C++ – How to disable closure of the main form in Borland C++

c++buildervcl

When closing an application on close button (FormClose handler is called), 
there is a dialog if user is sure that he wants to close the application. 
If the result of the dialog is mrCancel, then I try to set the ModalResult
of a main form to mrNone like I do with other forms, but even though, the 
application still closes.

What is the solution?

Cheers.

Best Answer

In the form's FormCloseQuery, set CanClose to false.

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After upgrading my Delphi installation from version 12.0.3170.16989 (no updates) to version 12.0.3420.21218 (update 3 & 4) I could not reproduce the problem anymore.

Seems like it was a bug that was fixed in the update.

How to set the MainForm to be hidden when the program starts

Have a look at the TApplication ShowMainForm property.

Here is an example based on the instructions in online help.

Set the main form Visible property to false.
On the menu select Project -> View Source to display the main project file.
Add the following code after the call to Application->CreateForm and before the call to Application->Run.

Application->ShowMainForm = false;

You should end up with something like this.

try
{
  Application->Initialize();
  Application->MainFormOnTaskBar = true;
  Application->CreateForm(__classid(TMainForm), &MainForm);
  // extra code to hide main form
  Application->ShowMainForm = false;
  Application->Run();
}

Best Answer

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