_com_util Namespace Reference

Functions
BSTR WINAPI	ConvertStringToBSTR (const char *pSrc)
char *WINAPI	ConvertBSTRToString (BSTR pSrc)

Function Documentation

ConvertBSTRToString()

char *WINAPI _com_util::ConvertBSTRToString

(

BSTR

pSrc

)

Definition at line 94 of file comsupp.cpp.

{
    DWORD cb, cwch;
    char *szOut = NULL;
 
    if (!pSrc) return NULL;
 
    /* Retrieve the size of the BSTR with the NULL terminator */
    cwch = ::SysStringLen(pSrc) + 1;
 
    /* Compute the needed size with the NULL terminator */
    cb = ::WideCharToMultiByte(CP_ACP, 0, pSrc, cwch, NULL, 0, NULL, NULL);
    if (cb == 0)
    {
        cwch = ::GetLastError();
        ::_com_issue_error(!IS_ERROR(cwch) ? HRESULT_FROM_WIN32(cwch) : cwch);
        return NULL;
    }
 
    /* Allocate the string */
    szOut = (char*)::operator new(cb * sizeof(char));
    if (!szOut)
    {
        ::_com_issue_error(HRESULT_FROM_WIN32(ERROR_OUTOFMEMORY));
        return NULL;
    }
 
    /* Convert the string and NULL-terminate */
    szOut[cb - 1] = '\0';
    if (::WideCharToMultiByte(CP_ACP, 0, pSrc, cwch, szOut, cb, NULL, NULL) == 0)
    {
        /* We failed, clean everything up */
        cwch = ::GetLastError();
 
        ::operator delete(szOut);
        szOut = NULL;
 
        ::_com_issue_error(!IS_ERROR(cwch) ? HRESULT_FROM_WIN32(cwch) : cwch);
    }
 
    return szOut;
}

ConvertStringToBSTR()

BSTR WINAPI _com_util::ConvertStringToBSTR

(

const char *

pSrc

)

Definition at line 60 of file comsupp.cpp.

{
    DWORD cwch;
    BSTR wsOut(NULL);
 
    if (!pSrc) return NULL;
 
    /* Compute the needed size with the NULL terminator */
    cwch = ::MultiByteToWideChar(CP_ACP, 0, pSrc, -1, NULL, 0);
    if (cwch == 0) return NULL;
 
    /* Allocate the BSTR (without the NULL terminator) */
    wsOut = ::SysAllocStringLen(NULL, cwch - 1);
    if (!wsOut)
    {
        ::_com_issue_error(HRESULT_FROM_WIN32(ERROR_OUTOFMEMORY));
        return NULL;
    }
 
    /* Convert the string */
    if (::MultiByteToWideChar(CP_ACP, 0, pSrc, -1, wsOut, cwch) == 0)
    {
        /* We failed, clean everything up */
        cwch = ::GetLastError();
 
        ::SysFreeString(wsOut);
        wsOut = NULL;
 
        ::_com_issue_error(!IS_ERROR(cwch) ? HRESULT_FROM_WIN32(cwch) : cwch);
    }
 
    return wsOut;
}