/*-----------------------------------------
BEEPER1.C -- Timer Demo Program No. 1
(c) Charles Petzold, 1998
-----------------------------------------*/#include <windows.h>
#include <conio.h>#define ID_TIMER 1LRESULT 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 ;
AllocConsole();
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)
{
switch (message)
{
case WM_CREATE:
SetTimer (hwnd, ID_TIMER, 100, NULL) ;
return 0 ; case WM_TIMER :
_cprintf("Processing WM_TIMER...\n");
MessageBeep (-1) ;
return 0 ;
//把下面的WM_PAINT消息处理代码注释掉后,程序就能正常响应并处理timer消息
//但是如果把注释拿掉就不能了,这到底是为什么呢?
/*case WM_PAINT :
return 0 ;*/
case WM_DESTROY :
KillTimer (hwnd, ID_TIMER) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}求高人指点。谢谢。
BEEPER1.C -- Timer Demo Program No. 1
(c) Charles Petzold, 1998
-----------------------------------------*/#include <windows.h>
#include <conio.h>#define ID_TIMER 1LRESULT 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 ;
AllocConsole();
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)
{
switch (message)
{
case WM_CREATE:
SetTimer (hwnd, ID_TIMER, 100, NULL) ;
return 0 ; case WM_TIMER :
_cprintf("Processing WM_TIMER...\n");
MessageBeep (-1) ;
return 0 ;
//把下面的WM_PAINT消息处理代码注释掉后,程序就能正常响应并处理timer消息
//但是如果把注释拿掉就不能了,这到底是为什么呢?
/*case WM_PAINT :
return 0 ;*/
case WM_DESTROY :
KillTimer (hwnd, ID_TIMER) ;
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, message, wParam, lParam) ;
}求高人指点。谢谢。
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{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
不停的在响应,造成处理不了其他消息?
BeginPaint(...);
EndPaint(...);
return 0 ;
LZ要搞清楚很多问题呀:
1、窗口绘制机制
2、DC
3、无效区域
4、BeginPaint 和 EndPaint
5、为什么在绘制函数中必须要用BeginPaint 和 EndPaint?如果用 GetDC()和ReleaseDC()会怎样?
5、为什么在绘制函数中必须要用BeginPaint 和 EndPaint?如果用 GetDC()和ReleaseDC()会怎样?
-------------------------------------------------------------------------------------是在WM_PAINT消息处理函数中.......