// // main.m // OC8_NSData // // Created by zhangxueming on 15/6/19. // Copyright (c) 2015年 zhangxueming. All rights reserved. // #import <Foundation/Foundation.h> int main(int argc, const char * argv[]) { @autoreleasepool { NSString *string = @"i love ios"; //把字符串对象转换成NSData对象 NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding]; NSLog(@"data = %@", data); //把NSData类对象转换成字符串对象 NSString *str = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding]; NSLog(@"str = %@", str); //把data对象数据写到指定文件中,文件不存在,则创建指定文件 //- (BOOL)writeToFile:(NSString *)path atomically:(BOOL)useAuxiliaryFile; BOOL ret = [data writeToFile:@"/Users/zhangxueming/Desktop/Test/data.txt" atomically:YES]; NSLog(@"ret = %i", ret); //把文件内容读成二进制对象 NSData *data1 = [NSData dataWithContentsOfFile:@"/Users/zhangxueming/Desktop/Test/data.txt"]; NSLog(@"data1 = %@", data1); } return 0; }
时间: 2024-10-13 03:19:30