在 Windows 上检测所有可用串行端口的正确方法是什么?

问题描述

有几种方法可以在 Windows 下列出串行端口，但我不确定什么是正确的方法:检测所有可用串行端口的方法.

There are several ways to list serial ports under Windows but I'm not sure what is the proper way: the way that does detect all serial ports that are available.

一个很好的代码示例是 http://www.naughter.com/enumser.html- 有 9 种(九种！)枚举串行设备的方法.

One good code example is http://www.naughter.com/enumser.html - where there are 9 (nine!) ways of enumerating serial devices.

问题是:最佳的做法是什么.

The question is: what is the optimal way of doing it.

要求:

• 不打开端口以检查它们是否可用.
• 能够检测与 COMx 名称不同的端口.
• 在 Windows XP SP2 或更高版本上工作

推荐答案

void SelectComPort() //added function to find the present serial
{

    TCHAR lpTargetPath[5000]; // buffer to store the path of the COMPORTS
    DWORD test;
    bool gotPort=0; // in case the port is not found

    for(int i=0; i<255; i++) // checking ports from COM0 to COM255
    {
        CString str;
        str.Format(_T("%d"),i);
        CString ComName=CString("COM") + CString(str); // converting to COM0, COM1, COM2

        test = QueryDosDevice(ComName, (LPSTR)lpTargetPath, 5000);

            // Test the return value and error if any
        if(test!=0) //QueryDosDevice returns zero if it didn't find an object
        {
            m_MyPort.AddString((CString)ComName); // add to the ComboBox
            gotPort=1; // found port
        }

        if(::GetLastError()==ERROR_INSUFFICIENT_BUFFER)
        {
            lpTargetPath[10000]; // in case the buffer got filled, increase size of the buffer.
            continue;
        }

    }

    if(!gotPort) // if not port
    m_MyPort.AddString((CString)"No Active Ports Found"); // to display error message incase no ports found

}

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