(DataFlex) Initiate Resumable Upload Session

See more Google Cloud Storage Examples

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

For more information, see https://cloud.google.com/storage/docs/performing-resumable-uploads

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    Handle hoJsonToken
    Variant vJsonMetaData
    Handle hoJsonMetaData
    String sUrl
    Variant vResp
    Handle hoResp
    Integer iStatusCode
    String sSessionUrl
    String sTemp1

    Move False To iSuccess

    // This example assumes 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(cComChilkatJsonObject)) To hoJsonToken
    If (Not(IsComObjectCreated(hoJsonToken))) Begin
        Send CreateComObject of hoJsonToken
    End
    Get ComLoadFile Of hoJsonToken "qa_data/tokens/googleCloudStorage.json" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoJsonToken To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonMetaData
    If (Not(IsComObjectCreated(hoJsonMetaData))) Begin
        Send CreateComObject of hoJsonMetaData
    End
    Get ComUpdateString Of hoJsonMetaData "contentType" "image/jpeg" To iSuccess

    // Adds the "Authorization: Bearer <access_token>" header..
    Get ComStringOf Of hoJsonToken "access_token" To sTemp1
    Set ComAuthToken Of hoHttp To sTemp1

    Get ComSetUrlVar Of hoHttp "bucket_name" "chilkat-bucket-b" To iSuccess
    Get ComSetUrlVar Of hoHttp "object_name" "penguins2.jpg" To iSuccess
    Move "https://storage.googleapis.com/upload/storage/v1/b/{$bucket_name}/o?uploadType=resumable&name={$object_name}" To sUrl
    Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
    If (Not(IsComObjectCreated(hoResp))) Begin
        Send CreateComObject of hoResp
    End
    Get pvComObject of hoJsonMetaData to vJsonMetaData
    Get pvComObject of hoResp to vResp
    Get ComHttpJson Of hoHttp "POST" sUrl vJsonMetaData "application/json" vResp To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStatusCode Of hoResp To iStatusCode
    Showln "response status code = " iStatusCode

    Move "" To sSessionUrl

    If (iStatusCode <> 200) Begin
        Get ComBodyStr Of hoResp To sTemp1
        Showln sTemp1
    End
    Else Begin
        // The session URL will be used to upload the file in chunks, in subsequent HTTP POSTs...
        Get ComGetHeaderField Of hoResp "Location" To sSessionUrl
        Showln "Session URL = " sSessionUrl
    End



End_Procedure