枚举 window 系统串口的几种方法

mfc 下：

CString s; for (int i=1; i<256; i++) { s.Format("COM%d", i); if (CSerialPort::CheckCommPort(s)) { m_ListComm.AddString(s); } }

bool CSerialPort::CheckCommPort(LPCSTR commPortName) { COMMCONFIG cc; DWORD dwCCSize = sizeof(cc); return ::GetDefaultCommConfig(commPortName, &cc, &dwCCSize) == TRUE; }

C# 下可以直接使用

string[] ports = System.IO.Ports.SerialPort.GetPortNames();

但如果想要更高级的做法，如辨别由 usb, bluetooth 等虚拟出的串口，则

using System;

using System.Collections;

using System.Text;

using System.Runtime.InteropServices;

namespace Utility

{

public class CSystemDeviceInfo

{

protected const int DIGCF_PRESENT = (0x00000002);

protected const int MAX_DEV_LEN = 1000;

protected const int SPDRP_FRIENDLYNAME = (0x0000000C);

protected const int SPDRP_DEVICEDESC = (0x00000000);

[StructLayout(LayoutKind.Sequential)]

public class SP_DEVINFO_DATA

{

public int cbSize;

public Guid ClassGuid;

public int DevInst;

public ulong Reserved;

};

[DllImport("setupapi.dll")]//

public static extern Boolean

SetupDiClassGuidsFromNameA(string ClassN, ref Guid guids,

UInt32 ClassNameSize, ref UInt32 ReqSize);

[DllImport("setupapi.dll")]

public static extern IntPtr                //result HDEVINFO

SetupDiGetClassDevsA(ref Guid ClassGuid, UInt32 Enumerator,

IntPtr hwndParent, UInt32 Flags);

[DllImport("setupapi.dll")]

public static extern Boolean

SetupDiEnumDeviceInfo(IntPtr DeviceInfoSet, UInt32 MemberIndex,

SP_DEVINFO_DATA DeviceInfoData);

[DllImport("setupapi.dll")]

public static extern Boolean

SetupDiDestroyDeviceInfoList(IntPtr DeviceInfoSet);

[DllImport("setupapi.dll")]

public static extern Boolean

SetupDiGetDeviceRegistryPropertyA(IntPtr DeviceInfoSet,

SP_DEVINFO_DATA DeviceInfoData, UInt32 Property,

UInt32 PropertyRegDataType, StringBuilder PropertyBuffer,
UInt32 PropertyBufferSize, IntPtr RequiredSize);

public static string[] EnumerateDevices(string ClassName)

{

ArrayList devices = new ArrayList(8);

StringBuilder DeviceName = new StringBuilder("");

UInt32 RequiredSize = 0;

Guid guid = Guid.Empty;

Guid[] guids = new Guid[1];

IntPtr NewDeviceInfoSet;

SP_DEVINFO_DATA DeviceInfoData = new SP_DEVINFO_DATA();

bool res = SetupDiClassGuidsFromNameA(ClassName, ref guids[0], RequiredSize, ref RequiredSize);

if (RequiredSize == 0) {

return (string[]) devices.ToArray(typeof(string));

}

if (!res) {

guids = new Guid[RequiredSize];

res = SetupDiClassGuidsFromNameA(ClassName, ref guids[0], RequiredSize, ref RequiredSize);

if (!res || RequiredSize == 0) {

return (string[]) devices.ToArray(typeof(string));

}

}

UInt32 DeviceIndex = 0;

for (int i = 0; i < RequiredSize; i++) {

NewDeviceInfoSet = SetupDiGetClassDevsA(ref guids[i], 0, IntPtr.Zero, DIGCF_PRESENT);

if (NewDeviceInfoSet.ToInt32() == -1) {

if (!res) {

return (string[]) devices.ToArray(typeof(string));

}

}

while (true) {

DeviceInfoData.cbSize = 28;

DeviceInfoData.DevInst = 0;

DeviceInfoData.ClassGuid = System.Guid.Empty;

DeviceInfoData.Reserved = 0;

res = SetupDiEnumDeviceInfo(NewDeviceInfoSet, DeviceIndex, DeviceInfoData);

if (!res) {

SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);

break;

}

DeviceName.Capacity = MAX_DEV_LEN;

if (!SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet, DeviceInfoData,

SPDRP_FRIENDLYNAME, 0, DeviceName, MAX_DEV_LEN, IntPtr.Zero)) {

res = SetupDiGetDeviceRegistryPropertyA(NewDeviceInfoSet,

DeviceInfoData, SPDRP_DEVICEDESC, 0, DeviceName, MAX_DEV_LEN,

IntPtr.Zero);

if (!res) {

SetupDiDestroyDeviceInfoList(NewDeviceInfoSet);

return (string[]) devices.ToArray(typeof(string));

}

}

devices.Add(DeviceName.ToString());

DeviceIndex++;

}

}

return (string[]) devices.ToArray(typeof(string));

}

}

}