C#学习教程:EmguCv TypeInitializationException由EmguCv.CV.CvInvoke引发分享


EmguCv TypeInitializationException由EmguCv.CV.CvInvoke引发

让我首先说我确实已经遵循了很多教程,例如整个位于EmguCv主站点上的教程,但是抛出了一个TypeInitializationException。

现在,仔细聆听,因为这里出现了非常奇怪的部分。 我首先要说的是我的问题有三个“级别”,然而,所有“级别”中的代码完全相同,即使没有任何变化。 这自然会指出我有一个引用或链接问题,但我再次尝试了不同的教程,但无济于事。

级别1(此级别产生TypeInitializationException)
我创建一个新项目,正确引用所有内容等,然后在这个新项目中编写我的代码。 在调试时,我抛出了exception,我的程序退出。 这是一个问题图片的链接: http : //prntscr.com/uychc

等级2(此等级完全正常,不会抛出任何exception)
在这个级别中,我几乎找到了EmguCv的一个示例项目(在本例中为VideoSurveilance),然后删除默认代码并将我的所有代码复制并粘贴到那里。 添加了我需要的更多参考文献后,程序运行正常。 我不能发布超过3个链接,但你必须相信我,video图片显示正确。

等级3(这个级别不会引发exception,但警告我一个人的“第一次机会”)
在这个级别中,我将整个Level 2项目复制并粘贴到另一个目录中。 找到并重新链接丢失的文件/引用后,我能够运行程序,但图片没有显示,我得到一个“类型的第一次机会exception”System.TypeInitializationException“发生在Emgu.CV.dll警告.http:/ /prntscr.com/uycmn

我目前运行Windows 7 x64(是的,我将构建选项更改为x64和x64 .dll)并运行EmguCv 2.4.9和2.4.2(在两者上测试)和Visual Studios 2010和2012(在两者上测试)。

这是它可能值得的代码:

