Re: [Mingw-users] [mingw - C/C++] How to convert C string to BSTR?

[Devin S. <dev...@gm...>]

I use this code. It's from the VideoLAN project.

char *CStrFromBSTR(int codePage, BSTR bstr)
{
UINT len =3D SysStringLen(bstr);
if( len > 0 )
{
size_t mblen =3D WideCharToMultiByte(codePage,
0, bstr, len, NULL, 0, NULL, NULL);
if( mblen > 0 )
{
char *buffer =3D (char *)CoTaskMemAlloc(mblen+1);
ZeroMemory(buffer, mblen+1);
if( WideCharToMultiByte(codePage, 0, bstr, len, buffer, mblen, NULL, NULL) =
)
{
buffer[mblen] =3D '\0';
return buffer;
}
}
}
return NULL;
};

BSTR BSTRFromCStr(int codePage, const char *s)
{
int wideLen =3D MultiByteToWideChar(codePage, 0, s, -1, NULL, 0);
if( wideLen )
{
WCHAR* wideStr =3D (WCHAR*)CoTaskMemAlloc(wideLen*sizeof(WCHAR));
if( NULL !=3D wideStr )
{
BSTR bstr;

ZeroMemory(wideStr, wideLen*sizeof(WCHAR));
MultiByteToWideChar(codePage, 0, s, -1, wideStr, wideLen);
bstr =3D SysAllocString(wideStr);
free(wideStr);

return bstr;
}
}
return NULL;
};
and then in the code use them like this:
char *strzTest =3D CStrFromBSTR(CP_ACP, m_bstr);
// use strzTest
free(strzTest);
 or..
 BSTR bstrTest =3D BSTRFromCStr(CP_ACP, m_cstr);
// use bstrTest
SysFreeString(bstrTest);
 Switch out CP_ACP (ANSI Code Page) for something else if you wish.
 Good luck,
 Devin


 On 10/26/05, SourceForge.net <no...@so...> wrote:
>
>
> Read and respond to this message at:
> https://sourceforge.net/forum/message.php?msg_id=3D3400628
> By: gamblerzg
>
> I need to convert c string (char *) into BSTR. The usual way to do it is
> through
> a _bstr_t class, whcih is defined in comutil.h. However, MinGW does gives
> an
> endless list errors when I tinclude that header. Is there any solution to
> this
> problem? I have to have BSTR, because I work with Variants, but I really
> do
> not want to use MS Studio.
>
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