使用WPD将文件复制到Windows Phone C#

我想通过MTP将至少一个文件复制到
Windows手机.

根据本教程,我可以连接到手机并将文件从手机复制到计算机:

WPD: Transferring Content

但是我无法以相反的方式复制文件(从计算机到手机).

这是我的代码:

IPortableDeviceContent content;
this._device.Content(out content);
IPortableDeviceValues values = GetRequiredPropertiesForContentType(fileName, parentObjectId);

PortableDeviceApiLib.IStream tempStream;
uint optimalTransferSizeBytes = 0;
content.CreateObjectWithPropertiesAndData(
     values,
     out tempStream,
     ref optimalTransferSizeBytes,
     null);

System.Runtime.InteropServices.ComTypes.IStream targetStream = (System.Runtime.InteropServices.ComTypes.IStream)tempStream;

try
{
    using (var sourceStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
    {
        var buffer = new byte[optimalTransferSizeBytes];
        int bytesRead;
        do
        {
            bytesRead = sourceStream.Read(buffer, 0, (int)optimalTransferSizeBytes);
            IntPtr pcbWritten = IntPtr.Zero;
            targetStream.Write(buffer, (int)optimalTransferSizeBytes, pcbWritten);
        } while (bytesRead > 0);

    }
    targetStream.Commit(0);
 }
 finally
 {
     Marshal.ReleaseComObject(tempStream);
 }

我在几个设备上测试了这段代码.它适用于普通的MP3播放器并假设教程是正确的,它也适用于Android手机.
但是使用两个不同的Windows手机运行此代码,我得到以下异常:

An unhandled exception of type 'System.Runtime.InteropServices.COMException' occurred in      PortableDevices.exe

Additional information: The data area passed to a system call is too small. (Exception from HRESULT: 0x8007007A)

在这一行:targetStream.Write(buffer,(int)optimalTransferSizeBytes,pcbWritten);

缓冲区大小为262144字节,而文件大小仅为75 KB.我希望有人知道如何解决这个问题.

问候
j0h4nn3s

最佳答案 我有同样的问题,结果是作者犯了一个简单的错误.您正在编写缓冲区的大小而不是您读取的字节数.

更换

targetStream.Write(buffer, (int)optimalTransferSizeBytes, pcbWritten);

通过

targetStream.Write(buffer, bytesRead, pcbWritten);
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