#include <stdio.h>
#include <Windows.h>

#define Free(addr) if(addr != 0) free(addr); else MessageBox(0, "Invalid pointer!", 0, 0);

#define IDC_BUTTON1 101
#define IDC_BUTTON2 102

void function1()
{
    MessageBox(0, "Wykonalem function1", 0, 0);
}

void function2(int number)
{
    char * szBuffer = new char[100];
    sprintf(szBuffer, "Wykonalem function2, number = %i", number);
    MessageBox(0, szBuffer, 0, 0);
    Free(szBuffer);
}

LRESULT __stdcall WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam );

int __stdcall WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow )
{
    WNDCLASSEX wc;

    wc.cbSize = sizeof( WNDCLASSEX );
    wc.style = 0;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon( NULL, IDI_APPLICATION );
    wc.hCursor = LoadCursor( NULL, IDC_ARROW );
    wc.hbrBackground =( HBRUSH )( COLOR_WINDOW + 1 );
    wc.lpszMenuName = NULL;
    wc.lpszClassName = "win32_sample_game_hooking";
    wc.hIconSm = LoadIcon( NULL, IDI_APPLICATION );

    if( !RegisterClassEx( & wc ) )
        return 1;
    HWND hwnd = CreateWindowEx( WS_EX_CLIENTEDGE, "win32_sample_game_hooking", "Gra", WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL );

    if( hwnd == NULL )
    {
        return 1;
    }
    CreateWindowEx(0, "BUTTON", "przycisk1", WS_VISIBLE | WS_CHILD, 5, 5, 100, 50, hwnd, (HMENU)IDC_BUTTON1, hInstance, 0);
    CreateWindowEx(0, "BUTTON", "przycisk2", WS_VISIBLE | WS_CHILD, 105, 5, 100, 50, hwnd, (HMENU)IDC_BUTTON2, hInstance, 0);

    ShowWindow( hwnd, nCmdShow );
    UpdateWindow( hwnd );
    MSG Msg;
    while( GetMessage( & Msg, NULL, 0, 0 ) )
    {
        TranslateMessage( & Msg );
        DispatchMessage( & Msg );
    }
    return Msg.wParam;
}

LRESULT __stdcall WndProc( HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam )
{
    switch( msg )
    {
    case WM_COMMAND:
        {
            if(LOWORD(wParam) == IDC_BUTTON1)
            {
                function1();
            }
            else if(LOWORD(wParam) == IDC_BUTTON2)
            {
                function2((rand()%10));
            }
        }
        break;
    case WM_CLOSE:
        DestroyWindow( hwnd );
        break;

    case WM_DESTROY:
        PostQuitMessage( 0 );
        break;

        default:
        return DefWindowProc( hwnd, msg, wParam, lParam );
    }
    return 0;
}