WMI(Windows®Management Instrumentation ) 非常强大，它可以以数据库的形式查询你的电脑的软件和硬件，在它的数据库里面，时刻保存着最新的软件信息和硬件信息，因此你可以用WMI来检测CUP主频、温度，读取WINDOWS的进程.........
本文就介绍如何使用WMI读取USB设备的PID和VID码
procedure TForm1.Button2Click(Sender: TObject);
var
Locator: OleVariant;
WMI: OleVariant;
RET: OleVariant;
Enum: IEnumVariant;
Tmp: OleVariant;
Value: Cardinal;
begin;
Locator := CreateOleObject(’WbemScripting.SWbemLocator’);
WMI := Locator.ConnectServer(’.’, ’’, ’’, ’’);
Ret := WMI.ExecQuery(’SELECT * FROM Win32_USBHub’);//这里Win32_USBHub为检测项，详见下表
Enum:= IUnknown(RET._NewEnum) as IEnumVariant;
while (Enum.Next(1, Tmp, Value) = S_OK) do
begin
ShowMessage(Tmp.PNPDeviceID);//Tmp为检测到返回的数据集合，其中PNPDeviceID为集合中的对象，包含了PID和VID码
end;
end;
Win32_USBHub只是冰山一角，常用的还有以下
\"Win32_1394Controller\" ,
\"Win32_BaseBoard\" ,
\"Win32_Battery\" ,
\"Win32_BIOS\" ,
\"Win32_Bus\" ,
\"Win32_CacheMemory\" ,
\"Win32_CDROMDrive\" ,
\"Win32_CurrentProbe\" ,
\"Win32_DesktopMonitor\" ,
\"Win32_DeviceMemoryAddress\" ,
\"Win32_DiskDrive\" ,
\"Win32_DisplayConfiguration\" ,
\"Win32_DisplayControllerConfiguration\",
\"Win32_DMAChannel\" ,
\"Win32_Fan\" ,
\"Win32_FloppyController\" ,
\"Win32_FloppyDrive\" ,
\"Win32_HeatPipe\" ,
\"Win32_IDEController\" ,
\"Win32_InfraredDevice\" ,
\"Win32_IRQResource\" ,
\"Win32_Keyboard\" ,
\"Win32_MemoryArray\" ,
\"Win32_MemoryDevice\" ,
\"Win32_MotherboardDevice\" ,
\"Win32_NetworkAdapter\" ,
\"Win32_NetworkAdapterConfiguration\" ,
\"Win32_OnBoardDevice\" ,
\"Win32_ParallelPort\" ,
\"Win32_PCMCIAController\" ,
\"Win32_PhysicalMemory\" ,
\"Win32_PhysicalMemoryArray\" ,
\"Win32_PnPEntity\" ,
\"Win32_PointingDevice\" ,
\"Win32_PortableBattery\" ,
\"Win32_PortConnector\" ,
\"Win32_PortResource\" ,
\"Win32_POTSModem\" ,
\"Win32_PowerManagementEvent\" ,
\"Win32_Printer\" ,
\"Win32_PrinterConfiguration\" ,
\"Win32_PrintJob\" ,
\"Win32_Processor\" ,
\"Win32_Refrigeration\" ,
\"Win32_SerialPort\" ,
\"Win32_SerialPortConfiguration\" ,
\"Win32_SMBIOSMemory\" ,
\"Win32_SoundDevice\" ,
\"Win32_SystemEnclosure\" ,
\"Win32_SystemMemoryResource\" ,
\"Win32_SystemSlot\" ,
\"Win32_TapeDrive\" ,
\"Win32_TemperatureProbe\" ,
\"Win32_UninterruptiblePowerSupply\" ,
\"Win32_USBController\" ,
\"Win32_VideoConfiguration\" ,
\"Win32_VideoController\" ,
\"Win32_VoltageProbe\" ,
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