串口指令打印POS小票（测试用STAR SP742型号）

最近搞了个通过串口发送指令进行POS小票打印的程序，测试的机器是STAR SP742型号POS机。

 

主要的原理就是先把报表转成图片，再通过发送打印图片指令进行小票打印。

1.很多报表都有转成图片的函数方法，我选择的报表是VS自带的报表（RDLC格式），因为毕竟我的程序是C#写的嘛！

2.STAR SP742型号POS机打印图片的指令如下：

 ESC K n NUL d1 d2…dn

[名称]标准密度图象

[代码]ASCII  ESC  K  n  NUL  d1 d2 ……dn

     十六进制  1B    4B n  00    d1 d2 ……dn

        十进制  27    75 n  0      d1 d2 ……dn

[参数定义范围] 1≤n≤总点数

                      0≤d≤255

 

了解完了上面几点，那么接着看程序了。

首先定义一个接口，毕竟我的打印程序还是有一点清晰度问题的，接口便于扩展嘛

public interface IPrinter { string Name { get; set; } /// <summary> /// 打印报表 /// </summary> /// <param name="report"></param> /// <param name="err"></param> void Print(LocalReport report,out string err); }

 

接着实现上面的接口，这也是本打印程序的重点啦～

public class SerialPortPrinter : IPrinter,IDisposable { private int m_currentPageIndex; private IList<Stream> m_streams; private SerialPort port; public AutoResetEvent receiveNow; private string _Name; public string Name { get { return _Name; } set { _Name = value; } } public SerialPortPrinter(string PortName) { _Name = PortName; receiveNow = new AutoResetEvent(false); port = new SerialPort(); port.PortName = _Name; port.DataReceived += new System.IO.Ports.SerialDataReceivedEventHandler(this.serialPort_DataReceived); } public void Print(LocalReport report, out string err) { err = ""; try { Export(report); m_currentPageIndex = 0; Print(); } catch (Exception ex) { err = ex.Message; } finally { foreach (Stream s in m_streams) { s.Close(); s.Dispose(); } m_streams.Clear(); } } private void Export(LocalReport report) { string deviceInfo = "<DeviceInfo>" + " <OutputFormat>EMF</OutputFormat>" + //" <PageWidth>2.65in</PageWidth>" + //" <PageHeight>11in</PageHeight>" + " <MarginTop>0.00in</MarginTop>" + " <MarginLeft>0.00in</MarginLeft>" + " <MarginRight>0.00in</MarginRight>" + " <MarginBottom>0.00in</MarginBottom>" + "</DeviceInfo>"; Warning[] warnings; m_streams = new List<Stream>(); report.Render("Image", deviceInfo, CreateStream, out warnings); foreach (Stream stream in m_streams) stream.Position = 0; } private Stream CreateStream(string name, string fileNameExtension, Encoding encoding, string mimeType, bool willSeek) { Stream stream = new FileStream(name + _Name + "." + fileNameExtension, FileMode.Create); m_streams.Add(stream); return stream; } private void Print() { if (m_streams == null || m_streams.Count == 0) { throw new Exception("Data Is Empty"); } if (!port.IsOpen) { port.PortName = _Name; port.Open(); } foreach (Stream m_stream in m_streams) { char[] printChars = new char[] { (char)13, (char)10 };//换行（根据记忆开关设置） 换行 port.Write(printChars, 0, printChars.Length); printChars = new char[] { (char)27, '@' };//命令初始化 port.Write(printChars, 0, printChars.Length); printChars = new char[] { (char)27, '3', (char)24 };//设置n/216英寸行距 24 port.Write(printChars, 0, printChars.Length); pageImage = new Metafile(m_stream); int height = (int)(pageImage.Height * 255 / pageImage.Width); Bitmap bm = new Bitmap(255, height); Graphics gs = Graphics.FromImage(bm); gs.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.High; gs.EnumerateMetafile(pageImage, new Rectangle(0, 0, 255, height), MetafileCallback); //Image img =bmDouble.GetThumbnailImage(pageImage.Width, pageImage.Height, null, new System.IntPtr()); //Bitmap bm = new Bitmap(img); //bm.Save("AddChipRpt2.png", System.Drawing.Imaging.ImageFormat.Png); gs.Dispose(); int iActualHeight = 0; byte[][] imgBitInfo = new byte[(bm.Height + 7) / 8][]; for (int i = 0; i < (bm.Height + 7) / 8; i++) { imgBitInfo[i] = new byte[bm.Width]; } for (int i = 0; i < bm.Width; i++) { for (int j = 0; j < bm.Height; j++) { imgBitInfo[j / 8][i] = Convert.ToByte(imgBitInfo[j / 8][i] << 1); Color pixel = bm.GetPixel(i, j); byte greyLevel = (byte)(0.3 * pixel.R + 0.59 * pixel.G + 0.11 * pixel.B); greyLevel = Convert.ToByte((pixel.A == 0 || greyLevel >250) ? 0 : 1); imgBitInfo[j / 8][i] += greyLevel; //imgBitInfo[j / 8][i] += Convert.ToByte(bm.GetPixel(i, j).ToArgb() == 0 ? 0 : 1); //imgBitInfo[j / 8][i] += Convert.ToByte((255-greyLevel) < OpacityThreshold ? 0 : 1); if (greyLevel > 0 && iActualHeight < j / 8) { iActualHeight = j / 8; } } } for (int i = 0; i <= iActualHeight; i++) { //打印每行数据前,先检查打印机状态 int State = GetPrinterState(); if (State > 0) { throw new Exception("Print Error" + State); } byte[] aImgBit = new byte[imgBitInfo[i].Length + 4]; aImgBit[0] = Convert.ToByte(27); aImgBit[1] = Convert.ToByte('K'); aImgBit[2] = Convert.ToByte(imgBitInfo[i].Length); aImgBit[3] = Convert.ToByte(0); Array.Copy(imgBitInfo[i], 0, aImgBit, 4, imgBitInfo[i].Length); port.Write(aImgBit, 0, aImgBit.Length);//此命令打印图象，由n决定图象数据的项数。 //每行中可打印的图象数据的个数受限于图象总数。超过图象总数或右边界的数据被忽略。 //关于图象总数的详细介绍，请参考每个打印机的规范手册。 //这个命令的打印方式是单向打印。（SP2000，BD100） //图象打印结束后，打印机自动返回到字符方式。 port.Write("/n"); } printChars = new char[] { (char)27, 'd', (char)3 };//走纸到切纸位置，然后执行部分切纸 port.Write(printChars, 0, printChars.Length); } } Metafile pageImage; private bool MetafileCallback( EmfPlusRecordType recordType, int flags, int dataSize, IntPtr data, PlayRecordCallback callbackData) { byte[] dataArray = null; if (data != IntPtr.Zero) { // Copy the unmanaged record to a managed byte buffer // that can be used by PlayRecord. dataArray = new byte[dataSize]; Marshal.Copy(data, dataArray, 0, dataSize); } pageImage.PlayRecord(recordType, flags, dataSize, dataArray); return true; } /// <summary> /// 取打印机状态 (大于零表示打印机有问题) /// </summary> /// <returns></returns> public int GetPrinterState() { int stat = 4; try { if (!port.IsOpen) { port.PortName = _Name; port.Open(); } receiveNow.Reset(); char[] printChars = new char[] { (char)5 };//请求ENQ状态字 port.Write(printChars, 0, printChars.Length); if (receiveNow.WaitOne(1000, false)) { stat = port.ReadByte(); } } catch { receiveNow.Reset(); port.Close(); stat = 4; } stat &= 0xCF;//0xCF; return stat; } private void serialPort_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e) { try { if (e.EventType == SerialData.Chars) receiveNow.Set(); } catch (Exception ex) { throw ex; } } public void Dispose() { receiveNow.Close(); port.Close(); port.Dispose(); } }

