Board index » cppbuilder » Re: enhance my app

2005-02-02 06:13:30 PM
cppbuilder75
"JD" < XXXX@XXXXX.COM >wrote in message
Try this with a TListBox and a TButton's events also connected.
// -------------
void __fastcall TForm1::EditEnter(TObject *Sender)
{
TEdit* p = static_cast<TEdit*>(Sender);
p->Color = clYellow;
p->Text = "Test"; // *???*
}
// -------------
void __fastcall TForm1::EditExit(TObject *Sender)
{
TEdit* p = static_cast<TEdit*>(Sender);
p->Color = clWhite;
}
// ------------
It compiles and runs, and does not throw any exceptions, so what is
happening on the 'test' line for the other controls?
neither
ListBox1->Text = "Test";
nor
Button1->Text = "Text";
compiles.
With the colour changes the mistake may be obvious, but in other cases it
may not. Accidentally connect up a TImage's event, and you get AV's, which
you need to discover while testing.
When I do share event handlers, it is often with different control types, so
using dynamic_cast has become a habit for me anyway (right or wrong).
Simon.
 

JD wrote:
functions from the TEdits. that's why i can't do just one OnExit-function.