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 that my Hexadecimal extracted by the BMP image isn´t correct.
The printed image is blurred and incorrect.
This is my code:
string bitmapFilePath = @oldArquivo; // file is attached to this support article
byte[] bitmapFileData = System.IO.File.ReadAllBytes(bitmapFilePath);
int fileSize = bitmapFileData.Length;
Bitmap ImgTemp = new Bitmap(bitmapFilePath);
Size ImgSize = ImgTemp.Size;
ImgTemp.Dispose();
// The following is known about test.bmp. It is up to the developer
// to determine this information for bitmaps besides the given test.bmp.
int width = ImgSize.Width;
int height = ImgSize.Height;
int bitmapDataOffset = 62; // 62 = header of the image
int bitmapDataLength = fileSize - 62;// 8160;
double widthInBytes = Math.Ceiling(width / 8.0);
// Copy over the actual bitmap data from the bitmap file.
// This represents the bitmap data without the header information.
byte[] bitmap = new byte[bitmapDataLength];
Buffer.BlockCopy(bitmapFileData, bitmapDataOffset, bitmap, 0, (bitmapDataLength));
// Invert bitmap colors
for (int i = 0; i < bitmapDataLength; i++)
{
bitmap[i] ^= 0xFF;
}
// Create ASCII ZPL string of hexadecimal bitmap data
string ZPLImageDataString = BitConverter.ToString(bitmap).Replace("-", string.Empty);
string comandoCompleto = "~DG" + nomeImagem + ".GRF,0" + bitmapDataLength.ToString() + ",0" + widthInBytes.ToString() + "," + ZPLImageDataString;
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();
}