How to delete a QObject derived class from within one of its own methods - Revision history

Hamishwillee: Text replace - "`" to ""`


2012-10-11T01:17:06Z
Text replace - "<code cpp>" to "<code cpp-qt>"

			
			
			
			
		
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		Revision as of 01:17, 11 October 2012
		
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  In order to delete a QObject-derived class from one of its own methods, developers have to use     In order to delete a QObject-derived class from one of its own methods, developers have to use  
− <code cpp> + <code cpp-qt>
  deleteLater();   deleteLater();
  </code>   </code>
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  Beginner developers sometimes use     Beginner developers sometimes use  
− <code cpp> + <code cpp-qt>
  delete this;   delete this;
  </code>   </code>



Hamishwillee: Hamishwillee - Bot update - Add ArticleMetaData
2012-07-23T12:36:05Z
Hamishwillee - Bot update - Add ArticleMetaData

			
			
			
			
		
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		Revision as of 12:36, 23 July 2012
		
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− [[Category:Qt]][[Category:How To]][[Category:Code Examples]] + [[Category:Qt]][[Category:How To]][[Category:Code Snippet]]
− {{ArticleMetaData + {{ArticleMetaData <!-- v1.2 -->
− |id= + |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
  + |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
  + |devices= <!-- Devices tested against - e.g. ''devices=Nokia 6131 NFC, Nokia C7-00'') -->
  + |sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
  |platform= All   |platform= All
− |devices= + |devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
− |category= Qt + |dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
  + |signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
  + |capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
  + |keywords= Qt, deleteLater
  + |language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
  + |translated-by= <!-- [[User:XXXX]] -->
  + |translated-from-title= <!-- Title only -->
  + |translated-from-id= <!-- Id of translated revision -->
  + |review-by= <!-- After re-review: [[User:username]] -->
  + |review-timestamp= <!-- After re-review: YYYYMMDD -->
  + |update-by= <!-- After significant update: [[User:username]]-->
  + |update-timestamp= <!-- After significant update: YYYYMMDD -->
  + |creationdate= 20-Jun-2010
  + |author= [[User:Gnuton]]
  + <!-- The following are not in current metadata -->
  |subcategory=     |subcategory=  
− |creationdate=20-Jun-2010  
− |keywords= Qt, deleteLater  
−  
− |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->  
− |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->  
− |sdk=<!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->  
− |devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) -->  
− |signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer -->  
− |capabilities=<!-- Capabilities required (e.g. Location, NetworkServices.) -->  
− |author=[[User:Gnuton]]  
  }}   }}
    
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  Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class.   Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class.
    
− There are no problem if a signal or a method calls more than one time [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater  QObject::deleteLater()] + There are no problem if a signal or a method calls more than one time [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater QObject::deleteLater()]
    
− Beginner developers sometimes  use   + Beginner developers sometimes use  
  <code cpp>   <code cpp>
  delete this;   delete this;
  </code>   </code>
− and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library  will crash. + and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library will crash.
  * Related Qt Documentation link   * Related Qt Documentation link
    
  Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]   Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
  [[Category:Qt]][[Category:MeeGo Harmattan]] [[Category:Symbian]]   [[Category:Qt]][[Category:MeeGo Harmattan]] [[Category:Symbian]]



Hamishwillee: Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan"
2012-06-13T10:53:45Z
Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan"

			
			
			
			
		
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		Revision as of 10:53, 13 June 2012
		
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  Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]   Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
− [[Category:Qt]][[Category:MeeGo]] [[Category:Symbian]] + [[Category:Qt]][[Category:MeeGo Harmattan]] [[Category:Symbian]]



Hamishwillee: Hamishwillee - Addition to article of: Category:MeeGo Category:Symbian. (Add platform categories)
2012-02-15T05:42:45Z
Hamishwillee - Addition to article of: Category:MeeGo Category:Symbian. (Add platform categories)

			
			
			
			
		
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		Revision as of 05:42, 15 February 2012
		
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  Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]   Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
− [[Category:Qt]] + [[Category:Qt]][[Category:MeeGo]] [[Category:Symbian]]



Hamishwillee: Hamishwillee - Bot change of template (Template:CodeSnippet) - now using Template:ArticleMetaData
2011-06-24T09:22:52Z
Hamishwillee - Bot change of template (Template:CodeSnippet) - now using Template:ArticleMetaData

			
			
			
			
		
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		Revision as of 09:22, 24 June 2011
		
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  [[Category:Qt]][[Category:How To]][[Category:Code Examples]]   [[Category:Qt]][[Category:How To]][[Category:Code Examples]]
− {{CodeSnippet + {{ArticleMetaData
  |id=   |id=
  |platform= All   |platform= All
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  |creationdate=20-Jun-2010   |creationdate=20-Jun-2010
  |keywords= Qt, deleteLater   |keywords= Qt, deleteLater
  + 
  + |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
  + |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
  + |sdk=<!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
  + |devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) -->
  + |signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
  + |capabilities=<!-- Capabilities required (e.g. Location, NetworkServices.) -->
  + |author=[[User:Gnuton]]
  }}   }}
    



