int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
UINT time_out = 3000; SetTimer(NULL, 0, time_out, (TIMERPROC)TimerHandler);
MSG message;
while(TRUE)
{
while (::PeekMessage(&message, NULL, 0, 0, PM_REMOVE))
{
::TranslateMessage(&message);
::DispatchMessage(&message);
}
}
return 0;}VOID CALLBACK TimerHandler( HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
printf("Hello World!\n"); }加入下面这段代码
while (::PeekMessage(&message, NULL, 0, 0, PM_REMOVE))
{
::TranslateMessage(&message);
::DispatchMessage(&message);
}
}
使settimer 起作用
但是这样占用CPU不是太多?
有没有别的办法?
还有这断代码什么意思?
{
UINT time_out = 3000; SetTimer(NULL, 0, time_out, (TIMERPROC)TimerHandler);
MSG message;
while(TRUE)
{
while (::PeekMessage(&message, NULL, 0, 0, PM_REMOVE))
{
::TranslateMessage(&message);
::DispatchMessage(&message);
}
}
return 0;}VOID CALLBACK TimerHandler( HWND hwnd, UINT uMsg, UINT_PTR idEvent, DWORD dwTime)
{
printf("Hello World!\n"); }加入下面这段代码
while (::PeekMessage(&message, NULL, 0, 0, PM_REMOVE))
{
::TranslateMessage(&message);
::DispatchMessage(&message);
}
}
使settimer 起作用
但是这样占用CPU不是太多?
有没有别的办法?
还有这断代码什么意思?
解决方案 »
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标准Windows程序应该都有,如果不循环,一个main跑一次就结束了,就无法收到定时消息了
[in] Specifies a nonzero timer identifier. 楼主定时器ID为0也行?
while (::GetMessage(&message, NULL, 0, 0))
就不占用CPU了代码就是一个通过Windows的消息机制来实现的简单定时器,每隔3秒打印一次
控制台的入口函数,win32的程序体
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);/* Make the class name into a global variable */
char szClassName[ ] = "WindowsApp";int WINAPI WinMain (HINSTANCE hThisInstance,
HINSTANCE hPrevInstance,
LPSTR lpszArgument,
int nFunsterStil){
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */ /* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX); /* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */
/* Use Windows's default color as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND; /* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0; /* The class is registered, let's create the program*/
hwnd = CreateWindowEx (
0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Windows App", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
); /* Make the window visible on the screen */
ShowWindow (hwnd, nFunsterStil); /* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0))
{
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
} /* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}
/* This function is called by the Windows function DispatchMessage() */LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_KEYDOWN:
MessageBox(NULL,"a","b",MB_OK);
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
} return 0;
}
while (::PeekMessage(&message, NULL, 0, 0, PM_REMOVE))
{
::TranslateMessage(&message);
::DispatchMessage(&message);
}
}
可以使程序不退出,且不阻塞窗口的消息循环