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MainForm.FormShow being called before Application.Run

Posted on 2011-03-07
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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
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Question by:jon_rs
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3 Comments
 
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Accepted Solution

by:
Ephraim Wangoya earned 2000 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
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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...
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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
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