Traverse folder and build directory tree

Some days ago, I am in the process of doing a program encountered such a problem, to use the tree-type control to quickly browse the files in the specified folder, after some trouble, finally made out, think some of my fellow may encounter and I the same difficulties, so I write the practice, I hope that some help!

(This program runs the effect chart)

The basic principle is to use the recursive call of the function, and then add the parameter tracking. While I was debugging the program, I tracked the discovery that the program returned a directory of the same sibling only after traversing all subdirectories in a directory. This allows you to use the value of the parameter to determine the level of the directory.

(1) Add a tree control to the dialog box and select has Buttons, has Lines, Lines at Root in the style.

(2) Defining variables:

HTREEITEM strRoot;　//根目录
HTREEITEM strHTFir;　//第一层
HTREEITEM strHTSec;　//第二层
HTREEITEM strHtThi;　//第三层
HTREEITEM strHtFor;　//第四层
HTREEITEM strHtFif;　//第五层
// 没有找到更好的方法，所以只能这样来显示，估计一下大约能用到几层，如 果找到好方法，请告诉我，非常感谢！
HTREEITEM strHtEnd;　//文件目录(3) Adding a function to traverse a folder browsefile (int callnum, CString strfile)

Calnum-is used to record the first layers of directories, strfile-paths

and add the following:

void Cfiletreedlg::browsefile (int callnum, CString strfile)
{
callnum++;
CFileFind FF;
CString szdir = strfile;
　　
if (Szdir.right (1)!= "\")
Szdir + = "\";
　　
Szdir + = "*.*";
　　
BOOL res = ff. FindFile (Szdir);
while (RES)
{
res = ff. FindNextFile ();
if (ff. Isdirectory () &&!ff. Isdots ())//directory is a folder
{
If it's a subdirectory, continue to look deeper with recursion.
CString strpath = ff.　GetFilePath (); Get the path as the beginning of the recursive call
CString strtitle = ff.　GetFileTitle (); Get the directory name as a tree-controlled node.
int i = 0;
Switch (callnum)
{
Case 1:
Strhtfir = M_filetree.insertitem (strtitle,0,0,null);
Break
Case 2:
Strhtsec = M_filetree.insertitem (Strtitle,0,0,strhtfir);
Break
Case 3:
Strhtthi = M_filetree.insertitem (strtitle,0,0,strhtsec);
Break
Case 4:
Strhtfor = M_filetree.insertitem (Strtitle,0,0,strhtthi);
Break
Default
Strhtfif = M_filetree.insertitem (strtitle,0,0,strhtfor);
Break
}
Browsefile (Callnum,strpath); Recursive call
}
else if (!ff. Isdirectory () &&!ff. Isdots ())//reach the lowest level of the file
{
Displays the files currently accessed
CString strpath;
CString strtitle;
strpath = ff. GetFilePath ();
strtitle = ff. GetFileTitle ();
Switch (callnum)
{
Case 1:
Strroot = M_filetree.insertitem (strtitle,0,0,null);
Break
Case 2:
Strhtend = M_filetree.insertitem (Strtitle,0,0,strhtfir);
Break
Case 3:
Strhtend = M_filetree.insertitem (strtitle,0,0,strhtsec);
Break
Case 4:
Strhtend = M_filetree.insertitem (Strtitle,0,0,strhtthi);
Break
Case 5:
Strhtend = M_filetree.insertitem (strtitle,0,0,strhtfor);
Break
Default
Strhtend = M_filetree.insertitem (STRTITLE,0,0,STRHTFIF);
Break
}
}
}
Ff.　Close (); Shut down
}(4) Set the tree control's icon in the OnInitDialog () function and invoke the Custom function Browsefile ()BOOL CFileTreeDlg::OnInitDialog()
{
　　m_iImageList.Create(24, 24, TRUE,1, 0);　//创建图标链
　　HICON hIcon = NULL;
　　hIcon = (HICON)::LoadImage(::AfxGetInstanceHandle(),
　　　　MAKEINTRESOURCE(IDI_KEBIAO), IMAGE_ICON, 24, 24, 0);
　　m_iImageList.Add(hIcon);
　　m_FileTree.SetImageList ( &m_iImageList,TVSIL_NORMAL );
　　BrowseFile(0,"课程表");　//遍历"课程表"文件夹 内的所有目录
}

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