html - Objective-C 中的 Hpple 找不到特定对象(XML/HTML 解析器)

Question

对于那些还没有尝试过 Hpple 的老手来说，它很棒。它使用 Xpath 搜索 HTML/XML 文档。它完成了工作，而且对于像我这样的新手来说也很容易理解。但是，我遇到了麻烦。

我有这段 HTML:

    <ul class="challengesList dailyChallengesList">

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl00_challengeImage" title="Gunslinger" src="/images/reachstats/challenges/0.png" alt="Gunslinger" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl00_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1500cR</p>
</div>
<h5>Gunslinger</h5>
<p class="description">Kill 150 enemies in multiplayer Matchmaking.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl00_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl00_progressBar" class="bar" style="width:21%;"><span></span></div> 
<p>31/150</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl01_challengeImage" title="A Great Friend" src="/images/reachstats/challenges/0.png" alt="A Great Friend" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl01_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1400cR</p>
</div>
<h5>A Great Friend</h5>
<p class="description">Earn 15 assists today in multiplayer Matchmaking.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl01_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl01_progressBar" class="bar" style="width:40%;"><span></span></div> 
<p>6/15</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl02_challengeImage" title="Cannon Fodder" src="/images/reachstats/challenges/2.png" alt="Cannon Fodder" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl02_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1000cR</p>
</div>
<h5>Cannon Fodder</h5>
<p class="description">Kill 50 infantry-class foes in the Campaign today.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl02_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl02_progressBar" class="bar" style="width:0%;"><span></span></div> 
<p>0/50</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

<li>
<div class="corner topLeft"></div>
<img id="ctl00_mainContent_dailyChallengesRepeater_ctl03_challengeImage" title="Heroic Demon" src="/images/reachstats/challenges/3.png" alt="Heroic Demon" style="border-width:0px;">
<div class="info">
<div class="rFloat">
<p id="ctl00_mainContent_dailyChallengesRepeater_ctl03_challengeExpiration" class="timeDisplay dailyExpirationCountdown"><span>0d</span><span>19h</span><span>9m</span><span class="seconds">37s</span></p>
<p>1500cR</p>
</div>
<h5>Heroic Demon</h5>
<p class="description">Kill 30 Elites in Firefight Matchmaking on Heroic or harder.</p>
<div class="reward">

<div id="ctl00_mainContent_dailyChallengesRepeater_ctl03_progressBox" class="barContainer">
<div id="ctl00_mainContent_dailyChallengesRepeater_ctl03_progressBar" class="bar" style="width:0%;"><span></span></div> 
<p>0/30</p>
</div>
</div>
</div>
<div class="clear"></div>
</li>

</ul>

疯狂的部分是，我无法让 Hpple“看到”<div class="reward"> .我正在使用以下方法找到它:

NSArray * rawProgress = [doc search:@"//ul[@class='challengesList']
                                          /li/div[@class='info']
                                                 /div[@class='reward']/p"];

这总是返回一个空数组。这让我抓狂，因为同样的事情适用于这个项目中的所有其他元素......

任何帮助将不胜感激:)

编辑

这个有效:

NSArray * rawDescriptions = [doc search:@"//ul[@class='challengesList']
                                              /li/div[@class='info']
                                                     /p[@class='description']"];

这不是:

NSArray * rawProgress = [doc search:@"//ul[@class='challengesList']
                                          /li/div[@class='info']
                                                 /div[@class='reward']
                                                     /div[@id]//p"];

此外，尝试列出 rFloat 或 reward 的子节点会产生崩溃:(

Answer 1

您的“p”元素不是 div class="reward"的直接子元素。

使用您提供的 XML，XPath 表达式

div[@class='info']/div[@class='reward']//p

会起作用。