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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| kernel32.lib
| Header File
| winbase.h
| Unicode
| WinNT
| Platform Notes
| None
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WaitNamedPipe
The WaitNamedPipe function waits until either a time-out interval elapses or an instance of the
specified named pipe is available to be connected to (that is, the pipe's
server process has a pending ConnectNamedPipe operation on the pipe).
BOOL WaitNamedPipe(
LPCTSTR lpNamedPipeName,
| // address of name of pipe to wait for
| DWORD nTimeOut
| // time-out interval, in milliseconds
| );
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Parameters
lpNamedPipeName
Points to a null-terminated string that specifies the name of the named pipe.
The string must include the name of the computer on which the server process is
executing. A period may be used for the servername if the pipe is local. The following pipe name format is used:
\\servername\pipe\pipename
nTimeOut
Specifies the number of milliseconds that the function will wait for an
instance of the named pipe to be available. One of the following values can be used
instead of specifying a number of milliseconds:
Value
| Meaning
| NMPWAIT_USE_DEFAULT_WAIT
| The time-out interval is the default value specified by the server process in
the CreateNamedPipe function.
| NMPWAIT_WAIT_FOREVER
| The function does not return until an instance of the named pipe is available.
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Return Values
If an instance of the pipe is available before the time-out interval elapses,
the return value is nonzero.
If an instance of the pipe is not available before the time-out interval
elapses, the return value is zero. To get extended error information, call GetLastError.
Remarks
If no instances of the specified named pipe exist, the WaitNamedPipe function returns immediately, regardless of the time-out value.
If the function succeeds, the process should use the CreateFile function to open a handle to the named pipe. A return value of TRUE indicates
that there is at least one instance of the pipe available. A subsequent CreateFile call to the pipe can fail, because the instance was closed by the server or
opened by another client.
See Also
CallNamedPipe, ConnectNamedPipe, CreateFile, CreateNamedPipe
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