, the api returns S_FALSE
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if (spName == NULL)
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{
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return hr;
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}
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// got now a valid pointer,
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// check if this is the valid node type
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DOMNodeType nodeType;
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hr = spName->get_nodeType(&nodeType);
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ASSERT(hr == S_OK);
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ASSERT(nodeType == NODE_TEXT);
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if (nodeType != NODE_TEXT)
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{
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ASSERT(FALSE);
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return E_INVALIDARG;
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}
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// it is of type text
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// retrieve the node value into a variant
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CComVariant val;
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hr = pXDN->get_nodeTypedValue(&val);
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if (FAILED(hr))
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{
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// unexpected failure
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ASSERT(FALSE);
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return hr;
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}
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if (val.vt != VT_BSTR)
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{
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ASSERT(FALSE);
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return E_INVALIDARG;
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}
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// got the text value, package it into a BSTR
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*pBstr = ::SysAllocString(val.bstrVal);
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return S_OK;
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}
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//
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// given an XML node of type NODE_TEXT, containing an encoding of
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// a struct and given a buffer pByte of length nBytes, it decodes the
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// node and fills it in the buffer
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//
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HRESULT XML_GetNodeStruct(IXMLDOMNode* pXDN, BYTE* pByte, ULONG nBytes)
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{
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CComBSTR bstr;
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HRESULT hr = XML_GetNodeText(pXDN, &bstr);
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if (FAILED(hr))
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{
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return hr;
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}
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return DecodeBSTRtoStruct(bstr, pByte, nBytes);
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}
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//
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// given an XML node of type NODE_TEXT, containing an encoding of
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// a blob it decodes the string and allocates *pnBytes of memory
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// and fills it in the buffer
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//
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HRESULT XML_GetNodeBlob(IXMLDOMNode* pXDN, BYTE** ppByte, ULONG* pnBytes)
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{
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CComBSTR bstr;
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HRESULT hr = XML_GetNodeText(pXDN, &bstr);
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if (FAILED(hr))
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{
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return hr;
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}
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return DecodeBSTRtoBlob(bstr, ppByte, pnBytes);
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}
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//
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// given an XML node of type NODE_TEXT, containing an encoding of
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// a BOOL value it returns a value into a BOOL*
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//
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HRESULT XML_GetNodeBOOL(IXMLDOMNode* pXDN, BOOL* pb)
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{
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CComBSTR bstr;
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HRESULT hr = XML_GetNodeText(pXDN, &bstr);
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if (FAILED(hr))
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{
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return hr;
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}
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return DecodeBSTRtoBool(bstr, pb);
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}
