windows——程序结构概述

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程序结构概述

#include <windows.h>LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow){    static TCHAR szAppName[] = TEXT("HelloWin");    HWND hwnd;    MSG msg;    WNDCLASS wndclass;    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= szAppName;    if(!RegisterClass(&wndclass))    {        MessageBox(NULL, TEXT("This program requires Windows NT!"), szAppName, MB_ICONERROR);        return 0;    }    hwnd = CreateWindow(szAppName, // window class nameTEXT("The Hello Win Program"), // window caption        WS_OVERLAPPEDWINDOW, // window style        CW_USEDEFAULT,// initial x position        CW_USEDEFAULT,// initial y position        CW_USEDEFAULT,// initial x size        CW_USEDEFAULT,// initial y size        NULL, // parent window handle        NULL, // window menu handle        hInstance, // program instance handle        NULL); // creation parameters    ShowWindow(hwnd, iCmdShow);    UpdateWindow(hwnd);    while(GetMessage(&msg, NULL, 0, 0))    {        TranslateMessage(&msg);        DispatchMessage(&msg);    }    return msg.wParam;}LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){    HDC hdc;    PAINTSTRUCT ps;    RECT rect;    switch (message)    {    case WM_CREATE:        return 0;    case WM_PAINT:        hdc = BeginPaint(hwnd, &ps);        GetClientRect(hwnd, &rect);        DrawText(hdc, TEXT("Hello, Windows!"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);        EndPaint(hwnd, &ps);        return 0;    case WM_DESTROY:        PostQuitMessage(0);        return 0;    }    return DefWindowProc(hwnd, message, wParam, lParam);}

程序结构可拆分为以下几个步骤(部分)：

窗口类别：创建窗口类别(定义WNDCLASS对象)&注册窗口类别(RegisterClass)
窗口：创建窗口(CreateWindow)&显示窗口(ShowWindow)&更新窗口(UpdateWindow)
消息循环：获取消息(GetMessage)&转换消息(TranslateMessage)&分发消息(DispatchMessage)
窗口消息处理程序：处理各类窗口消息，WM_CREATE，WM_PAINT，WM_DESTROY等

windows程序的基本流程为：

注册窗口类别
建立窗口
显示窗口
消息循环
消息处理(窗口消息处理程序)

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