filedrop.cpp

#include <SFML/Window.hpp>
#include <iostream>
#include <Windows.h>

LONG_PTR originalsfmlcallback = 0x0;

LRESULT CALLBACK mycallback(HWND handle, UINT message, WPARAM wParam, LPARAM lParam)
{
    if(message == WM_DROPFILES)
    {
        HDROP hdrop = reinterpret_cast<HDROP>(wParam);
        POINT p;
        p.x = 0;
        p.y = 0;
        if(DragQueryPoint(hdrop, &p))
            std::printf("Point is %d, %d\n", p.x, p.y);
        else
            std::cout << "Failed to get point" << std::endl;

        const UINT filescount = DragQueryFile(hdrop, 0xFFFFFFFF, NULL, 0);
        for(UINT i = 0; i < filescount; ++i)
        {
            const UINT bufsize = DragQueryFile(hdrop, i, NULL, 0);
            std::wstring str;
            str.resize(bufsize + 1);
            if(DragQueryFile(hdrop, i, &str[0], bufsize + 1))
            {
                std::string stdstr;
                sf::Utf8::fromWide(str.begin(), str.end(), std::back_inserter(stdstr));
                std::cout << stdstr << std::endl;
            }
        }
        DragFinish(hdrop);
        std::cout << "-------------" << std::endl;
    }//if WM_DROPFILES
    return CallWindowProcW(reinterpret_cast<WNDPROC>(originalsfmlcallback), handle, message, wParam, lParam);
}

int main(int argc, char ** argv)
{
    sf::Window app(sf::VideoMode(640u, 480u), "Drag and Drop from USERLAND");
    HWND handle = app.getSystemHandle();

    DragAcceptFiles(handle, TRUE);
    originalsfmlcallback = SetWindowLongPtrW(handle, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(mycallback));

    while(app.isOpen())
    {
        sf::Event eve;
        while(app.pollEvent(eve))
        {
            if(eve.type == sf::Event::Closed)
                app.close();

        }//while app poll event eve
        app.display();
    }//while app is open
}