Method BufWriteStr

DbSigs.cpp:223–300

Return true if we managed to write entire string including terminator without overrunning nMaxBytes

// Return true if we managed to write entire string including terminator
// without overrunning nMaxBytes
bool CDbSigs::BufWriteStr(PBYTE pBuf,CString strIn,unsigned nMaxBytes,bool bUni,unsigned &nOffsetBytes)
{
	ASSERT(pBuf);

	bool		bRet = false;
	char		chAsc;
	wchar_t		chUni;
	unsigned	nCharSz = ((bUni)?sizeof(wchar_t):sizeof(char));
	PBYTE		pBufBase;
	LPWSTR		pBufUni;
	LPSTR		pBufAsc;

	pBufBase = pBuf + nOffsetBytes;
	pBufUni = (LPWSTR)pBufBase;
	pBufAsc = (LPSTR)pBufBase;

#ifdef UNICODE
	// Create non-Unicode version of string
	// Ref: http://social.msdn.microsoft.com/Forums/vstudio/en-US/85f02321-de88-47d2-98c8-87daa839a98e/how-to-convert-cstring-to-const-char-?forum=vclanguage
	// Added constant specifier
	LPCSTR		pszNonUnicode;
	USES_CONVERSION;
	// Not specifying code page explicitly but assume content
	// should be ASCII. Default code page is probably Windows-1252.
	pszNonUnicode = CW2A( strIn.LockBuffer( ) );
	strIn.UnlockBuffer( );
#endif


	unsigned	nStrLen;
	unsigned	nChInd;
	nStrLen = strIn.GetLength();
	for (nChInd=0;(nChInd<nStrLen)&&(nOffsetBytes+nCharSz-1<nMaxBytes);nChInd++) {
		if (bUni) {
			// Normal handling for unicode
			chUni = strIn.GetAt(nChInd);
			pBufUni[nChInd] = chUni; 
		} else {

#ifdef UNICODE
			// To avoid Warning C4244: Conversion from 'wchar_t' to 'char' possible loss of data
			// We need to implement conversion here
			// Ref: http://stackoverflow.com/questions/4786292/converting-unicode-strings-and-vice-versa

			// Since we have compiled for unicode, the CString character fetch
			// will be unicode char. Therefore we need to use ANSI-converted form.
			chAsc = pszNonUnicode[nChInd];
#else
			// Since we have compiled for non-Unicode, the CString character fetch
			// will be single byte char
			chAsc = strIn.GetAt(nChInd);
#endif
			pBufAsc[nChInd] = chAsc; 
		}
		// Advance pointers
		nOffsetBytes += nCharSz;
	}