OC10_文件练习

//

//  TextHander.h

//  OC10_文件练习

//

//  Created by zhangxueming on 15/6/19.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>



@interface TextHander : NSObject





+ (void)replaceStringInTextFile:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString;



+ (void)replaceStringInDirectory:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString fileType:(NSString *)type;







@end

//

//  TextHander.m

//  OC10_文件练习

//

//  Created by zhangxueming on 15/6/19.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import "TextHander.h"



@implementation TextHander



+ (void)replaceStringInTextFile:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString

{

    //备份文件 /name  /name_bak

    NSFileManager *fm = [NSFileManager defaultManager];

    [fm copyItemAtPath:path toPath:[path stringByAppendingString:@"_bak"] error:nil];

    //1.创建文件句柄

    NSFileHandle *fh = [NSFileHandle fileHandleForUpdatingAtPath:path];

    

    //2.读取文件

    NSData *data = [fh readDataToEndOfFile];

    NSString *dataString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];

    //3.替换内容

    dataString = [dataString stringByReplacingOccurrencesOfString:dstString withString:newString];

    //4.文件清空

    [fh truncateFileAtOffset:0];

    //5.写文件

    [fh writeData:[dataString dataUsingEncoding:NSUTF8StringEncoding]];

    //6.同步文件

    [fh synchronizeFile];

    //7.关闭文件

    [fh closeFile];

}



+ (void)replaceStringInDirectory:(NSString *)path withOldString:(NSString *)dstString toNewString:(NSString *)newString fileType:(NSString *)type

{

    //1.遍历目录

    NSFileManager *fm = [NSFileManager defaultManager];

    NSArray *contents = [fm subpathsOfDirectoryAtPath:path error:nil];

    // /dic/filename.txt

    //2.遍历数组 找到指定类型的文件

    for (NSString *item in contents) {

        NSString *name = [item pathExtension];

        if ([name isEqualToString:type]) {

            [self replaceStringInTextFile:[path stringByAppendingFormat:@"/%@",item] withOldString:dstString toNewString:newString];

        }

    }

}







@end

//

//  main.m

//  OC10_文件练习

//

//  Created by zhangxueming on 15/6/19.

//  Copyright (c) 2015年 zhangxueming. All rights reserved.

//



#import <Foundation/Foundation.h>

#import "TextHander.h"



//把path指定的文件中的字符串 "him" 替换为 "me”



//[LZXTextHandle replaceStringInTextFile:FILE_PATH withOldString:@"him" toNewString:@"me"];

//以下代码的作用:

//把path指定的文件夹中的txt文件中的字符串"him"替换为字符串"me"



//[LZXTextHandle replaceStringInDirectory:DIR_PATH withOldString:@"him" toNewString:@"me" fileType:@"txt"];

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

    @autoreleasepool {

        // insert code here...

        //NSLog(@"Hello, World!");

        //[TextHander replaceStringInTextFile:@"/Users/zhangxueming/Desktop/Test/3.txt" withOldString:@"him" toNewString:@"me"];

        [TextHander replaceStringInDirectory:@"/Users/zhangxueming/Desktop/Test" withOldString:@"him" toNewString:@"me" fileType:@"txt"];

        

    }

    return 0;

}