Jimgilmour1: add code example category
2010-06-21T07:40:23Z
add code example category

			
			
			
			
		
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		Revision as of 07:40, 21 June 2010
		
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  + [[Category:Qt]][[Category:How To]][[Category:Code Examples]]
  {{CodeSnippet   {{CodeSnippet
  |id=   |id=
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  |category= Qt   |category= Qt
  |subcategory=     |subcategory=  
− |creationdate= + |creationdate=20-Jun-2010
  |keywords= Qt, deleteLater   |keywords= Qt, deleteLater
  }}   }}



Jimgilmour1: minor format
2010-06-20T16:02:01Z
minor format

			
			
			
			
		
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		Revision as of 16:02, 20 June 2010
		
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  </code>   </code>
  and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library  will crash.   and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library  will crash.
− =Related Qt Documentation link = + * Related Qt Documentation link
  +  
  Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]   Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
  [[Category:Qt]]   [[Category:Qt]]



Jimgilmour1: add documentation link
2010-06-20T16:00:54Z
add documentation link

			
			
			
			
		
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		Revision as of 16:00, 20 June 2010
		
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  Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class.   Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class.
    
− There are no problems if a signal or a method call more than one time [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater  QObject::deleteLater()] + There are no problem if a signal or a method calls more than one time [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater  QObject::deleteLater()]
    
− Beginner developers sometime use   + Beginner developers sometimes  use  
  <code cpp>   <code cpp>
  delete this;   delete this;
  </code>   </code>
  and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library  will crash.   and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library  will crash.
  + =Related Qt Documentation link =
  + Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
  [[Category:Qt]]   [[Category:Qt]]




Gnuton at 11:26, 20 June 2010
2010-06-20T11:26:04Z


			
			
			
			
		
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		Revision as of 11:26, 20 June 2010
		
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  |subcategory=     |subcategory=  
  |creationdate=   |creationdate=
− |keywords= Qt + |keywords= Qt, deleteLater
  }}   }}
    



Gnuton: Created page with '{{CodeSnippet |id= |platform= All |devices= |category= Qt |subcategory=  |creationdate= |keywords= Qt }}  In order to delete a QObject-derived class from one of its own methods, …'
2010-06-20T11:25:32Z
Created page with '{{CodeSnippet |id= |platform= All |devices= |category= Qt |subcategory=  |creationdate= |keywords= Qt }}  In order to delete a QObject-derived class from one of its own methods, …'
New page
{{CodeSnippet

|id=

|platform= All

|devices=

|category= Qt

|subcategory= 

|creationdate=

|keywords= Qt

}}



In order to delete a QObject-derived class from one of its own methods, developers have to use 

<code cpp>

deleteLater();

</code>

Since this is a public slot, it can be connected to a signal or it can be just called in any method of the class.



There are no problems if a signal or a method call more than one time [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater  QObject::deleteLater()]



Beginner developers sometime use 

<code cpp>

delete this;

</code>

and this is dangerous since the Qt event loop could invoke a method of the deleted class. Hence, the application or library  will crash.

[[Category:Qt]]

← Older revision		Revision as of 10:53, 13 June 2012
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	Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]		Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
−	[[Category:Qt]][[Category:MeeGo]] [[Category:Symbian]]	+	[[Category:Qt]][[Category:MeeGo Harmattan]] [[Category:Symbian]]

← Older revision		Revision as of 05:42, 15 February 2012
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	Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]		Qt 4.6 [http://doc.qt.nokia.com/4.6/qobject.html#deleteLater deleteLater()]
−	[[Category:Qt]]	+	[[Category:Qt]][[Category:MeeGo]] [[Category:Symbian]]

How to delete a QObject derived class from within one of its own methods - Revision history

Hamishwillee: Text replace - "" to ""

Hamishwillee: Hamishwillee - Bot update - Add ArticleMetaData

Hamishwillee: Text replace - "Category:MeeGo" to "Category:MeeGo Harmattan"

Hamishwillee: Hamishwillee - Addition to article of: Category:MeeGo Category:Symbian. (Add platform categories)

Hamishwillee: Hamishwillee - Bot change of template (Template:CodeSnippet) - now using Template:ArticleMetaData

Jimgilmour1: add code example category

Jimgilmour1: minor format

Jimgilmour1: add documentation link

Gnuton at 11:26, 20 June 2010

Gnuton: Created page with '{{CodeSnippet |id= |platform= All |devices= |category= Qt |subcategory= |creationdate= |keywords= Qt }} In order to delete a QObject-derived class from one of its own methods, …'

Hamishwillee: Text replace - "`" to ""`