ConvertStringToBSTR lost char

[sm_ch]

Dear friends:
I have some codes:

char szTemp[10000];//store E6 9D 8E E5 85 8B E5 8B A4 00 00

memset(szTemp, 0, sizeof(szTemp));
char szTemp1[10000];

*pVal = _com_util::ConvertStringToBSTR(szTemp);
strcpy(szTemp1, _com_util::ConvertBSTRToString(*pVal));
//szTemp1 store E6 9D 8E E5 85 8B E5 8B 00 00 00

so A4 is lost.

what's the problem?

I have tried several ways to convert and failed.

By the way I need to transfer szTemp to VB and found this problem.So I wrote this code to test the conversion.

thanks a lot

[VictorN]

Please, post an example that can be compiled and tested.

[sm_ch]

 
#include <comdef.h>         
#include <comutil.h>

#pragma comment(lib, "comsupp.lib")

void main()
{
	char szTemp[10000];//store E6 9D 8E E5 85 8B E5 8B A4 00 00

	_bstr_t bstr = "李克勤";
	memset(szTemp, 0, sizeof(szTemp));
	
	int iOutputLength = WideCharToMultiByte(CP_UTF8,0,bstr,-1,NULL,0,NULL,NULL);
	WideCharToMultiByte(CP_UTF8,0,bstr,-1,szTemp,iOutputLength,NULL,NULL);

	char szTemp1[10000];

	_bstr_t bstr1 = _com_util::ConvertStringToBSTR(szTemp);
	strcpy(szTemp1, _com_util::ConvertBSTRToString(bstr1));
//szTemp1 store E6 9D 8E E5 85 8B E5 8B 00 00 00

}

Thank you.

[VictorN]

Well your last code snippet has nothing to do with the first one.
And you are doing a serious mistake: the second parameter of WideCharToMultiByte
must be LPCWSTR , not a _bstr_t.
It should be:
bstr.operator const wchar_t*( )

Besides, it is still not clear how you "store E6 9D 8E E5 85 8B E5 8B A4 00 00" in the char szTemp[10000] variable after you call

memset(szTemp, 0, sizeof(szTemp));

[sm_ch]

Sorry for putting the comment in wrong place.

[CODE]

#include <comdef.h> // MFC core and standard components

#include <comutil.h>

#pragma comment(lib, "comsupp.lib")

void main()
{
char szTemp[10000];
_bstr_t bstr = "李克勤";
memset(szTemp, 0, sizeof(szTemp));

int iOutputLength = WideCharToMultiByte(CP_UTF8,0,bstr,-1,NULL,0,NULL,NULL);
WideCharToMultiByte(CP_UTF8,0,bstr,-1,szTemp,iOutputLength,NULL,NULL);//store E6 9D 8E E5 85 8B E5 8B A4 00 00，saw this with Memory

char szTemp1[10000];

_bstr_t bstr1 = _com_util::ConvertStringToBSTR(szTemp);
strcpy(szTemp1, _com_util::ConvertBSTRToString(bstr1));
//store E6 9D 8E E5 85 8B E5 8B A4 00 00，saw this with Memory
}
[CODE]

[VictorN]

See below in red ...

Sorry for putting the comment in wrong place.

#include <comdef.h>         // MFC core and standard components

#include <comutil.h>

#pragma comment(lib, "comsupp.lib")

void main()
{
	char szTemp[10000];
	_bstr_t bstr = "李克勤";
//-----------        what do these magic symbols mean?

	memset(szTemp, 0, sizeof(szTemp));
	
	int iOutputLength = WideCharToMultiByte(CP_UTF8,0,bstr,-1,NULL,0,NULL,NULL);
	WideCharToMultiByte(CP_UTF8,0,bstr,-1,szTemp,iOutputLength,NULL,NULL);//store E6 9D 8E E5 85 8B E5 8B A4 00 00，saw this with Memory

	char szTemp1[10000];

	_bstr_t bstr1 = _com_util::ConvertStringToBSTR(szTemp);
	strcpy(szTemp1, _com_util::ConvertBSTRToString(bstr1));
//store E6 9D 8E E5 85 8B E5 8B A4 00 00，saw this with Memory
//-------I don't see any difference! -  :confused: 

}