无法从NSDictionary中提取所需的信息 [英] Can't extract needed information from NSDictionary

问题描述

我解析一个XML文件，解析后得到一个NSDictionary对象(命名为XMLDictionary).我在解析这个:

I parse a XML file, and after parsing get a NSDictionary object (XMLDictionary named). I'm parsing this:

<result><node><id>27</id><name>Name 1</name><type>0</type><price>0</price><img>/upload/iblock/1a1/1a138b2d4da6e42398beeb21acc8e84f.png</img></node><node><id>28</id><name>Name 2</name><type>0</type><price>0</price><img>/upload/iblock/b72/b724d1550f93987a73b04974b5f7390e.png</img></node></result>

之后，我正在尝试使用此方法(titleArr-NSArray):

After that i'm trying this (titleArr - NSArray):

_titleArr = [[[[_xmlDictionary objectForKey:@"result"] objectForKey:@"node"] objectForKey:@"name"] valueForKey:@"text"];

在运行时，我在上面的行中收到此错误:线程1:信号SIGABRT".我该如何解决这个问题?

In Run-time I get this error in the above line: "Thread 1: signal SIGABRT". How can i fix this problem?

推荐答案

NSError* parseError = nil;
_xmlDictionary = [XMLReader dictionaryForXMLString:myXMLString error:&parseError];
if (parseError != nil) {
    NSLog(@"Error on XML parse: %@", parseError);
}

NSLog(@"The full dictionary is %@", _xmlDictionary);

NSDictionary* result = [_xmlDictionary objectForKey:@"result"];
NSLog(@"'result' = %@", result);
NSDictionary* node = [result objectForKey:@"node"];
NSLog(@"'node' = %@", node);
NSString* name = [node objectForKey:@"name"];
NSLog(@"'name' = %@", name);

至少，如果失败，该错误将被隔离到一个操作中.然后，NSLogs将在每个步骤之后为您显示这些值.

At the very least, if it fails, the error will be isolated to a single operation. And the NSLogs will show you the values after each step.

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