virtualtree i made some mistake

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eldonfsr:
Hello I trying to implement virtualtree on my app i follow the wiki and make test app running wood but at my app send me this error i don't know what was my mistake.
fassypart.pas(140,36) Warning: Comparison might be always true due to range of constant and expression

--- Code: Pascal [+][-]window.onload = function(){var x1 = document.getElementById("main_content_section"); if (x1) { var x = document.getElementsByClassName("geshi");for (var i = 0; i < x.length; i++) { x[i].style.maxHeight='none'; x[i].style.height = Math.min(x[i].clientHeight+15,306)+'px'; x[i].style.resize = "vertical";}};} ---Var tsql:Tsqlquery; Data: PLRegisterData; XNode: PVirtualNode; XNode := VSTPL.AddChild(nil); if VSTPL.AbsoluteIndex(XNode) > -1 then begin // this line error Data := VSTPL.GetNodeData(Xnode);// showmessage(inttoSTr(RxMPLNK.FieldByName('RxPLItem').AsInteger)); Data^.RxPLItem := ''; Data^.RxPlQty := RxMPLNK.FieldByName('RxPlQty').AsInteger; Data^.RxPlpnPartNumber := RxMPLNK.FieldByName('RxPnpartnumber').AsString; Data^.RxCurrentCost := 0.00; Data^.RxDetail := ''; Data^.RxTitle := ''; Data^.RxPlType := ''; end;
how to change that property or what is me mistake.

thanks

balazsszekely:
Hi eldonfsr,

--- Quote ---Warning: Comparison might be always true due to range of constant and expression
--- End quote ---
The result of the function VSTPL.AbsoluteIndex is a cardinal(longword), so the range is between 0..4294967295. Makes no sense to compare with -1.

eldonfsr:
Ok Thanks

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