Advanced MFC Programming

Chapter 14. Views
CFileFind ff;
BOOL bWorking;
bWorking=ff.FindFile();
while(bWorking)
{
bWorking=ff.FindNextFile();
AfxMessageBox(ff.GetFileName());
}
Note we can also use wildcard characters when calling function CFileFind::FindFile(…) to match
file name with specific patterns. If we do not pass any parameter to it, it will be equal to passing “*.*” to
the function. In this case all the files and directories will be enumerated. If function CFileFind::
FindNextFile() returns a non-zero value, we can call several other member functions of class CFileFind
to obtain the properties of the enumerated file such as file name, file path, file attributes, created time and
updated time.
Adding Directory Nodes
In order to add directory node to the tree view window, we need to implement a loop and enumerate
directories for each available drive, then add the enumerated directories to the tree.
Besides directories, we also need to enumerate sub-directories for the expanded nodes. This is because
our tree control supports buttons (we have set TVS_HASBUTTONS style), which indicates whether an item has
child items or not. For a node that contains child items, its button will contain a “+” sign when the node is
in collapsed state, indicating that the node is expandable. For a node that does not contain child items, there
will be no such type of buttons.
So the directory enumeration can be added to the loop of enumerating all drives: after an existing drive
is found, we can change the current working directory to the root directory of this drive, then enumerate all
the first-level directories and all the sub-directories of each first-level directory.
Function CDirView::AddDirs(…) is implemented in the sample, it will be used to add directory items
to a specified node. It has two parameters, the first is the handle of the target tree item, and the second is a
Boolean type variable indicating if we should further add sub-directories for each added directory node.
The following is the format of this function:
void CDirView::AddDirs(HTREEITEM hTreeItem, BOOL bFindChild);
Before calling this function, we need to change the current working directory to the directory we want
to examine. So in function CDirView::OnInitialUpdate(…), after one drive node is added to the tree view
window, we change the current working directory to root directory of that drive, and call function
CDirView::AddDirs(…) to add nodes for the directories. The following is the modified portion of function
CDirView::OnInitialUpdate(…):
……
……
for(drive=1; drive