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[DllImport("libmtp.dll")]
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private static extern int LIBMTP_Get_Track_To_File (MtpDeviceHandle handle, uint trackId, string path, ProgressFunction callback, IntPtr data);
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[DllImport("libmtp.dll")]
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private static extern int LIBMTP_Send_Track_From_File (MtpDeviceHandle handle, string path, ref TrackStruct track, ProgressFunction callback, IntPtr data);
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private static extern int LIBMTP_Send_Track_From_File (MtpDeviceHandle handle, string path, ref TrackStruct track, ProgressFunction callback, IntPtr data, uint parentHandle);
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[DllImport("libmtp.dll")]
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private static extern int LIBMTP_Update_Track_Metadata (MtpDeviceHandle handle, ref TrackStruct metadata);