Write Files to WPD device via MTP C#/VB.net

Question

I would like to write an application that will copy MP3 files to a SanDisk Sansa M240. The SanDisk doesn't have a drive letter and uses MTP for file transfer. I stumbled through the sample of connecting to the device at : http://blogs.msdn.com/dimeby8/archive/2006/09/27/774259.aspx

but once connected, I can't figure out how to actually copy files / create folders on the device.

I am very surprised that there aren't any .Net wrappers for this COM library.

Answer 1

It looks like dimeby8 posted some code that handles data transfers. Check other posts in his blog, especially:

Sending MTP commands through WPD part 1

Sending MTP commands through WPD part 2

Sending MTP commands through WPD part 3

Answer 2

To transfer files through MTP with c#:

1. Download this NuGet package: PortableDevices

2. Add references to these 4 COM libraries:

   • PortableDeviceClassExtension
   • PortableDeviceConnectApi
   • PortableDeviceTypes
   • PortableDeviceApi

3. Take the dll's under obj\Debug and put them into bin\Debug:

   • Interop.PortableDeviceClassExtension.dll
   • Interop.PortableDeviceConnectApiLib.dll
   • Interop.PortableDeviceTypesLib.dll
   • Interop.PortableDeviceApiLib.dll

---

Now you can use the following function to list all devices, although FriendlyName does not seem to be working (it returns an empty string):

    private IDictionary<string, string> GetDeviceIds()
    {
        var deviceIds = new Dictionary<string, string>();
        var devices = new PortableDeviceCollection();
        devices.Refresh();
        foreach (var device in devices)
        {
            device.Connect();
            deviceIds.Add(device.FriendlyName, device.DeviceId);
            Console.WriteLine(@"DeviceId: {0}, FriendlyName: {1}", device.DeviceId, device.FriendlyName);
            device.Disconnect();
        }
        return deviceIds;
    }

The next step is getting the contents from the device, which is done like so:

var contents = device.GetContents();