Receive a 4-byte Length Prefix from a Socket

See more Socket/SSL/TLS Examples

Demonstrates Socket.ReceiveCount, which reads a four-byte length prefix as a signed 32-bit integer. A return value of -1 indicates failure.

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSocket
    Boolean iBTls
    Integer iMaxWaitMs
    Integer iMessageLength
    String sTemp1

    Move False To iSuccess

    Get Create (RefClass(cComChilkatSocket)) To hoSocket
    If (Not(IsComObjectCreated(hoSocket))) Begin
        Send CreateComObject of hoSocket
    End

    //  Connect to the server using TLS.
    Move True To iBTls
    Move 5000 To iMaxWaitMs
    Get ComConnect Of hoSocket "example.com" 5000 iBTls iMaxWaitMs To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSocket To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Read a four-byte length prefix as a signed 32-bit integer (network byte order by default).  A
    //  return value of -1 indicates failure.
    Get ComReceiveCount Of hoSocket To iMessageLength
    If (iMessageLength < 0) Begin
        Get ComLastErrorText Of hoSocket To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Showln "The peer will send " iMessageLength " bytes."


End_Procedure