(DataFlex) FTP Download Binary File to a Stream

Demonstrates how to FTP download a binary file to a Chilkat stream.

Note: This example requires Chilkat v9.5.0.67 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Handle hoFtp
    Boolean iSuccess
    Handle hoFac
    Variant vStreamObj
    Handle hoStreamObj
    Variant vT
    Handle hoT
    Variant vBd
    Handle hoBd
    String sTemp1
    Boolean bTemp1

    // This example assumes the Chilkat FTP2 API to have been previously unlocked.
    // See FTP2 Unlock Sample for sample code.

    Get Create (RefClass(cComChilkatFtp2)) To hoFtp
    If (Not(IsComObjectCreated(hoFtp))) Begin
        Send CreateComObject of hoFtp
    End

    Set ComHostname Of hoFtp To "www.my-ftp-server.com"
    Set ComUsername Of hoFtp To "mFtpLogin"
    Set ComPassword Of hoFtp To "myFtpPassword"
    Set ComAuthTls Of hoFtp To True
    Set ComPassive Of hoFtp To True

    // Connect and login to the FTP server using TLS.
    Get ComConnect Of hoFtp To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // We'll read the incoming data chunk-by-chunk and write to an output file.
    Get Create (RefClass(cComCkFileAccess)) To hoFac
    If (Not(IsComObjectCreated(hoFac))) Begin
        Send CreateComObject of hoFac
    End
    Get ComOpenForWrite Of hoFac "qa_output/penguins2.jpg" To iSuccess
    If (iSuccess <> True) Begin
        Get ComLastErrorText Of hoFac To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatStream)) To hoStreamObj
    If (Not(IsComObjectCreated(hoStreamObj))) Begin
        Send CreateComObject of hoStreamObj
    End

    // Create a task to do the FTP download.
    Get pvComObject of hoStreamObj to vStreamObj
    Get ComGetFileToStreamAsync Of hoFtp "penguins2.jpg" vStreamObj To vT
    If (IsComObject(vT)) Begin
        Get Create (RefClass(cComChilkatTask)) To hoT
        Set pvComObject Of hoT To vT
    End
    Get ComLastMethodSuccess Of hoFtp To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoFtp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Start the task in a background thread.
    Get ComRun Of t To iSuccess

    Get Create (RefClass(cComChilkatBinData)) To hoBd
    If (Not(IsComObjectCreated(hoBd))) Begin
        Send CreateComObject of hoBd
    End
    While ((ComEndOfStream(hoStreamObj)) <> True)
        // Get the next chunk of JPG bytes.
        Get pvComObject of hoBd to vBd
        Get ComReadBd Of hoStreamObj vBd To iSuccess
        // Do something with it..
        // In this simple example, we'll just write to the file.
        Get pvComObject of hoBd to vBd
        Get ComFileWriteBd Of hoFac vBd 0 0 To iSuccess
        // Clear for the next read.
        Get ComClear Of hoBd To iSuccess
    Loop

    Send ComFileClose To hoFac

    Send Destroy of t

    Showln "Success."


End_Procedure