C#实现扫描枪扫描二维码并打印(实例代码)

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;
  }
 }
}

 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);
  }

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();
  }
 }
}

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