调用了CreateDialog（），为何WndProc不响应？？

int PASCAL WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
  // TODO: Place code here.
static char szAppName[] = "DTMF";
HWND        hwnd;
MSG         msg;
WNDCLASS    wndclass;
char Str_Sys[200];
if (!hPrevInstance)
{
wndclass.style         = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc   = (WNDPROC)WndProc;
wndclass.cbClsExtra    = 0 ;
wndclass.cbWndExtra    = DLGWINDOWEXTRA;
wndclass.hInstance     = hInstance;
wndclass.hIcon         = LoadIcon (hInstance, "IDI_ICON1");
wndclass.hCursor       = LoadCursor (NULL, IDI_APPLICATION);
wndclass.hbrBackground = (HBRUSH)GetStockObject(LTGRAY_BRUSH);
wndclass.lpszMenuName  = NULL;
wndclass.lpszClassName = szAppName; ATOM a=RegisterClass (&wndclass);
} GetSystemDirectory(Str_Sys,200);
strcat(Str_Sys,"\\comctl32.dll");
hLib = LoadLibrary(Str_Sys);  hInst = hInstance;
就是这句：hwnd = CreateDialog(hInstance, "DTMF", 0, NULL); hGWnd=hwnd; ShowWindow (hwnd, nCmdShow);
UpdateWindow(hwnd); bLoadDriver=DtmfInitSystem();
if(!bLoadDriver) PostQuitMessage(0); SetTimer(hwnd,ID_TIME,100,(TIMERPROC)TimerProc); while (GetMessage(&msg, NULL, 0, 0)) 
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}

return msg.wParam;
}
VOID CALLBACK TimerProc(HWND hwnd,UINT uMsg,UINT idEvent,DWORD dwTime)
{ 
if(idEvent!=ID_TIME) return;
DtmfDoWork();
}LRESULT CALLBACK  WndProc (HWND hwnd, UINT message, UINT wParam, LONG lParam)
{
int i;
switch (message)
{
  case WM_DESTROY :
KillTimer(hwnd,ID_TIME);
if(bLoadDriver) DtmfExitSystem();
PostQuitMessage (0) ;
return 0 ;
break;
case WM_COMMAND:
if(LOWORD(wParam)==IDC_CLOSE)
{
KillTimer(hwnd,ID_TIME);
if(bLoadDriver) DtmfExitSystem();
PostQuitMessage(0);
}
else if(LOWORD(wParam)==IDC_HANGUP)
{
for (i = 0; i < TalLine; i++)
DtmfResetChannel(i);
}
else if(LOWORD(wParam)==IDC_DIAL)
DtmfDialOut();

return 0;
break;
default:
return DefWindowProc (hwnd, message, wParam, lParam) ;
break;
}
}
在调用CreateDialog函数后，为什么不进入WndProc 响应，结果是看得见窗口，但是整个程式几乎就没有反应？单击任何按钮都没反应？这是为什么？？谢谢各位啦