关于串口
我点击button2向com4发送数据,为什么点击botton1时,不能读取点击button2时向串口发送的数据
private SerialPort spCom = new SerialPort("com4",9600,Parity.None,8,StopBits.One);
private void Form1_Load(object sender, EventArgs e)
{
if (spCom.IsOpen == false)
{
spCom.Open();
}
}
private void button2_Click(object sender, EventArgs e)
{
string aaaaa = spCom.ReadExisting();
MessageBox.Show(aaaaa);
}
private void button1_Click(object sender, EventArgs e)
{
spCom.Write("sss");
}