oc学习之旅：文件操作

来源：互联网发布：淘宝订单回流工具编辑：程序博客网时间：2024/05/14 16:39

文件操作

#import <Foundation/Foundation.h>

#define PATH @"/Users/chanbin/Desktop/Class7Test"

#define PATH1 @"/Users/chanbin/Desktop/Class7Test/a0.txt"

#define PATH2 @"/Users/chanbin/Desktop/"

int main(int argc,constchar * argv[])

{

@autoreleasepool {

NSFileManager:文件管理器单例

作用：创建移动删除拷贝文件或文件夹，读取文件属性

//获取文件管理器

NSFileManager *manager =[NSFileManager defaultManager];

NSError * error =nil;

BOOL flag;

//文件是否存在

[manager fileExistsAtPath:PATH isDirectory:&flag];

if (flag)

NSLog(@"file exits!");

//否则创建一个文件夹

else

[manager createDirectoryAtPath:PATH withIntermediateDirectories:NO attributes:nil error:&error];

//删除文件夹

// [manager removeItemAtPath:PATH error:&error];

// if (error) {

// NSLog(@"error is %@",error);

// }

for(int i =0; i<10;i++)

{

NSString *filename = [NSString stringWithFormat:PATH@"/a%i.txt",i];

if(![manager fileExistsAtPath:filename])

[manager createFileAtPath:filenamecontents:[filenamedataUsingEncoding:NSUTF8StringEncoding]attributes:nil];

//contains：是否需要附加数据 attributes：是否程序要创建子目录

}

//读取文件大小

//将指定文件的属性读取到字典当中

NSDictionary *dic =[manager attributesOfItemAtPath:

[NSStringstringWithFormat:PATH@"/a%i.txt",0]error:nil];

//获取大小 NSMumber

NSLog(@"%@",[dicobjectForKey:NSFileSize]);

//浅度遍历 :目录下所有文件存储在数组中

NSArray *arr1 = [manager contentsOfDirectoryAtPath:PATH error:nil];

NSLog(@"arr1 is %@",arr1);

//深度遍历 :

NSArray *arr2 = [manager subpathsOfDirectoryAtPath:PATH error:nil];

NSLog(@"%@",arr2);

float count =0;

for (int i =0; i<arr2.count; i++) {

NSString * s = [NSString stringWithFormat:PATH@"/%@",arr2[i]];

if (([arr2[i] rangeOfString:@"."].length!=0)||([arr2[i] rangeOfString:@"Store"].length )!=0) {

NSDictionary *dic = [manager attributesOfItemAtPath:serror:nil];

count += [[dic objectForKey:NSFileSize]floatValue];

}

NSLog(@"%.1f",count);

NSLog(@"%li,%li",[@"aaa/a2.txt" rangeOfString:@"txt"].location,[@"aaa/a2.txt" rangeOfString:@"txt"].length

);

//拷贝文件源地址目标地址

if ([manager fileExistsAtPath:PATH1]) {

[manager copyItemAtPath:PATH1toPath:[NSStringstringWithFormat:@"%@_BAK",PATH1]error:&error];

if (error) {

NSLog(@"error %@",error);

}else{

NSLog(@"copy success!");

}

//拷贝目录

[manager moveItemAtPath:PATHtoPath:PATH2@"/Text"error:&error];

if (error) {

NSLog(@"error %@",error);

}

elseNSLog(@"move success");

//删除

[manager removeItemAtPath:PATH1error:&error];

if (error) {

NSLog(@"%@",error);

}

elseNSLog(@"remove success");

}

return0;

}

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