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19826972
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0
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0
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3
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2013-11-07T02:36:10.210
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2017-04-27T20:28:38.003
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2017-04-27T20:28:38.003
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1755158
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1755158
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14991517
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2
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I finally got this sorted out myself a couple days ago. There are two parts, one to check the registry and another to check the vid/pid of the device. The registry method I use just to make sure I don't capture a null modem emulator like com0com. <pre><code> /// <summary> /// Removes any comm ports that are not explicitly defined as allowed in ALLOWED_TYPES /// </summary> /// <param name="allPorts">reference to List that will be checked</param> /// <returns></returns> private static void nullModemCheck(ref List<string> allPorts) { // Open registry to get the COM Ports available with the system RegistryKey regKey = Registry.LocalMachine; // Defined as: private const string REG_COM_STRING ="HARDWARE\DEVICEMAP\SERIALCOMM"; regKey = regKey.OpenSubKey(REG_COM_STRING); Dictionary<string, string> tempDict = new Dictionary<string, string>(); foreach (string p in allPorts) tempDict.Add(p, p); // This holds any matches we may find string match = ""; foreach (string subKey in regKey.GetValueNames()) { // Name must contain either VCP or Seial to be valid. Process any entries NOT matching // Compare to subKey (name of RegKey entry) if (!(subKey.Contains("Serial") || subKey.Contains("VCP"))) { // Okay, this might be an illegal port. // Peek in the dictionary, do we have this key? Compare to regKey.GetValue(subKey) if(tempDict.TryGetValue(regKey.GetValue(subKey).ToString(), out match)) { // Kill it! allPorts.Remove(match); // Reset our output string match = ""; } } } regKey.Close(); } </code></pre> The vid/pid portion was gleaned from <a href="http://t6953.techinpro.us/q/508141744f1eba38a4429885" rel="nofollow noreferrer" title="here">techinpro</a> <pre><code> /// <summary> /// Compile an array of COM port names associated with given VID and PID /// </summary> /// <param name="VID">string representing the vendor id of the USB/Serial convertor</param> /// <param name="PID">string representing the product id of the USB/Serial convertor</param> /// <returns></returns> private static List<string> getPortByVPid(String VID, String PID) { String pattern = String.Format("^VID_{0}.PID_{1}", VID, PID); Regex _rx = new Regex(pattern, RegexOptions.IgnoreCase); List<string> comports = new List<string>(); RegistryKey rk1 = Registry.LocalMachine; RegistryKey rk2 = rk1.OpenSubKey("SYSTEM\\CurrentControlSet\\Enum"); foreach (String s3 in rk2.GetSubKeyNames()) { RegistryKey rk3 = rk2.OpenSubKey(s3); foreach (String s in rk3.GetSubKeyNames()) { if (_rx.Match(s).Success) { RegistryKey rk4 = rk3.OpenSubKey(s); foreach (String s2 in rk4.GetSubKeyNames()) { RegistryKey rk5 = rk4.OpenSubKey(s2); RegistryKey rk6 = rk5.OpenSubKey("Device Parameters"); comports.Add((string)rk6.GetValue("PortName")); } } } } return comports; } </code></pre>
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1. POHow do I get serial Port device id?
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. UScory.todd
UserOwnerUserId
1. UScory.todd
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