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How to check if another form is open
Message
From
11/01/2006 09:56:59
Peter De Valença
Haarlem, Netherlands
 
General information
Forum:
Visual FoxPro
Category:
Forms & Form designer
Title:
Re: How to check if another form is open
Miscellaneous
Thread ID:
01085589
Message ID:
01085616
Views:
18
>I want to be able to ascertain if another form is open, then transfer control to that form. It sounds easy but can't find the syntax for this.

Here is ONE solution.

Create a private, nevertheless global, variable for each form in your main prg:
* Notice that I use the g here for private variables. The g indicates that 
* these variables are visible/global to the entire application.
* The only place where private variables are allowed to start with a g is the 
* main program. This usage of g is different from what's proposed in the 
* vfp-documentation (where it's advised for public variables.)
private goMainWindow
goMainWindow = NULL
Whenever you create the form, use the NAME keyword.
do form MainWindow name goMainWindow
In the rest of your application, so also in the SKIPs of your menus, you can test for the datatype of the variable.
if vartype( m.goMainWindow, .f. ) = 'O'
   * form still exists
   m.goMainWindow.show()
else
   * form does not (or no longer) exist
endif
Groet,
Peter de Valença

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