本文介绍了在ios中解析图像下载的多部分响应的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在我的应用程序中，我从服务器下载图像作为多部分内容.在我的响应数据中，我得到了 2 个部分:一个是 json 内容，另一个是下载的文件.响应格式如下.
In my application, I'm downloading image from server as multipart content. In my response data I'm getting 2 parts: one is json content and other is downloaded file. The response is in following format.
--poa89012-3212-1232-9201-fdsakjkj921
Content-Type: application/json; charset=utf-8
Content-Disposition: inline; name=info
{
//json content
}
--poa89012-3212-1232-9201-fdsakjkj921
Content-Disposition: file; name=file; filename=photo.png
Content-Type: application/octet-stream
// File data
˘íë77íí77Í¥2008:02:11 11:32:512008:02:1
------
当我尝试在 didReceiveResponse 中获取标头时，我无法处理这个包含 2 个部分的响应:它给出了整个响应的标头，其内容类型为多部分/混合.请告诉我如何通过拆分 json 内容和文件内容来处理此响应.
I'm not able to handle this response which has 2 parts, when I tried to get the headers in didReceiveResponse: it gives the headers for the entire response whose content-type is multipart/mixed.Please show me the way to handle this response by splitting the json content and the file content.
推荐答案
我也遇到了 http 的问题- 多部分响应.我为 NSData 写了一个类别.代码如下:
I also did have problems with http-multipart response. I wrote a category for NSData. Code below:
NSData+MultipartResponses.h
NSData+MultipartResponses.h
#import <Foundation/Foundation.h>
@interface NSData (MultipartResponses)
- (NSArray *)multipartArray;
- (NSDictionary *)multipartDictionary;
@end
NSData+MultipartResponses.m
NSData+MultipartResponses.m
#import "NSData+MultipartResponses.h"
@implementation NSData (MultipartResponses)
static NSMutableDictionary *parseHeaders(const char *headers)
{
NSMutableDictionary *dict=[NSMutableDictionary dictionary];
int max=strlen(headers);
int start=0;
int cursor=0;
while(cursor<max)
{
while((headers[cursor]!=':')&&(headers[cursor]!='='))
{
cursor++;
}
NSString *key=[[NSString alloc] initWithBytes:(headers+start) length:(cursor-start) encoding:NSASCIIStringEncoding];
cursor++;
while(headers[cursor]==' ')
{
cursor++;
}
start=cursor;
while(headers[cursor]&&(headers[cursor]!=';')&&((headers[cursor]!=13)||(headers[cursor+1]!=10)))
{
cursor++;
}
NSString *value;
if((headers[start]=='"')&&(headers[cursor-1]=='"'))
{
value=[[NSString alloc] initWithBytes:(headers+start+1) length:(cursor-start-2) encoding:NSASCIIStringEncoding];
}
else
{
value=[[NSString alloc] initWithBytes:(headers+start) length:(cursor-start) encoding:NSASCIIStringEncoding];
}
[dict setObject:value forKey:key];
if(headers[cursor]==';')
{
cursor++;
}
else
{
cursor+=2;
}
while(headers[cursor]==' ')
{
cursor++;
}
start=cursor;
}
return dict;
}
- (NSDictionary *)multipartDictionaryWithBoundary:(NSString *)boundary
{
NSMutableDictionary *dict=[NSMutableDictionary dictionary];
const char *bytes=(const char *)[self bytes];
const char *pattern=[boundary cStringUsingEncoding:NSUTF8StringEncoding];
int cursor=0;
int start=0;
int max=[self length];
int keyNo=0;
while(cursor<max)
{
if(bytes[cursor]==pattern[0])
{
int i;
int patternLength=strlen(pattern);
BOOL match=YES;
for(i=0; i<patternLength; i++)
{
if(bytes[cursor+i]!=pattern[i])
{
match=NO;
break;
}
}
if(match)
{
if(start!=0)
{
int startOfHeaders=start+2;
int cursor2=startOfHeaders;
while((bytes[cursor2]!=(char)0x0d)||(bytes[cursor2+1]!=(char)0x0a)||(bytes[cursor2+2]!=(char)0x0d)||(bytes[cursor2+3]!=(char)0x0a))
{
cursor2++;
if(cursor2+4==max)
{
break;
}
}
if(cursor2+4==max)
{
break;
}
else
{
int lengthOfHeaders=cursor2-startOfHeaders;
char *headers=(char *)malloc((lengthOfHeaders+1)*sizeof(char));
strncpy(headers, bytes+startOfHeaders, lengthOfHeaders);
headers[lengthOfHeaders]=0;
NSMutableDictionary *item=parseHeaders(headers);
int startOfData=cursor2+4;
int lengthOfData=cursor-startOfData-2;
if(([item valueForKey:@"Content-Type"]==nil)&&([item valueForKey:@"filename"]==nil))
{
NSString *string=[[NSString alloc] initWithBytes:(bytes+startOfData) length:lengthOfData encoding:NSUTF8StringEncoding];
keyNo++;
[dict setObject:string forKey:[NSString stringWithFormat:@"%d", keyNo]];
}
else
{
NSData *data=[NSData dataWithBytes:(bytes+startOfData) length:lengthOfData];
[item setObject:data forKey:@"data"];
keyNo++;
[dict setObject:item forKey:[NSString stringWithFormat:@"%d", keyNo]];
}
}
}
cursor=cursor+patternLength-1;
start=cursor+1;
}
}
cursor++;
}
return dict;
}
- (NSArray *)multipartArray
{
NSDictionary *dict=[self multipartDictionary];
NSArray *keys=[[dict allKeys] sortedArrayUsingSelector:@selector(localizedStandardCompare:)];
NSMutableArray *array=[NSMutableArray array];
for(NSString *key in keys)
{
[array addObject:dict[key]];
}
return array;
}
- (NSDictionary *)multipartDictionary
{
const char *bytes=(const char *)[self bytes];
int cursor=0;
int max=[self length];
while(cursor<max)
{
if(bytes[cursor]==0x0d)
{
break;
}
else
{
cursor++;
}
}
char *pattern=(char *)malloc((cursor+1)*sizeof(char));
strncpy(pattern, bytes, cursor);
pattern[cursor]=0x00;
NSString *boundary=[[NSString alloc] initWithCString:pattern encoding:NSUTF8StringEncoding];
free(pattern);
return [self multipartDictionaryWithBoundary:boundary];
}
@end
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