Solved

MainForm.FormShow being called before Application.Run

Posted on 2011-03-07
3
670 Views
Last Modified: 2012-05-11
I have a Delphi project comprising several forms
The forms are created automatically at start up

My main form has a FormCreate and FormShow routine

For the past 6 weeks of development the Mainform.FormShow routine has not been triggered until all the other forms have been successfully created.

Something has changed (I am not sure what) in the last 2 hours, and now the MainForm.FormShow routine is being called immediately after the MainForm.FormCreate.

This causes me problems as the FormShow routine makes use of the other auto created forms.

The MainForm.FormShow call is being triggered by the TCustomForm.CMShowingChanged method (defined in unit Forms) which is triggered by message CM_SHOWINGCHANGED

What could be causing this to be triggered?  

This is really causing me to pull my hair out - any thoughts appreciated.

Jon
0
Comment
Question by:jon_rs
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 32

Accepted Solution

by:
Ephraim Wangoya earned 500 total points
ID: 35058790

Open your project file (.dpr) file
Move the MainForm down the list

However you should not AutoCreate forms unless its a global DataModule, its not good practice.

Forms should be cerated when needed, in this case they should be created in your mainform.formcreate, used and then freed as needed
0
 
LVL 19

Expert Comment

by:Thommy
ID: 35059223
ewangoya is right, DO NOT auto-create forms other than your main form!!!

If you create your forms in mainform.formcreate, you can be sure, that mainform.Formshow triggers after the creation of your forms...
0
 

Author Comment

by:jon_rs
ID: 35059329
Thanks ewangoya

Have moved my form creation to MainForm.FormCreate and everything works again.

Slight frustration that Delphi creates this problem in the first place by defaulting to auto creation of forms ... but problem solved

Jon
0

Featured Post

Simplifying Server Workload Migrations

This use case outlines the migration challenges that organizations face and how the Acronis AnyData Engine supports physical-to-physical (P2P), physical-to-virtual (P2V), virtual to physical (V2P), and cross-virtual (V2V) migration scenarios to address these challenges.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
Internet Explorer 11.0 fails to open 34 86
Network adapter for Windows 7 9 55
BgInfo help 5 64
Executing a script at Windows shutdown 7 27
Introduction Raise your hands if you were as upset with FireMonkey as I was when I discovered that there was no TListview.  I use TListView in almost all of my applications I've written, and I was not going to compromise by resorting to TStringGrid…
OfficeMate Freezes on login or does not load after login credentials are input.
Windows 8 comes with a dramatically different user interface known as Metro. Notably missing from the new interface is a Start button and Start Menu. Many users do not like it, much preferring the interface of earlier versions — Windows 7, Windows X…
This Micro Tutorial will go in depth within Systems and Security in Windows 7 and will go into detail regarding Action Center, Windows Firewall, System, etc. This will be demonstrated using Windows 7 operating system.

749 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question