Nsfilehandle&&nsfilemanage

/*********** Read all file contents ************/

nsfilehandle *handle1 = [nsfilehandle filehandleforreadingatpath: FilePath]; returns the filehandle of the Read file

nsdata *data1 = [handle1 readdatatoendoffile]; read to the end of the file to get the data in the file

nsstring *readstring=[[nsstring alloc]initwithdata:d ata1 encoding: Nsutf8stringencoding]; //Convert data into a string

NSLog(@ "%@", readString);

/************* Read half of the file to the end ************/

nsfilehandle *handle=[nsfilehandle filehandleforreadingatpath: FilePath];

nsinteger length=[handle availabledata]. Length; returns the length of valid data in a file

[Handle Seektofileoffset: length/2]; jump to the content of the file half of the place

nsdata *data=[handle readdatatoendoffile]; read to end of file

nsstring *string=[[nsstring alloc]initwithdata:d ata encoding: nsutf8stringencoding];

NSLog(@ "%@", String);

}

-(void) Writeingfile: (nsstring *) filePath

{

// write data to the end of the file (append)

nsfilehandle *handle2=[nsfilehandle filehandleforupdatingatpath: FilePath]; Prepare for updates

[Handle2 seektoendoffile]; jump to end of file

nsstring *addstring=@ " Shang education ";

nsdata *writedata=[addstring datausingencoding:nsutf8stringencoding]; converting a string into data

[Handle2 writedata: writedata]; Write Data

[Handle2 closefile]; Close file

}

-(void) Copyingfile: (nsstring *) filePath

{

// Find the original file path

nsstring *old_filepath = filePath;

// Specify a new file path (file does not exist)

nsstring *new_filepath = @ "/users/scjy/hello/ios.txt";

// Create a File manager to prepare for creating a new file

nsfilemanager *filemanager=[nsfilemanager defaultmanager];

// Create a new file (no data in the file at this time)

BOOL issuccess=[filemanager createfileatpath: New_filepath contents:nil Attributes:nil];

if (issuccess) {

NSLog(@ " Create success ");

//1. read data from the original file:filehandleforreadingatpath

nsfilehandle *old_handle=[nsfilehandle filehandleforreadingatpath: Old_filepath];

nsdata *old_data=[old_handle readdatatoendoffile];

//2. writes the data obtained from the original file to a new file:filehandleforwritingatpath

nsfilehandle *new_handle=[nsfilehandle filehandleforwritingatpath: New_filepath];

[New_handle writedata: old_data];

[Old_handle closefile];

[New_handle closefile];

}

Else

{

NSLog(@ " Create failed ");

}

}

-(void) Creatplistfile

{

nsfilemanager *filemanager=[nsfilemanager defaultmanager];

nsstring *path=@ "/users/scjy/hello/student.plist";

//fileexistsatpath: Judging if the file is not present

If (![ FileManager fileexistsatpath:p Ath]) {

NSLog(@ " file does not exist, start creating file ");

[FileManager createfileatpath:p ath contents:nil attributes:nil] ; // Create file

//nsdictionary *dic=[nsdictionary dictionarywithobject:@ "Li heping " forkey:@ "name"];

nsarray *array=[nsarray arraywithobjects:@ "A",@ "B", Nil];

[Array writetofile:p ath atomically:YES]; Write file

}

Else

{

NSLog(@ " file already exists ");

}

nsarray *array1=[nsarray arraywithcontentsoffile:p ath];

NSLog(@ "%@", array1);

}

class Notes/////////////////////////////////////////////////// /

#if 0

Moving Files

Nsfilemanager *manager=[nsfilemanager Defaultmanager];

NSString *path1=@ "/users/liheping/desktop/move.txt";

NSString *path2=@ "/users/liheping/desktop/test1/move.txt";

Nserror *error=nil;

can modify the name of the file (path2 cannot exist, indicating the file moved over)

BOOL isok=[manager moveitematpath:path1 topath:path2 error:&error];

If (IsOK) {

NSLog (@ " operation succeeded ");

}Else

NSLog (@ " operation failed :%@", [Error localizeddescription]);

**/

// renaming

Nsfilemanager *manager=[nsfilemanager Defaultmanager];

NSString *path1= @ "/USERS/LIHEPING/DESKTOP/1";

NSString *path2=@ "/USERS/LIHEPING/DESKTOP/2";

Nserror *error=nil;

BOOL isok=[manager moveitematpath:path1 topath:path2 error:&error];

if (IsOK) {

NSLog (@ " operation succeeded ");

}Else

NSLog (@ " operation failed :%@", [Error localizeddescription]);

// copy:

Nsfilemanager *manager=[nsfilemanager Defaultmanager];

NSString *path1=@ "/users/liheping/desktop/move/test.txt";

NSString *path2=@ "/users/liheping/desktop/2/test1.txt";

Nserror *error=nil;

BOOL isok=[manager copyitematpath:path1 topath:path2 error:&error];

if (IsOK) {

NSLog (@ " operation succeeded ");

}Else

NSLog (@ " operation failed :%@", [Error localizeddescription]);

}

#endif

Nsfilehandle&&nsfilemanage