VC + + MFC file Mobile Copy Delete rename traversal operation __c++

1. To determine whether a file exists

Using CFile class and CFileStatus class to judge

CFileStatus Filestatus;
if (CFile::GetStatus (_t ("D://softist.txt"), Filestatus)
AfxMessageBox (_t ("file exists"));
Else
AfxMessageBox (_t ("file does not exist");

Using the CFileFind class to judge

CFileFind FileFind;

CString strpathname = _t ("D://softist.txt");

if (filefind. FindFile (strpathname))

AfxMessageBox (_t ("file exists"));

Else

AfxMessageBox (_t ("file does not exist");

Using API function FindFirstFile, this function can also determine attributes such as file attributes, date, size, and so on. Cases:

Win32_find_data Findfiledata;
HANDLE Hfind;
Hfind = FindFirstFile (_t ("D://softist.txt"), &findfiledata);
if (hfind = = INVALID_HANDLE_VALUE)
{
AfxMessageBox (_t ("file does not exist");
}
Else
{
AfxMessageBox (_t ("file exists"));
FindClose (hfind);
}

2. File date operation. The following is to obtain "d://softist.txt" File modification time, trace, and then the file modification time to 2000-12-03 12:34:56.

HANDLE hfile;

filetime filetime;

filetime localtime;

SYSTEMTIME SYSTEMTIME;

 

hfile = CreateFile (_t ("D://softist.txt"), Generic_read | Generic_write,

0, NULL, open_existing, file_attribute_normal, null);

 

if (hfile!= invalid_handle_value)

{

getfiletime (hfile, NULL, NULL, &filetime); Get UTC File Time

filetimetolocalfiletime (&filetime, &localtime);//change to local time

filetimetosystemtime (&localtime, &systemtime); Change to System time format

 

TRACE ("%04d-%02d-%02d%02d:%02d:%02d/r/n",

systemtime.wyear, Systemtime.wmonth, Systemtime.wday,

Systemtime.whour, Systemtime.wminute, systemtime.wsecond);

 

//Change the file time into 2000-12-03 12:34:56

systemtime.wyear = Systemtime.wmonth = Systemtime.wday = 3;

Systemtime.whour = Systemtime.wminute = Systemtime.wsecond =;

SystemTimeToFileTime (&systemtime, &localtime);//change file time format

localfiletimetofiletime (&localtime, &filetime);//change to UTC time

setfiletime (hfile, NULL, NULL, &filetime); Set UTC file Time

CloseHandle (hfile);

}

3. Set file properties

BOOL setfileattributes (LPCTSTR lpfilename, DWORD dwfileattributes);

The meaning of dwFileAttributes

File_attribute_archive Save File

File_attribute_hidden hidden files

File_attribute_normal usual files

File_attribute_readonly read-only file

File_attribute_system System files

Cases:

SetFileAttributes (_t ("D://softist.txt", file_attribute_readonly);

copying, moving, deleting, renaming of files

1. Replication API for files

BOOL CopyFile (LPCTSTR lpexistingfilename, LPCTSTR lpnewfilename, bool bfailifexists);

Bfailifexists is used to determine whether to abort the copy operation if the target file already exists, and return false. For example, "D://softist1.txt" is copied to "D://softist2.txt", even if "d://softist2.txt" already exists.

BOOL BRet = CopyFile (_t ("D://softist1.txt"), _t ("D://softist2.txt"), FALSE);

2. Mobile API for files

BOOL MoveFile (LPCTSTR lpexistingfilename, LPCTSTR lpnewfilename);

This function can be moved to a file, or directory (including subdirectories), for example,

MoveFile (_t ("D://softist.txt"), _t ("D://softist2.txt"));

The following APIs carry the option dwflags, moving files, or directories (including subdirectories).

BOOL MoveFileEx (LPCTSTR lpexistingfilename, LPCTSTR lpnewfilename, DWORD dwflags);

The meaning of dwflags:

movefile_replace_existing if the target file exists to replace it.

Movefile_delay_until_reboot file Move preparation and perform the move job the next time the system is started.

