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Thread: QTreeWidget Crashing while setText,setFont,setIcon

  1. 19th February 2008, 08:45 #1
    santosh.kumar
    santosh.kumar is offline Intermediate user
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    Default QTreeWidget Crashing while setText,setFont,setIcon

    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...
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  2. 19th February 2008, 11:11 #2
    jpn
    jpn is offline Guru
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    Default Re: QTreeWidget Crashing while setText,setFont,setIcon

    Start with removing void pointers and C-style casts. This will let compiler do sanity checks.
    J-P Nurmi
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  3. 19th February 2008, 11:34 #3
    santosh.kumar
    santosh.kumar is offline Intermediate user
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    Default Re: QTreeWidget Crashing while setText,setFont,setIcon

    But without (void*)treeItem which typecasting i will use....Is there any other alternative..

    According to my application requirment function return QtreeWidgetItem to other class...
    How i will use qt casting here...kindly tell me
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  4. 19th February 2008, 11:36 #4
    jpn
    jpn is offline Guru
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    Default Re: QTreeWidget Crashing while setText,setFont,setIcon

    This forum is not about C++ programming basics. Please refer your favourite C++ book about type casting.
    J-P Nurmi
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