HOOK SUR FENETRE (WIN32)

#include <windows.h>

HINSTANCE hinst;
HWND hmain, hed1, hed2, hed3;
HHOOK hhk = 0;
char szappname[] = "MsgHook";
char szEDIT[] = "EDIT";

// le HOOK LOCAL est ICI
LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam)
{
  MSG *lpmsg;
  lpmsg = (MSG*) lParam;
  if(nCode < 0) goto defRet; // NE JAMAIS TOUCHER DANS CE CAS
  if(lpmsg->message == WM_RBUTTONUP) {
    if(IsChild(hmain, lpmsg->hwnd)) SetWindowText(lpmsg->hwnd, "Y a un HOOK");
    else PostMessage(lpmsg->hwnd, WM_CLOSE, 0, 0);
    return 1;
  }
defRet:
  return (CallNextHookEx(hhk, nCode, wParam, lParam));
}

LRESULT CALLBACK AppWndProc(HWND hwnd, UINT mssg, WPARAM wParam, LPARAM lParam)
{
  switch(mssg) {
    case WM_CREATE:
      hed1 = CreateWindow(szEDIT, 0, WS_CHILD | WS_VISIBLE | WS_BORDER,
        10, 10, 300, 20, hwnd, (HMENU) 1000, hinst, 0);
      hed2 = CreateWindow(szEDIT, 0, WS_CHILD | WS_VISIBLE | WS_BORDER,
        10, 60, 300, 20, hwnd, (HMENU) 1001, hinst, 0);
      hed3 = CreateWindow(szEDIT, 0, WS_CHILD | WS_VISIBLE | WS_BORDER,
        10, 110, 300, 20, hwnd, (HMENU) 1002, hinst, 0);
      hhk = SetWindowsHookEx(WH_GETMESSAGE, GetMsgProc, 0, GetCurrentThreadId());
      return 0;
    case WM_SETFOCUS:
      SetFocus(hed1); return 0;
    case WM_DESTROY:
      if(hhk) UnhookWindowsHookEx(hhk);
      PostQuitMessage(0);
      return 0;
  }
  return DefWindowProc(hwnd, mssg, wParam, lParam);
}

DWORD InitInstance()
{
  WNDCLASSEX wndcls;
  RECT rct;
  memset(&wndcls, 0, sizeof(WNDCLASSEX));
  wndcls.cbSize = sizeof(WNDCLASSEX);
  wndcls.lpfnWndProc   = AppWndProc;
  wndcls.style         = CS_HREDRAW | CS_VREDRAW;
  wndcls.hInstance     = hinst;
  wndcls.lpszClassName = szappname;
  wndcls.hbrBackground = (HBRUSH) GetStockObject(GRAY_BRUSH);
  wndcls.hCursor       = LoadCursor(0, IDC_ARROW);
  if(!RegisterClassEx(&wndcls)) return 0;
  hmain = CreateWindowEx(0, szappname, szappname, WS_OVERLAPPEDWINDOW | WS_VISIBLE,
                        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
                        0, 0, hinst, 0);
  return (hmain != 0);
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, int)
{
  MSG msg;
  hinst = hInstance;
  if(!InitInstance()) return 0;
  ShowWindow(hmain, SW_NORMAL);
  while(GetMessage(&msg, NULL, 0, 0)) {
    TranslateMessage(&msg);
    DispatchMessage(&msg);
  }
  return 0;
}