[英]nodesForXPath returning 0 objects
I have problems parsing elements from a XML String to an Array with TouchXML. 我在使用TouchXML将元素从XML字符串解析为数组时遇到问题。
I've succesfully made an CXMLDocument object with: 我成功使用以下方法制作了一个CXMLDocument对象:
CXMLDocument *doc =
[[CXMLDocument alloc] initWithXMLString:responseString options:0 error:&error];
I'm now trying to get all elements under "Vehicles" with: 我现在尝试使用以下方法将“车辆”下的所有元素:
NSArray *items = [[doc rootElement] nodesForXPath:@"//Vehicles" error:&error];
This returns 0 objects for the array. 这将为数组返回0个对象。 What am I doing wrong?
我究竟做错了什么?
The CXMLDocument output: 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>
I got it working, had to use namespaceMappings as following: 我得到它的工作,不得不使用namespaceMappings如下:
NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
@"http://howdoi.org/",
@"howdoi",
nil];
NSArray *items = [doc nodesForXPath:@"//howdoi:VehicleUnit" namespaceMappings:dict error:nil];
This sets the array to 11 items and let me do what i want :) 这将数组设置为11个项目,然后让我做我想做的事情:)
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