1、添加C++接口实现,将dll放置在运行路径下。
dll文件下载:https://files.cnblogs.com/files/ZM191018/SerialPortLib.7z?t=1721271982&download=true
[DllImport("SerialPortLib.dll",CharSet=CharSet.Unicode,CallingConvention =CallingConvention.StdCall)] static extern int openDevice(string COMName, int dwBaud, string sframe, ref UIntPtr hCom); [DllImport("SerialPortLib.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall)] static extern int closeDevice(UIntPtr hCom); [DllImport("SerialPortLib.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.StdCall)] static extern int startComminication(RECEIVE_CALLBACK receive, byte[] sendData, int dlen, UIntPtr hCom);
2、调用接口打开串口设备
UIntPtr hCom2 = UIntPtr.Zero; private void button3_Click(object sender, EventArgs e) { string strComName = comboBox1.Text; int iBaud = Convert.ToInt32(comboBox2.Text); string strFrame = comboBox3.Text; try { int iret = openDevice(strComName, iBaud, strFrame, ref hCom2); if (iret == 0) { button3.Enabled = false; } } catch (Exception ex) { MessageBox.Show(ex.ToString()); } }
3、调用接口将委托作为参数传入,当读取到数据时,进行回调
public delegate int RECEIVE_CALLBACK(IntPtr recvData, int dlen); private void button5_Click(object sender, EventArgs e) { string sendStr = richTextBox1.Text; byte[] sendArr=StringToHexByteArray(sendStr); int iret=startComminication(new RECEIVE_CALLBACK(RecvCallBack), sendArr,sendArr.Length, hCom2); } public int RecvCallBack(IntPtr recvData, int dlen) { if (recvData != null && dlen > 0) { byte[] data = new byte[dlen]; Marshal.Copy(recvData, data, 0, dlen); string str = BitConverter.ToString(data, 0, (int)dlen).Replace("-", ""); this.Invoke((EventHandler)delegate { richTextBox2.AppendText(str + "\n"); richTextBox2.SelectionStart = richTextBox2.Text.Length; richTextBox2.ScrollToCaret(); }); return 0; } else { return -1; } }
4、关闭串口
private void button4_Click(object sender, EventArgs e) { int iret = closeDevice(hCom2); if (iret == 0) { hCom2 = UIntPtr.Zero; button3.Enabled = true; } }
5、可能用到的方法
public static byte[] StringToHexByteArray(string hex) { if (hex.Length % 2 == 1) return null; int len = hex.Length >> 1; byte[] arr = new byte[len]; for (int i = 0; i < len; ++i) { arr[i] = (byte)((GetHexVal(hex[i << 1]) << 4) + (GetHexVal(hex[(i << 1) + 1]))); } return arr; } public static int GetHexVal(char hex) { int val = (int)hex; //For uppercase A-F letters: // return val - (val < 58 ? 48 : 55); //For lowercase a-f letters: //return val - (val < 58 ? 48 : 87); //Or the two combined, but a bit slower: return val - (val < 58 ? 48 : (val < 97 ? 55 : 87)); }
6、效果
标签:string,C#,UIntPtr,CharSet,C++,int,串口,byte,dlen From: https://www.cnblogs.com/ZM191018/p/18309059