how to convert byte array to bitmap in c#

Question

is it possible to convert byte array to bitmap in c#
regards
ALGATES

Answer 1

To some extent that would seem to depend on the contents of the array.

 

One approach would be to wrap an instance of the MemoryStream class around the byte array and then create an instance of the Bitmap class by calling the Bitmap (Stream) constructor.

 

Answer 2

Another way exists.

Code Block

TypeConverter tc = TypeDescriptor.GetConverter(typeof(Bitmap));

Bitmap bitmap1 = (Bitmap)tc.ConvertFrom(byteArray);

Or,

Code Block

ImageConverter ic = new ImageConverter();

Image img = (Image)ic.ConvertFrom(byteArray);

Bitmap bitmap1 = new Bitmap(img);

 

Answer 3

The ImageConverter and TypeConverter internally both use streams.

Code Snippet

public static Bitmap BytesToBitmap(byte[] byteArray)
{

using (MemoryStream ms = new MemoryStream(byteArray))

{

Bitmap img = (Bitmap)Image.FromStream(ms);

return img;

}

}

Answer 4

I ran into a "generic error in GDI" exception. Turns out you need to keep the MemoryStream around if you do anything else with the Bitmap.

Answer 5

Yes, that requirement is documented:

Bitmap Constructor (Stream) (System.Drawing)

First sentence under Remarks:

"You must keep the stream open for the lifetime of the Bitmap."

Answer 6

Thank you. This was useful.

Answer 7

thanks))), it was really helpful

Answer 8

"is it possible to convert byte array to bitmap in c#"

It is if it contains an image or at least the pixels of a image.  Can you contruct a bitmap from the File created by writing the byte array to a file using WirteAllBytes?

Answer 9

so many thanks its work fine.

Answer 10

Yea but no windows forms question more for the C# forums

http://social.msdn.microsoft.com/Forums/vstudio/en-US/home?forum=csharpgeneral

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Success
Cor

Answer 11

Yes, it is possible to convert byte array to bitmap in c#.

public Bitmap CopyDataToBitmap(byte[] data)
{
  //Here create the Bitmap to the know height, width and format
  Bitmap bmp = new Bitmap( 352, 288, PixelFormat.Format24bppRgb);  

  //Create a BitmapData and Lock all pixels to be written 
  BitmapData bmpData = bmp.LockBits(
                       new Rectangle(0, 0, bmp.Width, bmp.Height),   
                       ImageLockMode.WriteOnly, bmp.PixelFormat);

  //Copy the data from the byte array into BitmapData.Scan0
  Marshal.Copy(data, 0, bmpData.Scan0, data.Length);

  //Unlock the pixels
  bmp.UnlockBits(bmpData);

  //Return the bitmap 
  return bmp;
}
This code snippet is working fine.
My Scenario is that: I have to read image/bitmap information from Memory Mapped file and need to display in UI as Bitmap.
I tried many approaches to display it , but I could not able to display as mentioned below:
1. MemoryStream ms = new MemoryStream(newPixelDataArray);            
   Bitmap bitmap = new Bitmap(ms);
2. MemoryStream ms = new MemoryStream(newPixelDataArray);
   ms.Seek(0, SeekOrigin.Begin);
   Bitmap bitmap = new Bitmap(ms);
3. MemoryStream ms = new MemoryStream(newPixelDataArray);
   ms.Position = 0;
   Bitmap bitmap = new Bitmap(ms);


4. // Create copy of byte array.
   byte[] newPixelDataArray = new byte[byteArray.Length];
   byteArray.CopyTo(newPixelDataArray, 0);
   Then performed bitmap creation.

5. Image.FromStream(MemoryStream) 
6. Image.FromHbitmap(IntPtr)
Each tries I was getting exception as:
1. 
System.ArgumentException was unhandled
  HResult=-2147024809
  Message=Parameter is not valid.
  Source=System.Drawing
2. 
System.ArgumentException was unhandled
  HResult=-2147024809
  Message=Parameter is not valid.
  Source=System.Drawing
Finally I have solved my problem by below mentioned link and also the same code also copied above.
Thanks to you providing nice answer.
For more details go through the below link: http://www.tek-tips.com/viewthread.cfm?qid=1264492

Answer 12

Thanks for Pitambar S's answer! I tried other answers, they don't work for me (Parameter is not valid), only this one works!