CODEWITHSUNDEEP
visual-c++
theAnonymous
theAnonymous

Reputation: 1804

how to get value from BSTR*

I have a BSTR*. how to get the value from the BSTR* to std::string so that I can print it to console?

BSTR* ptr;
HRESULT result = objPtr->GetValue(ptr);
//need to print to console the value

Upvotes: 0

Views: 2393

Answers (2)

Phil Brubaker
Phil Brubaker

Reputation: 1277

There are many ways to pull this off; here's a simple example making use of the _bstr_t Class to effect the conversion from BSTR* to std::string.

#include "stdafx.h"
#include <Windows.h>
#include <comutil.h>
#include <iostream>
#include <string>
#pragma comment(lib,"comsuppw.lib")

int _tmain(int argc, _TCHAR* argv[])
{
    const BSTR* const pbstr = new BSTR(::SysAllocString(L"Hello World"));

    if (pbstr)
    {
        const std::string stdstr(_bstr_t(*pbstr, true));

        std::cout << stdstr << std::endl;

        ::SysFreeString(*pbstr);
        delete pbstr;
    }

    return 0;
}

Upvotes: 1

Totonga
Totonga

Reputation: 4366

std::wcout << ptr;

should work because it is compatible to an wchar_t*. You can also construct a std::wstring of an BSTR that is no nullptr.

If you wish to create a std::string of it you can check outher questions like this one but be aware of the ideas of encoding. BSTR is encoded as UTF-16.

Upvotes: 1

Related Questions