Question

我正在制作一个应用程序，需要列出机器中所有具有IO地址的LPT端口。（即它的输出：LPT1 [开始;结束] ....）

使用WMI，您可以获取此信息..来自Win32_ParallelPort的名称/编号以及来自Win32_PortResource的地址。

问题是我不知道如何将portname与其地址相关联。

Answer 1

您必须查询三次并循环结果才能从ParallelPort，PnPAllocatedResource和PortResource获取匹配的记录。以下代码正是如此：

var parallelPort = new ManagementObjectSearcher("Select * From Win32_ParallelPort");
//Dump(parallelPort.Get());
foreach (var rec in parallelPort.Get())
{     
    var wql = "Select * From Win32_PnPAllocatedResource";
    var pnp = new ManagementObjectSearcher(wql);

    var searchTerm = rec.Properties["PNPDeviceId"].Value.ToString();
    // compensate for escaping
    searchTerm = searchTerm.Replace(@"\", @"\\");

    foreach (var pnpRec in pnp.Get())
    {
        var objRef = pnpRec.Properties["dependent"].Value.ToString();
        var antref = pnpRec.Properties["antecedent"].Value.ToString();  

        if (objRef.Contains(searchTerm))
        {
            var wqlPort = "Select * From Win32_PortResource";
            var port = new ManagementObjectSearcher(wqlPort);
            foreach (var portRec in port.Get())
            {
                if (portRec.ToString() == antref)
                { 
                    Console.WriteLine( "{0} [{1};{2}]",
                        rec.Properties["Name"].Value,
                        portRec.Properties["StartingAddress"].Value, 
                        portRec.Properties["EndingAddress"].Value );
                }
            }
        }
    }
}

C＃+ WMI + LPT帮助！

1 个答案: