Large black line appears when printing bmp files using the EPL2 print language

Question

This is the 3rd part to this topic. Part 1, Part 2..

I was successfully able to print my monochrome bitmap to my printer, however there is a large black stripe along the right of the image when the item prints.

Original file that the code is using

(Scanned in)What the printer printed

Code to generate binary blob

Rectangle rect = new Rectangle(0, 0, Bitmap.Width, Bitmap.Height);
System.Drawing.Imaging.BitmapData bmpData = null;
byte[] bitVaues = null;
int stride = 0;
try
{
    bmpData = Bitmap.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, Bitmap.PixelFormat);
    IntPtr ptr = bmpData.Scan0;
    stride = bmpData.Stride;
    int bytes = bmpData.Stride * Bitmap.Height;
    bitVaues = new byte[bytes];
    System.Runtime.InteropServices.Marshal.Copy(ptr, bitVaues, 0, bytes);
}
finally
{
    if (bmpData != null)
        Bitmap.UnlockBits(bmpData);
}

string str = String.Format("GW{0},{1},{2},{3},", X, Y, stride, Bitmap.Height);
byte[] ascii = Encoding.ASCII.GetBytes(str);
byte[] buffer = new byte[ascii.Length + bitVaues.Length + 1];
Buffer.BlockCopy(ascii, 0, buffer, 0, ascii.Length);
Buffer.BlockCopy(bitVaues, 0, buffer, ascii.Length, bitVaues.Length);
buffer[buffer.Length - 1] = (byte)'\n';
return buffer;

My initial theory is the BMP format is adding that line as a end of line marker and is not viable when rendered. I am thinking I may have to reparse the file after I have the binary array and take out the 00 00 00 at the end of every line. But I am posting here in case anyone thinks of a better way.

Answer 1

Microsoft bitmaps are always padded to an even 32 bits. When you generate the bitmap, round the width up to a multiple of 32 and you should be fine.