C# 传递图片给C++dll

最新推荐文章于 2023-12-11 12:00:58 发布

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最新推荐文章于 2023-12-11 12:00:58 发布 · 4.2k 阅读

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#c# #Opencv-C++

本文介绍如何在C#应用中通过DllImport调用C++动态链接库（DLL），将JPEG图片数据传递给C++的OpenCV处理函数进行处理。C++DLL中的函数接收字节数组及图片尺寸参数，C#代码加载图片并将其转换为字节数组进行传递。

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C++dll 源码：
void _startLedCheck(byte *ImageBuffer, int imageWedth, int imageHeight)
{
Mat src = cv::Mat(imageHeight, imageWedth, CV_8UC3, ImageBuffer);

}

C#源码：
[DllImport(“LedCheck.dll”, EntryPoint = “_startLedCheck”, CallingConvention = CallingConvention.Cdecl)]
static extern void _startLedCheck(byte[] ImageBuffer, int imageWedth, int imageHeight);

private void buttonLoadImage_Click(object sender, EventArgs e)
{
Bitmap bmp = (Bitmap)Image.FromFile(“1.jpg”);

        Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
        System.Drawing.Imaging.BitmapData bmpData =
        bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, bmp.PixelFormat);

        // Get the address of the first line.
        IntPtr ptr = bmpData.Scan0;

        // Declare an array to hold the bytes of the bitmap. 
        int bytes = Math.Abs(bmpData.Stride) * bmp.Height;
        byte[] rgbValues = new byte[bytes