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 ObjUserData with IEV_NEXT_INSERTED_OBJECT		  New Topic  Reply to Topic
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c.basso

Italy
36 Posts
Posted - Jun 23 2015 :  12:11:19  Show Profile  Reply
Hi,
after seeing UserDataVect demo,
I'm trying to put data on my next inserted object,
like this:

>> This is my user data
type
TMyData=record
text1:string[255];
text2:string[255];
end;
PMyData=^TMyData;

>> On my button click event
GetMem(vUserData, SizeOf(tmydata));
vUserData^.text1:= 'hello';
vUserData^.text2:= 'hello';
ctrlImageEnVect.ObjUserData[IEV_NEXT_INSERTED_OBJECT]:= vUserData;
ctrlImageEnVect.ObjUserDataLength[IEV_NEXT_INSERTED_OBJECT]:= SizeOf(TMydata);
ctrlImageEnVect.MouseInteract:= [];
ctrlImageEnVect.MouseInteractVt:= [miPutLine];
ctrlImageEnVect.Cursor:= crIEPencil;

>> On my AfterDrawObject event
var
vUserData: PMyData;
begin
vUserData:= ctrlImageEnVect.ObjUserData[hobj];
if (vUserData <> nil) then
begin
>>> NEVER FIRED, vUserData is always nil
end;

What I'm doing wrong?

Thanks

Claudio

klausdoege

Germany
389 Posts
Posted - Jun 24 2015 :  04:45:59  Show Profile  Reply
Hi,

have you create a new Object ?
with: ImageEnVect.AddNewObject;


Klaus
www.klausdoege.de
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c.basso

Italy
36 Posts
Posted - Jun 24 2015 :  04:50:49  Show Profile  Reply
When I must create the object?

The object is created using mouse, as:
ctrlImageEnVect.MouseInteractVt:= [miPutLine];

I expect that using IEV_NEXT_INSERTED_OBJECT,
after the user creates the line with mouse,
in AfterDrawObject the object must have the userdata.

It's not like this?

Claudio
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xequte

38510 Posts
Posted - Jun 24 2015 :  22:27:18  Show Profile  Reply
Hi

I'm not sure this is the best way to do it as there is real risk of memory leak. You would be better to set it in the OnNewObject event.


Nigel
Xequte Software
www.xequte.com
nigel@xequte.com
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