随着工业互联的发展，扫码枪在很多场合都有所应用，超市、商场以及一些智能工厂。今天主要讲如何通过c#实现与新大陆扫码枪（oy10）进行通信，对于扫码枪的配置，这里就不多说了，结合说明书就可以实现。这里值得注意的是，如果安装驱动后，电脑设备管理器中看不到com口，可能需要扫一个条形码来设置一下，具体参考说明书通讯配置章节。
首先贴下界面，基于winform开发，主要就是正常的串口通信，涉及的技术包括ui界面设计+串口通信知识+参数配置处理+委托更新界面，涵盖了一个小系统必备的一些知识。
再来贴一些源码，首先贴个核心串口类的编写：
1 using system;
2 using system.collections.generic;
3 using system.io.ports;
4 using system.linq;
5 using system.text;
6 using system.threading.tasks;
7
8 namespace newland
9 {
10 public delegate void showmsgdelegate(string info);
11
12 public class newlandserial
13 {
14
15 //定义串口类对象
16 private serialport mycom;
17 //定义接收字节数组
18 byte[] bdata = new byte[1024];
19 byte mreceivebyte;
20 int mreceivebytecount = 0;
21 public showmsgdelegate myshowinfo;
22
23 public newlandserial()
24 {
25 mycom = new serialport();
26
27 }
28
29 #region 打开关闭串口方法
30 /// <summary>
31 /// 打开串口方法【9600 n 8 1】
32 /// </summary>
33 /// <param name="ibaudrate">波特率</param>
34 /// <param name="iportno">端口号</param>
35 /// <param name="idatabits">数据位</param>
36 /// <param name="iparity">校验位</param>
37 /// <param name="istopbits">停止位</param>
38 /// <returns></returns>
39 public bool openmycomm(int ibaudrate, string iportno, int idatabits, parity iparity, stopbits istopbits)
40 {
41 try
42 {
43 //关闭已打开串口
44 if (mycom.isopen)
45 {
46 mycom.close();
47 }
48 //设置串口属性
49 mycom.baudrate = ibaudrate;
50 mycom.portname = iportno;
51 mycom.databits = idatabits;
52 mycom.parity = iparity;
53 mycom.stopbits = istopbits;
54 mycom.receivedbytesthreshold = 1;
55 mycom.datareceived += mycom_datareceived;
56
57 mycom.open();
58 return true;
59 }
60 catch
61 {
62 return false;
63 }
64 }
65
66 private void mycom_datareceived(object sender, serialdatareceivedeventargs e)
67 {
68 mreceivebytecount = 0;
69 while (mycom.bytestoread > 0)
70 {
71 mreceivebyte = (byte)mycom.readbyte();
72 bdata[mreceivebytecount] = mreceivebyte;
73 mreceivebytecount += 1;
74 if (mreceivebytecount >= 1024)
75 {
76 mreceivebytecount = 0;
77 //清除输入缓存区
78 mycom.discardinbuffer();
79 return;
80 }
81 }
82 if (mreceivebytecount > 0)
83 {
84 myshowinfo(encoding.ascii.getstring(getbytearray(bdata, 0, mreceivebytecount)));
85 }
86
87 }
88
89 /// <summary>
90 /// 自定义截取字节数组
91 /// </summary>
92 /// <param name="bytearr"></param>
93 /// <param name="start"></param>
94 /// <param name="length"></param>
95 /// <returns></returns>
96 private byte[] getbytearray(byte[] bytearr, int start, int length)
97 {
98 byte[] res = new byte[length];
99 if (bytearr != null && bytearr.length >= length)
100 {
101 for (int i = 0; i < length; i++)
102 {
103 res[i] = bytearr[i + start];
104 }
105
106 }
107 return res;
108 }
109
110
111 /// <summary>
112 /// 关闭串口方法
113 /// </summary>
114 /// <returns></returns>
115 public bool closeport()
116 {
117 if (mycom.isopen)
118 {
119 mycom.close();
120 return true;
121 }
122 else
123 {
124 return false;
125 }
126
127 }
128 #endregion
129
130 }
131 }
再者就是界面的调用，直接看代码：
1 using system;
2 using system.collections.generic;
3 using system.componentmodel;
4 using system.configuration;
5 using system.data;
6 using system.drawing;
7 using system.io.ports;
8 using system.linq;
9 using system.text;
10 using system.threading.tasks;
11 using system.windows.forms;
12
13 namespace newland
14 {
15 public partial class frmmain : form
16 {
17 public frmmain()
18 {
19 initializecomponent();
20 this.load += frmmain_load;
21
22 }
23
24 private void frmmain_load(object sender, eventargs e)
25 {
26 this.btn_disconn.enabled = false;
27 }
28
29 private void txt_info_doubleclick(object sender, eventargs e)
30 {
31 this.txt_info.clear();
32 }
33
34 newlandserial mynewland;
35
36
37 private void btn_connect_click(object sender, eventargs e)
38 {
39 string port= configurationmanager.appsettings["port"].tostring();
40
41 mynewland = new newlandserial();
42 mynewland.myshowinfo += showinfo;
43
44 if (mynewland.openmycomm(9600, port, 8, parity.none, stopbits.one))
45 {
46 messagebox.show("连接成功！", "建立连接");
47 this.btn_connect.enabled = false;
48 this.btn_disconn.enabled = true;
49 }
50 else
51 {
52 messagebox.show("连接失败！", "建立连接");
53 }
54 }
55
56 private void showinfo(string info)
57 {
58 invoke(new action(() =>
59 {
60 this.txt_info.appendtext(datetime.now.tostring("yyyy/mm/dd hh:mm:ss") + " " + info + environment.newline);
61 }));
62 }
63
64 private void btn_disconn_click(object sender, eventargs e)
65 {
66 if (mynewland.closeport())
67 {
68 messagebox.show("断开连接成功！", "断开连接");
69 this.btn_connect.enabled = true;
70 this.btn_disconn.enabled = false;
71 }
72 else
73 {
74 messagebox.show("断开连接失败！", "断开连接");
75 }
76 }
77
78 private void btn_paraset_click(object sender, eventargs e)
79 {
80 new frmparaset().showdialog();
81 }
82 }
83 }
最后是参数配置，通过app.config实现：
1 using system;
2 using system.collections.generic;
3 using system.componentmodel;
4 using system.configuration;
5 using system.data;
6 using system.drawing;
7 using system.linq;
8 using system.text;
9 using system.threading.tasks;
10 using system.windows.forms;
11
12 namespace newland
13 {
14 public partial class frmparaset : form
15 {
16 public frmparaset()
17 {
18 initializecomponent();
19 this.load += frmparaset_load;
20 }
21
22 private void frmparaset_load(object sender, eventargs e)
23 {
24 for (int i = 0; i < 20; i++)
25 {
26 this.cmb_port.items.add("com" + i.tostring());
27 }
28
29 this.cmb_port.text = configurationmanager.appsettings["port"].tostring();
30 }
31
32 private void btn_set_click(object sender, eventargs e)
33 {
34 configuration cfa = configurationmanager.openexeconfiguration(configurationuserlevel.none); //首先打开配置文件
35 cfa.appsettings.settings["port"].value = this.cmb_port.text;
36 cfa.save(); //保存配置文件
37 configurationmanager.refreshsection("appsettings"); //刷新配置文件
38 this.close();
39 }
40 }
41 }
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