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C#教程之C#实现扫描枪扫描二维码并打印(实例代码)
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试听地址 https://www.xin3721.com/eschool/CSharpxin3721/
试听地址 https://www.xin3721.com/eschool/CSharpxin3721/
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
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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
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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
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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
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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,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持!
如果你觉得本文对你有帮助,欢迎转载,烦请注明出处,谢谢!
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