我有一个程序，要求从软件启动到关机为止都打开串行端口连接。
我的程序在计算机启动时启动（它在％startup％文件夹中-Windows 7中具有快捷方式）。
我正在使用进程浏览器（by Sysinternals监视我的串行端口）。 当一切正常时，我确实看到了我的开放端口。 但在计算机打开后的某个时间（正常应用关闭后） 我收到错误消息拒绝访问端口'com1'，我在进程浏览器中看到的全部是SMSvcHost.exe
这是开放的串行连接方法
static class CVFeedSerialUtilsV2
{
static string com = GetSerialPortComName();
const int sleepTimeInMs = 50;
private static SerialPort port = new SerialPort(com, 9600, Parity.None, 8, StopBits.One);
public static SerialPort Port
{
get { return port; }
}
public static void readAndOpenSerialPort()
{
try
{
if (String.IsNullOrEmpty(com))
{
return;
}
if (port != null && port.IsOpen)
port.Close();
if (!port.IsOpen)
{
port.DtrEnable = true; // Data-terminal-ready
port.RtsEnable = true; // Request-to-send
port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);
port.Open();
}
}
}
public static void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
//do stuff
}
}
这是我的表单关闭方法
private void frmBase_FormClosing(object sender, FormClosingEventArgs e)
{
try
{
//wait for some amount of time after calling the Close method before attempting to call the Open method,
//as the port may not be closed instantly.
if (CVFeedSerialUtilsV2.Port != null && CVFeedSerialUtilsV2.Port.IsOpen)
{
CVFeedSerialUtilsV2.Port.DiscardInBuffer();
CVFeedSerialUtilsV2.Port.DiscardOutBuffer();
CVFeedSerialUtilsV2.Port.DataReceived -= CVFeedSerialUtilsV2.port_DataReceived;
CVFeedSerialUtilsV2.Port.Close();
//CVFeedSerialUtilsV2.Port.Dispose();
}
System.Threading.Thread.Sleep(1000);
}
catch (Exception ex)
{
}
}
这就是我获取串行端口的方式
private static string GetSerialPortComName()
{
try
{
List<string> list = new List<string>();
string name = "";
ManagementObjectSearcher searcher2 = new ManagementObjectSearcher("SELECT * FROM Win32_PnPEntity");
foreach (ManagementObject mo2 in searcher2.Get())
{
if (mo2["Name"] != null)
{
name = mo2["Name"].ToString();
// Name will have a substring like "(COM12)" in it.
if (name.Contains("(COM"))
{
list.Add(name);
}
}
}
// remove duplicates, sort alphabetically and convert to array
string[] usbDevices = list.Distinct().OrderBy(s => s).ToArray();
foreach (String s in usbDevices)
{
if (s.ToLower().Contains("port"))
{
int start = s.IndexOf("(COM") + 1;
if (start >= 0)
{
int end = s.IndexOf(")", start + 3);
if (end >= 0)
{
// cname is like "COM14"
return s.Substring(start, end - start);
}
}
}
}
}
catch (Exception ex)
{
}
return "";
}