 

其实在MSDN里也有一个RDLC报表打印的代码，下面也贴出来吧～

public class DriverPrinter : IPrinter { private int m_currentPageIndex; private IList<Stream> m_streams; private string _Name; public string Name { get { return _Name; } set { _Name = value; } } public DriverPrinter(string PrinterName) { _Name = PrinterName; } public void Print(LocalReport report, out string err) { err = ""; try { Export(report); m_currentPageIndex = 0; Print(); } catch(Exception ex) { err = ex.Message; } finally { foreach (Stream s in m_streams) { s.Close(); s.Dispose(); } m_streams.Clear(); } } private void Export(LocalReport report) { string deviceInfo = "<DeviceInfo>" + " <OutputFormat>EMF</OutputFormat>" + //" <PageWidth>2.65in</PageWidth>" + //" <PageHeight>11in</PageHeight>" + " <MarginTop>0.00in</MarginTop>" + " <MarginLeft>0.00in</MarginLeft>" + " <MarginRight>0.00in</MarginRight>" + " <MarginBottom>0.00in</MarginBottom>" + "</DeviceInfo>"; Warning[] warnings; m_streams = new List<Stream>(); report.Render("Image", deviceInfo, CreateStream, out warnings); foreach (Stream stream in m_streams) stream.Position = 0; } private Stream CreateStream(string name, string fileNameExtension, Encoding encoding, string mimeType, bool willSeek) { Stream stream = new FileStream(name + _Name + "." + fileNameExtension, FileMode.Create); m_streams.Add(stream); return stream; } private void Print() { if (m_streams == null || m_streams.Count == 0) { throw new Exception("Data Is Empty"); } PrintDocument printDoc = new PrintDocument(); printDoc.PrinterSettings.PrinterName = _Name; if (!printDoc.PrinterSettings.IsValid) { string msg = String.Format("Can't find printer /"{0}/".", _Name); throw new Exception(msg); } printDoc.PrintPage += new PrintPageEventHandler(PrintPage); printDoc.DefaultPageSettings.Landscape = false; printDoc.PrintController = new StandardPrintController(); printDoc.Print(); } private void PrintPage(object sender, PrintPageEventArgs ev) { Metafile pageImage = new Metafile(m_streams[m_currentPageIndex]); ev.Graphics.DrawImage(pageImage, 0, 0); m_currentPageIndex++; ev.HasMorePages = (m_currentPageIndex < m_streams.Count); } }

 

好了！打印功能的程序代码就这样OK啦～下面该做个窗口程序测试测试了

上面的界面拖得不是太好看，不哦过测试嘛～别忘了在“打印”按钮的点击事件里加测试代码。

private void button1_Click(object sender, EventArgs e) { IPrinter printer = new SerialPortPrinter("COM1"); //IPrinter printer = new DriverPrinter("Pos"); ; string error; printer.Print(reportViewer1.LocalReport, out error); }

Ctrl F5 运行吧！