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POHow to fast copy from hash to listview?
 

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  1. POHow to fast copy from hash to listview?
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    <p>There is a hash pas file <a href="http://gpdelphiunits.googlecode.com/svn-history/r4/trunk/src/GpStringHash.pas" rel="nofollow">http://gpdelphiunits.googlecode.com/svn-history/r4/trunk/src/GpStringHash.pas</a></p> <p>We can create hash and add key - value </p> <p>Question 1: We want to know how to iterate key - value and copy data to listview.</p> <p>Question 2: is there a way to fast copy like assign method to it?</p> <p>Thank you very much in advance.</p> <p>Dear gabr, Thank you so much for your immediate reply and your hash file. Is there doc or help files or examples or demo for your code ? Thank you so much again. </p> <hr> <p>Just test, I do not know where i did wrong Thank you so much. I just used your code but there is the following error prompt. Or I made some mistakes:</p> <pre><code>procedure TForm8.ab; var a: TGpStringHash; i,j, fr:integer; k: string; enlist: TGpStringHashenumerator; kv: TGpStringHashKV; begin a:=TGpStringHash.Create; kv:=TGpStringHashKV.Create; enlist:= TGpStringHashenumerator.Create(a); for j:=1 to 10 do begin if a.HasKey(inttostr(j)) then begin fr:=a.ValueOf(inttostr(j)); a.Update(inttostr(j),fr+1); end else begin a.Add(inttostr(j),1); end; end; for i:=0 to a.Count -1 do begin kv:=enlist.GetCurrent; memo1.Lines.Add(kv.Key + inttostr(kv.value) ); end; end; /// Division by Zero ERROr ///FindBucket(const key: string): cardinal; </code></pre> <p>ANSWER: You're using enumerator improperly. Don't instantiate it in front and always use MoveNext to move to the next element.</p> <pre><code>// fill 'a' as above enlist := TGpStringHashenumerator.Create(a); while enList.MoveNext do begin kv:=enlist.GetCurrent; memo1.Lines.Add(kv.Key + inttostr(kv.value) ); end; </code></pre>
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    1. USDylan
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    1. CODon't use TGpStringHash's parameterless constructor. Allways pass at least the initial number of elements in the hash to the Create.
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    2. COOr is that due to different delphi version?
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    3. COWe change Create constructor to: a:=TGpStringHash.Create (num, true);//with param. There is no error prompt, but memo1 generates the same data: they are all '-1'. Please let us know how to change.
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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