DataFlex

Parse Multipart Binary Http Response

See more HTTP Examples

This example demonstrates how to parse an HTTP response that is multipart and contains a binary file, such as a .zip or .pdf. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    Variant vReq
    Handle hoReq
    Variant vResp
    Handle hoResp
    Variant vResp
Body    Handle hoRespBody
    Handle hoMime
    Integer iNumParts
    Variant vPart0
    Handle hoPart0
    String sXmlStr
    Variant vPart1
    Handle hoPart1
    Variant vZipData
    Handle hoZipData
    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(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End
    Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
    If (Not(IsComObjectCreated(hoReq))) Begin
        Send CreateComObject of hoReq
    End

    // ...
    // Insert code here to construct some kind of HTTP request.
    // this example is to show how to parse a particular kind of response.
    // ...
    // ...

    // Send the request (whatever it may be in your case) to get the HTTP response object.
    Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
    If (Not(IsComObjectCreated(hoResp))) Begin
        Send CreateComObject of hoResp
    End
    Get pvComObject of hoReq to vReq
    Get pvComObject of hoResp to vResp
    Get ComHttpSReq Of hoHttp "www.somedomain.com" 443 True vReq vResp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // Get the response body (which is expected to be binary)
    Get Create (RefClass(cComChilkatBinData)) To hoRespBody
    If (Not(IsComObjectCreated(hoRespBody))) Begin
        Send CreateComObject of hoRespBody
    End
    Get pvComObject of hoRespBody to vRespBody
    Get ComGetBodyBd Of hoResp vRespBody To iSuccess

    // For this example, the response body contains something like this:

    // ------=_Part_21302_2029949381.1547401515443
    // Content-Type: application/xop+xml; charset=UTF-8; type="text/xml"
    // Content-Transfer-Encoding: 8bit
    // Content-ID: <rootpart@ws.jboss.org>
    // 
    // <env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'><env:Header></env:Header><env:Body>...</env:Body></env:Envelope>
    // ------=_Part_21302_2029949381.1547401515443
    // Content-Type: application/octet-stream
    // Content-Transfer-Encoding: binary
    // Content-Id: <fileArchivio-7d302908-4d64-43d3-bf4e-79ce806d43b3@ws.jboss.org>
    // 
    // BINARY_CONTENT_HERE...
    // 
    // ------=_Part_21302_2029949381.1547401515443--
    // 

    // Load it into a Chilkat MIME object.
    Get Create (RefClass(cComChilkatMime)) To hoMime
    If (Not(IsComObjectCreated(hoMime))) Begin
        Send CreateComObject of hoMime
    End
    Get pvComObject of hoRespBody to vRespBody
    Get ComLoadMimeBd Of hoMime vRespBody To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMime To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComNumParts Of hoMime To iNumParts
    If (iNumParts < 2) Begin
        Showln "Expected multipart MIME with at least 2 sub-parts."
        Procedure_Return
    End

    // Get the 1st sub-part, which is the XML.

    Get Create (RefClass(cComChilkatMime)) To hoPart0
    If (Not(IsComObjectCreated(hoPart0))) Begin
        Send CreateComObject of hoPart0
    End
    Get pvComObject of hoPart0 to vPart0
    Get ComPartAt Of hoMime 0 vPart0 To iSuccess

    // Should be OK because we checked NumParts above..
    Get ComGetBodyDecoded Of hoPart0 To sXmlStr
    Showln sXmlStr
    Showln "----"

    // Save the 2nd part to a file.  (It is a .zip file in our test case..)

    Get Create (RefClass(cComChilkatMime)) To hoPart1
    If (Not(IsComObjectCreated(hoPart1))) Begin
        Send CreateComObject of hoPart1
    End
    Get pvComObject of hoPart1 to vPart1
    Get ComPartAt Of hoMime 1 vPart1 To iSuccess

    Get ComSaveBody Of hoPart1 "qa_output/attachedZip.zip" To iSuccess

    // Alternatively, we could extract the binary data to a BinData and use elsewhere..
    Get Create (RefClass(cComChilkatBinData)) To hoZipData
    If (Not(IsComObjectCreated(hoZipData))) Begin
        Send CreateComObject of hoZipData
    End
    Get pvComObject of hoZipData to vZipData
    Get ComGetBodyBd Of hoPart1 vZipData To iSuccess
    Get ComWriteFile Of hoZipData "qa_output/attachedZip_again.zip" To iSuccess

    Showln "OK."


End_Procedure