C# comport 打印图像

public string GetLogo()
{
string logo = "";
if (!File.Exists(@"C:\bitmap.bmp"))
return null;
BitmapData data = GetBitmapData(@"C:\bitmap.bmp");
BitArray dots = data.Dots;
byte[] width = BitConverter.GetBytes(data.Width);

int offset = 0;
MemoryStream stream = new MemoryStream();
BinaryWriter bw = new BinaryWriter(stream);

bw.Write((char)0x1B);
bw.Write('@');

bw.Write((char)0x1B);
bw.Write('3');
bw.Write((byte)24);

while (offset < data.Height)
{
bw.Write((char)0x1B);
bw.Write('*');         // bit-image mode
bw.Write((byte)33);    // 24-dot double-density
bw.Write(width[0]);  // width low byte
bw.Write(width[1]);  // width high byte

for (int x = 0; x < data.Width; ++x)
{
for (int k = 0; k < 3; ++k)
{
byte slice = 0;
for (int b = 0; b < 8; ++b)
{
int y = (((offset / 8) + k) * 8) + b;
// Calculate the location of the pixel we want in the bit array.
// It'll be at (y * width) + x.
int i = (y * data.Width) + x;

// If the image is shorter than 24 dots, pad with zero.
bool v = false;
if (i < dots.Length)
{
v = dots[i];
}
slice |= (byte)((v ? 1 : 0) << (7 - b));
}

bw.Write(slice);
}
}
offset += 24;
bw.Write((char)0x0A);
}
// Restore the line spacing to the default of 30 dots.
bw.Write((char)0x1B);
bw.Write('3');
bw.Write((byte)30);

bw.Flush();
byte[] bytes = stream.ToArray();
return logo + Encoding.Default.GetString(bytes);
}

public BitmapData GetBitmapData(string bmpFileName)
{
using (var bitmap = (Bitmap)Bitmap.FromFile(bmpFileName))
{
var threshold = 127;
var index = 0;
double multiplier = 570; // this depends on your printer model. for Beiyang you should use 1000
double scale = (double)(multiplier/(double)bitmap.Width);
int xheight = (int)(bitmap.Height * scale);int xwidth =(int)(bitmap.Width* scale);var dimensions = xwidth * xheight;var dots =newBitArray(dimensions);for(var y =0; y < xheight; y++){for(var x =0; x < xwidth; x++){var _x =(int)(x / scale);var _y =(int)(y / scale);var color = bitmap.GetPixel(_x, _y);var luminance =(int)(color.R *0.3+ color.G *0.59+ color.B *0.11);
dots[index]=(luminance < threshold);
index++;}}returnnewBitmapData(){Dots= dots,Height=(int)(bitmap.Height*scale),Width=(int)(bitmap.Width*scale)};}}publicclassBitmapData{publicBitArrayDots{
get;set;}publicintHeight{
get;set;}publicintWidth{
get;set;}}