这段代码为什么产生的文本会不断跳动？

[boytan]

/*------------------------------------------------------------
HELLOWIN.C -- Displays "Hello, Windows 98!" in client area
(c) Charles Petzold, 1998
------------------------------------------------------------*/
#include <windows.h>
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("HelloWin") ;
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 ("This program requires Windows NT!"),
szAppName, MB_ICONERROR) ;
return 0 ;
}
hwnd = CreateWindow (szAppName, // window class name
TEXT ("The Hello Program"), // window caption
WS_OVERLAPPEDWINDOW, // window style
CW_USEDEFAULT, // initial x position
CW_USEDEFAULT, // initial y position
CW_USEDEFAULT, // initial x size
CW_USEDEFAULT, // initial y size
NULL, // parent window handl
e
NULL, // window menu handle
hInstance, // program instance ha
ndle
NULL) ; // creation parameters

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 lPa
ram)
{
HDC hdc ;
PAINTSTRUCT ps ;
RECT rect ;
switch (message)

{
case WM_CREATE:
// PlaySound (TEXT ("hellowin.wav"), NULL, SND_FILENAME | SND_ASYNC
) ;
return 0 ;
case WM_PAINT:
hdc = GetDC (hwnd) ;
TextOut(hdc,0,0,TEXT("HELLO WORLD!"),12);
ReleaseDC(hwnd,hdc);
return 0 ;
case WM_DESTROY:
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}

[MSVCer]

mickeyx做的对，如不这样处理，重画消息不会被从输入队列中移出，始终导致重画
我没有什么SDK编程经验，差点误导人家子弟

[mickeyx]

MSVCer(家宝)是个严肃的人...

[mickeyx]

MSVCer(家宝)是个严肃的人...

[boytan]

好，谢谢，我这人说到做到一定给分，不过，请告诉我怎么给分呀？

[boytan]

知道了，已经给了

[MSVCer]

从代码上没看出来有文本跳动部分,检查显示器是否有接触不良或附近有人正使用手机通信,呵呵，说的什么啊，乱

[xuhuix2000]

没一点问题呀

[mickeyx]

...............
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc = BeginPaint(hWnd, &ps);
TextOut(hdc,0,0,TEXT("HELLO WORLD!"),12);
EndPaint(hWnd, &ps);
return(0);
}
..............

给分吧.