C#实现扫描枪扫描二维码并打印(实例代码)

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

以上所述是小编给大家介绍的c#实现扫描枪扫描二维码并打印，希望对大家有所帮助