Nsfilemanager and Nsfilehandle

File Operation nsfilemanager  Common Nsfilemanager file Methods:-(BOOL) Contentsatpath:path                 reading data from a file-(bool) Createfileatpath:path contents: (BOOL) data attributes:attr       Write data to a file-(bool) Removefileatpath:path handler:handler   Delete a file-(bool) Movepath:from topath:to Handler:handler re- Name or move a file (to may already exist)-(bool) copypath:from topath:to handler:handler Copy file (to cannot exist)  -(bool) Contentsequalatpath: path1 andpath:path2     Compare two files content  -(BOOL) fileexistsatpath:path     test file exists  - (bool) Isreadablefileatpath:path test file exists and can perform read operation  -(BOOL) Iswritablefileatpath:path test file exists and can perform write operation  -(nsdictionary *) Fileattributesatpath:path Traverselink: (BOOL) flag   Get the properties of the file  - (BOOL) changefileattributes:attr atpath:path                      / nbsp; Change the properties of a file   nsfilemanager object creation:    Nsfilemanager *fm;    FM = [Nsfilemanager defAultmanager]; nsdictionary *attr =[fm fileattributesatpath:fname Traverselink:no]; File properties              nslog (@ "File size is:%i bytes", [[attr Objectforkey:nsfilesize] Intv Alue]); NSData *data =[fm contentsatpath:@ "filename"];//file contents    Common Nsfilemanager Directory method:-(NSString * ) Currentdirectorypath                       Get current directory  -(BOOL) Chan Gecurrentdirectorypath:path                 Change current directory  -(BOOL) copypath:from Topath:to handler:handler       Copy directory structure, to cannot already exist  -(BOOL) Createdirectoryatpath:path Attributes:attr     Create directory  -(BOOL) Fileexistsatpath:path isdirectory: (BOOL *) flag       Test whether the file is a directory (flag storage structure yes/no)  -(Nsarray *) Contentsofdirectoryatpath:path             & nbsp; List contents of directory  -(Nsdirectoryenumerator *) Enumeratoratpath:path   Enumerating contents of directory  -(BOOL) Removefileatpath:patH handler:handler     Delete empty directory  -(BOOL) movepath:from topath:to handler:handler     Rename or move a directory, To cannot be an already existing   path= [FM Currentdirectorypath]; Nsarray *dirarray; Nsdirectoryenumerator *DIRENU; DIRENU = [FM Enumeratoratpath:path]; NSLog (@ "Contents of%@\n", path); BOOL flag;while ((path = [Direnu nextobject])!=nil) {            NSLog (@ "%@", path);  &NB Sp         [FM fileexistsatpath:path isdirectory:&flag];            if ( Flag = = YES)             [Direnu skipdescendents]; Skip subdirectories  }path= [FM Currentdirectorypath];D IRARRAY = [FM Contentsofdirectoryatpath:path]; NSLog (@ "%@", Dirarray);  Common path tool function NSString * NSUSERNAME (); Returns the login name of the current user  nsstring * Nsfullusername (); Returns the full user name of the current user  nsstring * Nshomedirectory (); Returns the path to the current user's home directory  nsstring * Nshomedirectoryforuser (); Returns the user's home directory  nsstring * Nstemporarydirectory (); Returns the path directory that can be used to create temporary files  &nbSP; Common Path Tool Method-(NSString *) pathwithcomponents:components                   &NBS P     construct valid paths based on elements in Components  -(Nsarray *) pathcomponents               &NBS P                            -to get the various parts of the path (NSString * ) lastpathcomponent                           &NBSP ;         Extract the last component of the path  -(NSString *) pathextension                                  -        Path extension (NSString *) ) Stringbyappendingpathcomponent:path                     Add path to the end of an existing path  -(NSString *) stringbyappendingpathextension:ext                   &NBS P Add extension name to the last component of the path -(NSString *) stringbydeletingpathcomponent                     &NB Sp     Delete the last part of the path  -(NSString *) stringbydeletingpathextension             & nbsp             Delete the last section of the path extension  -(NSString *) Stringbyexpandingtildeinpath     & nbsp                       to expand the generation of characters in the path to the user home directory (~) or the designated household directory (~user)  - (NSString *) Stringbyresolvingsymlinksinpath                       & nbsp Attempt to parse a symbolic link in a path  -(NSString *) Stringbystandardizingpath                   and nbsp           standardize paths by trying to parse ~ 、..