我是通过以下方式通过串口直接将收据打印到POS打印机,SerialPort port = new SerialPort("com6",9100,Parity.None,8,StopBits.One);

port.Open();

port.Write("Some Text");

port.Close();

我的问题是我将如何使用上述方法打印位图图像？任何帮助将不胜感激.

我还没有决定使用Microsoft POS for.net,因为它很慢并且需要时间来初始化打印机,客户不喜欢等待.

谢谢.

这应该会从位图中获取一个您可以发送到打印机的字符串：

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 = new BitArray(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++;

}

}

return new BitmapData()

{

Dots = dots,Height = (int)(bitmap.Height*scale),Width = (int)(bitmap.Width*scale)

};

}

}

public class BitmapData

{

public BitArray Dots

{

get;

set;

}

public int Height

{

get;

set;

}

public int Width

{

get;

set;

}

}