Thread: Insert TMemo on my Form ????

You need to attach your TMemo object to the form.

I.e.

void __fastcall TBagground::testbuttonClick(TObject *Sender)
{
TMemo *memo1 = new TMemo(TBagground);


memo1->Parent = TForm1;

memo1->Left = 100;
memo1->Top = 500;

}


Also, note your argument in the constructor was incorrect. For VCL objects, the constructor argument is the object which owns the object - The Owner. The Owner is the object responsible for destroying the owned object. This is different to the Parent. The Parent is the visual object on which the newly created object appears.

When creating a new VCL object, you can pass it NULL if you prefer. Whatever you do, you need to ensure that you destroy the object explicitly. This is different to dragging & dropping object at design time, in which case the compiler ensures this is done by default.

Also check object the Controls property of TControl objects.

Hi tx for answering.

It worked allmost.

There are the only changes I made to your answer...

void __fastcall TBagground::testbuttonClick(TObject *Sender)
{
TMemo *memo1 = new TMemo(Bagground); // not TBagground ??


memo1->Parent = TForm1; // Bagground, not TForm1...

memo1->Left = 100;
memo1->Top = 500;

}


But that should be the same for all objects I need to insert in Runtime right ??

Gugge

Just ensure that you delete your new memo object, you will have a memory leak otherwise.

From your code, memo1 goes out of scope. How do you plan to delete it?

Every VCL object has a list of objects its owns, you could use this (I can't remember what the property is called from the top of my head). Also, every object has an Owner property - the value it was passed in the constructor. This is sometimes useful.