我有以下过程来运行WMI查询,并且它工作得非常好。如何获取WbemScripting查询返回的列的名称?
procedure TFormMain.GetWMIOSInfo(const RemoteMachine, Username, Password: string);
var
FSWbemLocator: OLEVariant;
FWMIService: OLEVariant;
FWbemObjectSet: OLEVariant;
FWbemObject: OLEVariant;
oEnum: IEnumvariant;
iValue: LongWord;
begin;
try
FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator');
FWMIService := FSWbemLocator.ConnectServer(RemoteMachine, 'root\CIMV2', Username, Password);
FWbemObjectSet := FWMIService.ExecQuery(
'select screenwidth, screenheight, status from Win32_DesktopMonitor','WQL', 0);
try
oEnum := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
while oEnum.Next(1, FWbemObject, iValue) = 0 do
begin
Listbox1.Items.Add(
VarToStr(FWbemObject.availability) + ', ' +
VarToStr(FWbemObject.screenwidth) + ', ' +
VarToStr(FWbemObject.screenheight));
FWbemObject := Unassigned;
end;
finally
FWbemObjectSet := Unassigned;
end;
Except on E: Exception do
Raise;
end;
end;
我想更改查询以返回所有字段,如select * from Win32_DesktopMonitor
。我的问题是,我不知道如何确定FWbemObject
中查询返回的列的名称。即。我想列举FWbemObject
中的列。
Listbox1.Items.Add(
VarToStr(FWbemObject.<?>) + ', ' +
VarToStr(FWbemObject.<?>) + ', ' +
....
VarToStr(FWbemObject.<?>));
有关所列属性的含义,请查看[Win32_DesktopMonitor](http://msdn.microsoft.com/zh-cn/library/aa394122.aspx)官方文档。 – jachguate 2011-03-02 17:35:40
这是“未分配的”语句是否真的有必要?我认为OleVariant会在函数结束时自动完成。 – 2011-03-02 17:56:41
Rob,在这种情况下,因为代码是'if oEnum.Next(1,FWbemObject,iValue)= 0 then',但是如果你使用类似'while oEnum.Next(1,FWbemObject,iValue)= 0'需要设置为'Unassigned'来避免循环内存泄漏。 – RRUZ 2011-03-02 18:01:32