Convert Byte Array to Bitmap Object in wpf

Question

I want to convert byte array to bitmap. I get this byte array from capture card. Rgb24 data include for this array. When i convert this array to bitmap object i got the "Parameter is not valid" error.

This is my byte array myByteArray{byte[921600]}

MemoryStream mStream = new MemoryStream(myByteArray);
Bitmap bi = new Bitmap(mStream );

and

using (MemoryStream mStream = new MemoryStream(myByteArray))
{
Bitmap bi = (Bitmap)System.Drawing.Image.FromStream(mStream );
}

and

using (MemoryStream mStream = new MemoryStream())
{
mStream.Write(myByteArray, 0, myByteArray.Length);
mStream.Seek(0, SeekOrigin.Begin);

Bitmap bm = new Bitmap(mStream);
return bm;
}

Is this happen because of the size of the array? Can any one give a method to do this task? It will be greatly appreciated.

thank you

I suspect myByteArray is neither a System.Drawing.Image nor a System.Drawing.Bitmap. You have to convert it into one. — Dour High Arch
– Dour High Arch, Commented Nov 12, 2014 at 19:57
myByteArray{byte[921600]} isn't valid C#. What is your actual byte[] initialization? And there's no FromImage() method in System.Drawing.Image. If you show invalid code, you're only going to get useless answers. — Peter Duniho
– Peter Duniho, Commented Nov 12, 2014 at 19:59
I got this array through capture card callback function. This is the method i use for that. public static int ShowPIP(VIDEO_SAMPLE_INFO VideoInfo, IntPtr ptData, int lLength, long tRefTime, int lUserData) { byte[] bData = new byte[lLength]; Marshal.Copy(ptData, bData, 0, lLength); m_ShowPipForm.ShowPIP(VideoInfo, myByteArray); return 1; } — Nuwan
– Nuwan, Commented Nov 12, 2014 at 20:07

SuperOli · Accepted Answer · 2014-11-12 21:40:13Z

1

If your myByteArray is raw image data, this should work:

Bitmap bmp = null;
unsafe
{
    fixed (byte* p = myByteArray)
    {
        IntPtr unmanagedPointer = (IntPtr)p;

        // Deduced from your buffer size
        int width = 640;
        int height = 480;
        bmp = new Bitmap(width, height, width * 3, System.Drawing.Imaging.PixelFormat.Format24bppRgb, unmanagedPointer);
    }
}

answered Nov 12, 2014 at 21:40

SuperOli

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3 Comments

Nuwan Over a year ago

Thank you very much sir. This is work fine. But When display images the image is up side down.

Nuwan Over a year ago

i used bmp.RotateFlip(RotateFlipType.Rotate180FlipNone); and now i work fine. Thank You

SuperOli Over a year ago

I think you can use a negative stride to do that (3rd parameter of the constructor): -(width * 3)

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