How to write byte[] to a Bitmap? 1

[bledazemi]

Hi everyone,

I am trying to write an array of bytes to a Bitmap. The array of bytes contains only the bitmap data (no header info, simply the pixels).

I know the PixelFormat and the size of the Bitmap and I have the data. What I want to know is how to put this data into the Bitmap.

Here is how am I trying to do this:

/// <summary>
/// function CopyDataToBitmap
/// Purpose: Given the pixel data return a bitmap of size [352,288] and with PixelFormat=24RGB 
/// </summary>
/// <param name="data">Byte array with pixel data</param>
public Bitmap CopyDataToBitmap(byte[] data)
{
  //I
  Bitmap bmp = new Bitmap( 352, 288, PixelFormat.Format24bppRgb);  

  //Here the code to put data array into Bitmap 
  //Unfortunatelly i dont know how :(  

  //Return the bitmap 
  return bmp;

}

I would appreciate any help or suggestions from you guys.

Thanks in advance

 

[SHelton]

using (System.IO.MemoryStream ms = new System.IO.MemoryStream(data))
{
	Bitmap bmp = new Bitmap(ms);
}

 

[bledazemi]

Thanks Shelton, I tried what you suggested but it did not work for me it generated the followin exception:

System.ArgumentException
Message="Parameter is not valid."
Source="System.Drawing"
StackTrace:
at System.Drawing.Bitmap..ctor(Stream stream)


I am guessing that this exception is perhaps due to the fact that the memory Data passed to the memory stream contains only the Bitmap pixel data and no bitmap header information.

 

[bledazemi]

Hi SHelton ,

I found the solution to my problem and now it works ok. Thank you for your help, it helped me on my investigation to the problem.


Here is how i did it:

/// <summary>
/// function CopyDataToBitmap
/// Purpose: Given the pixel data return a bitmap of size [352,288],PixelFormat=24RGB 
/// </summary>
/// <param name="data">Byte array with pixel data</param>
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;
}

Solution was based on instructions at :

http://www.binary-universe.net/index.php?language=e&pageName=faq/english/faq.html#bitmapFromStream

Once again thanks



"It is in our collective behaviour that we are most mysterious" Lewis Thomas