///////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////// // // File: PropVar.c // // Purpose: This file provides Office-aware routines which // operate on PropVariants. They are Office-aware in // that they only operate on the subset of // VarTypes which are used by Office. // ///////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////// #include "priv.h" #pragma hdrstop ///////////////////////////////////////////////////////////////////////////////// // // Function: FPropVarLoad // // Purpse: Load data into a PropVariant. If the target PropVariant // already contains data, it will be freed. // // Note that new memory is allocated, if necessary, to hold // the data in the PropVariant. Also note that the // resulting PropVariant should be freed by the caller using // PropVariantClear. // // Inputs: LPPROPVARIANT - to be loaded. This should be a valid // (i.e. intialized) PropVariant. // VARTYPE - of the new PropVariant (must be a member of // the limited set used by Office). // LPVOID - Either the data to be loaded, or a pointer // to such data, depending on the type. // // Output: TRUE if and only if successful. // ///////////////////////////////////////////////////////////////////////////////// BOOL FPropVarLoad ( LPPROPVARIANT lppropvar, VARTYPE vt, LPVOID const lpv ) { // ------ // Locals // ------ BOOL fSuccess = FALSE; // Return code ULONG cch, cb; // ---------- // Initialize // ---------- Assert (lppropvar != NULL); Assert (lpv != NULL); // Free any data currently in the PropVariant. PropVariantClear (lppropvar); // --------------------------------------------------- // Set the value of the PropVariant based on the type. // --------------------------------------------------- switch (vt) { // Strings case VT_LPTSTR: // Determine the character and byte count. cch = lstrlen(lpv); // Doesn't include the NULL. cb = (cch + 1) * sizeof(TCHAR); // *Does* include the NULL. // Allocate memory in the PropVariant. lppropvar->pwszVal = CoTaskMemAlloc (cb); if (lppropvar->pwszVal == NULL) { goto Exit; } // Copy the string to the PropVariant and terminate it. StringCchCopy( (LPTSTR)lppropvar->pwszVal, cch + 1, lpv ); lppropvar->pwszVal[cch] = TEXT('\0'); break; // DWORDs case VT_I4: lppropvar->lVal = *(DWORD*) lpv; break; // FileTime case VT_FILETIME: CopyMemory( &lppropvar->filetime, lpv, sizeof(FILETIME) ); break; // Double case VT_R8: CopyMemory( &lppropvar->dblVal, lpv, sizeof(double) ); break; // Bool case VT_BOOL: lppropvar->boolVal = *(VARIANT_BOOL*) lpv ? VARIANT_TRUE : VARIANT_FALSE; break; // Invalid type. default: goto Exit; } // Set the VT of the PropVariant, and we're done. lppropvar->vt = vt; // ---- // Exit // ---- fSuccess = TRUE; Exit: return (fSuccess); } // FPropVarLoad //////////////////////////////////////////////////////////////////////////////// // // Function: FCoStrToWStr // // Purpose: Convert a COM string (ANSI) to a COM wide-string. // ("COM" because the string is allocated using // the COM heap). // // Inputs: LPWSTR* - The converted string. // LPSTR - The original string. // UINT - The ANSI code page. // // Output: TRUE if and only if successful. // //////////////////////////////////////////////////////////////////////////////// BOOL FCoStrToWStr( LPWSTR *lplpwstr, const LPSTR lpstr, UINT uCodePage) { // ------ // Locals // ------ BOOL fSuccess = FALSE; // Return value. ULONG cchBuffer = 0; // Size of converted string (includes NULL). Assert (lpstr != NULL && lplpwstr != NULL); // ------------------ // Convert the string // ------------------ // Make two passes. The first will calculate the // size of the target buffer, the second will actually // make the conversion. *lplpwstr = NULL; while (TRUE) { cchBuffer = MultiByteToWideChar( uCodePage, // Source code page 0, // Default flags lpstr, // Source string -1, // Default length *lplpwstr, // Destination string cchBuffer ); // Max dest string characters. // Is this the second pass (when the conversion should // have taken place)? if (*lplpwstr != NULL) { // If we got a good result, then we're done. if (cchBuffer != 0) { break; } // 0 was returned. There was an error. else { AssertSz (0, TEXT("Couldn't convert MBCS to Wide")); goto Exit; } } // Otherwise, this is the first pass. We need to // allocate a buffer. else { // We should have gotten a positive buffer size. if (cchBuffer == 0) { AssertSz(0, TEXT("MultiByteToWideChar returned invalid target buffer size")); goto Exit; } // Allocate memory for the converted string. else { *lplpwstr = (LPWSTR) CoTaskMemAlloc( cchBuffer * 2 ); if ( *lplpwstr == NULL) { AssertSz (0, TEXT("Could not allocate memory for wide string")); goto Exit; } } } // if( *lplpwstr != NULL ... else } // while (TRUE) // ---- // Exit // ---- fSuccess = TRUE; Exit: // If there was a problem, free the Unicode string. if (!fSuccess) { CoTaskMemFree (*lplpwstr); *lplpwstr = NULL; } return (fSuccess); } // FCoStrToWStr //////////////////////////////////////////////////////////////////////////////// // // Function: FCoWStrToStr // // Purpose: Convert a COM wide-string to an ANSI string. // ("COM" because the string is allocated using // the COM heap). // // Inputs: LPSTR* - The converted string. // LPWSTR - The source string. // UINT - The ANSI code page. // // Output: TRUE if and only if successful. // //////////////////////////////////////////////////////////////////////////////// BOOL FCoWStrToStr( LPSTR *lplpstr, const LPWSTR lpwstr, UINT uCodePage) { // ------ // Locals // ------ BOOL fSuccess = FALSE; // Return result ULONG cch; // Charcters in original string (w/o NULL). ULONG cbBuffer = 0; // Size of target buffer (including NULL) Assert (lpwstr != NULL && lplpstr != NULL); // ------------------ // Convert the String // ------------------ // We'll make two calls to WideCharToMultiByte. // In the first, we'll determine the size required // for the multi-byte string. We'll use this // to allocate memory. In the second pass, we'll actually // make the conversion. cch = wcslen( lpwstr ); // How big is the source string? *lplpstr = NULL; // Initialize the target buffer. while (TRUE) { cbBuffer = WideCharToMultiByte( uCodePage, // Source code page 0, // Default flags lpwstr, // Source string cch + 1, // # chars in wide string (including NULL) *lplpstr, // Destination string cbBuffer, // Size of destination buffer NULL, NULL ); // No default character // Is this the second pass (when the conversion should // have taken place)? if (*lplpstr != NULL) { // If we got a good result, then we're done. if (cbBuffer != 0) { break; } // 0 was returned. There was an error. else { AssertSz (0, TEXT("Couldn't convert Wide to MBCS")); goto Exit; } } // Otherwise, this is the first pass. We need to // allocate a buffer. else { // We should have gotten a positive buffer size. if (cbBuffer == 0) { AssertSz(0, TEXT("WideCharMultiByte returned invalid target buffer size")); goto Exit; } // Allocate memory for the converted string. else { *lplpstr = (LPSTR) CoTaskMemAlloc( cbBuffer ); if ( *lplpstr == NULL) { AssertSz (0, TEXT("Could not allocate memory for wide string")); goto Exit; } } } // if( lpstr != NULL ... else } // while (TRUE) // ---- // Exit // ---- fSuccess = TRUE; Exit: // If there was a problem, free the new string. if (!fSuccess) { CoTaskMemFree (*lplpstr); *lplpstr = NULL; } return (fSuccess); } // FCoWStrToStr ////////////////////////////////////////////////////////////////////////////// // // Function: