Posted by jpluimers on 2018/04/24
So I won’t forget to check these out:
Via [WayBack] I like programming in Delphi, but I don’t particularly like writing applications that work with database backends… – Thomas Mueller (dummzeuch) – Google+ (thanks Stefan Glienke)
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Posted by jpluimers on 2018/04/24
Thomas Pfister came with a nice solution to this question:
[WayBack] Does anyone know how to embed a superscript Registered symbol in a Rave memo buffer? – Phillip Woon – Google+
Since Google has such bad indexing of G+, here is the solution:
procedure TForm4.RvSystem1Print(Sender: TObject);
const
SuperscriptOn = RPTFPrefix + RPTFSuperscript + RPTFOn + RPTFSuffix; // from RpDefine.pas
SuperscriptOff = RPTFPrefix + RPTFSuperscript + RPTFOff + RPTFSuffix;
var
MemoBuf: TMemoBuf;
begin
MemoBuf := TMemoBuf.Create;
try
MemoBuf.Text := 'Test' + SuperscriptOn + '®' + SuperscriptOff + ' Test';
MemoBuf.PrintStart := 0.5;
MemoBuf.PrintEnd := 8.0;
with Sender as TBaseReport do begin
PrintMemo(MemoBuf, 1, true);
end;
finally
FreeAndNil(MemoBuf);
end;
end;
–jeroen
Source: Does anyone know how to embed a superscript Registered symbol in a Rave memo …
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Posted by jpluimers on 2018/04/19
I knew that methods on interfaces were not compatible with the procedure of object (like [WayBack] TProc)or function of object construct, but they are also not compatible with the reference to procedure or reference to function construct.
Via: [WayBack] I try to call an Interface method from TThread.Syncrhonize()…and Berlin don’t accept that… – Paul TOTH – Google+
If you want it fixed, vote for [RSP-13007] Interface methods are not assignable to anonymous method variable – Embarcadero Technologies (Thanks Stefan Glienke).
You can work around it with an anonymous method.
This won’t work:
program Project1;
{$APPTYPE CONSOLE}
uses
SysUtils;
type
ITest = interface
['{B5AD87E8-A3DF-4B83-BE14-997C2E76A06C}']
procedure Run;
end;
TTest = class(TInterfacedObject, ITest)
procedure Run;
end;
procedure TTest.Run;
begin
Writeln('PASS')
end;
var
test: ITest; // <- change this to TTest and it compiles
proc: TProc;
begin
test := TTest.Create;
proc := procedure begin test.Run; end; // <- this compiles
proc := test.Run; // E2010 Incompatible types: 'TProc' and 'procedure, untyped pointer or untyped parameter'
proc();
Readln;
end.
–jeroen
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Posted by jpluimers on 2018/04/18
Reminder to self that I one day need to write more about this enumerator:
[WayBack] jeroenp / BeSharp.net / source / Native / Delphi / Library / Data / DataSetEnumeratorUnit.pas — Bitbucket
It’s not nearly as good as the one by Uwe Raabe, but I didn’t really update this code for about a decade as it has functioned well for me in the current state: in 2009 it was like [WayBack] bo library – Source Code.
Code by Uwe is at [WayBack] Dataset Enumerator Reloaded | The Art of Delphi Programming via [WayBack] Refurbishing old code: http://www.uweraabe.de/Blog/2017/02/09/dataset-enumerator-reloaded/ – Uwe Raabe – Google+
A couple of years ago I wrote a two-part article about a dataset enumerator: A Magical Gathering – Part 1 and Part 2. Well, things evolved a bit since then and I wondered how one would implement something similar given the current features of Delphi. Actually I am following here a suggestion from commenter Alan Clark.
So for now it’s just to document that my enumerator is there and that it works as intended.
I referenced an older version at [WayBack] For-in Enumeration – ADUG as I used it at Spoken @ CodeRage III, December 1-5, 2008 on Delphi, database and XML related topics and Source: Conferences/2009/DelphiLive.2009/Smarter-code-with-databases-and-data-aware-controls.
A small video on how you use it is here:
It was back when Better Office and CodeGear still existed and we celebrated (late) Gwan Tan’s 50th birthday.
O the days (:
More history:
–jeroen
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Posted by jpluimers on 2018/04/12
[WayBack] I want to annotate some of my enumerated types with human facing names. So I want to write: type[Names(‘Explicit time domain’, ‘Implicit time domain’,… – David Heffernan – Google+
This does not work:
constructor Create(const Values: array of string);
It seems to be in QC.
The reason is not obvious until you realise (thanks Stefan for wording that) that attribute constructor arguments are limited to anything that can be const. Open arrays nor dynamic arrays can be const (yes, nowadays you can have “consts” that are dynamic arrays but in fact they are compiler protected variables).
An alternative you might think works, but fails us using one attribute per enumeration element. But that’s where Delphi RTTI leaves you in the dark: it does not expose the RTTI for enumeration elements (likely doesn’t even generate it), only the the enumeration type itself.
So this fails:
type
NameAttribute = class( TCustomAttribute )
private
FName: String;
public
constructor Create( AName : String );
property Name: String read FName;
end;
TMyEnumeration = (
[Name('One')]
meOne,
[Name('Two')]
meTwo
);
–jeroen
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