Windows编程模型

#include <windows.h>

//事件驱动编程模型
//一切都是窗口：窗口和句柄
//消息与消息队列

//最简单的应用程序必须包含两个函数
//WinMain
//WndProc

//窗口过程回调函数
//宏修饰符
LRESULT WINAPI WndProc(HWND, UINT, WPARAM, LPARAM);

//相当于int main(void)
//H是handler句柄
//Instamce实例
int WINAPI WinMain( HINSTANCE hInstance,
                    //实例句柄
                    HINSTANCE HprevInstance,
                    LPSTR lpszCmdLine,
                    int nCmdShow)
{
    //窗口句柄
    HWND hwnd;
    //MSG是消息类型
    MSG msg;
    //窗口类
    //typedef struct tagWNDCLASSW {
    //    UINT        style;
    //    WNDPROC     lpfnWndProc;
    //    int         cbClsExtra;
    //    int         cbWndExtra;
    //    HINSTANCE   hInstance;
    //    HICON       hIcon;
    //    HCURSOR     hCursor;
    //    HBRUSH      hbrBackground;
    //    LPCWSTR     lpszMenuName;
    //    LPCWSTR     lpszClassName;
    //} WNDCLASSW, *PWNDCLASSW, NEAR *NPWNDCLASSW, FAR *LPWNDCLASSW;
    //1.设计一个窗口类
    WNDCLASS wc;
    wc.style = 0;
    //告诉窗口类用哪个窗口过程回调
    wc.lpfnWndProc = WndProc;
    //窗口类额外信息
    wc.cbClsExtra = 0;
    //窗口句柄额外信息
    wc.cbWndExtra = 0;
    //窗口实例
    wc.hInstance = hInstance;
    //窗口图标
    wc.hIcon = LoadIcon(NULL, IDI_WINLOGO);
    //窗口鼠标类型
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    //画刷背景颜色
    wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    //窗口菜单
    wc.lpszMenuName = NULL;
    //窗口类名字
    wc.lpszClassName = TEXT("myWndClass");

    //2.注册窗口类
    RegisterClass(&wc);

    //3.创建窗口
    hwnd = CreateWindow(
        TEXT("myWndClass"),
        TEXT("窗口标题"),
        WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        CW_USEDEFAULT,
        NULL,//父窗口句柄
        NULL,//窗口菜单句柄
        hInstance,
        NULL);

    //4.显示和更新窗口
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);

    //5.消息循环
    while (GetMessage(&msg, NULL, 0, 0))
    {
        //主要是键盘的消息是扫描码要变换成ASCII码需要翻译
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}


LRESULT WINAPI WndProc(HWND hwnd,
                            UINT message, 
                            WPARAM wParam, 
                            LPARAM lParam)
{
    //窗口过程回调对各种消息进行处理
    switch (message)
    {
    case WM_PAINT:
        return 0;
    case WM_DESTROY:
        //销毁窗口
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}