DataFlex

Socket Send and Receive BinData

Demonstrates the Chilkat Socket ReceiveBdN and SendBd methods. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoSock
    Boolean iUseTls
    Integer iPort
    Integer iMaxWaitMs
    Variant vBdToSend
    Handle hoBdToSend
    Integer i
    Integer iByteVal
    Variant vBdRecv
    Handle hoBdRecv
    String sTemp1

    Move False To iSuccess

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

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

    // --------------------------------------------------------------------
    // This example uses the public TCP echo service at https://tcpbin.com/
    // --------------------------------------------------------------------

    Move False To iUseTls
    Move 4242 To iPort
    Move 5000 To iMaxWaitMs
    Get ComConnect Of hoSock "tcpbin.com" iPort iUseTls iMaxWaitMs To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSock To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Wait a max of 2 seconds for a response..
    Set ComMaxReadIdleMs Of hoSock To 2000

    // Send 26 bytes contained in a Chilkat BinData
    Get Create (RefClass(cComChilkatBinData)) To hoBdToSend
    If (Not(IsComObjectCreated(hoBdToSend))) Begin
        Send CreateComObject of hoBdToSend
    End
    Move 0 To i
    Move 65 To iByteVal
    While (i < 26)
        Get ComAppendByte Of hoBdToSend iByteVal To iSuccess
        Move (iByteVal + 1) To iByteVal
        Move (i + 1) To i
    Loop

    // Send the contents of the BinData
    // Pass zero's in the 2nd and 3rd arguments to send the entire contents of the BinData.
    Get pvComObject of hoBdToSend to vBdToSend
    Get ComSendBd Of hoSock vBdToSend 0 0 To iSuccess

    // The tcpbin.com echo server only echoes after receiving an LF (linefeed char)
    Get ComSendByte Of hoSock 10 To iSuccess

    // The echo server will echo back whatever is sent to it.
    // We should be able to read the same bytes back..
    Get Create (RefClass(cComChilkatBinData)) To hoBdRecv
    If (Not(IsComObjectCreated(hoBdRecv))) Begin
        Send CreateComObject of hoBdRecv
    End
    // Receive the 26 bytes previously sent, plus the LF char.
    Get pvComObject of hoBdRecv to vBdRecv
    Get ComReceiveBdN Of hoSock 27 vBdRecv To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSock To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Show the contents of bdRecv in hex format
    Get ComGetEncoded Of hoBdRecv "hex" To sTemp1
    Showln sTemp1

    // Output:  4142434445464748494A4B4C4D4E4F505152535455565758595A0A


End_Procedure