我的win32项目里面setfocus(hwnd)并不能将我自己写的窗口切换成焦点。请问是什么原因？

这是我的回调函数

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) {
   PAINTSTRUCT ps;
   HDC hdc;
   switch (message)
   {

   case WM_CREATE: {
       SetTimer(hwnd, TIME1, 8000, NULL);
       break;
   }
   case WM_TIMER: {
       MessageBox(hwnd, TEXT(""), TEXT("提示！"), MB_OK);
       SetFocus(hwnd);
   }
   case WM_PAINT: {
       hdc=BeginPaint(hwnd, &ps);

TextOut(hdc, 20, 10, TEXT("你好，艾灵！"), wcslen(TEXT("你好，艾灵！")));

       EndPaint(hwnd, &ps);
       break;
   }
   case WM_CLOSE: {
       break;
   }
   case WM_SYSCOMMAND: {
       break;
   }
   case WM_DESTROY: {
       PostQuitMessage(0);
       break; }
   }
   return DefWindowProc(hwnd, message, wParam, lParam);
}

apue第三版，例题敲在Ubuntu上面怎么无法运行它自带的函数？

cominglately

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