Konwersja VARIANT na String

#include <windows.h>
#include <stdio.h>
#include <string>

using namespace std;

int main()
{
	VARIANT v;
	VariantInit(&v);
	VariantClear(&v);
	
	printf("%s", (string)v);
}

#include <windows.h>
#include <stdio.h>
#include <string>
#include <comutil.h>
#include <comdef.h>

using namespace std;

int main()
{
	VARIANT v;
	string vr;
	VariantInit(&v);
	VariantClear(&v);
	
	printf("%s", ((LPCSTR)((_bstr_t)v)));
}

{
	VARIANT v;
	string vr;
	VariantInit(&v);
	vr = (char*)(_bstr_t)v;
	VariantClear(&v);

	printf("%s", vr.c_str());
} 

#include <windows.h>
#include <stdio.h>
#include <comutil.h>
#include <comdef.h>
#include <string>

using namespace std;

inline char* ConvertBSTRToString(BSTR pSrc) {
    if(!pSrc) return NULL;

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

    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;
};


int main(){
    VARIANT v;
    string vr;
    VariantInit(&v);
    VariantClear(&v);

	ConvertBSTRToString((_bstr_t)v);
}