Windows hooks: wh_shell - C++ WinAPI - Ответ 8952702

#include <windows.h>
extern "C" __declspec(dllexport)
 LRESULT CALLBACK HookProcess( int nCode, WPARAM wParam, LPARAM lParam)
{   
    if( nCode == HSHELL_WINDOWDESTROYED)
   MessageBox( NULL, TEXT("Закрывается окно верхнего уровня"),NULL,MB_OK);
  return CallNextHookEx( NULL, nCode, wParam, lParam);  
}

#include <windows.h>
#include <tchar.h>
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
HINSTANCE HookInstance;
HOOKPROC HookProcess;
HHOOK hHook;
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
    TCHAR szAppName[] = TEXT(" ");
    HWND hwnd;
    MSG msg;
    WNDCLASSEX wndclass;
    wndclass.cbSize = sizeof(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;
    wndclass.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    RegisterClassEx(&wndclass);
    hwnd = CreateWindow(szAppName,TEXT(""), WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, CW_USEDEFAULT,  NULL, NULL, hInstance, NULL );
    ShowWindow(hwnd, iCmdShow);
    UpdateWindow(hwnd);
 
     HookInstance=LoadLibrary(TEXT("HookDll.dll"));
     HookProcess=(HOOKPROC)GetProcAddress(HookInstance,"_HookProcess@12");
     hHook=SetWindowsHookEx(WH_SHELL,HookProcess,HookInstance,0);   
    while(GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return msg.wParam;
    UnhookWindowsHookEx(hHook);
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    switch(iMsg)
    {
    case WM_CREATE :
        hdc = GetDC(hwnd);  
            ReleaseDC(hwnd, hdc);   
        return 0;
    case WM_PAINT :
        hdc = BeginPaint(hwnd, &ps);    
        TextOut(hdc, 50, 50,TEXT("Приложение запущено"),60);
        EndPaint(hwnd, &ps);
        return 0;   
    case WM_DESTROY :
        PostQuitMessage(0);
        return 0;
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}