Get path of executable

Question

I know this question has been asked before but I still haven\'t seen a satisfactory answer, or a definitive \"no, this cannot be done\", so I\'ll ask again!

All I wa

Answer 1

This was my solution in Windows. It is called like this:

std::wstring sResult = GetPathOfEXE(64);

Where 64 is the minimum size you think the path will be. GetPathOfEXE calls itself recursively, doubling the size of the buffer each time until it gets a big enough buffer to get the whole path without truncation.

std::wstring GetPathOfEXE(DWORD dwSize)
{
    WCHAR* pwcharFileNamePath;
    DWORD dwLastError;
    HRESULT hrError;
    std::wstring wsResult;
    DWORD dwCount;

    pwcharFileNamePath = new WCHAR[dwSize];

    dwCount = GetModuleFileNameW(
        NULL,
        pwcharFileNamePath,
        dwSize
    );

    dwLastError = GetLastError();

    if (ERROR_SUCCESS == dwLastError)
    {
        hrError = PathCchRemoveFileSpec(
            pwcharFileNamePath,
            dwCount
        );

        if (S_OK == hrError)
        {
            wsResult = pwcharFileNamePath;

            if (pwcharFileNamePath)
            {
                delete pwcharFileNamePath;
            }

            return wsResult;
        }
        else if(S_FALSE == hrError)
        {
            wsResult = pwcharFileNamePath;

            if (pwcharFileNamePath)
            {
                delete pwcharFileNamePath;
            }

            //there was nothing to truncate off the end of the path
            //returning something better than nothing in this case for the user
            return wsResult;
        }
        else
        {
            if (pwcharFileNamePath)
            {
                delete pwcharFileNamePath;
            }

            std::ostringstream oss;
            oss << "could not get file name and path of executing process. error truncating file name off path. last error : " << hrError;
            throw std::runtime_error(oss.str().c_str());
        }
    }
    else if (ERROR_INSUFFICIENT_BUFFER == dwLastError)
    {
        if (pwcharFileNamePath)
        {
            delete pwcharFileNamePath;
        }

        return GetPathOfEXE(
            dwSize * 2
        );
    }
    else
    {
        if (pwcharFileNamePath)
        {
            delete pwcharFileNamePath;
        }

        std::ostringstream oss;
        oss << "could not get file name and path of executing process. last error : " << dwLastError;
        throw std::runtime_error(oss.str().c_str());
    }
}