(DataFlex) Download a Zip from a URL and OpenBd. (No .zip file is created)

Demonstrates how to download a .zip from a URL, opens the Zip, and gets the contents of a file. No file is ever written.

Note: This example requires Chilkat v11.0.0 or greater.

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    Variant vBd
    Handle hoBd
    Handle hoZip
    Variant vEntry
    Handle hoEntry
    Integer iLineEndingBehavior
    String sXmlStr
    Handle hoSb
    String sTemp1
    Boolean bTemp1

    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(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Get Create (RefClass(cComChilkatBinData)) To hoBd
    If (Not(IsComObjectCreated(hoBd))) Begin
        Send CreateComObject of hoBd
    End

    // This URL is valid and can be tested...
    Get pvComObject of hoBd to vBd
    Get ComQuickGetBd Of hoHttp "http://chilkatdownload.com/example_data/hamlet.zip" vBd To iSuccess
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatZip)) To hoZip
    If (Not(IsComObjectCreated(hoZip))) Begin
        Send CreateComObject of hoZip
    End

    // Open the zip from the bytes contained in bd.
    Get pvComObject of hoBd to vBd
    Get ComOpenBd Of hoZip vBd To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the entry for the file we want..
    Get Create (RefClass(cComChilkatZipEntry)) To hoEntry
    If (Not(IsComObjectCreated(hoEntry))) Begin
        Send CreateComObject of hoEntry
    End
    Get pvComObject of hoEntry to vEntry
    Get ComEntryOf Of hoZip "hamlet.xml" vEntry To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoZip To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Convert all line endings to CRLF (if needed)
    Move 2 To iLineEndingBehavior
    Get ComUnzipToString Of hoEntry iLineEndingBehavior "utf-8" To sXmlStr
    Get ComLastMethodSuccess Of hoEntry To bTemp1
    If (bTemp1 <> True) Begin
        Get ComLastErrorText Of hoEntry To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The XML in this case is about 274K, so let's just examine the last 20 lines...
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSb
    If (Not(IsComObjectCreated(hoSb))) Begin
        Send CreateComObject of hoSb
    End
    Get ComAppend Of hoSb sXmlStr To iSuccess

    Get ComLastNLines Of hoSb 20 True To sTemp1
    Showln sTemp1


End_Procedure