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Question
how to check if a form has been created in c++
Borland C++ Builder 5
How can I check if a Form has been created? if it exists?
Somewhere I do:
Form4 = new TForm4(this);
Meanwhile program is doing other stuff including displaying variables on Form4 but has to do this ONLY if Form4 exists.
Anyone can help me out?
Thanx.
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by: dede82Posted on 2003-04-03 at 18:36:40ID: 8266468
Hi
If Form4 is a pointer of TForm4, and I think it is since you're using "new" to create it, you can verify that the form exist by checking if our pointer is Null:
if (Form4 != NULL)
{
//displaying variables on Form4
}
If you are doing this test outside of the fonction in witch the Form4 was created, Form4 must be a global variable. So it a to be declare in your .h file with #include <the unit containing TForm4>
It work fine for me on C++ Builder 6 so it will probably work on C++ Builder 5.
Hope this is what you were looking for.
Dédé