C# + WMI + LPT帮助！

Question

我正在编写一个应用程序，它需要列出机器中的所有LPT端口及其IO地址。(即输出: LPT1 starting；Ending....)

使用WMI，您可以获取此信息。Win32_ParallelPort的名称/编号和Win32_PortResource的地址。

问题是我不知道如何将portname与它的地址关联起来。

Answer 1

您必须查询三次并遍历结果，才能从ParallelPort、PnPAllocatedResource和PortResource获得匹配的记录。下面的代码就是这样做的：

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 );
                }
            }
        }
    }
}