DataFlex

Google Drive - Upload File

See more Google Drive Examples

This example demonstrates how to upload a file to Google Drive. The assumption is that the file can be loaded into memory and uploaded. It is also possible to stream large files to Google Drive, but the code required is a little more complex. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vGAuth
    Handle hoGAuth
    Handle hoRest
    Boolean iBAutoReconnect
    Handle hoJson
    String sFolderId
    Variant vParents
    Handle hoParents
    Variant vJpgBytes
    Handle hoJpgBytes
    String sJsonResponse
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    Move False To iSuccess

    Move True To iSuccess

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

    // This example uses a previously obtained access token having permission for the 
    // Google Drive scope. 
    // See Get Google Drive OAuth2 Access Token

    Get Create (RefClass(cComChilkatAuthGoogle)) To hoGAuth
    If (Not(IsComObjectCreated(hoGAuth))) Begin
        Send CreateComObject of hoGAuth
    End
    Set ComAccessToken Of hoGAuth To "GOOGLE_DRIVE_ACCESS_TOKEN"

    Get Create (RefClass(cComChilkatRest)) To hoRest
    If (Not(IsComObjectCreated(hoRest))) Begin
        Send CreateComObject of hoRest
    End

    // Connect using TLS.
    Move True To iBAutoReconnect
    Get ComConnect Of hoRest "www.googleapis.com" 443 True iBAutoReconnect To iSuccess

    // Provide the authentication credentials (i.e. the access token)
    Get pvComObject of hoGAuth to vGAuth
    Get ComSetAuthGoogle Of hoRest vGAuth To iSuccess

    // -------------------------------------------------------------------------
    // A multipart upload to Google Drive needs a multipart/related Content-Type
    Get ComAddHeader Of hoRest "Content-Type" "multipart/related" To iSuccess

    // Specify each part of the request.

    // The 1st part is JSON with information about the file.
    Set ComPartSelector Of hoRest To "1"
    Get ComAddHeader Of hoRest "Content-Type" "application/json; charset=UTF-8" To iSuccess

    // Construct the JSON that will contain the metadata about the file data to be uploaded...
    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComAppendString Of hoJson "name" "starfish.jpg" To iSuccess
    Get ComAppendString Of hoJson "description" "A picture of a starfish." To iSuccess
    Get ComAppendString Of hoJson "mimeType" "image/jpeg" To iSuccess

    // To place the file in a folder, we must add a parents[] array to the JSON
    // and add the folder ID.  
    // In a previous example (see Lookup Google Drive Folder ID
    // we showed how to find the folder ID for a folder in Google Drive.

    // Use the folder ID we already looked up..
    Move "1Fksv-TfA1ILii1YjXsNa1-rDu8Cdrg72" To sFolderId

    Get Create (RefClass(cComChilkatJsonArray)) To hoParents
    If (Not(IsComObjectCreated(hoParents))) Begin
        Send CreateComObject of hoParents
    End
    Get pvComObject of hoParents to vParents
    Get ComAppendArray2 Of hoJson "parents" vParents To iSuccess

    Get ComAddStringAt Of hoParents -1 sFolderId To iSuccess

    Get ComEmit Of hoJson To sTemp1
    Get ComSetMultipartBodyString Of hoRest sTemp1 To iSuccess

    // The 2nd part is the file content, which will contain the binary image data.
    Set ComPartSelector Of hoRest To "2"
    Get ComAddHeader Of hoRest "Content-Type" "image/jpeg" To iSuccess

    Get Create (RefClass(cComChilkatBinData)) To hoJpgBytes
    If (Not(IsComObjectCreated(hoJpgBytes))) Begin
        Send CreateComObject of hoJpgBytes
    End
    Get ComLoadFile Of hoJpgBytes "qa_data/jpg/starfish.jpg" To iSuccess

    // Add the data to our upload
    Get pvComObject of hoJpgBytes to vJpgBytes
    Get ComSetMultipartBodyBd Of hoRest vJpgBytes To iSuccess

    Get ComFullRequestMultipart Of hoRest "POST" "/upload/drive/v3/files?uploadType=multipart" To sJsonResponse
    Get ComLastMethodSuccess Of hoRest To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoRest To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // A successful response will have a status code equal to 200.
    Get ComResponseStatusCode Of hoRest To iTemp1
    If (iTemp1 <> 200) Begin
        Get ComResponseStatusCode Of hoRest To iTemp1
        Showln "response status code = " iTemp1
        Get ComResponseStatusText Of hoRest To sTemp1
        Showln "response status text = " sTemp1
        Get ComResponseHeader Of hoRest To sTemp1
        Showln "response header: " sTemp1
        Showln "response JSON: " sJsonResponse
        Procedure_Return
    End

    Get ComLoad Of hoJson sJsonResponse To iSuccess

    // Show the full JSON response.
    Set ComEmitCompact Of hoJson To False
    Get ComEmit Of hoJson To sTemp1
    Showln sTemp1

    // A successful response looks like this:
    // {
    //   "kind": "drive#file",
    //   "id": "0B53Q6OSTWYoldmJ0Z3ZqT2x5MFk",
    //   "name": "starfish.jpg",
    //   "mimeType": "image/jpeg"
    // }

    // Get the fileId:
    Get ComStringOf Of hoJson "id" To sTemp1
    Showln "fileId: " sTemp1


End_Procedure