Object-C  文件类的各种操作…

原文地址：Object-C  文件类的各种操作方法 作者：天地缘龙

本文来讲述 文件类的各种操作方法，示例如下：

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NSString  *fName=@"testfile.m";  
NSFileManager *fm=NULL;  
NSDictionary  *dict=NULL;  
 
 
fm=[NSFileManager defaultManager];  
 
if ([fm fileExistsAtPath:fName]==NO) {  
    NSLog(@"file not exist!");  
      
    return 1;  
}  
 
   if ([fm copyPath:fName toPath:@"newfile" handler:nil]==NO) {  
    NSLog(@"copy failed!");  
}  
 
if ([fm movePath:@"newfile" toPath:@"newfolder" handler:nil]==NO) {  
    NSLog(@"move failed");  
}  
 
if ((dict=[fm fileAttributesAtPath:@"newfolder" traverseLink:NO])==nil) {  
    NSLog(@"get file attributes failed");  
}  
 
NSLog(@"file size is %i bytes",[[dict objectForKey:NSFileSize] intValue]);  
 
 
if ([fm removeFileAtPath:@"newfolder" handler:nil]==YES) {  
    NSLog(@"remove successful!");  
}  
 NSString  *fName=@"testfile.m";
 NSFileManager *fm=NULL;
 NSDictionary  *dict=NULL;
 
 
 fm=[NSFileManager defaultManager];
 
 if ([fm fileExistsAtPath:fName]==NO) {
  NSLog(@"file not exist!");
  
  return 1;
 }
 
    if ([fm copyPath:fName toPath:@"newfile" handler:nil]==NO) {
  NSLog(@"copy failed!");
 }
 
 if ([fm movePath:@"newfile" toPath:@"newfolder" handler:nil]==NO) {
  NSLog(@"move failed");
 }
 
 if ((dict=[fm fileAttributesAtPath:@"newfolder" traverseLink:NO])==nil) {
  NSLog(@"get file attributes failed");
 }
 
 NSLog(@"file size is %i bytes",[[dict objectForKey:NSFileSize] intValue]);
 
 
 if ([fm removeFileAtPath:@"newfolder" handler:nil]==YES) {
  NSLog(@"remove successful!");
 }
 

NSData类的使用方法

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NSData  *fileData=NULL;  
 
 
fm=[NSFileManager defaultManager];  
 
fileData=[fm contentsAtPath:@"testfile.m"];  
 
if (fileData==nil) {  
    NSLog(@"read file failed!");  
}  
 
if ([fm createFileAtPath:@"file2" contents:fileData attributes:nil]==YES) {  
    NSLog(@"create file success!");  
}  
 NSData  *fileData=NULL;
 
 
 fm=[NSFileManager defaultManager];
 
 fileData=[fm contentsAtPath:@"testfile.m"];
 
 if (fileData==nil) {
  NSLog(@"read file failed!");
 }
 
 if ([fm createFileAtPath:@"file2" contents:fileData attributes:nil]==YES) {
  NSLog(@"create file success!");
 }
 

对路径的操作方法：

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NSString  *fName=@"testDir";  
NSFileManager *fm=NULL;  
//NSDictionary  *dict=NULL;  
NSString  *path=NULL;  
 
 
fm=[NSFileManager defaultManager];  
 
path=[fm currentDirectoryPath];  
 
NSLog(@"currentDir is: %@",path);  
 
//create a new directory  
[fm createDirectoryAtPath:fName attributes:nil];  
 
//rename the directory  
[fm movePath:fName toPath:@"newDir" handler:nil];    
 
//change currentdirectory  
[fm changeCurrentDirectoryPath:@"newDir"];  
 
path=[fm currentDirectoryPath];  
 
NSLog(@"currentDir is: %@",path); 
 NSString  *fName=@"testDir";
 NSFileManager *fm=NULL;
 //NSDictionary  *dict=NULL;
 NSString  *path=NULL;
 
 
 fm=[NSFileManager defaultManager];
 
 path=[fm currentDirectoryPath];
 
 NSLog(@"currentDir is: %@",path);
 
 //create a new directory
 [fm createDirectoryAtPath:fName attributes:nil];
 
 //rename the directory
 [fm movePath:fName toPath:@"newDir" handler:nil]; 
 
 //change currentdirectory
 [fm changeCurrentDirectoryPath:@"newDir"];
 
 path=[fm currentDirectoryPath];
 
 NSLog(@"currentDir is: %@",path);

枚举某个目录的所有内容：

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NSFileManager  *fm=NULL;  
NSDirectoryEnumerator *dirEnum=NULL;  
NSArray    *dirArray=NULL;  
NSString   *path=NULL;  
 
 
fm=[NSFileManager  defaultManager];  
 
path=[fm currentDirectoryPath];  
 
dirEnum=[fm enumeratorAtPath:path];  
 
while ((path=[dirEnum nextObject])!=nil) {  
    dirArray=[fm directoryContentsAtPath:[fm currentDirectoryPath]];  
}  
 
NSLog(@"%@",dirArray); 
 NSFileManager  *fm=NULL;
 NSDirectoryEnumerator *dirEnum=NULL;
 NSArray    *dirArray=NULL;
 NSString   *path=NULL;
 
 
 fm=[NSFileManager  defaultManager];
 
 path=[fm currentDirectoryPath];
 
 dirEnum=[fm enumeratorAtPath:path];
 
 while ((path=[dirEnum nextObject])!=nil) {
  dirArray=[fm directoryContentsAtPath:[fm currentDirectoryPath]];
 }
 
 NSLog(@"%@",dirArray);

NSFileHandle的使用示例：

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NSFileHandle  *inFile, *outFile;  
NSData   *buffer;  
 
 
inFile=[NSFileHandle fileHandleForReadingAtPath:@"testfile.m"];  
 
[[NSFileManager defaultManager]createFileAtPath:@"newfile1" contents:nil attributes:nil];  
 
outFile=[NSFileHandle fileHandleForWritingAtPath:@"newfile1"];  
 
[outFile truncateFileAtOffset:0];  
 
buffer=[inFile readDataToEndOfFile];  
 
[outFile writeData:buffer];  
 
[inFile closeFile];  
[outFile closeFile]; 

 

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