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HRESULT XML_GetNodeDWORD(IXMLDOMNode* pXDN, DWORD* pdw)
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{
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CComBSTR bstr;
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HRESULT hr = XML_GetNodeText(pXDN, &bstr);
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if (FAILED(hr))
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{
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return hr;
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}
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long lVal = _wtol(bstr);
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*pdw = static_cast<DWORD>(lVal);
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return hr;
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}
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//
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// given an XML node and a tag for a node, it
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// searches the subtree (depth first) to find the
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// first occurrence and returns the associated XML node
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//
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HRESULT XML_FindSubtreeNode(IXMLDOMNode* pXMLCurrentRootNode,
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LPCWSTR lpszNodeTag,
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IXMLDOMNode** ppXMLNode)
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{
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ASSERT(pXMLCurrentRootNode != NULL);
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ASSERT(lpszNodeTag != NULL);
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ASSERT(ppXMLNode != NULL);
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*ppXMLNode = NULL; // null out return value
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// get the list of child nodes
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CComPtr<IXMLDOMNode> spCurrChild;
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HRESULT hr = pXMLCurrentRootNode->get_firstChild(&spCurrChild);
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if (FAILED(hr))
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{
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return hr;
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}
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if (spCurrChild == NULL)
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{
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return S_OK; // end of the recursion
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}
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// recurse down on children
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while (spCurrChild != NULL)
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{
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CComBSTR bstrChildName;
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hr = spCurrChild->get_nodeName(&bstrChildName);
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if (FAILED(hr))
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{
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return hr;
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}
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if (bstrChildName != NULL)
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{
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//wprintf(L"bstrChildName = %s\n", bstrChildName);
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if (CompareXMLTags(bstrChildName, lpszNodeTag))
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{
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// got the node we want
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(*ppXMLNode) = spCurrChild;
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(*ppXMLNode)->AddRef();
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return S_OK;
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}
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}
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// go down recursively on the current child
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|
|
hr = XML_FindSubtreeNode(spCurrChild, lpszNodeTag, ppXMLNode);
|
||
|
|
if (FAILED(hr))
|
||
|
|
{
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
if (*ppXMLNode != NULL)
|
||
|
|
{
|
||
|
|
// got it from the recursion, just return
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
// keep going to the next child node
|
||
|
|
CComPtr<IXMLDOMNode> spTemp = spCurrChild;
|
||
|
|
spCurrChild = NULL;
|
||
|
|
spTemp->get_nextSibling(&spCurrChild);
|
||
|
|
}
|
||
|
|
|
||
|
|
// not found in the recursion and in the loop above
|
||
|
|
// need to return S_OK, we will check the output pointer
|
||
|
|
return S_OK;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// function to walk the list of children of a node
|
||
|
|
// and print some information
|
||
|
|
// NOTICE: this is for debugging and learning purposes
|
||
|
|
// more than for getting real info
|
||
|
|
//
|
||
|
|
void XML_PrintTreeRaw(IXMLDOMNode* pXDN, int nLevel)
|
||
|
|
{
|
||
|
|
PrintIdentation(nLevel);
|
||
|
|
|
||
|
|
//
|
||
|
|
// get the name and type of the node
|
||
|
|
//
|
||
|
|
CComBSTR bstrName;
|
||
|
|
pXDN->get_nodeName(&bstrName);
|
||
|
|
|
||
|
|
CComBSTR bstrType;
|
||
|
|
pXDN->get_nodeTypeString(&bstrType);
|
||
|
|
|
||
|
|
DOMNodeType nodeType;
|
||
|
|
pXDN->get_nodeType(&nodeType);
|
||
|
|
|
||
|
|
TRACE(L"Name = %s, Type = %d (%s) ", bstrName, nodeType, bstrType);
|
||
|
|
if (nodeType == NODE_TEXT)
|
||
|
|
{
|
||
|
|
CComVariant val;
|
||
|
|
pXDN->get_nodeTypedValue(&val);
|
||
|
|
if (val.vt == VT_BSTR)
