nodesForXPath返回0个对象

我在使用TouchXML解析XML String中的元素到Array时出现问题。nodesForXPath返回0个对象

我已经成功地做了CXMLDocument对象有：

CXMLDocument *doc = 
[[CXMLDocument alloc] initWithXMLString:responseString options:0 error:&error];

现在我要去跟在“汽车”的所有元素：

NSArray *items = [[doc rootElement] nodesForXPath:@"//Vehicles" error:&error];

这将返回数组0对象。我究竟做错了什么？

的CXMLDocument输出：

<CXMLDocument 0x21043480 [0x24a64650]> <?xml version="1.0" encoding="utf-8"?> 
<System xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://howdoi.org/"> 
    <Vehicles> 
    <VehicleUnit> 
     <Plate>2353  </Plate> 
     <LastGPStime>2013-07-06 13:02</LastGPStime> 
     <LastLatitude>60.35405</LastLatitude> 
     <LastLongitude>5.36675</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>177</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2355  </Plate> 
     <LastGPStime>2013-07-06 13:02</LastGPStime> 
     <LastLatitude>60.35571</LastLatitude> 
     <LastLongitude>5.36802</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>84.9</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2356  </Plate> 
     <LastGPStime>2013-07-06 13:03</LastGPStime> 
     <LastLatitude>60.2893</LastLatitude> 
     <LastLongitude>5.22843</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>224.4</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2357  </Plate> 
     <LastGPStime>2013-07-06 13:03</LastGPStime> 
     <LastLatitude>60.39097</LastLatitude> 
     <LastLongitude>5.32535</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>27.4</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2358  </Plate> 
     <LastGPStime>2013-07-06 13:03</LastGPStime> 
     <LastLatitude>60.39585</LastLatitude> 
     <LastLongitude>5.3254</LastLongitude> 
     <LastSpeed>16.56</LastSpeed> 
     <LastCourse>141.5</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2359  </Plate> 
     <LastGPStime>2013-07-06 13:02</LastGPStime> 
     <LastLatitude>60.39801</LastLatitude> 
     <LastLongitude>5.32231</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>12.8</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2360  </Plate> 
     <LastGPStime>2013-07-06 13:02</LastGPStime> 
     <LastLatitude>60.35562</LastLatitude> 
     <LastLongitude>5.36813</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>65.8</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2361  </Plate> 
     <LastGPStime>2013-07-06 13:02</LastGPStime> 
     <LastLatitude>60.39897</LastLatitude> 
     <LastLongitude>5.32094</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>9.5</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2362  </Plate> 
     <LastGPStime>2013-07-06 13:03</LastGPStime> 
     <LastLatitude>60.28878</LastLatitude> 
     <LastLongitude>5.22882</LastLongitude> 
     <LastSpeed>22.68</LastSpeed> 
     <LastCourse>106.6</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2363  </Plate> 
     <LastGPStime>2013-07-06 13:03</LastGPStime> 
     <LastLatitude>60.34393</LastLatitude> 
     <LastLongitude>5.33881</LastLongitude> 
     <LastSpeed>78.84</LastSpeed> 
     <LastCourse>169.4</LastCourse> 
    </VehicleUnit> 
    <VehicleUnit> 
     <Plate>2364  </Plate> 
     <LastGPStime>2013-07-06 13:03</LastGPStime> 
     <LastLatitude>60.28939</LastLatitude> 
     <LastLongitude>5.2284</LastLongitude> 
     <LastSpeed>0</LastSpeed> 
     <LastCourse>234.3</LastCourse> 
    </VehicleUnit> 
    </Vehicles> 
</System>

来源

2013-07-06 Madoc

我懂了工作，不得不用namespaceMappings如下：

NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys: 
           @"http://howdoi.org/", 
           @"howdoi", 
           nil]; 
NSArray *items = [doc nodesForXPath:@"//howdoi:VehicleUnit" namespaceMappings:dict error:nil];

该阵列设置为11个项目，让我做我想做:)

来源

2013-07-07 11:47:25 Madoc

在您的节点中索引路径。车辆和车辆单位。两者都不一样？ –

nodesForXPath返回0个对象

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