332 lines
8.1 KiB
C++
332 lines
8.1 KiB
C++
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/*++
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Copyright (C) 1995-2001 Microsoft Corporation
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Module Name:
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DATACONV.CPP
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Abstract:
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Provides a some generic data conversion routines. In particular,
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OMSVariantChangeType and OMSVariantClear provide the same
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capabilities as the Ole VariantChangeType and VariantClear
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functions except that the OMS versions handle more data types.
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History:
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a-davj 19-Oct-95 Created.
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--*/
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#include "precomp.h"
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#include "resource.h"
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#include "CVariant.h"
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#include <ole2.h>
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//***************************************************************************
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//
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// char * WideToNarrow
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//
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// DESCRIPTION:
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//
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// Takes a WCHAR string and creates a MBS equivalent. The caller should
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// free the string when done.
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//
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// PARAMETERS:
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//
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// pConv UNICODE string to convert.
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//
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// RETURN VALUE:
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//
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// NULL if out of memory, otherwise a mbs string that the caller should free
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// via CoTaskMemFree.
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//
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//***************************************************************************
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char * WideToNarrow(
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IN LPCWSTR pConv)
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{
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char * cpRet = NULL;
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int iMBSLen = wcstombs(NULL,pConv,0) + 1;
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if(iMBSLen == 0)
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return NULL;
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cpRet = (char *)CoTaskMemAlloc(iMBSLen);
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if(cpRet)
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{
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memset(cpRet, 0, iMBSLen);
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wcstombs(cpRet,pConv,iMBSLen);
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}
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return cpRet;
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}
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int gDiag;
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char * WideToNarrowA(
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IN LPCWSTR pConv)
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{
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char * cpRet = NULL;
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int iMBSLen = wcstombs(NULL,pConv,0) + 1;
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if(iMBSLen == 0)
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return NULL;
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cpRet = new char[iMBSLen];
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gDiag = iMBSLen;
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if(cpRet)
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{
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memset(cpRet, 0, iMBSLen);
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wcstombs(cpRet,pConv,iMBSLen);
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}
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return cpRet;
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}
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//***************************************************************************
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//
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// SAFEARRAY * OMSSafeArrayCreate
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//
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// DESCRIPTION:
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//
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// Creates a safe array.
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//
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// PARAMETERS:
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//
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// vt element type
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// iNumElements number of elements
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//
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// RETURN VALUE:
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//
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// Returns null if there is a problem.
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//
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//***************************************************************************
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SAFEARRAY * OMSSafeArrayCreate(
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IN VARTYPE vt,
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IN int iNumElements)
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{
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if(iTypeSize(vt) < 1 || iNumElements < 1)
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return NULL;
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SAFEARRAYBOUND rgsabound[1];
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rgsabound[0].lLbound = 0;
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rgsabound[0].cElements = iNumElements;
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return SafeArrayCreate(vt,1,rgsabound);
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}
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//***************************************************************************
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//
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// SCODE OMSVariantChangeType
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//
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// DESCRIPTION:
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//
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// Converts a variant from one type into another. This functions takes the
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// same arguments and does the same action as the standard
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// VariantChangeType except that it also handles arrays.
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//
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//
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// PARAMETERS:
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//
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// pDest points to the variant which is to be updated
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// pSrc points to the variant that is the source
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// wFlags flags which are passed on to VariantChangeType
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// vtDest Type that the pDest is conveted to
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//
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// RETURN VALUE:
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//
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// S_OK All is well.
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// WBEM_E_INVALID_PARAMETER Invalid argument
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// WBEM_E_OUT_OF_MEMORY Out of memory
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// otherwise various return codes from VariantChangeType, or safe array
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// manipulation
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//
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//***************************************************************************
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HRESULT OMSVariantChangeType(
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IN OUT VARIANTARG * pDest,
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IN VARIANTARG *pSrc,
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IN USHORT wFlags,
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IN VARTYPE vtDest)
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{
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SCODE sc;
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// Verify arguments and clear out the destination
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if(pDest == NULL || pSrc == NULL || iTypeSize(vtDest)<1 || iTypeSize(pSrc->vt)<1)
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return WBEM_E_INVALID_PARAMETER; // Junk args
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OMSVariantClear(pDest);
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// if both are arrays,
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if(vtDest & VT_ARRAY && pSrc->vt & VT_ARRAY) {
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// Set the VARTYPES without the VT_ARRAY bits
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VARTYPE vtDestSimple = vtDest & ~VT_ARRAY;
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VARTYPE vtSrcSimple = pSrc->vt &~ VT_ARRAY;
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// Determine the size of the source array. Also make sure that the array
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// only has one dimension
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unsigned int uDim = SafeArrayGetDim(pSrc->parray);
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if(uDim != 1)
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return WBEM_E_FAILED; // Bad array, or too many dimensions
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long ix[2] = {0,0};
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long lLower, lUpper;
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sc = SafeArrayGetLBound(pSrc->parray,1,&lLower);
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if(sc != S_OK)
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return sc;
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sc = SafeArrayGetUBound(pSrc->parray,1,&lUpper);
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if(sc != S_OK)
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return sc;
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int iNumElements = lUpper - lLower +1;
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// Create a destination array of equal size
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SAFEARRAY * pDestArray = OMSSafeArrayCreate(vtDestSimple,iNumElements);
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if(pDestArray == NULL)
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return WBEM_E_FAILED; // Most likely a bad type!