|
||
|
|
{
|
||
|
|
TRACE(L"Val = %s", val.bstrVal);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
TRACE(L"\n");
|
||
|
|
|
||
|
|
// get the list of child nodes
|
||
|
|
CComPtr<IXMLDOMNode> spCurrChild;
|
||
|
|
pXDN->get_firstChild(&spCurrChild);
|
||
|
|
if (spCurrChild == NULL)
|
||
|
|
{
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
// recurse down on children
|
||
|
|
while (spCurrChild != NULL)
|
||
|
|
{
|
||
|
|
XML_PrintTreeRaw(spCurrChild, nLevel+1);
|
||
|
|
|
||
|
|
CComPtr<IXMLDOMNode> temp = spCurrChild;
|
||
|
|
spCurrChild = NULL;
|
||
|
|
temp->get_nextSibling(&spCurrChild);
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
void PrintIdentation(int iLevel)
|
||
|
|
{
|
||
|
|
for (int k=0; k<iLevel;k++)
|
||
|
|
{
|
||
|
|
// wprintf(L" ");
|
||
|
|
TRACE(L" ");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////
|
||
|
|
///////////////////////////////////////////////////////////////////
|
||
|
|
///////////////////////////////////////////////////////////////////
|
||
|
|
|
||
|
|
//
|
||
|
|
// given an XML document,it creates an XML node of the given type
|
||
|
|
// and with the given name
|
||
|
|
//
|
||
|
|
HRESULT XML_CreateDOMNode(IXMLDOMDocument* pDoc,
|
||
|
|
DOMNodeType type, LPCWSTR lpszName,
|
||
|
|
IXMLDOMNode** ppXMLDOMNode)
|
||
|
|
{
|
||
|
|
*ppXMLDOMNode = NULL;
|
||
|
|
CComVariant vtype((long)type, VT_I4);
|
||
|
|
|
||
|
|
CComBSTR bstrName = lpszName;
|
||
|
|
HRESULT hr = pDoc->createNode(vtype, bstrName, NULL, ppXMLDOMNode);
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_AppendChildDOMNode(IXMLDOMNode* pXMLContainerNode,
|
||
|
|
IXMLDOMNode* pXMLChildNode)
|
||
|
|
{
|
||
|
|
CComPtr<IXMLDOMNode> p;
|
||
|
|
CComVariant after;
|
||
|
|
after.vt = VT_EMPTY;
|
||
|
|
HRESULT hr = pXMLContainerNode->appendChild(pXMLChildNode, &p);
|
||
|
|
return hr;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_CreateTextDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
LPCWSTR lpszNodeData,
|
||
|
|
IXMLDOMNode** ppNode)
|
||
|
|
{
|
||
|
|
*ppNode = NULL;
|
||
|
|
|
||
|
|
CComPtr<IXMLDOMNode> spXMLDOMNodeName;
|
||
|
|
HRESULT hr = XML_CreateDOMNode(pXMLDoc, NODE_ELEMENT, lpszNodeTag, &spXMLDOMNodeName);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
|
||
|
|
CComPtr<IXMLDOMNode> spXMLDOMNodeNameval;
|
||
|
|
hr = XML_CreateDOMNode(pXMLDoc, NODE_TEXT, NULL, &spXMLDOMNodeNameval);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
|
||
|
|
CComVariant val = lpszNodeData;
|
||
|
|
spXMLDOMNodeNameval->put_nodeTypedValue(val);
|
||
|
|
|
||
|
|
hr = XML_AppendChildDOMNode(spXMLDOMNodeName, spXMLDOMNodeNameval);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
|
||
|
|
(*ppNode) = spXMLDOMNodeName;
|
||
|
|
(*ppNode)->AddRef();
|
||
|
|
return hr;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
HRESULT XML_CreateStructDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
BYTE* pByte, ULONG nBytes,
|
||
|
|
IXMLDOMNode** ppNode)
|
||
|
|
{
|
||
|
|
CComBSTR bstr;
|
||
|
|
HRESULT hr = EncodeBlobToBSTR(pByte, nBytes, &bstr);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
return XML_CreateTextDataNode(pXMLDoc, lpszNodeTag, bstr, ppNode);
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_CreateBOOLDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
BOOL b,
|
||
|
|
IXMLDOMNode** ppNode)
|
||
|
|
{
|
||
|
|
CComBSTR bstr;
|
||
|
|
HRESULT hr = EncodeBoolToBSTR(b, &bstr);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
return XML_CreateTextDataNode(pXMLDoc, lpszNodeTag, bstr, ppNode);
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_CreateDWORDDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
DWORD dwVal,
|
||
|
|
IXMLDOMNode** ppNode)
|
||
|
|
{
|
||
|
|
CString szTemp;
|
||
|
|
szTemp.Format(L"%d", dwVal);
|
||
|
|
|
||
|
|
CComBSTR bstr;
|
||
|
|
bstr = szTemp.AllocSysString();
|
||
|
|
return XML_CreateTextDataNode(pXMLDoc, lpszNodeTag, bstr, ppNode);
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_AppendStructDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
IXMLDOMNode* pXMLNode,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
BYTE* pByte,
|
||
|
|
ULONG nBytes)
|
||
|
|
{
|
||
|
|
CComPtr<IXMLDOMNode> spXMLDOMNodeName;
|
||
|
|
HRESULT hr = XML_CreateStructDataNode(pXMLDoc, lpszNodeTag, pByte, nBytes, &spXMLDOMNodeName);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
return XML_AppendChildDOMNode(pXMLNode, spXMLDOMNodeName);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
HRESULT XML_AppendTextDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
IXMLDOMNode* pXMLNode,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
LPCWSTR lpszNodeData)
|
||
|
|
{
|
||
|
|
CComPtr<IXMLDOMNode> spXMLDOMNodeName;
|
||
|
|
HRESULT hr = XML_CreateTextDataNode(pXMLDoc, lpszNodeTag, lpszNodeData, &spXMLDOMNodeName);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
|
||
|
|
return hr = XML_AppendChildDOMNode(pXMLNode, spXMLDOMNodeName);
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_AppendBOOLDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
IXMLDOMNode* pXMLNode,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
BOOL b)
|
||
|
|
{
|
||
|
|
CComPtr<IXMLDOMNode> spXMLDOMNodeName;
|
||
|
|
HRESULT hr = XML_CreateBOOLDataNode(pXMLDoc, lpszNodeTag, b, &spXMLDOMNodeName);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
|
||
|
|
return hr = XML_AppendChildDOMNode(pXMLNode, spXMLDOMNodeName);
|
||
|
|
}
|
||
|
|
|
||
|
|
HRESULT XML_AppendDWORDDataNode(IXMLDOMDocument* pXMLDoc,
|
||
|
|
IXMLDOMNode* pXMLNode,
|
||
|
|
LPCWSTR lpszNodeTag,
|
||
|
|
DWORD dwVal)
|
||
|
|
{
|
||
|
|
CComPtr<IXMLDOMNode> spXMLDOMNodeName;
|
||
|
|
HRESULT hr = XML_CreateDWORDDataNode(pXMLDoc, lpszNodeTag, dwVal, &spXMLDOMNodeName);
|
||
|
|
RETURN_IF_FAILED(hr);
|
||
|
|
return XML_AppendChildDOMNode(pXMLNode, spXMLDOMNodeName);
|
||
|
|
}
|