Categories: Known Issue | Symbian C++ | S60 3rd Edition | Location Based Services

This page was last modified 08:07, 16 November 2007.

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This known issue was originally created by Santeriv and has been verified by Forum Nokia.

Description

Landmarks category selector dialog (CLmkCategorySelectorDlg) seems to leak memory whenever a category or categories are selected.

How to reproduce

 #include <clmkcategoryselectordlg.h>  // link against lmkcommonui.lib
 #include <tlmkitemiddbcombiinfo.h>
 
 CLmkCategorySelectorDlg* dlg = CLmkCategorySelectorDlg::NewL(EFalse);
 
 TLmkItemIdDbCombiInfo selectedItem;
 
 TInt ret = dlg->ExecuteLD(selectedItem); // dlg is deleted automatically
 
 if( ret != 0 )
  {
  // 'Select' or OK was pressed
  }  

The above code results in a memory leak. This is easiest to observe when running the code in the emulator because the ALLOC: <address> error is displayed when exiting the application.

Solution

After selecting a category, the TLmkItemIdDbCombiInfo object contains a pointer to the landmarks database. The client is responsible for deleting this pointer once it is no longer needed.

 ...
 TInt ret = dlg->ExecuteLD(selectedItem);
 
 if( ret != 0 )
  {
  ...       
  // store the pointer to CPosLandmarkDatabase and
  // remember to delete it in the destructor
  ilDb = selectedItem.GetLmDb();
  }  

See the LocationLandmarksUIRefApp SDK example application for a demonstration on using CLmkCategorySelectorDlg.