How to generate a dynamic GRF image to ZPL ZEBRA print

Question

I have a problem.

I´m generating a dynamic BMP image and trying to send this to a ZEBRA printer by ZPL commands. I need to convert my BMP to a GRF image. I think tha

Answer 1

Try the following code. Not tested!

public static string CreateGRF(string filename, string imagename)
{
    Bitmap bmp = null;
    BitmapData imgData = null;
    byte[] pixels;
    int x, y, width;
    StringBuilder sb;
    IntPtr ptr;

    try
    {
        bmp = new Bitmap(filename);
        imgData = bmp.LockBits(new Rectangle(0, 0, bmp.Width, bmp.Height), ImageLockMode.ReadOnly, PixelFormat.Format1bppIndexed);
        width = (bmp.Width + 7) / 8;
        pixels = new byte[width];
        sb = new StringBuilder(width * bmp.Height * 2);
        ptr = imgData.Scan0;
        for (y = 0; y < bmp.Height; y++)
        {
            Marshal.Copy(ptr, pixels, 0, width);
            for (x = 0; x < width; x++)
                sb.AppendFormat("{0:X2}", (byte)~pixels[x]);
            ptr = (IntPtr)(ptr.ToInt64() + imgData.Stride);
        }
    }
    finally
    {
        if (bmp != null)
        {
            if (imgData != null) bmp.UnlockBits(imgData);
            bmp.Dispose();
        }
    }
    return String.Format("~DG{0}.GRF,{1},{2},", imagename, width * y, width) + sb.ToString();
}