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    <p>Your code is not working because you are passing a double-quote in the WMI class name.</p> <p>change this code</p> <pre><code>GetWMIstring('','Win32_DiskDrive"','SerialNumber'); </code></pre> <p>To this</p> <pre><code>GetWMIstring('','Win32_DiskDrive','SerialNumber'); </code></pre> <p>Btw, you can improve a lot your WMI function (GetWMIstring) if you follow the recommendations of the answer to this question <a href="https://stackoverflow.com/questions/10199531/how-can-i-improve-the-wmi-performance-using-delphi/10199841#10199841"><code>How can I improve the WMI performance using delphi?</code></a>.</p> <p>Try this sample (this code use late binding and don't need the <code>WbemScripting_TLB</code> unit)</p> <pre><code> uses ActiveX, ComObj; var FSWbemLocator : OLEVariant; FWMIService : OLEVariant; function GetWMIstring(const WMIClass, WMIProperty:string): string; const wbemFlagForwardOnly = $00000020; var FWbemObjectSet: OLEVariant; FWbemObject : OLEVariant; oEnum : IEnumvariant; iValue : LongWord; begin; Result:=''; FWbemObjectSet:= FWMIService.ExecQuery(Format('Select %s from %s',[WMIProperty, WMIClass]),'WQL',wbemFlagForwardOnly); oEnum := IUnknown(FWbemObjectSet._NewEnum) as IEnumVariant; if oEnum.Next(1, FWbemObject, iValue) = 0 then if not VarIsNull(FWbemObject.Properties_.Item(WMIProperty).Value) then Result:=FWbemObject.Properties_.Item(WMIProperty).Value; FWbemObject:=Unassigned; end; procedure TForm4.Button1Click(Sender: TObject); var x:string; Y:string; begin FSWbemLocator := CreateOleObject('WbemScripting.SWbemLocator'); FWMIService := FSWbemLocator.ConnectServer('localhost', 'root\CIMV2', '', ''); X:=GetWMIstring('Win32_BIOS','SerialNumber'); Y:=GetWMIstring('Win32_PhysicalMedia','SerialNumber'); ShowMessage(x+';'+y); end; </code></pre>
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    1. POGet Real HDD Serial Number with Delphi
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    1. CO+1. Good eye! That extra `"` was hard to spot before you pointed it out. :-)
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      1. USKen White
    2. COthanks very much for quick response , i have remove the double-quote from the class i didn't notice it but it still return not found and about , improve it for delphi console i don't know how to convert it to delphi app
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      1. USAnajehad Walaa
    3. COMaybe you are using Windows XP? the MSDN [documentation](http://msdn.microsoft.com/en-us/library/windows/desktop/aa394132%28v=vs.85%29.aspx) about this property (SerialNumber) says `..Windows Server 2003, Windows XP, Windows 2000, and Windows NT 4.0: This property is not available. `
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