C#实现扫描枪扫描二维码并打印(实例代码)

技术  /  管理员 发布于 5年前   538

1.使用usb口输入的扫描枪，这里实现使用了winform

首先创建一个CS文件

using System;using System.Collections.Generic;using System.Linq;using System.Reflection;using System.Runtime.InteropServices;using System.Text;namespace am_sign{ class BardCodeHooK {  public delegate void BardCodeDeletegate(BarCodes barCode);  public event BardCodeDeletegate BarCodeEvent;  public struct BarCodes  {   public int VirtKey;//虚拟吗   public int ScanCode;//扫描码   public string KeyName;//键名   public uint Ascll;//Ascll   public char Chr;//字符   public string BarCode;//条码信息   public bool IsValid;//条码是否有效   public DateTime Time;//扫描时间  }  private struct EventMsg  {   public int message;   public int paramL;   public int paramH;   public int Time;   public int hwnd;  }  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  private static extern bool UnhookWindowsHookEx(int idHook);  [DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]  private static extern int CallNextHookEx(int idHook, int nCode, Int32 wParam, IntPtr lParam);  [DllImport("user32", EntryPoint = "GetKeyNameText")]  private static extern int GetKeyNameText(int IParam, StringBuilder lpBuffer, int nSize);  [DllImport("user32", EntryPoint = "GetKeyboardState")]  private static extern int GetKeyboardState(byte[] pbKeyState);  [DllImport("user32", EntryPoint = "ToAscii")]  private static extern bool ToAscii(int VirtualKey, int ScanCode, byte[] lpKeySate, ref uint lpChar, int uFlags);  delegate int HookProc(int nCode, Int32 wParam, IntPtr lParam);  BarCodes barCode = new BarCodes();  int hKeyboardHook = 0;  string strBarCode = "";  private int KeyboardHookProc(int nCode, Int32 wParam, IntPtr lParam)  {   if (nCode == 0)   {    EventMsg msg = (EventMsg)Marshal.PtrToStructure(lParam, typeof(EventMsg));    if (wParam == 0x100)//WM_KEYDOWN=0x100    {     barCode.VirtKey = msg.message & 0xff;//虚拟吗     barCode.ScanCode = msg.paramL & 0xff;//扫描码     StringBuilder strKeyName = new StringBuilder(225);     if (GetKeyNameText(barCode.ScanCode * 65536, strKeyName, 255) > 0)     {      barCode.KeyName = strKeyName.ToString().Trim(new char[] { ' ', '\0' });     }     else     {      barCode.KeyName = "";     }     byte[] kbArray = new byte[256];     uint uKey = 0;     GetKeyboardState(kbArray);     if (ToAscii(barCode.VirtKey, barCode.ScanCode, kbArray, ref uKey, 0))     {      barCode.Ascll = uKey;      barCode.Chr = Convert.ToChar(uKey);     }     TimeSpan ts = DateTime.Now.Subtract(barCode.Time);     if (ts.TotalMilliseconds > 50)     {      strBarCode = barCode.Chr.ToString();     }     else     {      if ((msg.message & 0xff) == 13 && strBarCode.Length > 3)      {       barCode.BarCode = strBarCode;       barCode.IsValid = true;      }      strBarCode += barCode.Chr.ToString();     }     barCode.Time = DateTime.Now;     if (BarCodeEvent != null) BarCodeEvent(barCode);//触发事件     barCode.IsValid = false;    }   }   return CallNextHookEx(hKeyboardHook, nCode, wParam, lParam);  }  //安装钩子  public bool Start()  {   if (hKeyboardHook == 0)   {    //WH_KEYBOARD_LL=13    hKeyboardHook = SetWindowsHookEx(13, new HookProc(KeyboardHookProc), Marshal.GetHINSTANCE(Assembly.GetExecutingAssembly().GetModules()[0]), 0);   }   return (hKeyboardHook != 0);  }  //卸载钩子  public bool Stop()  {   if (hKeyboardHook != 0)   {    return UnhookWindowsHookEx(hKeyboardHook);   }   return true;  } }}

