[Lazarus] Iterate TStringToStringTree
Hi Is there a cleaner way to iterate TStringToStringTree? This is the codetoolsstructs version but the LCL version is almost the same. var MapToEdit: TStringToStringTree; Node: TAVLTreeNode; Item: PStringToStringTreeItem; begin ... Node:=MapToEdit.Tree.FindLowest; while Nodenil do begin Item:=PStringToStringTreeItem(Node.Data); // *** use Item^.Name and Item^.Value *** Node:=MapToEdit.Tree.FindSuccessor(Node); end; Regards, Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Regexp syntax
Hi any regexp gurus out there? For converter I need a regexp that matches a string starting with Tnt, not followed by LX and captures everything after Tnt. This actually works: ^Tnt([^L][^X].+) but I am sure it could be written in a cleaner way. Then there is another regexp that captures string after TntLX: ^TntLX(.+) and that is no problem. Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Iterate TStringToStringTree
On Tue, 15 Jun 2010 11:05:34 +0300 Juha Manninen juha.manni...@phnet.fi wrote: Hi Is there a cleaner way to iterate TStringToStringTree? This is the codetoolsstructs version but the LCL version is almost the same. With fpc 2.5.1 you could write an enumerator: http://wiki.lazarus.freepascal.org/for-in_loop var MapToEdit: TStringToStringTree; Node: TAVLTreeNode; Item: PStringToStringTreeItem; begin ... Node:=MapToEdit.Tree.FindLowest; while Nodenil do begin Item:=PStringToStringTreeItem(Node.Data); // *** use Item^.Name and Item^.Value *** Node:=MapToEdit.Tree.FindSuccessor(Node); end; Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Regexp syntax
On Tue, 15 Jun 2010 11:12:52 +0300 Juha Manninen juha.manni...@phnet.fi wrote: Hi any regexp gurus out there? For converter I need a regexp that matches a string starting with Tnt, not followed by LX and captures everything after Tnt. This actually works: ^Tnt([^L][^X].+) This would miss TIntLa and TIntaX but I am sure it could be written in a cleaner way. ^Tnt(([^L]|.[^X]).+) Then there is another regexp that captures string after TntLX: ^TntLX(.+) and that is no problem. Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Multiple editor windows bug
Hi List. I believe i have found a bug when using multiple editor windows in the most recent svn version. I can confirm this exists in both Win32 and Linux (GTk2), but I would like someone else to confirm this too: 1) Start a new project 2) Open a new/existing source file (could be any, eg. FileUtils) in the same editor window. 3) Right click on current editor windows, select Move to new Window 4) Select first editor windows again and open another source file (eg. Forms). 5) Now try to close this file again (using Ctrl+F4, right clicking, using the X... ) Now the tab page with the closed file should still be present, and opening any further file, closing then again leaves a long list of dangling pages. It is only possible to close these dangling pages again when editor window #2 is closed again. Kind regards, Torsten Bonde Christiansen. ps. if someone can confirm this I will create a bug report in mantis about this. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Functions, procedures etc for using Dbase3/4 files ... what are they in Lazarus? (I used XBase1 in Delphi 5)
On Tue, 2010-06-15 at 14:54 +1000, Peter E Williams wrote:
Hi All,
On Mon, 2010-06-14 at 17:37 +0200, Michael Van Canneyt wrote:
You may want to look at the TDBF component. I think the package is
called
lazdbf or dbflaz.
Michael.
On Mon Jun 14 18:00:51 CEST 2010, Howard Page-Clark wrote:
For a general introduction have a look at
http://wiki.lazarus.freepascal.org/Lazarus_Database_Tutorial
I have looked at this document
For using Tdbf have a look at
http://wiki.lazarus.freepascal.org/Lazarus_Tdbf_Tutorial
and printed out and read this one.
and I have studied the Address Example and the other database example.
// need changing 0.50.alpha
//(Sender as Taction).Enabled:=Active;
if (GetFieldByName('x1_pos') = str_x[1]) and
I cannot find what to change XBase1's GetFieldByName(string) function
to. It accepts a field name as a parameter and returns a string.
Dataset.FieldByName('fieldname').AsString;
// how do I do this
HexxData_DBF.UpdFieldStr('x' + inttostr(x) + '_left',
option_2_str(pattern1.option[x, 1]));
I cannot find what to change XBase1's UpdFieldStr(string, string)
function. The first parameter is the field name e.g. 'x1_left' and the
second parameter is a string value to assign to the first parameter.
Dataset.FieldByName('FieldName').AsString := NewValue;
HexxData_DBF.AppendBlank;
Is this how I append a blank record? The documents quoted above don't
mention appending a blank record.
Dataset.Append; nothing in between, so it's blank Dataset.Post;
HexxData_DBF_rec_no := HexxData_DBF.RecNo;
I need to get the record number and assign it to a longint
Using records numbers is evil! But it'll work in the tDbf (Dbase) case:
Rec_No := dataset.RecNo;
HexxData_DBF.GotoRecord(HexxData_DBF_rec_no); // ### needs changing
Then I need a Function to Goto the Record saved in the above assignment
Dataset.RecNo := Rec_No;
But you shouldn't use that. Use bookmarks instead.
Joost.
