| | | Win32程序设计之网络通信 | | 2001-05-31·
·QQ新人类编译··yesky
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结论
命名管道通常用在客户/服务器系统，这时服务器使用一个多线程的方式来同时处理多个连接。
列表1
该程序创建一个mailslot服务器并且从中进行读取
//***************************************************************
// From the book "Win32 System Services: The Heart of Windows NT"
// by Marshall Brain
// Published by Prentice Hall
file://
// This code implements a simple mailslot server (receiver) that
// uses polling.
file://***************************************************************
// sms_recv.cpp
#include
#include
int main()
{
char toDisptxt[80];
HANDLE hSMS_Slot;
DWORD nextSize;
DWORD Msgs;
DWORD NumBytesRead;
BOOL Status;
/* Create a mailslot for receiving messages */
hSMS_Slot=CreateMailslot("\\\\.\\mailslot\\sms",
0, 0, (LPSECURITY_ATTRIBUTES) NULL);
/* Check and see if the mailslot was created */
if (hSMS_Slot == INVALID_HANDLE_VALUE)
{
cerr << "ERROR: Unable to create mailslot "
<< GetLastError() << endl;
return (1);
}
/* Repeatedly check for messages until the
program is terminated */
while(1)
{
Status=GetMailslotInfo(hSMS_Slot,
(LPDWORD) NULL, &nextSize, &Msgs,
(LPDWORD) NULL);
if (!Status)
{
cerr << "ERROR: Unable to get status. "
<< GetLastError() << endl;
CloseHandle(hSMS_Slot);
return (1);
}
/* If messages are available, then get them */
if (Msgs)
{
/* Read the message and check to see if
read was successful */
if (!ReadFile(hSMS_Slot, toDisptxt, nextSize,
&NumBytesRead, (LPOVERLAPPED) NULL))
{
cerr
<< "ERROR: Unable to read from mailslot "
<< GetLastError() << endl;
CloseHandle(hSMS_Slot);
return (1);
}
/* Display the Message */
cout << toDisptxt << endl;
}
else
/* Check for new messages twice a second */
Sleep(500);
} /* while */
}
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