您是否知道为什么代码块会在某些计算机上否定“无法将类型变量(Null)转换为类型(OleStr)”,而不是所有这些计算机都会生成错误消息。无法将类型变量(Null)转换为类型(OleStr)
function GetWMIstringSW(const WMIClass, WMIProperty:string): string;
const
wbemFlagForwardOnly = $00000020;
var
FWbemObjectSet: OLEVariant;
FWbemObject : OLEVariant;
oEnum : IEnumvariant;
iValue : LongWord;
LNode : TTreeNode;
LNode2 : TTreeNode;
begin
Result:='';
FWbemObjectSet:= FWMIService.ExecQuery(Format('Select %s from %s',[WMIProperty, WMIClass]),'WQL',wbemFlagForwardOnly);
oEnum := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant;
while oEnum.Next(1, FWbemObject, iValue) = 0 do
begin
if not VarIsNull(FWbemObject.Properties_.Item(WMIProperty).Value) then
Result:=FWbemObject.Properties_.Item(WMIProperty).Value;
LNode := ClientForm.TreeView1.Items.AddChild(Node, Format('%s',[String(FWbemObject.Name)]));
LNode2 := ClientForm.TreeView1.Items.AddChild(LNode, Format('%s',[String(FWbemObject.Version)]));
FWbemObject:=Unassigned;
end;
end;
的功能,然后在FORMCREATE执行:
GETWMIstringSW('Win32_Product','Name');
非常感谢你的帮助。
将变异为空? – 2013-04-25 21:35:36
为什么不使用准备好的'MagWMI'包装? – 2013-04-26 10:30:23