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//+-------------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1994 - 1995.
//
// File: thunktxt.c
//
// Contents: Support routines to thunk API parameters ANSI <-> UNICODE
//
// Functions: ConvertStrings()
//
// History: 2-03-95 davepl Created
//
//--------------------------------------------------------------------------
#include <shellprv.h>
#pragma hdrstop
//+-------------------------------------------------------------------------
//
// Function: ConvertStrings
//
// Synopsis: Converts a series of XCHAR strings into TCHAR strings,
// packed as a series of pointers followed by a contiguous
// block of memory where the output strings are stored.
//
// Eg: ConvertStrings(4, "Hello", "", NULL, "World");
//
// Returns a pointer to a block of memory as follows:
//
// 4 bytes <address of L"Hello">
// 4 bytes <address of L"">
// 4 bytes NULL
// 4 bytes <address of L"World">
// 12 bytes L"Hello\0"
// 2 bytes L"\0"
// 12 bytes L"World\0"
// ---------------------------------------------------
// 42 bytes
//
// The strings may then be referenced as ThunkText.m_pStr[0],
// [1], [2], and [3], where [2] is a NULL pointer.
//
// When the caller is finished with the strings, the entire
// block should be freed via LocalAlloc().
//
// Arguments: [cCount] -- Number of strings passed, incl NULs
// [pszOriginalString] -- The strings to convert
// (... etc ...)
//
// Returns: Pointer to a ThunkText structure
//
// History: 2-03-95 davepl Created
//
// Notes: In UNICODE builds, converts ANSI to UNICODE. In ANSI
// builds, converts to UNICODE (if present).
//
//--------------------------------------------------------------------------
#ifdef UNICODE
ThunkText * ConvertStrings(UINT cCount, ...){ ThunkText * pThunkText = NULL; UINT cTmp; LPXSTR pXChar; UINT cchResult;
va_list vaListMarker;
//
// Byte count is size of fixed members plus cCount pointers. cbOffset
// is the offset at which we will begin dumping strings into the struct
//
UINT cbStructSize = SIZEOF(ThunkText) + (cCount - 1) * SIZEOF(LPTSTR); UINT cbOffset = cbStructSize;
//
// Scan the list of input strings, and add their lengths (in bytes, once
// converted to TCHARs, incl NUL) to the output structure size
//
cTmp = 0; va_start(vaListMarker, cCount); do { pXChar = va_arg(vaListMarker, LPXSTR); if (pXChar) { #ifdef UNICODE
cchResult = MultiByteToWideChar(CP_ACP, // code page
0, // flags
pXChar, // source XCHAR
-1, // assume NUL term
NULL, // no buffer yet, computing size
0 ); // no buffer yet, computing size
#else
cchResult = WideCharToMultiByte(CP_ACP, // code page
0, // flags
pXChar, // source XCHAR
-1, // assume NUL term
NULL, // no buffer yet, computing size
0, // no buffer yet, computing size
NULL, // default char
NULL); // &fDefUsed
#endif
//
// Even a NUL string returns a 1 character conversion, so 0 means
// the conversion failed. Cleanup and bail.
//
if (0 == cchResult) { SetLastError((DWORD)E_FAIL); return NULL; }
cbStructSize += cchResult * SIZEOF(TCHAR); } cTmp++; } while (cTmp < cCount);
//
// Allocate the output structure.
//
pThunkText = (ThunkText *) LocalAlloc(LMEM_FIXED, cbStructSize); if (NULL == pThunkText) { SetLastError((DWORD)E_OUTOFMEMORY); return NULL; }
//
// Convert each of the input strings into the allocated output
// buffer.
//
cTmp = 0; va_start(vaListMarker, cCount); do { INT cchResult; pXChar = va_arg(vaListMarker, LPXSTR); // grab next src XSTR
if (NULL == pXChar) { pThunkText->m_pStr[cTmp] = NULL; } else { pThunkText->m_pStr[cTmp] = (LPTSTR)(((LPBYTE)pThunkText) + cbOffset);
#ifdef UNICODE
cchResult = MultiByteToWideChar(CP_ACP, // code page
0, // flags
pXChar, // source XCHAR
-1, // assume NUL term
pThunkText->m_pStr[cTmp], //outbuf
(cbStructSize - cbOffset) / sizeof(WCHAR) ); //buflen
#else
cchResult = WideCharToMultiByte(CP_ACP, // code page
0, // flags
pXChar, // source XCHAR
-1, // assume NUL term
pThunkText->m_pStr[cTmp], //outbuf
(cbStructSize - cbOffset) / sizeof(CHAR), //buflen
NULL, // default char
NULL); // &fDefUsed
#endif
//
// Even a NUL string returns a 1 character conversion, so 0 means
// the conversion failed. Cleanup and bail.
//
if (0 == cchResult) { LocalFree(pThunkText); SetLastError((DWORD)E_FAIL); return NULL; }
cbOffset += cchResult * SIZEOF(TCHAR); } cTmp++; } while (cTmp < cCount);
return pThunkText;}
#endif // UNICODE
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