zul ajax使用线程池

功能说明: 使用线程池的定时器函数来实现一个用户在规定时间内不作出响应时能自动关闭的消息框。

当启动该程序时，它将全局变量g _ n S e c L e f t设置为1 0。这表示用户必须在规定时间内对消息框作出响应的秒数。然后调用C r e a t e Ti m e r Q u e u e Ti m e r函数，指令线程池每秒钟调用一次M s g B o x Ti m e o u t函数。

作为线程池使用的范例，同时代码可以修改后重用。
附有完整的工程和编译好的程序。


/******************************************************************************
Module: TimedMsgBox.cpp
Notices: Copyright (c) 2000 Jeffrey Richter
******************************************************************************/


#include "..\CmnHdr.h" /* See Appendix A. */
#include <tchar.h>


//////////////////////////////////////////////////////////////////////////////


// The caption of our message box
TCHAR g_szCaption[] = TEXT("Timed Message Box");


// How many seconds we'll display the message box
int g_nSecLeft = 0;


// This is STATIC window control ID for a message box
#define ID_MSGBOX_STATIC_TEXT 0x0000ffff


//////////////////////////////////////////////////////////////////////////////


VOID WINAPI MsgBoxTimeout(PVOID pvContext, BOOLEAN fTimeout) {

// NOTE: Due to a thread race condition, it is possible (but very unlikely)
// that the message box will not be created when we get here.
HWND hwnd = FindWindow(NULL, g_szCaption);

if (hwnd != NULL) {
// The window does exist; update the time remaining.
TCHAR sz[100];
wsprintf(sz, TEXT("You have %d seconds to respond"), g_nSecLeft--);
SetDlgItemText(hwnd, ID_MSGBOX_STATIC_TEXT, sz);

if (g_nSecLeft == 0) {
// The time is up; force the message box to exit.
EndDialog(hwnd, IDOK);
}
} else {

// The window does not exist yet; do nothing this time.
// We'll try again in another second.
}
}


//////////////////////////////////////////////////////////////////////////////


int WINAPI _tWinMain(HINSTANCE hinstExe, HINSTANCE, PTSTR pszCmdLine, int) {

chWindows9xNotAllowed();

// How many seconds we'll give the user to respond
g_nSecLeft = 10;

// Create a multishot 1 second timer that begins firing after 1 second.
HANDLE hTimerQTimer;
CreateTimerQueueTimer(&hTimerQTimer, NULL, MsgBoxTimeout, NULL,
1000, 1000, 0);

// Display the message box
MessageBox(NULL, TEXT("You have 10 seconds to respond"),
g_szCaption, MB_OK);

// Cancel the timer & delete the timer queue
DeleteTimerQueueTimer(NULL, hTimerQTimer, NULL);

// Let us know if the user responded or if we timed-out.
MessageBox(NULL,
(g_nSecLeft == 0) ? TEXT("Timeout") : TEXT("User responded"),
TEXT("Result"), MB_OK);

return(0);
}


//////////////////////////////// End of File /////////////////////////////////