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Shortened pathname with \...\

Posted on 1998-09-03
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Last Modified: 2010-08-05
How do I shorten pathnames to fit a certain length space using an ellipsis (...) between backslashes?
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Question by:rclay
6 Comments
 
LVL 10

Expert Comment

by:viktornet
ID: 1338552
How about something similar to this.,.....

var
  Path : string;
procedure TForm1.Button1Click(Sender: TObject);
begin
  if Length(path) > 10 then
    Path := Copy(path, 1, 10) + '\...\';
  Caption := Path;
end;
procedure TForm1.Button2Click(Sender: TObject);
begin
  Path := 'C:\windows\desktop\Viktor\Delphi';
  Caption := Path;
end;

Hope it helps! There are other ways to do that with the API, but it's not exactly what you are looking for     it does like this  C:\windows\desktop\vik...  and not C:\windows\desktop\vik\...\...\and so on.....

Regards,
Viktor Ivanov
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LVL 7

Expert Comment

by:BlackMan
ID: 1338553
If you want to do it the "Windows Way", let me know and I'll show you how to do it..
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Author Comment

by:rclay
ID: 1338554
Viktornet: What I'm looking for is a function or procedure that shortens the path by omitting its middle part, substituting an ellipsis. But it would break the pathname at a '\', not at some arbitrary point such as at the 10th character. Also the total length of the resulting pathname should be adjustable at design- or run-time by the programmer.

Blackman: Yes, I would like to know how to do it the windows way.
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LVL 5

Expert Comment

by:JimBob091197
ID: 1338555
Hi

The DrawTextEx API function will fill in the ellipsis for you.  You give the function a string (PChar), a rectangle and a canvas, and if the text doesn't fit into the rectangle then it uses ellipsis.

E.g.
DrawTextEx(Canvas.Handle, PChar(SomeStr), Length(SomeStr), SomeRect, DT_PATH_ELLIPSIS or DT_MODIFYSTRING, nil);

Unfortunately you don't get the result string (with ellipsis) back.

JB
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LVL 7

Accepted Solution

by:
BlackMan earned 100 total points
ID: 1338556
Here's an example (taken from a "live" application). It takes the value of AString and shorten it so that it fits in Label1.

Var
  AString: String;
  r: TRect;
begin
  AString := '\\MyServer\MyShare\ThisDirectory\ThatDirectory\MyFile';
  r.Left := 0;
  r.Right := Label1.Width;
  r.Top := 0;
  r.Bottom := Label1.Height;
  Windows.DrawText(Label1.Canvas.Handle, @AString[1], Length(AString), r, DT_Left or DT_PATH_ELLIPSIS or DT_MODIFYSTRING or DT_CALCRECT );
  Label1.caption := AString;
End;
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Author Comment

by:rclay
ID: 1338557
Thanks for the input Viktornet, JimBob, and BlackMan!
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