动态链接库C++的Mat转入C#

 C++代码

extern "C" _declspec(dllexport) void Getmat(uchar *data,size_t &size)
{
	vectorbuf;
	Mat img = imread("D:\\1.jpg");//读入图片
	imencode(".bmp", img, buf);   //将Mat以BMP格式存入uchar的buf数组中
	size = buf.size();
	for each(uchar var in buf)    //将buf拷贝到C#的byte[]中
	{
		*data = var;
		data++;
	}
}

C#代码

[DllImport("mydll.dll")]
public static extern void Getmat(ref byte data,out ulong size);

public Form1()
        {
            InitializeComponent();
            byte[] imgdata = new byte[3200 * 2400 * 3];//存储图片的数组，必须大于等于图片分辨率
            ulong size = new ulong();
            Getmat(ref imgdata[0], out size);
            pictureBox1.Image = Image.FromStream(new MemoryStream(imgdata, 0, (int)size));
        }