求助！遍历一个文件夹下的txt文件，并可以随机的读取一篇txt的内容出来。赋值给一个字符串保存，

[weixin_42976685]

BOOL CWebDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// Add "About..." menu item to system menu.

// IDM_ABOUTBOX must be in the system command range.
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
ASSERT(IDM_ABOUTBOX < 0xF000);

CMenu* pSysMenu = GetSystemMenu(FALSE);
if (pSysMenu != NULL)
{
CString strAboutMenu;
strAboutMenu.LoadString(IDS_ABOUTBOX);
if (!strAboutMenu.IsEmpty())
{
pSysMenu->AppendMenu(MF_SEPARATOR);
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
}
}

// Set the icon for this dialog. The framework does this automatically
// when the application's main window is not a dialog
SetIcon(m_hIcon, TRUE); // Set big icon
SetIcon(m_hIcon, FALSE); // Set small icon

// TODO: Add extra initialization here
ffFile("","txt")

return TRUE; // return TRUE unless you set the focus to a control
}


这是系统自动的代码，加了一句ffFile("","txt")，因为添加这个按F9,和F5之后才能进行调试，才能抓起值，我下面的程序只能读出文件夹，第一个冒号填的文件夹，第二个该填什么呢？





本人刚接触VC++，请各位能指点一二吗
在前面的
void CWebDlg::ff(CString strDir,CString strExt)
{
static int i=0,j=0;
CFileFind fileFinder ;
CString strWildcard = strDir;

if(strWildcard.Right(1) != "\\")
strWildcard += "\\";
strWildcard += "*.*";


BOOL fSuccess = fileFinder.FindFile(strWildcard) ;

while (fSuccess)
{
fSuccess = fileFinder.FindNextFile() ;

if (fileFinder.IsDots()) {
continue ;
}

if (fileFinder.IsDirectory())
{

ff(fileFinder.GetFilePath(), strExt) ; //递归调用
}
else
{

CString fpath[1024];
CString fname[1024];
int artnum;
CString strFilePath = fileFinder.GetFileName();
if (0 == strExt.CompareNoCase(PathFindExtension(strFilePath)))
{
fpath[i++]=strFilePath;
fname[j++]=fileFinder.GetFileName();
artnum++;
}
}
}

fileFinder.Close() ;

[schlafenhamster]

例子

typedef struct FileInfo
{
    string szFileName;
    string szFilePath;
    string szCreateTime;
}FileInfo;

vector<FileInfo>fileList;

//
void find(LPCTSTR lpPath,vector<FileInfo>& FileList)
{
	string szFind(lpPath);
	WIN32_FIND_DATA FindFileData;
	szFind+=_T("\\*.*");
	HANDLE hFind=::FindFirstFile(szFind.c_str(),&FindFileData);
	if(INVALID_HANDLE_VALUE==hFind) return;
//
	do
	{
		if(FindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
		{// dir
			if(FindFileData.cFileName[0] != '.') 
			{
				string szPath(lpPath);
				szPath+=_T("\\");
				szPath+=FindFileData.cFileName;
				//TRACE1("%s\n",szPath.c_str());
				find(szPath.c_str(),FileList);
			}
		}
		else
		{// file
			string strFileName=FindFileData.cFileName;//文件名
			//TRACE1("%s\n",strFileName.c_str());
			int at = strFileName.find_last_of('.'); 
			if(at<0) continue;// file without extention
			string ext=strFileName.substr(at);
			//TRACE1("%s\n",ext.c_str());
//
			at=0;// reset
			while(((int)at=suffixStr.find(ext,at))>=0)// find type
		//	if(stricmp(suffixStr.c_str(),_T(".txt"))==0)
			{// not suffixStr.c_str()==_T(".txt") ; never == !
				//afxDump << at << "\n";
				at+=ext.size();// move to seperetor '.'
				if(suffixStr[at] != '.') continue;// not wanted !
// 
				FILETIME ft=FindFileData.ftCreationTime;
				SYSTEMTIME st={0};
				TCHAR buf[64]={0};
				FileTimeToLocalFileTime(&(FindFileData.ftCreationTime),&ft);
				FileTimeToSystemTime(&ft,&st); 
				sprintf(buf,_T("%4d年%02d月%02d日%02d:%02d:%02d"),
					st.wYear,st.wMonth,st.wDay,st.wHour/*北京时间*/,st.wMinute,st.wSecond);
				string strFilePath=lpPath;
				FileInfo fi;
				fi.szFileName=strFileName;
				fi.szFilePath=strFilePath;
				fi.szCreateTime=buf;
				//TRACE1("%s\n",strFileName.c_str());
				FileList.push_back(fi);
			}
		}
	} while (::FindNextFile (hFind, &FindFileData));
}