iOS 获取文件MIMEType的方式

// 获取MIMEType
//1. 发送请求,可以在响应头(内部有MIMEType)
//2. 百度 MIMEType
//3. 调用C语言API
//4. application/octet-stream 任意的二进制数据类型

// Created by 朝阳 on 2017/12/12.
// Copyright © 2017年 sunny. All rights reserved.
//

import "ViewController.h"

import

@interface ViewController ()

@end

@implementation ViewController

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
  {
  // 获取MIMEType
  //1. 发送请求,可以在响应头(内部有MIMEType)
  //2. 百度 MIMEType
  //3. 调用C语言API
  //4. application/octet-stream 任意的二进制数据类型

  // [self getMimeType];

  NSString *mimeType = [self mimeTypeForFileAtPath:@"/Users/sunny/Desktop/test.h"];
  NSLog(@"%@",mimeType);
  }

// 发送请求,在响应头中 有MIMEType属性

• (void)getMimeType
  {
  //1. url
  // NSURL *url = [NSURL URLWithString:@"http://120.25.226.186:32812/login"];
  NSURL *url = [NSURL fileURLWithPath:@"/Users/sunny/Desktop/test.h"];

  //2. 创建请求对象
  NSURLRequest *request = [NSURLRequest requestWithURL:url];
  //3. 发送异步请求
  [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {
  //4. 获得文件的类型
  NSLog(@"%@",response.MIMEType);
  }];

}

// 调用C语言API

• (NSString *)mimeTypeForFileAtPath:(NSString *)path
  {
  if (![[[NSFileManager alloc] init] fileExistsAtPath:path]) {
  return nil;
  }

  CFStringRef UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, (__bridge CFStringRef)[path pathExtension], NULL);
  CFStringRef MIMEType = UTTypeCopyPreferredTagWithClass (UTI, kUTTagClassMIMEType);
  CFRelease(UTI);
  if (!MIMEType) {
  return @"application/octet-stream";
  }
  return (__bridge NSString *)(MIMEType);
  }