BCB版的串口枚举2

又无意中看到 MFC实现的串口通信助手中的一段枚举串口代码，拿过来几乎不改动就可以在bcb6.0里运行了，可是会显示个Com0 出来，断点测试原程序有个小bug，见如下：

OSVERSIONINFO osvi;
osvi.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
BOOL bGetVer = GetVersionEx(&osvi);
if(bGetVer && (osvi.dwPlatformId == VER_PLATFORM_WIN32_NT))
{
    //Use QueryDosDevice to look for all devices of the form COMx. This is a better
    //solution as it means that no ports have to be opened at all.
    TCHAR szDevices[65535];
    DWORD dwChars = QueryDosDevice(NULL, szDevices, 65535);
    if(dwChars)
    {
        int i=0;
        for(;;)
        {
            //Get the current device name
            TCHAR *pszCurrentDevice = &szDevices[i];
            //If it looks like "COMX" then
            //add it to the array which will be returned
            int nLen = _tcslen(pszCurrentDevice);
            if(nLen > 3 && _tcsnicmp(pszCurrentDevice, _T("COM"), 3) == 0)
            {
                //Work out the port number
                int nPort = _ttoi(&pszCurrentDevice[3]);
                if(nPort>0)//原本这里不判断nPort会有bug，误把"CompositBarterry"匹配进来
                    Memo1->Lines->Add("COM"+String(nPort));
                //ports.Add(nPort);
            }
            // Go to next NULL character
            while(szDevices[i] != _T('\0'))
                i++;
            // Bump pointer to the next string
            i++;
            // The list is double-NULL terminated, so if the character is
            // now NULL, we're at the end
            if(szDevices[i] == _T('\0'))
                break;
        }
    }
    //else
    //  TRACE(_T("Failed in call to QueryDosDevice, GetLastError:%d\n"), GetLastError());
}

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