[英]Not getting any Response from Named Pipe Server
I have created a NamedPipe inside a Windows Service and starting the Service Manually or as the System Starts up. 我已经在Windows服务中创建了一个NamedPipe并手动或在系统启动时启动了该服务。
EDIT: 编辑:
lpszPipename = TEXT("\\\\.\\pipe\\1stPipe");
OVERLAPPED m_OverLaped;
HANDLE hEvent;
hPipe=CreateNamedPipe (lpszPipename,
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED,
PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_NOWAIT,
PIPE_UNLIMITED_INSTANCES,BUFSIZE,
BUFSIZE,0,NULL);
m_OverLaped.hEvent=CreateEvent(NULL,TRUE,TRUE,NULL);
m_OverLaped.Internal=0;
m_OverLaped.InternalHigh=0;
m_OverLaped.Offset=0;
m_OverLaped.OffsetHigh=0;
ConnectNamedPipe(hPipe,&m_OverLaped);
Now I want to Access the Named Pipe, Write some Message and Response back. 现在,我要访问命名管道,写一些消息和响应。
LPTSTR lpszPipename = TEXT("\\\\.\\pipe\\1stPipe");
OVERLAPPED m_OverLaped;
m_OverLaped.hEvent=CreateEvent(NULL,TRUE,TRUE,NULL);
m_OverLaped.Internal=0;
m_OverLaped.InternalHigh=0;
m_OverLaped.Offset=0;
m_OverLaped.OffsetHigh=0;
hPipe=CreateFile (lpszPipename, // Gets the Pipename
GENERIC_READ | GENERIC_WRITE,// Client only writes to this pipe.
0, // Do not share this pipe with others.
NULL, // Do not inherit security.
OPEN_EXISTING, // Pipe must exist.
FILE_ATTRIBUTE_NORMAL, // I have no special requirements on
//file attributes
NULL);
dwMode = PIPE_READMODE_MESSAGE;
fSuccess = SetNamedPipeHandleState (hPipe, // pipe handle
&dwMode, // new pipe mode
NULL, // don't set maximum bytes
NULL); // don't set maximum time
fSuccess = TransactNamedPipe (hPipe, // pipe handle
lpszWrite, // message to server
(lstrlen(lpszWrite)+1)*sizeof(TCHAR),//message length
chReadBuf, // buffer to receive reply
BUFSIZE*sizeof(TCHAR), // size of read buffer
&cbRead, // bytes read
&m_OverLaped);
fSuccess = ReadFile (hPipe, // pipe handle
chReadBuf, // buffer to receive reply
BUFSIZE*sizeof(TCHAR), // size of buffer
&cbRead, // number of bytes read
&m_OverLaped); // overlapped
I have ommited the Error Checking Codes to be make it readable here. 我已省略了错误检查代码,以使其在此处易于阅读。 I get stuck for long(infinite may be ) time while executing
TransactNamedPipe
. 我在执行
TransactNamedPipe
时卡住了很长时间(可能无限)。 I must be setting some parameters wrong , but I have tried the options as specified at MSDN. 我必须将某些参数设置为错误,但是我尝试了MSDN中指定的选项。
m_OverLaped.hEvent = CreateEvent(NULL,TRUE,FALSE,NULL); ... ConnectNamedPipe(hPipe, &m_OverLaped);
Since the pipe is created with FILE_FLAG_OVERLAPPED flag, you must pass LPOVERLAPPED parameter to every pipe I/O call (including TransactNamedPipe). 由于管道是使用FILE_FLAG_OVERLAPPED标志创建的,因此必须将LPOVERLAPPED参数传递给每个管道I / O调用(包括TransactNamedPipe)。 If function returns FALSE and GetLastError returns ERROR_IO_PENDING, wait for m_OverLaped.hEvent - when it is set, operation is completed.
如果函数返回FALSE,而GetLastError返回ERROR_IO_PENDING,则等待m_OverLaped.hEvent-设置后,操作完成。
For starters 对于初学者
m_OverLaped.hEvent=hPipe;
Is wrong, hEvent needs to be set to the event you've created, not the pipe. 是错误的,需要将hEvent设置为您创建的事件,而不是管道。 Before you do the read you need to call:
阅读之前,您需要致电:
WaitForSingleObject( oOverlap.hEvent,
and then: 接着:
GetOverlappedResult()
Have you got the pipe working in non-overlapped mode? 您是否使管道在非重叠模式下工作?
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