Foundation 框架 NSFileManager，NSData 简单的文件操作

一、简单展示NSFileManager的使用

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {
        //创建文件管理对象
        NSFileManager *fm = [NSFileManager defaultManager];
        //要操作的文件名
        NSString *fname = @"myfile";
        //获取文件的字典
        NSDictionary *attr;
        //当前路径
        NSString *path;
        //获取当前路径
        path = [fm currentDirectoryPath];
        //NSLog(@"\nThe current path is : %@", path);

        //检测文件是否存在
        if ([fm fileExistsAtPath: fname] == NO) {
            //如果不存在则建立一个文件
            [fm createFileAtPath: fname contents: NULL attributes:nil];
            //NSLog(@"\nThe file is not exist!");
            //return 0;
        }
        //拷贝创建一个新文件， 新文件若已存在则报错
        if ([fm copyItemAtPath: fname toPath: @"newFile" error: NULL] == NO) {
            NSLog(@"\n Can't copy the file");
            return ;
        }
        //检测两个文件内容是否相同
        if ([fm contentsEqualAtPath: fname andPath: @"newFile"] == NO) {
            NSLog(@"\nThe contents is not same");
            return ;
        }
        //移动或者改名文件
        if ([fm moveItemAtPath: @"newFile"  toPath: @"myFile2" error:NULL] == NO) {
            NSLog(@"\nCan't change the name");
            return ;
        }
        //获取文件数据字典
        if ((attr = [fm attributesOfItemAtPath: fname error:NULL]) == nil) {
            NSLog(@"\nGet attributets failed");
            return ;
        }
        //文件大小
        NSLog(@"%@", attr[NSFileSize]);
        //文件类型
        NSLog(@"%@", attr[NSFileType]);
        //创建者
        NSLog(@"%@", attr[NSFileOwnerAccountName]);
        //
        NSLog(@"%@", attr[NSFileCreationDate]);
        //显示文件内容
        NSLog(@"\n Show the file contents");
        NSLog(@"\n%@", [NSString stringWithContentsOfFile: fname encoding:NSUTF8StringEncoding error:NULL]);
    }
    return ;
}

二、通过NSData完成副本制作

 int main(int argc, const char * argv[])
 {

     @autoreleasepool {
         //通过NSDate来完成文件副本制作
         NSFileManager *fm = [NSFileManager defaultManager];
         NSData *dt;

         dt = [fm contentsAtPath: @"myfile"];

         if (dt == nil) {
             NSLog(@"Read file failed....");
             return ;
         }

         //将缓冲区NSData中的内容复制到文件中
         if ([fm createFileAtPath:@"myFavoriteFile" contents: dt attributes:nil] == NO) {
             NSLog(@"Creat backups failed");
             return ;
         }

         //读出文件内容
         NSLog(@"\n%@", [NSString stringWithContentsOfFile:@"myFavoriteFile" encoding: NSUTF8StringEncoding error:NULL]);
     }
     return ;
 }

三、简单的目录操作

 #import <Foundation/Foundation.h>

 int main(int argc, const char * argv[])
 {

     @autoreleasepool {
         NSString *newDir = @"newDir";
         NSString *currentPath;
         NSFileManager *fm = [NSFileManager defaultManager];

         //获取当前路径
         currentPath = [fm currentDirectoryPath];
         NSLog(@"\nCurrentpath is : \n%@", currentPath);

         //在当前目录下新建一个目录
         if ([fm createDirectoryAtPath:newDir withIntermediateDirectories:TRUE attributes:nil error:NULL] == NO) {
             NSLog(@"\nCouldn't creat the directory...");
             return ;
         }

         //更改路径名
         if ([fm moveItemAtPath: newDir toPath: @"changeDir" error:NULL] == NO) {
             NSLog(@"\nChange directory name failed");
             return ;
         }

         //更改当前路径
         if ([fm changeCurrentDirectoryPath:@"changeDir"] == NO) {
             NSLog(@"\nChange current directory failed");
             return ;
         }
         NSLog(@"\nAfter change current directory.....");
         currentPath = [fm currentDirectoryPath];
         NSLog(@"\nCurrentpath is : \n%@", currentPath);
     }
     return ;
 }