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C#調(diào)用vc++ dll 傳遞參數(shù)的問題（Bitmap 轉(zhuǎn)換為 opencv mat ），保存后圖片不一樣。

vc++ 代碼

bool Recognize(Point_2F *arr,uchar* b) {Mat src=cv::Mat(415,770,CV_8UC3,b);/*for (int i=0;i<src.rows;i++) { memcpy(src.ptr(i),b+i*src.cols,src.cols); }*/ cv::imwrite("D:\\my_2_testfiles\\111_before.png",src);// 保存的照片和原來的照片不一樣而且大小也不一樣？}

C#代碼

[DllImport("rectanglepoints.dll", EntryPoint = "Recognize", CallingConvention = CallingConvention.Cdecl)]static extern byte Recognize(IntPtr arr, IntPtr b);

{ // Create a new bitmap.Bitmap bmp = new Bitmap("D:\\my_2_testfiles\\111.png");// Lock the bitmap's bits. 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 ptrImg = bmpData.Scan0; bool ret;ret = Convert.ToBoolean(Recognize(IntPtr.Zero, ptrImg)); // Unlock the bits.bmp.UnlockBits(bmpData);Console.Read();}

照片附加

原圖：

?

調(diào)用vc++ dll后保存的圖片

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C#Bitmap和C++ opencv Mat相互轉(zhuǎn)換 ?C#調(diào)用C++編譯成的dll，這個dll中包含Opencv個的Mat到c#的Bitmap轉(zhuǎn)換，具體代碼如下： ?C++部分： ?首先創(chuàng)建win32應(yīng)用程序，選擇類庫模板 ? ?DLL_APIuchar * _stdcall run1(char* filename, int&width, int&height, int&step) { ? IplImage* uu = cvLoadImage(filename); ? IplImage * dst1 = cvCreateImage(cvSize(uu->width, uu->height), 8, 1); cvCvtColor(uu, dst1, CV_RGB2GRAY); Matss = cvarrToMat(uu); ? uchar * data = new uchar[uu->width*uu->height * 3]; data = ss.data; ? width = ss.size().width; height = ss.size().height; step = ss.step; ?return data; } ?C#中調(diào)用這個dll ?[DllImport(@"E:\Files\BarcodeProject\Code\testCode\OpenCvAssemblies\Debug\OpenCvAssemblies.dll" )] ?publicstaticexternIntPtr run1(string a, outint width, outint height, outint step); ?至此完成C++ Mat到Bitmap的轉(zhuǎn)換 ?下面是Bitmap 到 Mat的轉(zhuǎn)換 C# 部分 ?publicstaticBitmapInfoGetImagePixel(Bitmap Source) { byte[] result; int step; ?intiWidth = Source.Width; intiHeight = Source.Height; ?Rectanglerect = newRectangle(0, 0, iWidth, iHeight); ?System.Drawing.Imaging.BitmapDatabmpData = Source.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite, Source.PixelFormat); IntPtriPtr = bmpData.Scan0; ?intiBytes = iWidth * iHeight * 3; //根據(jù)通道數(shù)進(jìn)行設(shè)置 byte[] PixelValues = newbyte[iBytes]; ? ?//int time = Environment.TickCount; ?System.Runtime.InteropServices.Marshal .Copy(iPtr, PixelValues, 0, iBytes); //time = Environment.TickCount - time; //Console.WriteLine(time.ToString() + "ms"); Source.UnlockBits(bmpData); step = bmpData.Stride; result = PixelValues; // return result; // step = 0; ?BitmapInfo bi = newBitmapInfo{ Result=result, Step=step }; return bi; } } ?///<summary> /// Bitmap信息類 ///</summary> ?publicclassBitmapInfo { ?publicbyte[] Result { get; ?set; } publicint Step { get; set; } ?} ?Step 是掃描的步長，這個很重要，如果這個步長不是原來的值，就會造成圖像偏移，從而造成失真。 ? ?C++部分 ?DLL_APIvoid_stdcallshow(uchar* data,intwidth,intheight,intstep) { Matimage(height,width, CV_8UC3,data,step); //image.data = data; imshow("Image",image); ? ?//Mat(int rows, int cols, int type, void* data, size_t step = AUTO_STEP); } ?C# 中調(diào)用方式 ?BitmapInfo bi = GetImagePixel(bitmap); ?show(bi.Result,bitmap.Width,bitmap.Height,bi.Step); ?至此完成他們的相互轉(zhuǎn)換

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