Problem converting a CComBSTR to LPCTSTR with CW2CT

[JC Gauthier]

I have a problem converting a CComBSTR to LPCTSTR with CW2CT. Eveything works fine until my CComBSTR gets around 64 caracters... then the result of the convertion is a long "corrupted" string: "îþîþîþîþîþîþîþîþîþîþîþîþîþîþîþ...." Please help me ! :(( ----- See comments between /* */ for more info -----

LRESULT CListBoxDlg::OnBnClickedBtngetselitems(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
LPCTSTR sTitle; // Message box title
int arrSelList[12]; // Message buffer
TCHAR pszBuf[128] = "";// Message buffer
int iMaxNum = 12; // Max number of selected items
LRESULT iSelCount = 0; // Total selected items in the list
LPCTSTR sMsg = 0; // Message to put in the message box
CComBSTR bsMessage; // Message accumulator

iSelCount = this->SendDlgItemMessage(IDC\_AVSCODES, LB\_GETSELITEMS, WPARAM(iMaxNum), LPARAM(arrSelList));

if (iSelCount != LB\_ERR) {

	bsMessage.Append("You have selected the fields: ");
	\_stprintf(pszBuf, "%li", arrSelList\[0\]);
	bsMessage.Append(pszBuf);

	for (int i = 1; i < iSelCount; i++) {

		bsMessage.Append(", ");
		\_stprintf(pszBuf, "%li", arrSelList\[i\]);
		bsMessage.Append(pszBuf);
	}
	bsMessage.Append(".");
	/\* The following line will fails if bsMessage.m\_str contains:
		"You have selected the fields: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11."
	   But will not fail if it bsMessage.m\_str contains:
		"You have selected the fields: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10."
		(4 caracter less) but long size is not suppose the cause problems
		with ATL 7.0 compared to ATL 3.0
	\*/
	sMsg = CW2CT(bsMessage.m\_str);
	/\*
	// The following two lines makes it work fine but USES\_CONVERSION is not supposed
	// to be needed with ATL 7.0
	USES\_CONVERSION;
	sMsg = W2CT(bsMessage.m\_str);\*/
	sTitle = \_T("Selected Items List");
	::MessageBox(this->m\_hWnd, sMsg, sTitle, MB\_OK);
}

return 0;

}

[soptest]

This is the problem:

TCHAR pszBuf[128] = "";// Message buffer

buffer size is for 64 wide char's soptest

[JC Gauthier]

:~ even with 1024 it doesn't work

TCHAR pszBuf[1024] = "";// Message buffer

maybe there is something else I need to do. =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= J.-C. Gauthier - http://www.grandmenhir.com/

[soptest]

Use thi9s code:

//------------------------//
// Convert BSTR to char * //
//------------------------//
inline char* ConvertBSTRToString(BSTR pSrc)
{
if(!pSrc) return NULL;

DWORD cb,cwch = ::SysStringLen(pSrc);//convert even embeded NULL

char \*szOut = NULL;

if(cb = ::WideCharToMultiByte(CP\_ACP, 0, pSrc, cwch + 1, NULL, 0, 0, 0))
{
	szOut = new char\[cb\];
	if(szOut)
	{
		szOut\[cb - 1\]  = '\\0';
		
		if(!::WideCharToMultiByte(CP\_ACP, 0, pSrc, cwch + 1, szOut, cb, 0, 0))
		{
			delete \[\]szOut;//clean up if failed;
			szOut = NULL;
		}
	}
}

return szOut;

};

soptest