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[Lazarus] Updating an app on the fly
To what extent could a Lazarus app replace itself with a new version without interruption? For example, if the main form had a menu at the top, synedit with popups and a status bar at the bottom, presumably much of the intelligence could be moved into dll/so libraries which could be closed and reopened. Would the dynamic libraries be able to get at properties (e.g. main menu) of the visible components? Would they be able to display forms and dialogs on their own account? -- Mark Morgan Lloyd markMLl .AT. telemetry.co .DOT. uk [Opinions above are the author's, not those of his employers or colleagues] -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Regexp syntax
but I am sure it could be written in a cleaner way. ^Tnt(([^L]|.[^X]).+) Hmmm... It doesn't look very clean. It may be more correct but I am not sure of that. Does [^L]|.[^X] mean: anything but 'L' or anything, followed by anything but 'X' ? Juha -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Regexp syntax
On Tue, 15 Jun 2010 15:21:52 +0300 Juha Manninen juha.manni...@phnet.fi wrote: but I am sure it could be written in a cleaner way. ^Tnt(([^L]|.[^X]).+) Hmmm... It doesn't look very clean. It may be more correct but I am not sure of that. It is not very clean. It does not match TntL and TntL1. Does [^L]|.[^X] mean: anything but 'L' or anything, followed by anything but 'X' ? The pipe is like an 'or' operator. [^L]|.[^X] means: Any character but L OR any character followed by any character but X. It matches a, b, La, Lb, but not LX and not L. Even better regexp is: ^Tnt(([^L]|L[^X]).*|L$) Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Regexp syntax
^Tnt(([^L]|.[^X]).+) Hmmm... It doesn't look very clean. I don't think *any* regex looks clean. ;-) -- Regards, - Graeme - ___ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Iterate TStringToStringTree
On 15/06/2010, Juha Manninen wrote: Is there a cleaner way to iterate TStringToStringTree? This is the codetoolsstructs version but the LCL version is almost the same. With any FPC version your can simply create a new Iterator descendant. See the link below for a description. The code is included in the article mentioned. http://www.mail-archive.com/fpc-de...@lists.freepascal.org/msg15082.html -- Regards, - Graeme - ___ fpGUI - a cross-platform Free Pascal GUI toolkit http://opensoft.homeip.net/fpgui/ -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Regexp syntax
On Tue, Jun 15, 2010 at 23:55, Mattias Gaertner nc-gaert...@netcologne.de wrote: On Tue, 15 Jun 2010 15:21:52 +0300 Juha Manninen juha.manni...@phnet.fi wrote: but I am sure it could be written in a cleaner way. ^Tnt(([^L]|.[^X]).+) Hmmm... It doesn't look very clean. It may be more correct but I am not sure of that. It is not very clean. It does not match TntL and TntL1. Does [^L]|.[^X] mean: anything but 'L' or anything, followed by anything but 'X' ? The pipe is like an 'or' operator. [^L]|.[^X] means: Any character but L OR any character followed by any character but X. It matches a, b, La, Lb, but not LX and not L. Even better regexp is: ^Tnt(([^L]|L[^X]).*|L$) The correct (and clean) answer is actually: ^Tnt(?!LX)(.+)$ Sadly, assertions are poorly supported by many languages/libraries. Use Perl if you want the full power of regexps ;-) -- Alexander S. Klenin -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Regexp syntax
Mattias Gaertner schrieb: Even better regexp is: ^Tnt(([^L]|L[^X]).*|L$) I wonder who will be able to understand and update such expressions, at any later time. To me it looks like typical write-only code :-( DoDi -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Rotated Text for Label or Panel
Is there a component that offers rotated text drawn on component like TLabel or TPanel? Rotation via the orientation property on the font object does not seem to work (at least on the Windows 7 box I'm presently on). Anyone have something that works within LCL? Thanks. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Rotated Text for Label or Panel
On Tue, 15 Jun 2010 14:20:59 -0500 Andrew Brunner andrew.t.brun...@gmail.com wrote: Is there a component that offers rotated text drawn on component like TLabel or TPanel? Feel free to improve TLabel and TPanel to support that. Rotation via the orientation property on the font object does not seem to work (at least on the Windows 7 box I'm presently on). Rotating text works. Just TLabel and TPanel don't support it. Anyone have something that works within LCL? Mattias -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
[Lazarus] Accessing WinControls from DLL
I believe that 'writing' (without syncronization) to a TWinControl from a thread or dll function is BAD(tm), but just wondering if the same applies to 'reading' (properties / etc) ? another way - can 'non-mainthread' access to WinControls be considered 'ReadOnly' Thanks - SteveG -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
Re: [Lazarus] Functions, procedures etc for using Dbase3/4 files ... what are they in Lazarus? (I used XBase1 in Delphi 5)
Hi Joost All,
On Tue, 2010-06-15 at 11:40 +0200, Joost van der Sluis wrote:
On Tue, 2010-06-15 at 14:54 +1000, Peter E Williams wrote:
On Mon Jun 14 18:00:51 CEST 2010, Howard Page-Clark wrote:
For a general introduction have a look at
http://wiki.lazarus.freepascal.org/Lazarus_Database_Tutorial
I have looked at this document
For using Tdbf have a look at
http://wiki.lazarus.freepascal.org/Lazarus_Tdbf_Tutorial
Dataset.FieldByName('fieldname').AsString;
Dataset.FieldByName('FieldName').AsString := NewValue;
Dataset.Append; nothing in between, so it's blank Dataset.Post;
Dataset.RecNo := Rec_No;
I have spent all morning making those changes. Thank you,
Joost !!! :-)))
But you shouldn't use that. Use bookmarks instead.
Do you have a url for a tutorial about bookmarks or some sample code? I
would really appreciate it.
Joost.
Peter
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Re: [Lazarus] Regexp syntax
Hans-Peter Diettrich schrieb: ^Tnt(([^L]|L[^X]).*|L$) I wonder who will be able to understand and update such expressions, at any later time. To me it looks like typical write-only code :-( Yes, I also never got accustomed to regex syntax. But I know that some are using it frequently. And only then you will be able to manage such special character monsters I think. -- ___ Lazarus mailing list Lazarus@lists.lazarus.freepascal.org http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
