将UnmanagedMemoryStream转换为System.Drawing.Image

Question

我使用EDSK将内存流转换为图像，它在

处出现以下错误

  

错误：尝试读取或写入受保护的内存。这通常是一个   表明其他内存已损坏。

     

行：readStream.Read（outMessage，0，（int）streamLength）;

                unsafe
                {
                    uint streamLength;
                    if (Error == EDSDK.EDS_ERR_OK)
                    {

                        Error = EDSDK.EdsGetLength(streamRef, out streamLength);
                    if (Error == EDSDK.EDS_ERR_OK)
                    {
                        UnmanagedMemoryStream readStream = new UnmanagedMemoryStream((byte*)(void*)streamRef.ToPointer(), streamLength, streamLength, FileAccess.Read);
                        // Create a byte array to hold data from unmanaged memory.

                        byte[] outMessage = new byte[streamLength];

                        // Read from unmanaged memory to the byte array.
                        readStream.Read(outMessage, 0, (int)streamLength);

                        readStream.Close();

                        Image img = byteArrayToImage(outMessage);
                        img.Save("C:\\temp\\test.jpeg");

                    }
}