topic-25762

Posts: 166

Joined: Wed Aug 29, 2012 08:25 AM

WndMain() unexpected nil
Posted: Sat Mar 02, 2013 08:06 AM

Hello,

This week i had two errors (code runs mostly without problems) :

Error description: Error BASE/1004 Class: 'NIL' has no exported method: HWND
Called from: => HWND( 0 )
Called from: .\source\classes\RPREVIEW.PRG => (b)TPREVIEW:ACTIVATE( 169 )

Code (fw): Select all Collapse

if ::oWndMain == nil
    StopUntil( { || ::lExit } )
else
    StopUntil( { || ::lExit .or. !IsWindow( WndMain():hWnd ) } )  <== 169 !!!!
endif

WndMain() seems to return nil. The stacklist shows as last line the line where the main window is activated. There is a main window !!
Also is it clear that ::oWndMain <> nil.

FRank

test

Antonio Linares

Posts: 44162

Joined: Thu Oct 06, 2005 05:47 PM

Re: WndMain() unexpected nil
Posted: Sat Mar 02, 2013 09:42 AM

Frank,

We recently commented about it here. It happens because the main window is closed meanwhile the print preview is shown.

Use the VALID of the main window to control is the preview is opened or not, so the user can't leave, or at least, ask the user to close it

regards, saludos

Antonio Linares
www.fivetechsoft.com

Franklin Demont

Posts: 166

Joined: Wed Aug 29, 2012 08:25 AM

Re: WndMain() unexpected nil
Posted: Sat Mar 02, 2013 12:25 PM

Antonio Linares wrote:Frank,

We recently commented about it here. It happens because the main window is closed meanwhile the print preview is shown.

Use the VALID of the main window to control is the preview is opened or not, so the user can't leave, or at least, ask the user to close it

How can i know in the mainwindow that a preview is opened ?

Is it possible to change the code in rpreview.prg , avoiding the error ?

Frank

test

nageswaragunupudi

Posts: 10733

Joined: Sun Nov 19, 2006 05:22 AM

Re: WndMain() unexpected nil
Posted: Sat Mar 02, 2013 03:30 PM

Suggestion

Code (fw): Select all Collapse

StopUntil( { || ::lExit .or. WndMain() == nil .or. !IsWindow( WndMain():hWnd ) } )

Does this help?

Regards

G. N. Rao.

Hyderabad, India

FiveTech Support Forums

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