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Jens Larsen · Guest

The following code takes ca minute to complete.

// Header file
TWinControl * Parent;

// Source file
__fastcall MyThread::MyThread(bool CreateSuspended, TWinControl *
parent)
: TThread(CreateSuspended), Parent(parent)
{

}

void __fastcall MyThread::Execute(){
for (int i = 0; i < 1000; i++)
{
TStringGrid * a = new TStringGrid(Parent); // owner
a->Parent = this->Parent; // comment out candidate
}
}

If I comment out the line with Parent assignment (in the Execute
method), the execution time falls to 0.5 second. The MyThread object is
created using a form's this-variable as parameter.

To my understanding, a VCL object uses it's Parent as a reference for
position. A VCL object's owner (in the constructor above) is
responsible for deletion. I make use of both attributes later on.

Is there a simple explanation for this behaviour? What can I do about
it?

C++ Builder 6 Pro

Thanks