MFC（一）——Windows程序内部运行原理

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我是靠谱客的博主苗条煎饼，最近开发中收集的这篇文章主要介绍MFC（一）——Windows程序内部运行原理，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

消息结构体

typedef struct tagMSG{
    HWND hwnd;
    UINT message;
    WPARAM wParam;
    LPARAM lParam;
    DWORD time;
    POINT pt;
} MSG, *pMSG;

WinMain入口函数

int WINAPI WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPreInstance,
    LPSTR lpCmdLine,
    int nCmdShow
);

窗口的创建

设计一个窗口类
注册窗口类
创建窗口
显示及更新窗口

#include <windows.h>
#include <stdio.h>

LRESULT CALLBACK WinSumProc(
    HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
);

int WINAPI WinMain(
    HINSTANCE hInstance,
    HINSTANCE hPreInstance,
    LPSTR lpCmdLine,
    int nCmdShow
) {
    WNDCLASS wndcls;
    wndcls.cbClsExtra = 0;
    wndcls.cbWndExtra = 0;
    wndcls.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
    wndcls.hCursor = LoadCursor(NULL, IDC_CROSS);
    wndcls.hIcon = LoadIcon(NULL, IDI_ERROR);
    wndcls.hInstance = hInstance;
    wndcls.lpfnWndProc = WinSumProc;
    wndcls.lpszClassName = "Flaming";
    wndcls.lpszMenuName = NULL;
    wndcls.style = CS_HREDRAW | CS_VREDRAW;
    RegisterClass(&wndcls);

    HWND hwnd;
    hwnd = CreateWindow("Flaming", "Hello,World", WS_OVERLAPPEDWINDOW, 0, 0, 600, 400, NULL, NULL, hInstance, NULL);

    ShowWindow(hwnd, SW_SHOWNORMAL);
    UpdateWindow(hwnd);

    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0)) {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return 0;
}

LRESULT CALLBACK WinSumProc(
    HWND hwnd,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
) {
    switch (uMsg) {
    case WM_CHAR:
        char szChar[20];
        sprintf(szChar, "char is %d", wParam);
        MessageBox(hwnd, szChar, "Flaming", 0);
        break;
    case WM_LBUTTONDOWN:
        MessageBox(hwnd, "mouse clicked", "Flaming", 0);
        HDC hdc;
        hdc = GetDC(hwnd);
        TextOut(hdc, 0, 50, "Hello,world", strlen("Hello,world"));
        ReleaseDC(hwnd, hdc);
        break;
    case WM_PAINT:
        HDC hDC;
        PAINTSTRUCT ps;
        hDC = BeginPaint(hwnd, &ps);
        TextOut(hDC, 0, 0, "Hello!", strlen("Hello!"));
        EndPaint(hwnd, &ps);
        break;
    case WM_CLOSE:
        if (IDYES == MessageBox(hwnd, "是否真的结束?", "Flaming", MB_YESNO)) {
            DestroyWindow(hwnd);
        }
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hwnd, uMsg, wParam, lParam);
    }
    return 0;
}