簡單窗口劫持

// 003.cpp : 定義應用程序的入口點。
//

#include "stdafx.h"
#include "003.h"

#define MAX_LOADSTRING 100

// 全局變量: 
HINSTANCE hInst;                                // 當前實例
TCHAR szTitle[MAX_LOADSTRING];                    // 標題欄文本
TCHAR szWindowClass[MAX_LOADSTRING];            // 主窗口類名

// 此代碼模塊中包含的函數的前向聲明: 
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);

typedef LRESULT(CALLBACK *PROCHEHE)(
    HWND hWnd,
    UINT message,
    WPARAM wParam,
    LPARAM lParam
    );

PROCHEHE g_OldProc = NULL;

//截獲回調函數
LRESULT CALLBACK ButtonProc(
    HWND hWnd,
    UINT message,
    WPARAM wParam,
    LPARAM lParam)
{

    switch (message){
    case  WM_LBUTTONDOWN:
        MessageBox(0, TEXT("劫持"), NULL, NULL);
        return 0;
        break;
    default:
        break;
    }

    return g_OldProc( hWnd,
         message,
         wParam,
         lParam);
}
    
    
    
    

int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPTSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);

     // TODO:  在此放置代碼。
    MSG msg;
    HACCEL hAccelTable;

    // 初始化全局字符串
    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
    LoadString(hInstance, IDC_MY003, szWindowClass, MAX_LOADSTRING);
    MyRegisterClass(hInstance);

    // 執行應用程序初始化: 
    if (!InitInstance (hInstance, nCmdShow))
    {
        return FALSE;
    }

    hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MY003));

    // 主消息循環: 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
        }
    }

    return (int) msg.wParam;
}



//
//  函數:  MyRegisterClass()
//
//  目的:  註冊窗口類。
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;

    wcex.cbSize = sizeof(WNDCLASSEX);

    wcex.style            = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc    = WndProc;
    wcex.cbClsExtra        = 0;
    wcex.cbWndExtra        = 0;
    wcex.hInstance        = hInstance;
    wcex.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MY003));
    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName    = MAKEINTRESOURCE(IDC_MY003);
    wcex.lpszClassName    = szWindowClass;
    wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

    return RegisterClassEx(&wcex);
}




//
//   函數:  InitInstance(HINSTANCE, int)
//
//   目的:  保存實例句柄並建立主窗口
//
//   註釋: 
//
//        在此函數中，咱們在全局變量中保存實例句柄並
//        建立和顯示主程序窗口。
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;

   hInst = hInstance; // 將實例句柄存儲在全局變量中

   hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

   if (!hWnd)
   {
      return FALSE;
   }

   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  函數:  WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  目的:    處理主窗口的消息。
//
//  WM_COMMAND    - 處理應用程序菜單
//  WM_PAINT    - 繪製主窗口
//  WM_DESTROY    - 發送退出消息並返回
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message)
    {
    case WM_CREATE:{
        CreateWindow(
            _T("button"),
            _T("快點我！"),
            WS_CHILD | WS_VISIBLE,
            0,0,56,30,
            hWnd,
            (HMENU)10001,
            hInst,
            NULL);
        //設置截獲窗口
        HWND h10001=GetDlgItem(hWnd, 10001);
        g_OldProc = (PROCHEHE)SetWindowLong(
            h10001,
            GWL_WNDPROC,
            (long)ButtonProc);
    }break;


    case WM_COMMAND:{
        wmId = LOWORD(wParam);
        wmEvent = HIWORD(wParam);
        // 分析菜單選擇: 
        switch (wmId)
        {

        case IDM_EXIT:
            DestroyWindow(hWnd);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
        }
    }break;


    case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        // TODO:  在此添加任意繪圖代碼...
        EndPaint(hWnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}