c++串口使用类

  1 #ifndef  _COMHANDLE_H_
  2 #define  _COMHANDLE_H_
  3 #endif
  4 #include<string>
  5 #include<windows.h>
  6 using namespace std;
  7 
  8 //string转LPCWSTR
  9 LPCWSTR stringToLPCWSTR(std::string orig)
 10 {
 11     size_t origsize = orig.length() + 1;
 12     const size_t newsize = 100;
 13     size_t convertedChars = 0;
 14     wchar_t *wcstring = (wchar_t *)malloc(sizeof(wchar_t)*(orig.length() - 1));
 15     mbstowcs_s(&convertedChars, wcstring, origsize, orig.c_str(), _TRUNCATE);
 16     return wcstring;
 17 }
 18 /////////////////////////
 19 //ComHandle.h
 20 //串口收发
 21 /////////////////////////
 22 #pragma once
 23 
 24 class COM
 25 {
 26 public:
 27     void Send(string str);
 28     void Receieve();
 29     static void GetCom();
 30     COM(unsigned int Com, unsigned int BaudRate, unsigned int ByteSize, BYTE StopBits, BYTE Parity);
 31     COM(unsigned int Com);
 32 private:
 33     HANDLE hcom;
 34 };
 35 
 36 //Com:端口号，如COM3
 37 COM::COM(unsigned int Com)
 38 {
 39     string str = "COM" + to_string(Com);  
 40     hcom = CreateFile(stringToLPCWSTR(str), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING
 41         , FILE_ATTRIBUTE_NORMAL, NULL);
 42     if (hcom == INVALID_HANDLE_VALUE)
 43     {
 44 
 45         printf("打开串口失败！\n");
 46         system("pause");
 47         exit(0);
 48     }
 49     SetupComm(hcom, 1024, 1024);
 50     DCB dcb;
 51     GetCommState(hcom, &dcb);
 52     dcb.BaudRate = 115200;
 53     dcb.ByteSize = 8;
 54     dcb.Parity = 0;
 55     dcb.StopBits = 1;
 56     SetCommState(hcom, &dcb);
 57 }
 58 
 59 
 60 //Com：端口号例如COM1；BaudRate：波特率；ByteSize：数据位；StopBits：停止位；Parity：奇偶校验
 61 COM::COM(unsigned int Com, unsigned int BaudRate, unsigned int ByteSize, BYTE StopBits, BYTE Parity)
 62 {
 63     string str = "COM" + to_string(Com);
 64     hcom = CreateFile(stringToLPCWSTR(str), GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING
 65            , FILE_ATTRIBUTE_NORMAL, NULL);
 66     if (hcom == INVALID_HANDLE_VALUE)
 67     {
 68 
 69         printf("打开串口失败！\n");
 70         system("pause");
 71         exit(0);
 72     }
 73     SetupComm(hcom, 1024, 1024);
 74     DCB dcb;
 75     GetCommState(hcom, &dcb);
 76     dcb.BaudRate = BaudRate;
 77     dcb.ByteSize = ByteSize;
 78     dcb.Parity = Parity;
 79     dcb.StopBits = StopBits;
 80     SetCommState(hcom, &dcb);
 81 }
 82 
 83 //发送数据
 84 void COM::Send(string str)
 85 {
 86     string Message = str;
 87     //string Message = "dj1mcs(2,1)";
 88     string Wrap = Message + "\r\n";
 89     const char* data = Wrap.data();
 90     DWORD dwWrittenLen = 0;
 91     if (!WriteFile(hcom, data, strlen(data), &dwWrittenLen, NULL))
 92     {
 93         printf("发送数据失败！\n");
 94     }
 95     printf("往串口发送数据成功！");
 96 
 97 }
 98 
 99 
100 //接收数据
101 void COM::Receieve()
102 {
103     Sleep(500);
104     char Receive[1024] = {};
105     DWORD wCount;//读取的字节数 
106     BOOL bReadStat;
107     bReadStat = ReadFile(hcom, Receive, 1024, &wCount, NULL);
108     if (!bReadStat)
109     {
110         printf("读串口失败!");
111 
112     }
113     else
114     {
115         printf(Receive);
116         printf("\n");
117     }
118 
119 }
120 //获取端口状态
121 void COM::GetCom()
122 {
123     HANDLE hcom;
124     //默认检测COM端口的返回值
125     hcom = INVALID_HANDLE_VALUE;
126     BOOL ret = false;
127     //逐一进行COM   端口检测
128     for (int i = 1; i <= 32; i++)
129     {
130 
131         string   comname = "COM" + to_string(i);
132         //打开COM端口，并返回检测值
133         hcom = CreateFileA(comname.c_str(),     // 打开串口
134             GENERIC_READ | GENERIC_WRITE,  //读写方式
135             0, //不能共享
136             NULL, //安全属性，一般不用设为NULL
137             OPEN_EXISTING,   //打开已存在的设备
138             FILE_ATTRIBUTE_NORMAL,  //普通文件属性
139             0);       //无模板
140         //若无法打开指定COM端口
141         if (hcom == INVALID_HANDLE_VALUE)
142         {
143 
144             //取得错误信息
145             DWORD   err = ::GetLastError();
146             //若   err   为   2   ，即此COM端口尚未安装
147             if (err != 2)
148             {
149                 printf("端口%d未安装", i);
150             }
151         }
152         else
153         {
154             printf("端口%d正常\n", i);
155             ret = CloseHandle(hcom);
156             if (!ret)
157             {
158                 // TRACE("CLOSE_PORT_FAIL\n");
159                 printf("关闭串口失败!!");
160             }
161             //else
162             //{
163             //    printf("success");
164             //}
165         }
166 
167     }
168 }

使用例子 1 #include"ComHandle.h"

 2 using namespace std;
 3 
 4 
 5 
 6 int main()
 7 {
 8     COM::GetCom();  //查看端口状态
 9     unsigned int com = 0;10     string str = {};
11     cout << "请输入端口号：";
12     cin >> com;
13     COM com1(com);
14     cout << "请输入要发送的命令，输入list获取命令列表\n";
15     while (1)
16     {
17         cin >> str;
18         com1.Send(str);
19         com1.Receieve();
20     }
21     
22     system("pause");
23     return 0;
24 }