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;
p【文章出处http://www.nextecloud.cn/kt.html欢迎转载】ublic 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，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海外IDC网网站的支持！
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