Advanced MFC Programming

Chapter 14. Views
}
ff.Close();
Destroying the Old List
Whenever the current working directory is changed, we need to call function CExplorerView::
ChangeDir() to create new file list. Before building a new one, we need to delete the old list. In the sample,
this is implemented by function CExplorerView::DestroyList(). Within this function, both list items and
image lists are deleted:
void CExplorerView::DestroyList()
{
CImageList *pilCtrl;
}
GetListCtrl().DeleteAllItems();
pilCtrl=GetListCtrl().GetImageList(LVSIL_NORMAL);
if(pilCtrl != NULL)
{
pilCtrl->DeleteImageList();
delete pilCtrl;
}
pilCtrl=GetListCtrl().GetImageList(LVSIL_SMALL);
if(pilCtrl != NULL)
{
pilCtrl->DeleteImageList();
delete pilCtrl;
}
Since we can retrieve the pointers of image list from the list control, there is no need for us to store
them as variables. This function is called in function CExplorerView::ChangeDir() and WM_DESTROY
message handler.
Using Function CExplorerView::ChangeDir()
At this point, we still do not allow the user to select a directory by clicking on a directory node in the
tree view window. So we can only display the files and directories contained in the root directory when the
application is first invoked. This is implemented in function CExplorerView::OnInitialUpdate(), where
we find the first available drive, and call function CExplorerView::ChangeDir() to create the list view:
void CExplorerView::OnInitialUpdate()
{
int drive;
CListView::OnInitialUpdate();
for(drive=1; drive