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(@"
The 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(@"
The 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(@"
 Can't copy the file");
            return 1;
        }
        //检测两个文件内容是否相同
        if ([fm contentsEqualAtPath: fname andPath: @"newFile"] == NO) {
            NSLog(@"
The contents is not same");
            return 2;
        }
        //移动或者改名文件
        if ([fm moveItemAtPath: @"newFile"  toPath: @"myFile2" error:NULL] == NO) {
            NSLog(@"
Can't change the name");
            return 3;
        }
        //获取文件数据字典
        if ((attr = [fm attributesOfItemAtPath: fname error:NULL]) == nil) {
            NSLog(@"
Get attributets failed");
            return 4;
        }
        //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(@"
 Show the file contents");
        NSLog(@"
%@", [NSString stringWithContentsOfFile: fname encoding:NSUTF8StringEncoding error:NULL]);
    }
    return 0;
}

 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 0;
        }
        
        //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 1;
        }
        
        //读出文件内容
        NSLog(@"
%@", [NSString stringWithContentsOfFile:@"myFavoriteFile" encoding: NSUTF8StringEncoding error:NULL]);
    }
    return 0;
}

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(@"
Currentpath is : 
%@", 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(@"
Couldn't creat the directory...");
            return 0;
        }
        
        //更改路径名
        if ([fm moveItemAtPath: newDir toPath: @"changeDir" error:NULL] == NO) {
            NSLog(@"
Change directory name failed");
            return 2;
        }
        
        //更改当前路径
        if ([fm changeCurrentDirectoryPath:@"changeDir"] == NO) {
            NSLog(@"
Change current directory failed");
            return 1;
        }
        NSLog(@"
After change current directory.....");
        currentPath = [fm currentDirectoryPath];
        NSLog(@"
Currentpath is : 
%@", currentPath);
    }
    return 0;
}