Question

我有一个监控系统，我想在报警触发时保存来自摄像头的快照。我已经尝试了很多方法来做到这一点......而且一切正常。

string ImageName = @"E:\snapshot\pic" + imageid + ".jpg";
WebClient webclient = new WebClient();
webclient.Credentials = new NetworkCredential("admin", "pass");
Uri url = new Uri("http://" + ip + "/cgi-bin/cmd/encoder?SNAPSHOT");
webclient.DownloadFileAsync(url, ImageName);
webclient.Dispose();

来自凸轮的图像是（1280 * 1024）。我想裁剪图像得到（500 * 500）Pixel

private void button2_Click(object sender, EventArgs e)
    {
        string ImageFrom = @"c:\3.jpg";
        byte[] imageData = ReadFile(ImageFrom);
        byte[] data = CropPicture(imageData, 500, 500);
        SqlConnection cn = new SqlConnection("Data Source=.;Initial Catalog=test;Integrated Security=True");
        string qry = "insert into val (id,img) values (@OriginalPath, @ImageData)";
        SqlCommand SqlCom = new SqlCommand(qry, cn);
        SqlCom.Parameters.Add(new SqlParameter("@OriginalPath",(object)"123"));
        SqlCom.Parameters.Add(new SqlParameter("@ImageData", (object)data));
        cn.Open();
        SqlCom.ExecuteNonQuery();
    }
    byte[] ReadFile(string sPath)
    {
        byte[] data = null;
        FileInfo fInfo = new FileInfo(sPath);
        long numBytes = fInfo.Length;
        FileStream fStream = new FileStream(sPath, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fStream);
        data = br.ReadBytes((int)numBytes);
        return data;
    }
    public static byte[] CropPicture(byte[] imgFile, int targetW, int targetH)
    {
        Image imgPhoto = Image.FromStream(new MemoryStream(imgFile));
        int targetX = (imgPhoto.Width - targetW) / 2;
        int targetY = (imgPhoto.Height - targetH) / 2;
        Bitmap bmpPhoto = new Bitmap(targetW, targetH, PixelFormat.Format24bppRgb);
        bmpPhoto.SetResolution(80, 60);
        Graphics gfxPhoto = Graphics.FromImage(bmpPhoto);
        gfxPhoto.SmoothingMode = SmoothingMode.AntiAlias;
        gfxPhoto.InterpolationMode = InterpolationMode.HighQualityBicubic;
        gfxPhoto.PixelOffsetMode = PixelOffsetMode.HighQuality;
        gfxPhoto.DrawImage(imgPhoto, new Rectangle(0, 0, targetW, targetH), targetX, targetY, targetW, targetH, GraphicsUnit.Pixel);
        MemoryStream mm = new MemoryStream();
        bmpPhoto.Save(mm, System.Drawing.Imaging.ImageFormat.Jpeg);
        // Dispose of all the objects to prevent memory leaks
        imgPhoto.Dispose();
        bmpPhoto.Dispose();
        gfxPhoto.Dispose();
        return mm.GetBuffer();
    }

然后将其插入sql数据库我有一个代码来裁剪图像。我知道如何将图像插入到SQL数据库中但它都需要将图像作为pc中的文件读取。我流式传输图像然后保存然后得到它并裁剪它并将其插入数据库请任何人告诉我如何获取流而不需要保存它

Answer 1

你应该可以使用这样的东西......（未经测试）

Image img = Image.FromStream((new WebClient()).OpenRead("a"));

从IP cam流式传输时需要HELP.crop图像

1 个答案: