(Go) Upload Binary File from Memory

This example demonstrates how to upload a binary file from memory. It uploads the file to a subdirectory of our choosing.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    success := true

    // 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.

    gAuth := chilkat.NewAuthGoogle()
    gAuth.SetAccessToken("GOOGLE-DRIVE-ACCESS-TOKEN")

    rest := chilkat.NewRest()

    // Connect using TLS.
    bAutoReconnect := true
    success = rest.Connect("www.googleapis.com",443,true,bAutoReconnect)

    // Provide the authentication credentials (i.e. the access token)
    rest.SetAuthGoogle(gAuth)

    // -------------------------------------------------------------------------
    // A multipart upload to Google Drive needs a multipart/related Content-Type
    rest.AddHeader("Content-Type","multipart/related")

    // Specify each part of the request.

    // The 1st part is JSON with information about the file.
    rest.SetPartSelector("1")
    rest.AddHeader("Content-Type","application/json; charset=UTF-8")

    // Construct the JSON that will contain the metadata about the file data to be uploaded...
    json := chilkat.NewJsonObject()
    json.AppendString("name","hedgehogs.jpg")
    json.AppendString("description","A cute photo of two hedgehogs.")
    json.AppendString("mimeType","image/jpeg")

    // 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 Build Local Metadata Cache
    // we built a local cache to make it easy to lookup file IDs given a file path.
    // Let's find the file ID for the folder "testFolder/abc/123"
    gdCache := chilkat.NewCache()
    gdCache.SetLevel(0)
    gdCache.AddRoot("C:/ckCache/googleDrive")

    folderId := gdCache.FetchText("testFolder/abc/123")
    if gdCache.LastMethodSuccess() != true {
        fmt.Println("Filepath not found in cache.")
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        json.DisposeJsonObject()
        gdCache.DisposeCache()
        return
    }

    parents := json.AppendArray("parents")
    parents.AddStringAt(-1,*folderId)
    parents.DisposeJsonArray()

    rest.SetMultipartBodyString(*json.Emit())

    // The 2nd part is the file content, which will contain the binary image data.
    rest.SetPartSelector("2")
    rest.AddHeader("Content-Type","image/jpeg")

    fac := chilkat.NewFileAccess()
    var jpgBytes []byte
    // Read a JPG file from the local filesystem.
    jpgBytes = fac.ReadEntireFile("qa_data/jpg/hedgehogs.jpg")

    // Add the bytes to our upload
    rest.SetMultipartBodyBinary(jpgBytes)

    jsonResponse := rest.FullRequestMultipart("POST","/upload/drive/v3/files?uploadType=multipart")
    if rest.LastMethodSuccess() != true {
        fmt.Println(rest.LastErrorText())
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        json.DisposeJsonObject()
        gdCache.DisposeCache()
        fac.DisposeFileAccess()
        return
    }

    // A successful response will have a status code equal to 200.
    if rest.ResponseStatusCode() != 200 {
        fmt.Println("response status code = ", rest.ResponseStatusCode())
        fmt.Println("response status text = ", rest.ResponseStatusText())
        fmt.Println("response header: ", rest.ResponseHeader())
        fmt.Println("response JSON: ", *jsonResponse)
        gAuth.DisposeAuthGoogle()
        rest.DisposeRest()
        json.DisposeJsonObject()
        gdCache.DisposeCache()
        fac.DisposeFileAccess()
        return
    }

    // Show the JSON response.
    json.Load(*jsonResponse)

    // Show the full JSON response.
    json.SetEmitCompact(false)
    fmt.Println(*json.Emit())

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

    // Get the fileId:
    fmt.Println("fileId: ", *json.StringOf("id"))

    gAuth.DisposeAuthGoogle()
    rest.DisposeRest()
    json.DisposeJsonObject()
    gdCache.DisposeCache()
    fac.DisposeFileAccess()