Windows API编程（一）完整的示范程序

##

#include <windows.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);//回调函数;
int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrev, LPSTR lpCmdLine, int nCmdShow)
{
    WNDCLASS wndclass;//窗口类;
    MSG msg;
    wndclass.style = CS_HREDRAW | CS_VREDRAW;
    wndclass.lpfnWndProc = WndProc;
    wndclass.cbClsExtra = 0;
    wndclass.cbWndExtra = 0;
    wndclass.hInstance = hInstance;
    wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    wndclass.lpszMenuName = NULL;
    wndclass.lpszClassName = L"Window窗口创建";  //窗口类名称

    if (!RegisterClass(&wndclass))//注册窗口;
    {
        MessageBox(NULL, L"创建失败", L"error", MB_OK);
        return false;
    }

    HWND hwnd = CreateWindow(    //创建窗口，返回句柄;
        L"Window窗口创建",  //1.窗口类名称
        L"window窗口创建",  //2.窗口标题
        WS_OVERLAPPEDWINDOW, //3.窗口风格
        CW_USEDEFAULT,  //4.窗口左上角相对于屏幕左上角的初始x坐标
        CW_USEDEFAULT,  //5.窗口左上角相对于屏幕左上角的初始y坐标
        CW_USEDEFAULT,  //6.窗口宽度
        CW_USEDEFAULT,  //7.窗口高度
        NULL,           //8.一个子窗口的父窗口的句柄，或隶属窗口的拥有者窗口的句柄，若没有拥有者窗口或者父窗口，置为NULL;
        NULL,           //9.选单句柄
        hInstance,      //10.创建窗口对象的应用程序的实例句柄
        NULL            //11.创建窗口的额外参数
        );

    ShowWindow(hwnd, nCmdShow);//显示窗口;
    UpdateWindow(hwnd);//更新窗口;

    while (GetMessage(&msg, NULL, 0, 0)) //消息循环;
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_PAINT:
        HDC hdc;
        PAINTSTRUCT ps;
        hdc = BeginPaint(hwnd, &ps);
        TextOut(hdc, 20, 20, L"Window OK!", 10);
        EndPaint(hwnd, &ps);
        return 0;
    case WM_DESTROY:
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, message, wParam, lParam);
}