Using Win32 functions in Visual FoxPro Image Gallery
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Using named pipes for interprocess communication

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Before you begin:
This code sample contains definitions of two classes, NamedPipeServer and NamedPipeClient, encapsulating named pipes API functionality.

The Pipes, as well as mailslots, can be used for transferring data between processes running on same computer or on different computers.

See also:
  • Peer-to-peer LAN messenger built with Mailslot API functions
  • Using mailslots to send messages on the network
  • Using WM_COPYDATA for interprocess communication
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    5512 bytes  
    Created: 2007-01-21 20:24:52  
    Modified: 2010-05-19 22:37:13  
    Visits in 7 days: 148  
    Listed functions:
    CloseHandle
    ConnectNamedPipe
    CreateFile
    CreateNamedPipe
    DisconnectNamedPipe
    FlushFileBuffers
    GetLastError
    ReadFile
    SetNamedPipeHandleState
    WriteFile
    Printer friendly API declarations
    My comment:
    Use the following code to run pipe server.

    LOCAL oServer As NamedPipeServer
    oServer = CREATEOBJECT("NamedPipeServer", "\\.\pipe\tpipe")
    WITH oServer
            IF NOT .Listen()
                    ? .errorcode, .errormsg
            ENDIF
    ENDWITH

    Starting the pipe server switches current VFP session to a waiting state. Thus it stays frozen until receiving a request from a pipe client.

    This is a sample client code.

    LOCAL oClient As NamedPipeClient
    oClient = CREATEOBJECT("NamedPipeClient", "\\.\pipe\tpipe")

    WITH oClient
            IF NOT .SendMessage(SYS(0))
                    ? .errorcode, .errormsg
            ENDIF
    ENDWITH

    Normally a pipe server application, written in programming language other than FoxPro, would create a separate threads for listening and for processing incoming requests.

    If the pipe client code runs on a different computer than the pipe server, in the pipe client code substitute the dot "." in the pipe name with the computer name or ip address of the pipe server.

    Pipe server accepts connections on TCP port 139 (NetBIOS).

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