Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

Getting properties with typinfo.pas

Posted on 1998-04-23
4
Medium Priority
?
519 Views
Last Modified: 2013-11-23
I have an object, of unknown type.  I want a list of the published property names.  To get the number of items, I use:

nProps := GetTypeData(MyObject.ClassInfo)^.PropCount;

I get each property name with:

  GetPropInfos(Source.ClassInfo,SourceProps);
  for PropNo := 0 to nProps-1 do begin
    PropertyName:= (SourceProps[PropNo])^.Name;

This works for all properties except record types (eg TRect).  They're just not included in the list, or the count of properties....

Any ideas?


0
Comment
Question by:bcrotaz
  • 2
  • 2
4 Comments
 
LVL 1

Accepted Solution

by:
extreme earned 100 total points
ID: 1336754
That's because propinfo works only with the published properties of objects. And with properties that *can* be published, records, the same as other types, don't works with typeinfo. Try to put a record published, then register the component with Delphi and look in the object inspector. Doesn't works. If you need something that has fields you have to use a class, like TFont for example. If you need this for a record like TRect, build a class with the same fields of TRect and if you want you can add it some methods to give it more functionality.
0
 
LVL 1

Author Comment

by:bcrotaz
ID: 1336755
OK. That's disappointing.  I'll have to find a workaround.
I originally used a class - it's for a date-time type thing.
The class had the DateToStr etc methods.
I found I got access violations all over the place.
I'll look at how TFont is used.
0
 
LVL 1

Expert Comment

by:extreme
ID: 1336756
You can't use TDateTime for that? TDateTime is a floating point value, that is perfectly compatible with published properties and RTTI. Of course if you want to split it in fields you have to use a class.
0
 
LVL 1

Author Comment

by:bcrotaz
ID: 1336757
No - I need frames too.
I did it with a Longint.
0

Featured Post

Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
We’ve all felt that sense of false security before—locking down external access to a database or component and feeling like we’ve done all we need to do to secure company data. But that feeling is fleeting. Attacks these days can happen in many w…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …
Suggested Courses

810 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question