3. deleting files

Api:

BOOL DeleteFile (LPCTSTR lpfilename);

Mfc:

static void PASCAL Cfile::remove (LPCTSTR lpszfilename);

4. File renamed MFC:

tchar* poldname = _t ("Oldname_file.dat");

tchar* pnewname = _t ("Renamed_file.dat");

Try

{

cfile::rename (Poldname, pnewname);

}

catch (cfileexception* pEx)

{

TRACE (_t ("File%20s not found, cause =%d/n"), Poldname,

pex->m_cause);

Pex->delete ();

}

Traverse file Directory

Traverse the file directory, that is, the file in a directory and subdirectories of the file names out. This article is a note of an example of a CFileFind class. The following program starts from a directory and puts all the members in this directory on the level trace to the debug output screen.

void Travelfolder (CString strdir, int ndepth)

{

CFileFind FileFind; Declaring CFileFind type variables

CString Strwildpath = Strdir + _t ("//*.*"); All files are listed.

if (FileFind. FindFile (Strwildpath, 0))//Start retrieving files

{

BOOL bRet = TRUE;

while (BRet)

{

BRet = FileFind.                 FindNextFile (); Enumerating a file

if (FileFind. Isdots ())//if yes. Or.. Do the next

Continue

for (int i = 0; i < ndepth i + +)//Level space print

{

TRACE (_t (""));

}

if (!filefind. Isdirectory ())//is not a subdirectory, print out the file name

{

CString strtextout = Strdir + CString (_t ("//")) + FileFind. GetFileName ();

TRACE (_t ("file =%s/r/n"), strtextout);

}

else//If it is a subdirectory, call the function recursively

{

CString strtextout = Strdir + CString (_t ("//")) + FileFind. GetFileName ();

TRACE (_t ("dir =%s/r/n"), strtextout);

Travelfolder (strtextout, ndepth + 1);//recursively call the function to print a file in a subdirectory

}

}

FileFind. Close ();

}

}

Test, print all files and subdirectories in the/temp of D disk to the debug output screen.

void Test ()

{

Travelfolder (CString (_t ("D://temp")), 0);

}

File directory Operations

1. Create a directory (API)

BOOL createdirectory (LPCTSTR pstrdirname);//pstrdirname is full path

2. Delete directory (API)

BOOL removedirectory (LPCTSTR lppathname);

3. To determine whether a directory exists (Shell Function)

#include <shlwapi.h> #pragma comment (lib, "Shlwapi.lib") if (Pathisdirectory (_t ("D://temp")) AfxMessageBox (_t ( "Existence"); else AfxMessageBox (_t ("nonexistent"));

4. Get current directory (API)

DWORD GetCurrentDirectory (DWORD nbufferlength, LPTSTR lpbuffer);

5. Gets the directory where the execution file is located (API)

DWORD GetModuleFileName (Hmodule hmodule, LPTSTR lpFileName, DWORD nsize);

6. Get feature directory (Shell function)

BOOL SHGetSpecialFolderPath (HWND hWndOwner, LPTSTR lpszpath, int nfolder, BOOL fcreate);

Example: Read my file directory

TCHAR szdirfile[1024];
memset (szdirfile, 0, sizeof (szdirfile));
BOOL BRet = SHGetSpecialFolderPath (null,szdirfile,csidl_personal,true);
if (BRet)
{
AfxMessageBox (Szdirfile);
}

7. Select the dialog box interface for the directory

Use Shell function to make a dialog box interface for selecting a directory

#include <shlobj.h>

INT CALLBACK _browsecallbackproc (HWND hwnd, UINT umsg, LPARAM LPARAM, LPARAM pData)

{

TCHAR Szdir[max_path];

Switch (umsg)

{

Case bffm_initialized:

WParam is TRUE since you are passing a path.

It would is FALSE if you were passing a pidl.

SendMessage (hwnd, Bffm_setselection, TRUE, (LPARAM) pData);

Break

Case bffm_selchanged:

Set the Status window to the currently selected path.

if (SHGetPathFromIDList (lpitemidlist) LParam, Szdir))

{

SendMessage (hwnd,bffm_setstatustext,0, (LPARAM) szdir);

}

Break

}

return 0;

}

CString Getfolderfullpath (LPCTSTR lpszdefault)

{

TCHAR Buffdisplayname[max_path];

TCHAR Fullpath[max_path];

Browseinfo Browseinfo;

Lpitemidlist lpitemidlist;

ZeroMemory (&browseinfo, sizeof (Browseinfo));

Browseinfo.pszdisplayname = Buffdisplayname;

Browseinfo.lpsztitle = _t ("Please select Directory");

Browseinfo.ulflags = Bif_returnonlyfsdirs;

Browseinfo.lparam = (lParam) Lpszdefault;

BROWSEINFO.LPFN = _browsecallbackproc;

if (!) ( Lpitemidlist = SHBrowseForFolder (&browseinfo)))

{

AfxMessageBox (_t ("No Directory Selected"));

Return CString (_t (""));

}

Else

{

SHGetPathFromIDList (Lpitemidlist, FullPath);

CoTaskMemFree (lpitemidlist);

Return CString (FullPath);

}

}

void Ctest77dlg::onbnclickedbutton1 ()

{

CString Strfolderfullpath = Getfolderfullpath (_t ("d://temp"));

if (Strfolderfullpath!= _t (""))

AfxMessageBox (Strfolderfullpath);

}