BEEPER1 程序测试问题

付笑

BEEPER1 程序书上说移动窗口的时候 会停止发出嘟嘟声音，我测试的时候怎么不是这样啊

代码如下:

/*-----------------------------------------
BEEPER1.C -- Timer Demo Program No. 1
(c) Charles Petzold, 1998
-----------------------------------------*/

#include <windows.h>

#define ID_TIMER 1

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("Beeper1") ;
HWND hwnd ;
MSG msg ;
WNDCLASS 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 ;

if (!RegisterClass (&wndclass))
{
MessageBox (NULL, TEXT ("Program requires Windows NT!"), 
szAppName, MB_ICONERROR) ;
return 0 ;
}

hwnd = CreateWindow (szAppName, TEXT ("Beeper1 Timer Demo"),
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;

ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static BOOL fFlipFlop = FALSE ;
HBRUSH hBrush ;
HDC hdc ;
PAINTSTRUCT ps ;
RECT rc ;

switch (message)
{
case WM_CREATE:
SetTimer (hwnd, ID_TIMER, 1000, NULL) ;
return 0 ;

case WM_TIMER :
MessageBeep (MB_ICONASTERISK) ; 
fFlipFlop = !fFlipFlop ;
InvalidateRect (hwnd, NULL, FALSE) ;
return 0 ;

case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;

GetClientRect (hwnd, &rc) ;
hBrush = CreateSolidBrush (fFlipFlop ? RGB(255,0,0) : RGB(0,0,255)) ;
FillRect (hdc, &rc, hBrush) ;

EndPaint (hwnd, &ps) ;
DeleteObject (hBrush) ;
return 0 ;

case WM_DESTROY :
KillTimer (hwnd, ID_TIMER) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}

风のQ

...你确定这个代码是完整的？
这个代码的消息响应函数中，只处理了WM_CREATE， WM_PAINT, WM_DESTROY, WM_TIIME,四种消息
这四种消息都和窗口移动没关系. 你应该响应些和窗口移动相关的消息，比如WM_MOVING