我正在尝试在C＃中编写一个简单的程序，它将读取通过串行连接的Arduino输出的数据，从文本字符串中提取相关数据，这些文本字符串是为了便于在串行监视器中理解而格式化的，显示两个只读文本框中的两条信息作为计数器（每次更新信息时都会覆盖），并使用这些数字更新SQL表。
示例：
Arduino输出：
'Day Users: 234231'
'All Users: 433241'
C＃在textbox1中显示完整消息
C＃在textbox2中显示234231
C＃在textbox3中显示433241
C＃更新SQL表格，如：
SqlCommand myCommand = new SqlCommand("UPDATE USER_NUMBERS
SET NUMBERZ= 234231
WHERE UPTIME = DAYHK");
但显然，'234231'是一个变量，由Arduino的输入指定，然后通知textbox2的内容和更新SQL表所需的值。
我对C＃很新，但到目前为止，我有一个程序可以读取Arduino的串行数据并将整个输出放入textbox1，但不多了。
如何指定我想要分配给值的传入数据的一部分作为textbox2（或textbox3）中的文本输出，然后使用它来执行该操作以及更新我持有的值SQL表？
到目前为止，我的代码是：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Serial_Reader
{
public partial class Form1 : Form
{
string RxString;
public Form1()
{
InitializeComponent();
}
private void buttonStart_Click(object sender, EventArgs e)
{
serialPort1.PortName = "COM3";
serialPort1.BaudRate = 9600;
serialPort1.Open();
if (serialPort1.IsOpen)
{
buttonStart.Enabled = false;
buttonStop.Enabled = true;
buttonSQL.Enabled = true;
textBox1.ReadOnly = false;
}
}
private void buttonStop_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
serialPort1.Close();
buttonStart.Enabled = true;
buttonStop.Enabled = false;
buttonSQL.Enabled = false;
textBox1.ReadOnly = true;
}
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
// If the port is closed, don't try to send a character.
if (!serialPort1.IsOpen) return;
// If the port is Open, declare a char[] array with one element.
char[] buff = new char[1];
// Load element 0 with the key character.
buff[0] = e.KeyChar;
// Send the one character buffer.
serialPort1.Write(buff, 0, 1);
// Set the KeyPress event as handled so the character won't
// display locally. If you want it to display, omit the next line.
e.Handled = true;
}
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
RxString = serialPort1.ReadExisting();
this.Invoke(new EventHandler(DisplayText));
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (serialPort1.IsOpen) serialPort1.Close();
}
private void DisplayText(object sender, EventArgs e)
{
textBox1.AppendText(RxString);
}
private void buttonSQL_Click(object sender, EventArgs e)
{
}
}
}
正如你从'我'熟练的评论中看到的那样，但是编程不合理，我正在使用来自精彩教程here的代码：我的程序将有额外的一个按钮来开始SQL通信，停止当串口通信停止时，以及两个额外的文本框。
编辑：
输入格式为：
Someone got up from seat number 9
All-time users on seat number 9 is: 5
Today's total users: 17
All-time total users: 17
因此，检查串行监视器的非程序员可以轻松理解输出。第一行始终是'有人起身'或'有人坐下'，在第二行，只有数字改变，再次在第三和第四行，但第三和第四行的数字（在这种情况相同，因为系统运行不到一天）是那些需要解析的。
编辑2 （新密码）：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace Serial_Reader
{
public partial class Form1 : Form
{
string RxString;
public Form1()
{
InitializeComponent();
}
private void buttonStart_Click(object sender, EventArgs e)
{
serialPort1.PortName = "COM3";
serialPort1.BaudRate = 9600;
serialPort1.Open();
if (serialPort1.IsOpen)
{
buttonStart.Enabled = false;
buttonStop.Enabled = true;
buttonSQL.Enabled = true;
textBox1.ReadOnly = true;
}
}
private void buttonStop_Click(object sender, EventArgs e)
{
if (serialPort1.IsOpen)
{
serialPort1.Close();
buttonStart.Enabled = true;
buttonStop.Enabled = false;
buttonSQL.Enabled = false;
textBox1.ReadOnly = true;
}
}
private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
// If the port is closed, don't try to send a character.
if (!serialPort1.IsOpen) return;
// If the port is Open, declare a char[] array with one element.
char[] buff = new char[1];
// Load element 0 with the key character.
buff[0] = e.KeyChar;
// Send the one character buffer.
