我是通过串口直接将收据打印到POS打印机上，方法如下：
SerialPort port = new SerialPort("com6", 9100, Parity.None, 8, StopBits.One);
port.Open();
port.Write("Some Text");
port.Close();
这将使您从位图中获得一个字符串，您可以将其发送到打印机：
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;
}
}
可能现在还没有用处，但我认为要直接打印到打印机，您必须找到编程手册并发送命令转义符。
这种类型的打印机有自己的一套命令等等，可以格式化、旋转文本、打印条形码、上传和打印图像等等。
除非您知道语言并正确使用它，否则打印机的行为可能是不可预测的。
步骤2：将代码添加到您喜欢的按钮中： private void button1_Click(object sender, EventArgs e)
{
SerialPort port = new SerialPort("com6", 9100, Parity.None, 8, StopBits.One);
port.Open();
ASCIIEncoding ascii = new ASCIIEncoding();
port.Write(ascii.GetString(new byte[] { 28, 112, 1, 0})); //Printing the Above uploaded Logo
port.WriteLine("Your Text");
port.Close();
}