VC ++ MFC file and folder operations

File Attributes

1. Determine whether the file exists

Use the cfile class and cfilestatus class to determine

Cfilestatus filestatus;
If (cfile: getstatus (_ T ("D: // softist.txt"), filestatus ))
Afxmessagebox (_ T ("file exists "));
Else
Afxmessagebox (_ T ("file does not exist "));

Use the cfilefind class to determine

Cfilefind FileFind;

Cstring strpathname = _ T ("D: // softist.txt ");

If (FileFind. findfile (strpathname ))

Afxmessagebox (_ T ("file exists "));

Else

Afxmessagebox (_ T ("file does not exist "));

 

 


 

 

Use the findfirstfile API function to determine the file attributes, date, size, and other attributes. Example:

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 operations. The following figure shows the modification time of the file "D: // softist.txt". After trace, change the modification time of the file to 2000-12-03 12:34:56.

Handle hfile;

Filetime;

Filetime localtime;

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 the UTC file time

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

Filetimetosystemtime (& localtime, & systemtime); // change to the 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 to 12:34:56

Systemtime. wyear = 2000; systemtime. wmonth = 12; systemtime. wday = 3;

Systemtime. whour = 12; systemtime. wminute = 34; systemtime. wsecond = 56;

Systemtimetofiletime (& systemtime, & localtime); // convert it to the file time format

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

Setfiletime (hfile, null, null, & filetime); // sets the UTC file time.

Closehandle (hfile );

}

3. Set file attributes

Bool setfileattributes (lpctstr lpfilename, DWORD dwfileattributes );

Significance of dwfileattributes

File_attribute_archive

File_attribute_hidden: hide a file

File_attribute_normal normal file

File_attribute_readonly read-only file

File_attribute_system System File

Example:

Setfileattributes (_ T ("D: // softist.txt", file_attribute_readonly );

Copy, move, delete, and rename an object

1. file copy API

Bool copyfile (maid, maid );

Bfailifexists is used to determine whether to abort the copy operation if the target file already exists. False is returned. For example, copy "D: // softist1.txt" to "D: // softist2.txt", even if "D: // softist2.txt" already exists.

Bool Bret = copyfile (_ T ("D: // softist1.txt"), _ T ("D: // softist2.txt"), false );

 

 


 

 

2. File mobile API

Bool movefile (maid, maid );

This function can be used to move a file or directory (including sub-Directories), for example,

Movefile (_ T ("D: // softist.txt"), _ T ("D: // softist2.txt "));

The following API carries the option dwflags to move a file or directory (including subdirectories ).

Bool movefileex (maid, maid, DWORD dwflags );

Significance of dwflags:

Movefile_replace_existing: Specifies whether to replace the target file if it exists.

Move the movefile_delay_until_reboot file and run the mobile job the next time you start the system.

3. delete an object

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 % 20 s not found, cause = % d/N"), poldname,

Pex-> m_cause );

Pex-> Delete ();

}

Traverse file directories

Traverse the file directory to retrieve all the files in a directory and the file names in the subdirectories. This document is the note of the cfilefind class example. The following program starts from a directory and traces all the members in the directory to the debug output screen in layers.

Void travelfolder (cstring strdir, int ndepth)

{

Cfilefind FileFind; // declare the cfilefind Type Variable

Cstring strwildpath = strdir + _ T ("// *. *"); // all files are listed.

If (FileFind. findfile (strwildpath, 0) // start File Retrieval

{

Bool Bret = true;

While (BRET)

{

Bret = FileFind. findnextfile (); // enumerate a file

If (FileFind. isdots () // If yes. or.

Continue;

For (INT I = 0; I <ndepth; I ++) // print layers with spaces

{

Trace (_ T (""));

}

If (! FileFind. isdirectory () // is not a subdirectory. Print the file name.

{

Cstring strtextout = strdir + cstring (_ T ("//") + FileFind. getfilename ();

Trace (_ T ("file = % S/R/N"), strtextout );

}

Else // if it is a subdirectory, recursively call this function

{

Cstring strtextout = strdir + cstring (_ T ("//") + FileFind. getfilename ();

Trace (_ T ("dir = % S/R/N"), strtextout );

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

}

}

FileFind. Close ();

}

}

// Test and print all the files and subdirectories in/temp of drive D 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); // The pstrdirname is the full path.

2. delete a directory (API)

Bool removedirectory (lpctstr lppathname );

3. Determine whether a directory exists (shell function)

# Include <shlwapi. h> # pragma comment (Lib, "shlwapi. lib ") if (pathisdirectory (_ T (" D: // Temp ") afxmessagebox (_ T (" ")); else afxmessagebox (_ T ("nonexistent "));

 

 


 

 

4. Obtain the current directory (API)

DWORD getcurrentdirectory (DWORD nbufferlength, lptstr lpbuffer );

5. Obtain the directory of the execution file (API)

DWORD getmodulefilename (hmodule, lptstr lpfilename, DWORD nsize );

6. Obtain the function directory (shell function)

Bool shgetspecialfolderpath (hwnd hwndowner, lptstr lpszpath, int nfolder, bool fcreate );

Example: Read my archive directory

Tchar szdirfile [1024];
Memset (szdirfile, 0, sizeof (szdirfile ));
Bool Bret = shgetspecialfolderpath (null, szdirfile, csidl_personal, true );
If (BRET)
{
Afxmessagebox (szdirfile );
}

7. Select a directory dialog box

You can use shell function to display a dialog box for selecting directories.

 

# Include <shlobj. h>

Int callback _ browsecallbackproc (hwnd, uint umsg, lparam, lparam pdata)

{

Tchar szdir [max_path];

Switch (umsg)

{

Case bffm_initialized:

// Wparam is true since you are passing a path.

// It wocould be 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;

Lpitemidlist;

 

Zeromemory (& browseinfo, sizeof (browseinfo ));

Browseinfo. pszdisplayname = buffdisplayname;

Browseinfo. lpsztitle = _ T ("select a 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 );

}

 

This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/susik/archive/2010/08/25/5838841.aspx