dotnetstep: June 2010

Sunday, June 20, 2010

Process Bitmap Faster In .NET

In .NET (C# or VB.net) you can process Bitmap pixel by pixel.

Here is the example of simple code. ( Use Example of Gray Scale)

System.Drawing.Image img = System.Drawing.Bitmap.FromFile(@"C:\Test.jpg");
Bitmap bmp = (Bitmap)img;
         for (int x = 0; x < bmp.Width; x++)
         {
             for (int y = 0; y < bmp.Height; y++)
             {
                Color c = bmp.GetPixel(x, y);
                int gray = (int)((c.R + c.G + c.B)/3);
                bmp.SetPixel(x,y,Color.FromArgb(gray,gray,gray));
             }
         }

Above code works fine but it takes to much time to process.In order to process Bitmap Image Faster “BitmapData” is powerful class in .NET. Here is the example of that class.

System.Drawing.Image img = System.Drawing.Bitmap.FromFile(@"C:\Test.jpg");
Bitmap bmp = (Bitmap)img;
System.Drawing.Imaging.BitmapData data = bmp.LockBits(new Rectangle() { X = 0, Y = 0, Width = bmp.Width, Height = bmp.Height }, System.Drawing.Imaging.ImageLockMode.ReadWrite, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
IntPtr ptr = data.Scan0;
int bytes =data.Stride * bmp.Height;
byte[] rgbValues = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);
int val = 0;
for (int counter = 0; counter < rgbValues.Length; counter += 3)
{
    val = rgbValues[counter + 0] + rgbValues[counter + 1] + rgbValues[counter + 2];
    rgbValues[counter+0] = (byte)(val/3);
    rgbValues[counter+1] = (byte)(val/3);
    rgbValues[counter+2] = (byte)(val/3);
}
System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);
bmp.UnlockBits(data);

This code works must faster than previous code. Test it with PictureBox Control and See the effect… :)

Translate content using Bing Service In ASP.net MVC

I used Translate Bing Service API in SharePoint Translate Web Part. Same API can be used with ASP.net MVC. Here i am writing small extension method for HtmlHelper.

public static class HtmlHelperExtention
    {
        public static string Tranlate(this System.Web.Mvc.HtmlHelper objHelper,string inputContent,string sourceLanguage,string targetLanguage)
        {
            string apikey = System.Configuration.ConfigurationManager.AppSettings["BingAPI"];
            Soap s = new Soap();
            string frenchoutputtext = s.Translate(apikey, inputContent, sourceLanguage, targetLanguage);
            return frenchoutputtext;
        }
    }

In View Of ASP.net MVC you should write this.

<body>
    <div>
    <%= Html.Tranlate("<div>This is Translation test.</div>","en","fr") %>
    </div>
</body>

Requirement:
1. Valid API key required.
2. Need to Add Proxy Class to user “Bing Translate Service”.

Hope this will help…….