Hi
My application is creating Tree of thousand or lack of folder ad files..
I m using setText,setFont,setIcon for QTreeWidget for every folder..
But in the mid of application it crashes while creating tree...

I m using code like this:

Qt Code: 
  1. void* StellarPhoenixMAC::InsertFoldersInTree(void* myEntry,QString bFileName)
  2. {
  3.       MyEntry	=	(DOSDIR*)myEntry;
  4.  
  5.  
  6.       QIcon Folder(":/images/img_Folder.png");
  7.       QSize size(18,18);//Set the size of the Item in treeWidget
  8.       QSize folderSize(16,16); 	
  9.       QFont lucidaFont("Lucida Grande", 12);
  10.  
  11. 	  unsigned int nListCnt = 0;		
  12. 	  QTreeWidgetItem *treeViewItem = NULL;
  13.  
  14.       iProgressCounter++;
  15.  
  16.  
  17.       //Check if root already there or not
  18.       //if(!bDriveTree && bProcessStarted)
  19.  
  20. 	   if(!m_dwDirLength)
  21. 	   {
  22. 				m_dwDirLength++;
  23. 			    DOSDIR	*firstDirLink=NULL;		
  24. 				firstDirLink = (DOSDIR*)calloc(1,sizeof(DOSDIR));            //For CreateDirTreeRootItem  added here
  25.  
  26. 				if(firstDirLink)
  27. 				{
  28. 					 firstDirLink->dwFileId = ROOTREFRENCE;
  29. 					 firstDirLink->bAttribute=0x10;
  30. 					 firstDirLink->bCheckStatus=UNCHECK;
  31. 					 //Root's ParentID is set to -1 so as to keep it unique
  32. 					 firstDirLink->dwParentId=0;
  33. 				}
  34.  
  35. 				   list.append(new TREEITEM((void*)firstDirLink,QString::fromAscii((const char *)m_pDriveForSavingFiles->VolumeLable,-1)));
  36. 				   emit MacFileSysRootTree(QString::fromAscii((const char *)m_pDriveForSavingFiles->VolumeLable,-1),qFileId.setNum(ROOTREFRENCE),QString::number(0));
  37.  
  38. 				m_MacFileSys->MacFileSysThreadSleep();
  39.  
  40. 				if(list.count() > 0)
  41. 				{
  42. 				   treeitem=list.first();
  43. 				   treeitem->ListViewItem=MacFileSysRootItem;
  44. 				}
  45.  
  46. 				free(firstDirLink);
  47. 	    }///end of if(!m_dwDirLength)
  48. 		m_dwDirLength++;
  49. 		m_dwTotalDirs++;
  50.  
  51. 		if(!bFileName.isEmpty())
  52. 		   list.append(new TREEITEM((void*)MyEntry,bFileName));    	//Item added to list
  53. 		else
  54. 		   list.append(new TREEITEM((void*)MyEntry,QString::number(MyEntry->dwFileId)));    	//Item added to list 		
  55.  
  56. 		nListCnt = list.count();
  57. 		 //if(list.count() > 0)
  58. 		     // treeitem=list.last(); 
  59. 		if(nListCnt)		 
  60. 		    treeitem = list.at(nListCnt-1);
  61.  
  62. 		treeViewItem = new QTreeWidgetItem;
  63.  
  64. 		//if(!TotalFilesAndFoldersInList.isEmpty())
  65.         //     m_pTotalSizeReadLabel->setText(TotalFilesAndFoldersInList);
  66.  
  67. 		QString ID = QString::number(MyEntry->dwFileId);
  68. 		QString parentId = QString::number(MyEntry->dwParentId);
  69.  
  70. 		if(!bFileName.isEmpty())	
  71. 				treeViewItem->setText(0,bFileName);
  72. 		else
  73. 		{
  74. 				if(!ID.isEmpty())
  75. 					 treeViewItem->setText(0,ID);
  76. 			else
  77. 				 treeViewItem->setText(0,"NONAME");
  78. 		}
  79.  
  80. 		if(!ID.isEmpty())				
  81. 				treeViewItem->setText(1,ID);
  82.  
  83. 		if(!parentId.isEmpty())		
  84. 				treeViewItem->setText(2,parentId);
  85. 		//emit SetFolderTree((void*)treeViewItem,bFileName,QString::number(MyEntry->dwFileId),QString::number(MyEntry->dwParentId));
  86.  
  87. 		if(MacFileSysRootItem !=NULL && treeViewItem != NULL)
  88. 		     MacFileSysRootItem->insertChild(0,treeViewItem);
  89.  
  90. 		treeViewItem->setCheckState (0, Qt::Unchecked );
  91. 		treeViewItem->setIcon (0, Folder );		 
  92.  
  93.  
  94. 		if(treeitem != NULL && treeViewItem != NULL)				
  95. 		    treeitem->ListViewItem= treeViewItem;
  96.  
  97. 	 return( (void*)treeViewItem);	  
  98. }
  99.  
  100. void StellarPhoenixMAC::SetFolderTree (void* treeViewItem,QString bFileName, QString ID,QString parentId)
  101. {
  102.     QIcon Folder(":/images/img_Folder.png");
  103. 	QSize size(18,18);//Set the size of the Item in treeWidget
  104. 	QSize folderSize(16,16); 
  105. 	QFont lucidaFont("Lucida Grande", 12);
  106.  
  107.     if(!TotalFilesAndFoldersInList.isEmpty())
  108.         m_pTotalSizeReadLabel->setText(TotalFilesAndFoldersInList);
  109.  
  110.     if(!bFileName.isEmpty())	
  111. 	    ((QTreeWidgetItem*)treeViewItem)->setData(0,Qt::DisplayRole,bFileName);
  112. 	else
  113. 	{
  114. 	    if(!ID.isEmpty())
  115. 	   	   ((QTreeWidgetItem*)treeViewItem)->setData(0,Qt::DisplayRole,ID);
  116. 		else
  117. 		   ((QTreeWidgetItem*)treeViewItem)->setData(0,Qt::DisplayRole,"NONAME");
  118. 	}
  119.  
  120. 	if(!ID.isEmpty())				
  121. 	    ((QTreeWidgetItem*)treeViewItem)->setData(1,Qt::DisplayRole,ID);
  122.  
  123. 	if(!parentId.isEmpty())		
  124. 	    ((QTreeWidgetItem*)treeViewItem)->setData(2,Qt::DisplayRole,parentId);
  125.  
  126. 	//((QTreeWidgetItem*)treeViewItem)->setFont(0,lucidaFont);
  127.  
  128. 	//((QTreeWidgetItem*)treeViewItem)->setCheckState (0, Qt::Unchecked );
  129. 	//((QTreeWidgetItem*)treeViewItem)->setIcon (0, Folder );
  130. 	//((QTreeWidgetItem*)treeViewItem)->setSizeHint (0,size );
  131.  
  132.  
  133. 	((QTreeWidgetItem*)treeViewItem)->setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsUserCheckable );	
  134. }
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if anybody know why it is crashing plz help me...