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// For each element in the source array
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for(ix[0] = lLower; ix[0] <= lUpper && sc == S_OK; ix[0]++) {
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CVariant varSrc, varDest;
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// Set Temp CVariant to the source data
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sc = SafeArrayGetElement(pSrc->parray,ix,varSrc.GetDataPtr());
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if(sc != S_OK)
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break;
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varSrc.SetType(vtSrcSimple);
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// Convert to destination data using VariantConvert
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sc = VariantChangeType(varDest.GetVarPtr(),varSrc.GetVarPtr(),wFlags,vtDestSimple);
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if(sc != S_OK)
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break;
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// Set destination data into the array
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if(vtDestSimple == VT_BSTR || vtDestSimple == VT_UNKNOWN ||
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vtDestSimple == VT_DISPATCH)
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sc = SafeArrayPutElement(pDestArray,ix,(void *)varDest.GetBstr());
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else
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sc = SafeArrayPutElement(pDestArray,ix,(void *)varDest.GetDataPtr());
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}
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if(sc != S_OK){
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SafeArrayDestroy(pDestArray);
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}
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else {
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// set the VARTYPE of the destination
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pDest->vt = vtDest;
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pDest->parray = pDestArray;
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}
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return sc;
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}
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// if one, but not the other is an array, bail out
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if(vtDest & VT_ARRAY || pSrc->vt & VT_ARRAY)
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return WBEM_E_FAILED;
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// Attempt to use standard conversion
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return VariantChangeType(pDest,pSrc,wFlags,vtDest);
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}
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//***************************************************************************
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//
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// OMSVariantClear
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//
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// DESCRIPTION:
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//
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// Does the same as the Ole VariantClear function except
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// that it also sets the data to all 0.
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//
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// PARAMETERS:
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//
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// pClear Variant to be cleared.
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//
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// RETURN VALUE:
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//
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// Result from VariantClear, most always S_OK
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//
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//***************************************************************************
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HRESULT OMSVariantClear(
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IN OUT VARIANTARG * pClear)
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{
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HRESULT sc;
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sc = VariantClear(pClear);
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memset((void *)&pClear->lVal,0,8);
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return sc;
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}
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//***************************************************************************
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//
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// int ITypeSize
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//
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// DESCRIPTION:
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//
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// Gets the number of bytes acutally used to store
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// a variant type. 0 if the type is unknown
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//
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// PARAMETERS:
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//
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// vtTest Type in question.
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//
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//
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// RETURN VALUE:
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//
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// see description
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//
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//***************************************************************************
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int iTypeSize(
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IN VARTYPE vtTest)
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{
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int iRet;
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vtTest &= ~ VT_ARRAY; // get rid of possible array bit
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switch (vtTest) {
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case VT_UI1:
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case VT_LPSTR:
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iRet = 1;
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break;
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case VT_LPWSTR:
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case VT_BSTR:
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case VT_I2:
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iRet = 2;
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break;
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case VT_I4:
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case VT_R4:
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iRet = 4;
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break;
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case VT_R8:
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iRet = 8;
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break;
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case VT_BOOL:
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iRet = sizeof(VARIANT_BOOL);
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break;
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case VT_ERROR:
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iRet = sizeof(SCODE);
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break;
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case VT_CY:
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iRet = sizeof(CY);
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break;
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case VT_DATE:
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iRet = sizeof(DATE);
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break;
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case CIM_SINT64:
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case CIM_UINT64:
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iRet = 8;
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break;
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default:
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iRet = 0;
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}
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return iRet;
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}
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