serialPort1.Write(buff, 0, 1);
// Set the KeyPress event as handled so the character won't
// display locally. If you want it to display, omit the next line.
e.Handled = true;
}
private void serialPort1_DataReceived(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
RxString = serialPort1.ReadExisting();
this.Invoke(new EventHandler(DisplayText));
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
if (serialPort1.IsOpen) serialPort1.Close();
}
private void DisplayText(object sender, EventArgs e)
{
textBox1.AppendText(RxString);
}
private void buttonSQL_Click(object sender, EventArgs e)
{
// SqlConnection myConnection = new SqlConnection("user id=username;" +
// "password=password;server=serverurl;" +
// "Trusted_Connection=yes;" +
// "database=database; " +
// "connection timeout=30");
do
{
string dayUsers, allUsers;
string s1 = "Today's total users: ";
string s2 = "All-time total users: ";
if (RxString.Contains(s1))
{
dayUsers = RxString.Replace(s1, "");
textDU.Text = dayUsers;
// string queryDay = "UPDATE USER_NUMBERS SET NUMBERZ=" + dayUsers + "WHERE UPTIME=DAYHK";
}
if (RxString.Contains(s2))
{
allUsers = RxString.Replace(s2, "");
textAU.Text = allUsers;
// string queryAll = "UPDATE USER_NUMBERS SET NUMBERZ=" + allUsers + "WHERE UPTIME=ALLHK";
}
}
while (serialPort1.IsOpen);
}
private void textDU_TextChanged(object sender, EventArgs e)
{
}
private void textAU_TextChanged(object sender, EventArgs e)
{
}
}
}
编辑3 （传入数据）：
if (abs (then [i] - now[i]) > THRESH)
{
Serial.print ("Someone ");
if (now [i] > then [i])
{
Serial.print ("sat on");
allusers++;
dayusers++;
digitalWrite(counterPin, HIGH); // hit counter
delay(75);
digitalWrite(counterPin, LOW);
val[i]++;
}
else
{
Serial.print ("got up from");
}
Serial.print (" seat number ");
Serial.println (i);
Serial.print ("All-time users on seat number ");
Serial.print (i);
Serial.print (" is: ");
Serial.println (val[i]);
Serial.print ("Today's total users: ");
Serial.println (dayusers);
Serial.print ("All-time total users: ");
Serial.println (allusers);
}
答案 0 :(得分：1)
如果您知道输入字符串始终采用相同的格式，并且数字始终为6位数，则可以使用简单的子字符串：
int dayUsers, allUsers;
Int32.TryParse(RxString.Substring(12, 6), out dayUsers);
Int32.TryParse(RxString.Substring(32, 6), out allUsers);
否则你可以使解析更复杂一些：
int dayUsers, allUsers;
string[] parts = RxString.Split('\'', ':');
if (parts.Length > 5)
{
Int32.TryParse(parts[2].Trim(), out dayUsers);
Int32.TryParse(parts[5].Trim(), out allUsers);
}
然后只需要在文本框和SQL查询中使用数字：
textBox2.Text = dayUsers.ToString();
textBox3.Text = allUsers.ToString();
string query = "UPDATE USER_NUMBERS SET NUMBERZ=" + dayUsers + "WHERE UPTIME=DAYHK"
修改 鉴于textBox1中有四行数据，您可以使用类似的东西来提取包含数字的字符串：
string[] inputLines = textBox1.Text.Split('\n');
if (inputLines.Length == 4)
{
string dayUsers = inputLines[2].Substring(inputLines[2].IndexOf(':') + 1).Trim();
string allUsers = inputLines[3].Substring(inputLines[3].IndexOf(':') + 1).Trim();
}
编辑2： 建议解析TextBox1中可能不完整的数据的代码：
private void buttonSQL_Click(object sender, EventArgs e)
{
// Get unsaved input from text box
string input = textBox1.Text;
string[] inputLines = input.Split('\n');
// Find and process relevant input
foreach(string line in inputLines)
{
if (line.EndsWith("\r")) // Make sure line is complete
{
if (line.StartsWith("Today's total users: "))
{
string dayUsers = line.Substring(20).Trim();
textDU.Text = dayUsers;
// SQL query...
}
else if (line.StartsWith("All-time total users: "))
{
string allUsers = line.Substring(21).Trim();
textAU.Text = allUsers;
// SQL query...
}
}
}
// Only keep unparsed text in text box
textBox1.Text = inputLines[inputLines.Length - 1];
}