Problems with Tags as PChars

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Christian Kirchhoff

Posted: 03/13/2003 15:20:31

Hello,

I'm developing a kind of HTML Editor with a TRichViewEdit control. I've created

several special components which I insert into the Editor as Controls. I

set rvfoSaveControlsBody to false. The attributes of each control is stored

in the controls tag as a string. When reloading the document, the controls

are initialized according to the values in the tag string.

My problem: The tag strings are sometimes cut or damaged as if there is a

problem with the memory allocation. I use code like this:

> Props := HRPropsToPChar;

> TRichViewEdit.SetItemTag(ItemNo, Integer(StrNew(Props)));

Props is of type PChar and setup properly, e.g.

";Align=2;Size=5;PercentWidth=100;Shade=0;"

When I add the following code:

> ATag := TRichViewEdit(Parent).GetItemTag(ItemNo);

> ShowMessage('x' + PChar(ATag) + 'x');

I sometimes get results like

";Align=2;Size=5;PercentWidth=100;Shade=1¶=1& 0"

So the input for the SetItemTag procedure is correct, but after that the

tag string is broken sometimes. Thus I have problems initializing the controls

with the correct values, because the tag string is broken. Here is a snippet

of RVF code (only the "body" part). I've inserted 2 of my controls in the

document and an empty line between them:

-5 1 0 0 1 ;Align=2;Size=5;PercentWidth=100;Shade=0; 0

User_HR

0 1 0 0 0 ;Align=2;Size=5;PercentWidth=100;Shade=0;

-5 1 0 0 1 ;Align=2;Size=5;PercentWidth=100;Shade=1¶=1& 0

User_HR

----

WHat's strange is that one of the tags appears to be doubled, because as

you can see there are three tag strings, but I only have inserted two controls,

and the Name of the controls ("User_HR") correctly appears only two times

in the RVF code.

Do I have to do anything different? What could cause these problems?

Regards,

Christian Kirchhoff