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Cactus
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 Posted: Wed Dec 17, 2003 8:52 am Post subject: TApplication::Handle mistake. |
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Hi
I'm mixed TApplication::Handle with Application variable.
Which is the ID of the running process?
When I making a Form use
new Form(AOwner);
the AOwner is "Application" variable or TApplication::Handle ?
Thanks.
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Remy Lebeau (TeamB)
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| Posted: Wed Dec 17, 2003 6:03 pm Post subject: Re: TApplication::Handle mistake. |
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"Cactus" <a@b.com> wrote
| Quote: | Which is the ID of the running process?
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Neither. The Application variable itself is just a pointer to a global
instance of the TApplication class. Its Handle property is just an HWND
handle to a hidden window used as the parent window for all of the TForm
instances in the app and such.
| Quote: | When I making a Form use
new Form(AOwner);
the AOwner is "Application" variable or TApplication::Handle ?
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Just "Application", ie:
new TMyForm(Application);
Gambit
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René Wilhelmy
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| Posted: Wed Dec 17, 2003 6:13 pm Post subject: Re: TApplication::Handle mistake. |
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Hi,
First, it's pretty more usual to instantiate a descendant of TForm that
is defined in the forms designer. Inside CBuilder is more the AOwner as
a TComponent value which "Application" or any Form is derived who is
used. The Application (or parent form)will be responsible for freeing it.
To instantiate a secondary form within your main form you can do:
//--using the hidden «this» pointer who point to your main form instance
TMyCoolForm *MyCForm = new TMyCoolForm(this);
MyCForm->Show();
Passing a window handle (HWND) will be (here I paste from the Help File):
«Pass a window handle as a parameter to embed the form in a non-VCL
window. This syntax is used when the form is implemented as an ActiveX
control that is embedded in a non-VCL window»
Rene Wilhelmy
Cactus a écrit:
| Quote: | Hi
I'm mixed TApplication::Handle with Application variable.
Which is the ID of the running process?
When I making a Form use
new Form(AOwner);
the AOwner is "Application" variable or TApplication::Handle ?
Thanks.
|
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Cactus
Guest
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| Posted: Thu Dec 18, 2003 12:54 pm Post subject: Re: TApplication::Handle mistake. |
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| Quote: | When I making a Form use
new Form(AOwner);
the AOwner is "Application" variable or TApplication::Handle ?
Just "Application", ie:
new TMyForm(Application);
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if the Form inside a DLL, it need host EXE send the Application to DLL? or
use
new TMyForm(NULL);
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Remy Lebeau (TeamB)
Guest
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| Posted: Thu Dec 18, 2003 7:04 pm Post subject: Re: TApplication::Handle mistake. |
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"Cactus" <a@b.com> wrote
| Quote: | if the Form inside a DLL, it need host EXE send the Application
to DLL? or use
new TMyForm(NULL);
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I would suggest NULL. Just make sure that you actually free the form when
you are done with it, since it won't have an Owner to do it for you.
Gambit
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