、.、 and Symbolic Links  -  Use path Nspathutilities.h tempdir = Nstemporarydirectory (); The directory name of the temporary file  path = [FM Currentdirectorypath]; [Path lastpathcomponent]; Extract the last file name from the path  fullpath = [path StringbyapPendingpathcomponent:fname]; Append the file name to the end of the road  extenson = [FullPath pathextension]; pathname filename extension  homedir = nshomedirectory (); user's home directory  component = [Homedir pathcomponents];   Each part of the path   nsprocessinfo class: Allows you to set or retrieve various types of information for a running application (Nsprocessinfo *) processinfo                                   Return current process information-(nsarray*) Argum Ents                                 &NBSP ;         return parameters of the current process as NSString object numbers-(nsdictionary *) environment           &NBS P                       Returns a variable/value pair dictionary. Describes the current environment variable-(int) processidentity                                           return process identification-(NSString *) processName           & nbsp &nbSp                         return process name-(NSString *) Globallyuniquestrin G                               Each call to this method will return a different single value A string that can be used to generate a single-value temporary file name   -(NSString *) hostname                   &NB Sp                       Return the name of the host system  -(unsigned int) operatingsystem                                 back to represent the operating system Digital  -(NSString *) operatingsystemname                       &NBS P             return operating system name  -(NSString *) operatingsystemversionstring       &N Bsp                             Return operating system current version-(void) Setproc Essname: (Nsstring *) name                             &N Set the current process name to name  the file type in the filter array  : [filelist pathsmatchingextensions:[nsarrayarraywithobject:@ "JPG" ]];///////////////////////////////////////////////////////////////////////////////////////////////////////////Basic file Operation Nsfil Ehandle Common Nsfilehandle methods (Nsfilehandle *) Filehandleforreadingatpath:path                         Open a file ready to read (Nsfilehandle *) Filehandleforwritingatpath:path                         Open a file ready to write (Nsfilehandle * ) Filehandleforupdatingatpath:path                         Open a text Ready to update (read and Write)-(NSData *) availabledata                         & nbsp                         Return available data from device or channel-(NSData *) readdatatoendoffile                     &NB Sp                       to read the rest of the data until the end of the file (up to Uint_max bytes)-(NSData *) Readdat Aoflength: (unsigned int) bytes reads a specified number of bytes content from a file-(void) Writedata:data               and nbsp   writes data to file-(unsigned long long) offsetinfile       Gets the offset of the current file-(void) Seektofileoffset:offset         Set the offset of the current file  -(unsigned long) seektoendoffile       Position the offset of the current file at the end of the file-(void) Truncatefileatoffset:offset         Set the length of the file to offset bytes-(void) CloseFile                           Close file  Get File Size Using the C FILE type:

int Getfilesizefrompath (char * path)
{
File * file;
int filesizebytes = 0;
File = fopen (path, "R");
if (file>0) {
fseek (file, 0, seek_end);
Filesizebytes = ftell (file);
fseek (file, 0, Seek_set);
fclose (file);
}
return filesizebytes;
}

Or in XCode use the Nsfilemanager:

Nsfilemanager * FileManager = [[Nsfilemanager alloc]init];
if ([FileManager fileexistsatpath:[self Getcompletepath] isdirectory:&isdirectory]) {

nsdictionary * attributes = [FileManager attributesofitematpath:[self Getcompletepath] error:nil];

File size
NSNumber *thefilesize;
if (thefilesize = [Attributes Objectforkey:nsfilesize])

_filesize= [Thefilesize Intvalue];
}

Nsfilemanager and Nsfilehandle