2.在winform中调用

 BardCodeHooK BarCode = new BardCodeHooK();  public Form1()  {   InitializeComponent();   BarCode.BarCodeEvent += new BardCodeHooK.BardCodeDeletegate(BarCode_BarCodeEvent);  }  string value = ""; //value为扫码枪获取的内容，以Enter结尾  private delegate void ShowInfoDelegate(BardCodeHooK.BarCodes barCode);  private void ShowInfo(BardCodeHooK.BarCodes barCode)  {   if (this.InvokeRequired)   {    this.BeginInvoke(new ShowInfoDelegate(ShowInfo), new object[] { barCode });   }   else   {    if (barCode.KeyName.Equals("Enter"))    {     hook_KeyDown(value);     value = "";    }    else    {     value += barCode.Chr.ToString();    }   }  }  void BarCode_BarCodeEvent(BardCodeHooK.BarCodes barCode)  {   ShowInfo(barCode);  }

3.打印前，需要将TSLIB.dll文件放入c:\\windows\system下

using System.Runtime.InteropServices;namespace am_sign{ class TSCLIB_DLL {  [DllImport("TSCLIB.dll", EntryPoint = "about")]  public static extern int about();  [DllImport("TSCLIB.dll", EntryPoint = "openport")]  public static extern int openport(string printername);  [DllImport("TSCLIB.dll", EntryPoint = "barcode")]  public static extern int barcode(string x, string y, string type,      string height, string readable, string rotation,      string narrow, string wide, string code);  [DllImport("TSCLIB.dll", EntryPoint = "clearbuffer")]  public static extern int clearbuffer();  [DllImport("TSCLIB.dll", EntryPoint = "closeport")]  public static extern int closeport();  [DllImport("TSCLIB.dll", EntryPoint = "downloadpcx")]  public static extern int downloadpcx(string filename, string image_name);  [DllImport("TSCLIB.dll", EntryPoint = "formfeed")]  public static extern int formfeed();  [DllImport("TSCLIB.dll", EntryPoint = "nobackfeed")]  public static extern int nobackfeed();  [DllImport("TSCLIB.dll", EntryPoint = "printerfont")]  public static extern int printerfont(string x, string y, string fonttype,       string rotation, string xmul, string ymul,       string text);  [DllImport("TSCLIB.dll", EntryPoint = "printlabel")]  public static extern int printlabel(string set, string copy);  [DllImport("TSCLIB.dll", EntryPoint = "sendcommand")]  public static extern int sendcommand(string printercommand);  [DllImport("TSCLIB.dll", EntryPoint = "setup")]  public static extern int setup(string width, string height,      string speed, string density,      string sensor, string vertical,      string offset);  [DllImport("TSCLIB.dll", EntryPoint = "windowsfont")]  public static extern int windowsfont(int x, int y, int fontheight,   int rotation, int fontstyle, int fontunderline,       string szFaceName, string content);  //打开打印机端口,并进行相关设置  public static void openportExt()  {   TSCLIB_DLL.openport("Gprinter GP-3120TU");//找打打印机端口   TSCLIB_DLL.sendcommand("SIZE 70 mm,50 mm");//设置条码大小   TSCLIB_DLL.sendcommand("GAP 2 mm,0");//设置条码间隙   TSCLIB_DLL.sendcommand("SPEED 5");//设置打印速度   TSCLIB_DLL.sendcommand("DENSITY 8");//设置墨汁浓度   TSCLIB_DLL.sendcommand("DERECTION 1");//设置相对起点   TSCLIB_DLL.sendcommand("REFERENCE 3 mm,3 mm");//设置偏移边框   TSCLIB_DLL.sendcommand("CLS");//清除记忆（每次打印新的条码时先清除上一次的打印记忆）  }  //打印在二维码  public static void printVehicleCode(string name, string department, string seat_area,string qrcode)  {   TSCLIB_DLL.sendcommand("CLS");//需要清除上一次的打印记忆   TSCLIB_DLL.sendcommand("QRCODE 207,180,L,6,A,0,M2,S3,\"" + qrcode + "\"");   TSCLIB_DLL.windowsfont(200, 30, 60, 0, 2, 0, "Microsoft YaHei", name);   TSCLIB_DLL.windowsfont(210, 100, 30, 0, 0, 0, "Microsoft YaHei", department);   TSCLIB_DLL.windowsfont(20, 320, 40, 0, 0, 0, "Microsoft YaHei", seat_area);   TSCLIB_DLL.printlabel("1", "1");  }  //关闭打印机端口  public static void closeportExt()  {   TSCLIB_DLL.closeport();  } }}

4.调用打印

 TSCLIB_DLL.openportExt();           //Open specified printer driver TSCLIB_DLL.printVehicleCode(“测试”, “测试”, "测试", “二维码内容”); TSCLIB_DLL.closeport();

总结

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