Untitled

#include <windows.h>

#ifndef VK_MEDIA_NEXT_TRACK
#define VK_MEDIA_NEXT_TRACK 0xB0
#endif
#ifndef VK_MEDIA_PREV_TRACK
#define VK_MEDIA_PREV_TRACK 0xB1
#endif
#ifndef VK_MEDIA_STOP
#define VK_MEDIA_STOP   0xB2
#endif
#ifndef VK_MEDIA_PLAY_PAUSE
#define VK_MEDIA_PLAY_PAUSE 0xB3
#endif

/**
 * 2011, zaak404@gmail.com
 */

HINSTANCE hInst;
TCHAR szTitle[] = "ATKMEDIA";
TCHAR szWindowClass[] = "ATKMEDIA";

ATOM MRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
//int main(int argc, char** argv)
//{
//  HINSTANCE hInstance = 0;
//    HINSTANCE hPrevInstance = 0;
//    LPTSTR    lpCmdLine = 0;
//    int       nCmdShow = SW_SHOWNORMAL;

    MSG msg;

    MRegisterClass(hInstance);

    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return (int) msg.wParam;
}

ATOM MRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style          = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra     = 0;
    wcex.cbWndExtra     = 0;
    wcex.hInstance      = hInstance;
    wcex.hIcon          = 0;//LoadIcon(hInstance, MAKEINTRESOURCE(IDI_APPLICATION));
    wcex.hCursor        = 0;
    wcex.hbrBackground  = 0;
    wcex.lpszMenuName   = 0;
    wcex.lpszClassName  = szWindowClass;
    wcex.hIconSm        = 0;//LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_APPLICATION));

    return RegisterClassEx(&wcex);
}

BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // Store instance handle in our global variable

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   //ShowWindow(hWnd, nCmdShow);
   //UpdateWindow(hWnd);

   return TRUE;
}

void RunProc(LPSTR path) {
    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    ZeroMemory( &si, sizeof(si) );
    si.cb = sizeof(si);
    ZeroMemory( &pi, sizeof(pi) );

    CreateProcess(NULL, path, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);

    WaitForSingleObject( pi.hProcess, INFINITE );
    CloseHandle( pi.hProcess );
    CloseHandle( pi.hThread );
}

#define ATKMEDIA_MESSAGE                  0x0917
#define ATKMEDIA_PLAY                     0x0002
#define ATKMEDIA_STOP                     0x0003
#define ATKMEDIA_PREV                     0x0005
#define ATKMEDIA_NEXT                     0x0004
#define ATKMEDIA_CALC                     0x002B

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    char proc[] = "calc.exe";
    int wmId, wmEvent;

    switch (message)
    {
    case WM_COMMAND:
        wmId    = LOWORD(wParam);
        wmEvent = HIWORD(wParam);

        switch (wmId)
        {
        case WM_CLOSE:
            DestroyWindow(hWnd);
            break;

        case ATKMEDIA_MESSAGE:

            switch(wmEvent)
            {
            case ATKMEDIA_PLAY:
                keybd_event(VK_MEDIA_PLAY_PAUSE, 0, 0, 0);
                break;
            case ATKMEDIA_STOP:
                keybd_event(VK_MEDIA_STOP, 0, 0, 0);
                break;
            case ATKMEDIA_NEXT:
                keybd_event(VK_MEDIA_NEXT_TRACK, 0, 0, 0);
                break;
            case ATKMEDIA_PREV:
                keybd_event(VK_MEDIA_PREV_TRACK, 0, 0, 0);
                break;
            case ATKMEDIA_CALC:
                RunProc(proc);
                break;
            }

        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}