C file operations

1. delete an object

1. c call the doscommand: System (char * cmd); for example, system ("del D: \ Chang \ xxx.txt"); delete the file

2. Call API: delete a file: int remove (char * filename); Return 0 success-1 Failure

3. deletefile ("D: \ new.txt"); // delete an object

 
Bool deletefile (lpctstr filename );
 

4. _ unlink (filename) // return-1 if the connection fails.

 

Ii. Rename (you can also use the move and copy mentioned later)

Rename (oldname, newname) // if the call succeeds, 0 is returned.

 

3. Create a directory

1. mkdir ("C: \ info \ world"); // returns-1 if the error occurs.

2. Single-level (SA is a security attribute, and null is the default value). You need to customize multi-level directories.

 
Bool createdirectory (lpctstr dirname, lpsecurity SA );
 

3. Multi-Level

System ("Mkdir c: \ A \ B \ c");
 

 

4. list file information in a directory

 
VoidListall (Char* Path ){
Win32_find_data finddata;
Handle listfile;
 

Strcat (path, "\ *"); // indicates listing all files
 //  Findfirstfile ("D: \ htdocs \ *. txt", & finddata)  
 Listfile = findfirstfile (path, & finddata );
 Do {
 If (Lstrcmp (finddata. cfilename, text ("  .  " ) = 0 |
Lstrcmp (finddata. cfilename, text ( "  ..  " ) = 0 )
 Continue ;
Printf ( "  % S \ t  " , Finddata. cfilename );
 If (Finddata. dwfileattributes & file_attribute_hidden)
Printf ( "  Hidden \ t  " );
 If (Finddata. dwfileattributes & file_attribute_directory)
Printf ( "  Dir \ t  " );
Printf ( "  \ N  " );
} While (Findnextfile (listfile, & finddata ));
}

5. File Read modification time

# Include <windows. h>
# Include <stdio. h>
# Include <stdlib. h>
# Include <Io. h>
DWORD showfiletime (pfiletime lptime );
 Int Main ( Int Argc, Char * Argv [])
{
 //  File Attribute Structure  
 Win32_file_attribute_data wfad;
 // Get file attributes  
 Getfileattributesex ( "  D: \ htdocs \ index.html  " , Getfileexinfostandard, & wfad );

Showfiletime (& (wfad. ftlastwritetime ));
 //  Showfilesize (wfad. nfilesizehigh, wfad. nfilesizelow );  
 
 Return   0 ;
}

DWORD showfiletime (pfiletime lptime ){
Filetime ftlocal;
Systemtime st;
Filetimetolocalfiletime (lptime, & ftlocal );
Filetimetosystemtime (& ftlocal, & St );

Printf ( "  % 4D/% 02d/% 02d  " , St. wyear, st. wmonth, st. wday );
 Return   0 ;
}

6. Read File Size

1.

The third parameter of findfirst can have the following values:

# Define fa_rdonly 0x01/* read only attribute */

# Define fa_hidden 0x02/* hidden file */

# Define fa_system 0x04/* System File */

# Define fa_label 0x08/* volume label */

# Define fa_direc 0x10/* directory */

# Define fa_arch 0x20/* archive */

# Include <windows. h>
# Include <stdio. h>
# Include <stdlib. h>
# Include <Io. h>
DWORD showfilesize (DWORD dwhigh, DWORD dwlow );
 Int Main ( Int Argc,Char * Argv [])
{
 //  File Attribute Structure  
 Win32_file_attribute_data wfad;
 //  Get file attributes  
 Getfileattributesex ( "  D: \ test.txt  " , Getfileexinfostandard, & wfad );

Showfilesize (wfad. nfilesizehigh, wfad. nfilesizelow );

 Return  0 ;
}

DWORD showfilesize (DWORD dwhigh, DWORD dwlow ){
Ulonglong lifilesize;
Lifilesize = dwhigh;
Lifilesize <= Sizeof (DWORD )* 8 ;
Lifilesize + = dwlow;

Printf ( "  % I64u \ n  " , Lifilesize );
 Return   0 ;
}

2. directly call system functions for greater convenience. This parameter can be set to null.

 
DWORD getfilesize (handle HF, lpdword hCG );
 

 

7. traverse all files

# Include <windows. h>
# Include <stdio. h>
# Include <stdlib. h>

DWORD listallfile (lpstr path );
DWORD listallfile (lpstr path ){
Win32_find_data finddata;
Handle listfile;
 Char Fullpath [ 100 ];
 Char Temppath [ 100 ];

Lstrcpy (temppath, PATH );
Lstrcat (temppath, "  \\*  " );

Listfile = findfirstfile (temppath, & finddata );
 Do {
 If (Lstrcmp (finddata. cfilename, text ( "  .  " ) = 0 |
Lstrcmp (finddata. cfilename, text ( " ..  " ) = 0 )
 Continue ;
 //  Printf ("% s \ t", finddata. cfilename );
  //  Create full path  
 Wsprintf (fullpath, "  % S \ % s  " , Path, finddata. cfilename );
Printf ( " % S \ n  " , Fullpath );

 /*  If (finddata. dwfileattributes & file_attribute_hidden)
Printf ("Hidden \ t ");  */ 
 If (Finddata. dwfileattributes & file_attribute_directory ){
Listallfile (fullpath );
}
} While (Findnextfile (listfile, & finddata ));

 Return   0 ;
}
 Int Main ( Int Argc, Char * Argv [])
{
Listallfile ( "  E: \ linuxbooks  " );
 Return   0 ;
}

8. File Read operations

# Include <stdio. h>
# Include <stdlib. h>

IntMain ()
{
IntCh;
File * FP;
Fp = fopen ("Aaa.txt","W");
While(CH = GETC (FP ))! = EOF ){
Putchar (CH );
}
Fclose (FP );
Return 0;
}
 

 

9. delete a directory

1. rmdir ("UGG"); // delete a directory, empty

2. delete an empty directory.

 
Bool removedirectory (lpctstr path );
 

3. System ("rmdir/S/q ugg"); // Delete non-empty folders

 

10. Check the file existence and permissions

1.

 
Int_ Access (Const Char* Path,IntMode );
Mode Value Checks file
00Existence only
02Write Permission
04Read Permission
06Read and Write Permission
 

2. User-Defined Functions

 Bool fileexists (lpctstr filename, bool dircheck) {DWORD DWA = Getfileattributes (filename );  If (DWA =0 xffffffff  ){  /*  Error  */          Return  False ;}  /*  Is a dir  */      If (DWA & file_attribute_directory) = File_attribute_directory ){  If  (Dircheck ){  Return True ;}  Else  {  Return  False ;}}  Else  {  /*  Is a file  */          If (! Dircheck ){  Return  True ;}  Else  { Return  False ;}}} 

 

11. Copying and Moving Files

 //  Not Overwrite  If (Copyfile ( "  D: \ test.txt  " , "  C: \ test.txt  "  , True) puts (  "  File copied  " );  If (Copyfile ( "  D: \ test.txt  " , "  C: \ test.txt  "  , False) puts (  "  File overwritten  "  );  If (Movefile ( "  D: \ test.txt " , "  C: \ test.txt  "  ) Puts (  "  Move  " );

Another mobile function prototype (overwritable) dwflags: movefile_replace_existing (replace the original file)

 
Bool movefileex (maid SRC, maid, DWORD dwflags );