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; //using System.Threading.Tasks; using System.Windows.Forms; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using Microsoft.Kinect; using Emgu.CV; using Emgu.CV.CvEnum; using Emgu.CV.Structure; using Emgu.CV.UI; using System.IO; namespace VideoSurveilance { public partial class VideoSurveilance : Form { KinectSensor sensor; WriteableBitmap depthBitmap; WriteableBitmap colorBitmap; DepthImagePixel[] depthPixels; byte[] colorPixels; int blobCount = 0; public VideoSurveilance() { InitializeComponent(); } private void VideoSurveilance_Load(object sender, System.EventArgs e) { foreach (var potentialSensor in KinectSensor.KinectSensors) { if (potentialSensor.Status == KinectStatus.Connected) { this.sensor = potentialSensor; break; } } if (null != this.sensor) { this.sensor.DepthStream.Enable(DepthImageFormat.Resolution640x480Fps30); this.sensor.ColorStream.Enable(ColorImageFormat.RgbResolution640x480Fps30); this.colorPixels = new byte[this.sensor.ColorStream.FramePixelDataLength]; this.depthPixels = new DepthImagePixel[this.sensor.DepthStream.FramePixelDataLength]; this.colorBitmap = new WriteableBitmap(this.sensor.ColorStream.FrameWidth, this.sensor.ColorStream.FrameHeight, 96.0, 96.0, PixelFormats.Bgr32, null); this.depthBitmap = new WriteableBitmap(this.sensor.DepthStream.FrameWidth, this.sensor.DepthStream.FrameHeight, 96.0, 96.0, PixelFormats.Bgr32, null); WriteableBitmap bitmap; bitmap = new WriteableBitmap(this.sensor.DepthStream.FrameWidth, this.sensor.DepthStream.FrameHeight, 96.0, 96.0, PixelFormats.Bgr32, null); byte[] retVal = new byte[bitmap.PixelWidth * bitmap.PixelHeight * 4]; bitmap.CopyPixels(new Int32Rect(0, 0, bitmap.PixelWidth, bitmap.PixelHeight), retVal, bitmap.PixelWidth * 4, 0); Bitmap b = new Bitmap(bitmap.PixelWidth, bitmap.PixelHeight); int k = 0; byte red, green, blue, alpha; for (int i = 0; i < bitmap.PixelWidth; i++) { for (int j = 0; j < bitmap.PixelHeight && k < retVal.Length; j++) { alpha = retVal[k++]; blue = retVal[k++]; green = retVal[k++]; red = retVal[k++]; System.Drawing.Color c = new System.Drawing.Color(); c = System.Drawing.Color.FromArgb(alpha, red, green, blue); b.SetPixel(i, j, c); } } Image temp = new Image(b); this.ibOriginal.Image = temp; this.sensor.AllFramesReady += this.sensor_AllFramesReady; try { this.sensor.Start(); } catch (IOException) { this.sensor = null; } } } private void sensor_AllFramesReady(object sender, AllFramesReadyEventArgs e) { blobCount = 0; BitmapSource depthBmp = null; Image openCVImg; using (ColorImageFrame colorFrame = e.OpenColorImageFrame()) { using (DepthImageFrame depthFrame = e.OpenDepthImageFrame()) { if (depthFrame != null) { blobCount = 0; if (colorFrame != null) { byte[] pixels = new byte[colorFrame.PixelDataLength]; colorFrame.CopyPixelDataTo(pixels); int stride = colorFrame.Width * 4; BitmapSource color = BitmapImage.Create(colorFrame.Width, colorFrame.Height, 96, 96, PixelFormats.Bgr32, null, pixels, stride); openCVImg = new Image(color.ToBitmap()); } else { return; } Image gray_image; using (MemStorage stor = new MemStorage()) { gray_image = openCVImg.InRange(new Bgr(0, 0, 150), new Bgr(200, 200, 255)); gray_image = gray_image.SmoothGaussian(9); CircleF[] circles = gray_image.HoughCircles(new Gray(100), new Gray(50), 2, gray_image.Height / 4, 10, 400)[0]; foreach (CircleF circle in circles) { CvInvoke.cvCircle(openCVImg, new System.Drawing.Point(Convert.ToInt32(circle.Center.X), Convert.ToInt32(circle.Center.Y)), 3, new MCvScalar(0, 255, 0), -1, LINE_TYPE.CV_AA, 0); openCVImg.Draw(circle, new Bgr(System.Drawing.Color.Red), 3); } } ibOriginal.Image = openCVImg; ibProcessed.Image = gray_image; } } } } } } using System; using System.Globalization; using System.IO; using System.Windows; using System.Windows.Media; using System.Windows.Media.Imaging; using Microsoft.Kinect; using System.ComponentModel; using System.Runtime.InteropServices; using Emgu.CV; namespace VideoSurveilance { public static class Helper { private const int MaxDepthDistance = 4000; private const int MinDepthDistance = 850; private const int MaxDepthDistanceOffset = 3150; public static BitmapSource SliceDepthImage(this DepthImageFrame image, int min = 20, int max = 1000) { int width = image.Width; int height = image.Height; //var depthFrame = image.Image.Bits; short[] rawDepthData = new short[image.PixelDataLength]; image.CopyPixelDataTo(rawDepthData); var pixels = new byte[height * width * 4]; const int BlueIndex = 0; const int GreenIndex = 1; const int RedIndex = 2; for (int depthIndex = 0, colorIndex = 0; depthIndex < rawDepthData.Length && colorIndex > DepthImageFrame.PlayerIndexBitmaskWidth; // Map the distance to an intesity that can be represented in RGB var intensity = CalculateIntensityFromDistance(depth); if (depth > min && depth  0) return (byte)(255 - (255 * newMax / (MaxDepthDistanceOffset))); else return (byte)255; } public static System.Drawing.Bitmap ToBitmap(this BitmapSource bitmapsource) { System.Drawing.Bitmap bitmap; using (var outStream = new MemoryStream()) { // from System.Media.BitmapImage to System.Drawing.Bitmap BitmapEncoder enc = new BmpBitmapEncoder(); enc.Frames.Add(BitmapFrame.Create(bitmapsource)); enc.Save(outStream); bitmap = new System.Drawing.Bitmap(outStream); return bitmap; } } [DllImport("gdi32")] private static extern int DeleteObject(IntPtr o); ///  /// Convert an IImage to a WPF BitmapSource. The result can be used in the Set Property of Image.Source ///  /// The Emgu CV Image /// The equivalent BitmapSource public static BitmapSource ToBitmapSource(IImage image) { using (System.Drawing.Bitmap source = image.Bitmap) { IntPtr ptr = source.GetHbitmap(); //obtain the Hbitmap BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap( ptr, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()); DeleteObject(ptr); //release the HBitmap return bs; } } } } 

我真诚地感谢那些甚至试图帮助我的人,并希望任何有类似问题的人都能从这个长期问题中受益。

找到’蛮力’解决方案:

你必须手动将“cvextern.dll”文件放入你的构建目录(x64,调试,发布或其他)。

这样做了。 我无法相信我花了一整天的时间试图解决这个问题。

正如Oliver所说,你的问题非常类似于: EmguCV TypeInitializationException由于无法以opencv_highgui220.dll访问某些dll而引发exception。 在CvInvoke中你会找到DLLImports,也许你应该插入一个断点并观察它的来源。

我想你已经从emgu网站上读到了这个

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