CODEWITHSUNDEEP
c#arraysbitmapindexing
goGud
goGud

Reputation: 4333

Index was outside the bounds of the array about bitmap

I have code which convert byte array to bitmap.. (In my Project I cannot use MemoryStream or others bitmap converter.)

Here is my code. 

public static Bitmap ConvertBitMap(int width, int height, byte[] imageData)
        {
            var data = new byte[width * height * 4];
            int o = 0;

            for (var i = 0; i < width * height ; i++)
            {
                var value = imageData[i];


                data[o++] = value;
                data[o++] = value;
                data[o++] = value;
                data[o++] = 0;
            }
           ...
           ...
           ..
           ..
}

When I run application i says "System.IndexOutOfRangeException: Index was outside the bounds of the array."

Here is arrayData information :

data   ------>     {byte[614400]}

imageData --->     {byte[105212]}

Could you please anyone help me about fixing this issue ? How can i handle this outside bounds problem ?

Upvotes: 2

Views: 638

Answers (2)

JaredPar
JaredPar

Reputation: 754725

The problem here is that the length of imageData is less than height * width. Hence you eventually get an exception on this line because i is greater than imageData.Length

var value = imageData[i];

Consider the sizes that you posted in the question

  • data : 614400
  • imageData : 105212

The size of data was calculated as height * width * 4 hence we can calculate height * width by dividing by 4 and we end up with height * width == 153600. This is clearly larger than 105212 and hence you end up accessing outside the bounds of the array

Upvotes: 1

Dan Drews
Dan Drews

Reputation: 1976

I'm not sure why this is happening, but the issue is that imageData size is not equal to width*height

This code should fix it (though it might not be what you're looking for it to do)

public static Bitmap ConvertBitMap(int width, int height, byte[] imageData)
        {
            var data = new byte[imageData.Length * 4];
            int o = 0;

            for (var i = 0; i < imageData.Length ; i++)
            {
                var value = imageData[i];


                data[o++] = value;
                data[o++] = value;
                data[o++] = value;
                data[o++] = 0;
            }
           ...
           ...
           ..
           ..
}

Upvotes: 1

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