FPropVarConvertString // // Purpose: Convert a PropVariant from VT_LPSTR to VT_LPWSTR, // or vice-versa. The correct direction is inferred // from the input. The source PropVariant is not // modified. // // If the PropVariant is a Vector, all elements are // converted. // // Inputs: LPPROPVARIANT - The buffer in which to put the // converted PropVariant. // LPPROPVARIANT - The source of the conversion. // UINT - The code page of VT_LPSTRs. // // Output: TRUE if successful. If unsuccessful, the original // PropVariant will be returned unmodified. // // Pre-Conditions: // The input must be either a VT_LPSTR or a VT_LPWSTR // (with or without the VT_VECTOR bit set). // && // The destination PropVariant is VT_EMPTY. // && // The code page must not be CP_WINUNICODE (Unicode // LPSTRs are not legal in the SumInfo property sets). // ////////////////////////////////////////////////////////////////////////////// BOOL FPropVarConvertString( LPPROPVARIANT lppropvarDest, const LPPROPVARIANT lppropvarSource, UINT uCodePage) { // ------ // Locals // ------ BOOL fSuccess = FALSE; // Return code. BOOL fConvertToAnsi; // Indicates the direction of the conversion. LPSTR *lplpstrDest; // Pointer to pointer to a converted string. LPSTR lpstrSource; // Pointer to a string to be converted. ULONG cElems; // The number of strings still requiring conversion ULONG ulIndex = 0; // Index into vector (if this VT is a vector) // ---------- // Initialize // ---------- Assert(lppropvarDest != NULL && lppropvarSource != NULL); Assert(lppropvarDest->vt == VT_EMPTY); Assert(uCodePage != CP_WINUNICODE); // Determine the direction of the conversion. fConvertToAnsi = (lppropvarSource->vt & ~VT_VECTOR) == VT_LPSTR ? FALSE : TRUE; // ----------------------------------- // Initialize based on the Vector bit. // ----------------------------------- if (lppropvarSource->vt & VT_VECTOR) { // We're a vector. cElems = lppropvarSource->calpstr.cElems; // Allocate an array of string pointers, putting it in // lppropvarDest. lppropvarDest->calpstr.pElems = CoTaskMemAlloc( cElems * sizeof(*lppropvarDest->calpstr.pElems) ); if (lppropvarDest->calpstr.pElems == NULL) { AssertSz(0,TEXT("Couldn't allocate memory for pElemsNew")); goto Exit; } // Fill this new buffer so we don't get confused in the error path. ZeroMemory(lppropvarDest->calpstr.pElems, cElems * sizeof(*lppropvarDest->calpstr.pElems)); lppropvarDest->calpstr.cElems = cElems; // Initialize the pointers for the first string to convert. lplpstrDest = &lppropvarDest->calpstr.pElems[ 0 ]; lpstrSource = lppropvarSource->calpstr.pElems[ 0 ]; } // if (lppropvar->vt & VT_VECTOR) else { // We're not a vector, initialize to the only string. cElems = 1; lplpstrDest = &lppropvarDest->pszVal; lpstrSource = lppropvarSource->pszVal; } // --------------------- // Convert the String(s) // --------------------- while (cElems) { if (fConvertToAnsi) { if (!FCoWStrToStr ((LPSTR*)lplpstrDest, (LPWSTR) lpstrSource, uCodePage)) { goto Exit; } } else { if (!FCoStrToWStr ((LPWSTR*) lplpstrDest, (LPSTR) lpstrSource, uCodePage)) { goto Exit; } } // Move on to the next entry, if there is one. if (--cElems) { ulIndex++; lplpstrDest = &lppropvarDest->calpstr.pElems[ ulIndex ]; lpstrSource = lppropvarSource->calpstr.pElems[ ulIndex ]; } // if (--cElems) } // while (cElems) // Switch the destination VT to VT_LPSTR (for ansi strings) or VT_LPWSTR // (for Unicode strings), preserving all other bits. lppropvarDest->vt = (lppropvarSource->vt & ~(VT_LPSTR|VT_LPWSTR)) | (fConvertToAnsi ? VT_LPSTR : VT_LPWSTR); // ---- // Exit // ---- fSuccess = TRUE; Exit: if (!fSuccess) PropVariantClear (lppropvarDest); return( fSuccess ); } // FPropVarConvertString