Convertinng Ascii to CString not working in VC6.0, working fine VS2008

[mr.sam1024]

Hi!

The below code is working fine in VS2008 and not working in VC6.0 (taking garbage values)
this code is for converting hex values to string.

sending Input string is : 727332333263 required output: rs232c

DWORD AsciiToString(LPCTSTR f_chInputChar, LPTSTR f_chOutputChar)
{
long ch;
int i,j;
TCHAR tmp[2];

int len = _tcslen(f_chInputChar);
for(i = j= 0; i < len; i += 2, j++){
memset(tmp, NULL, 2);
tmp[0] = f_chInputChar[i];
tmp[1] = f_chInputChar[i+1];

ch = _tcstol(tmp, NULL, 16);
f_chOutputChar[j] = (TCHAR)ch;
}
return TRUE;
}

Please suggest the required changes.


Thanks in advance to all!

regards
sam.