145 lines
2.6 KiB
C++
145 lines
2.6 KiB
C++
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/*++
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Copyright (C) 1996-1999 Microsoft Corporation
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Module Name:
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bstrutil.cpp
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Abstract:
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B string utility functions.
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--*/
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#include "ole2.h"
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#include "bstrutil.h"
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INT SysStringAnsiLen (
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IN BSTR bstr
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)
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{
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if (bstr == NULL)
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return 0;
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#ifndef OLE2ANSI
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return WideCharToMultiByte(CP_ACP, 0, bstr, SysStringLen(bstr),
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NULL, 0, NULL, NULL);
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#else
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return SysStringLen(bstr);
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#endif
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}
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HRESULT BStrToStream (
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IN LPSTREAM pIStream,
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IN INT nMbChar,
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IN BSTR bstr
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)
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{
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LPSTR pchBuf;
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HRESULT hr;
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// If empty string just return
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if (SysStringLen(bstr) == 0)
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return NO_ERROR;
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#ifndef OLE2ANSI
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// Convert to multibyte string
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pchBuf = new char[nMbChar + 1];
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if (pchBuf == NULL)
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return E_OUTOFMEMORY;
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WideCharToMultiByte(CP_ACP, 0, bstr, SysStringLen(bstr),
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pchBuf, nMbChar+1, NULL, NULL);
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// Write string to stream
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hr = pIStream->Write(pchBuf, nMbChar, NULL);
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delete [] pchBuf;
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#else
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hr = pIStream->Write(bstr, nMbChar, NULL);
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#endif
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return hr;
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}
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HRESULT BStrFromStream (
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IN LPSTREAM pIStream,
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IN INT nChar,
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OUT BSTR *pbstrRet
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)
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{
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HRESULT hr;
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BSTR bstr;
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ULONG nRead;
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LPSTR pchBuf;
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INT nWChar;
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*pbstrRet = NULL;
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// if zero-length string just return
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if (nChar == 0)
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return NO_ERROR;
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#ifndef OLE2ANSI
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// Allocate char array and read in string
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pchBuf = new char[nChar];
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if (pchBuf == NULL)
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return E_OUTOFMEMORY;
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hr = pIStream->Read(pchBuf, nChar, &nRead);
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// Verify read count
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if (!FAILED(hr)) {
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if (nRead != (ULONG)nChar)
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hr = E_FAIL;
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}
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if (!FAILED(hr)) {
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// Allocate BString for UNICODE translation
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nWChar = MultiByteToWideChar(CP_ACP, 0, pchBuf, nChar, NULL, 0);
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bstr = SysAllocStringLen(NULL, nWChar);
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if (bstr != NULL) {
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MultiByteToWideChar(CP_ACP, 0, pchBuf, nChar, bstr, nWChar);
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bstr[nWChar] = 0;
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*pbstrRet = bstr;
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}
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else
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hr = E_OUTOFMEMORY;
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}
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delete [] pchBuf;
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#else
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// Allocate BString
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bstr = SysAllocStringLen(NULL, nChar);
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if (bstr == NULL)
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return E_OUTOFMEMORY;
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// Read in string
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hr = pIStream->Read(bstr, nChar, &nRead);
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// Verify read count
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if (!FAILED(hr)) {
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if (nRead != (ULONG)nChar)
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hr = E_FAIL;
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}
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// Return or free string
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if (!FAILED(hr))
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*pbstrRet = bstr;
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else
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SysFreeString(bstr);
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#endif
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return hr;
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}
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