基本画图

int main(int argc, char* argv[])
{
    //1.设备对象
    HWND hwnd;
    hwnd = NULL;//默认桌面画图

    //2.获取设备上下文
    HDC hdc = GetDC(hwnd);

    //3.创建画刷
    HBRUSH hBrush = (HBRUSH)GetStockObject(DC_BRUSH);//取系统默认的

    //4.关联画刷
    SelectObject(hdc,hBrush);

    //5.开始画图
    SetDCBrushColor(hdc,RGB(0xFF,0xFF,00));//设置画刷的颜色    
    Rectangle(hdc,0,0,400,400);

    //6.释放资源
    DeleteObject(hBrush);
    ReleaseDC(hwnd,hdc);
    
    
    printf("Hello World!\n");
    return 0;
}