我正在做一个小项目，这就是我要做的事情：
我使用Qt ui和webView小部件，我想从网页的源代码中提取特定信息。 这是组件的订购代码。 在这个例子中，我要提取的部分是1758990：
<div id="productDescription"> <div class="brandLogo"> <a href="http://uk.farnell.com/multicomp"> <img id="supplier_logo" src="http://uk.farnell.com/productimages/promo/en_GB/2217096.jpg" alt="MULTICOMP"/> </a> </div> <ul> <li> <strong>Manufacturer:</strong> <a href="http://uk.farnell.com/multicomp"> MULTICOMP </a> </li> <li> <strong>Order Code:</strong> 1758990 </li> <li> <strong>Manufacturer Part No</strong> MC0402B821K500CT </li> </ul> <ul id="technicalData"> <li> <a href="http://www.farnell.com/datasheets/1859359.pdf" target="_blank" ><span class="pfIcon pfPdf" title="Technical Data Sheet (877.82KB) EN"> </span>Technical Data Sheet (877.82KB) EN</a> </li> </ul> </div>我想使用这个订单代码并将其放在一个变量中。 其余的我会管理，但我找不到正确的工具来找到代码（这是永远不会相同）。 我设法使用toHtml（）函数从页面中提取整个源代码，并尝试将其导出到textEdit但我真的不知道它可能有什么用处。 我该怎么用？
先谢谢你。
（对不起，我很擅长提问，所以请原谅我，如果我提出写作惯例）
编辑：我正在尝试使用findFirstElement（）函数，但我找不到正确的查询只提取1758990.我可以使用findFirstElement提取“订单代码：1758990”（“＃productDescription li：nth-child（2） “）但我只想要订单代码：。（
I'm doing a little project and here's what I'm trying to do :
I use the Qt ui with a webView widget and I would like to extract a specific information from the source code of a web page. It's the Order Code of a component. The part I would like to extract is 1758990 in this example:
<div id="productDescription"> <div class="brandLogo"> <a href="http://uk.farnell.com/multicomp"> <img id="supplier_logo" src="http://uk.farnell.com/productimages/promo/en_GB/2217096.jpg" alt="MULTICOMP"/> </a> </div> <ul> <li> <strong>Manufacturer:</strong> <a href="http://uk.farnell.com/multicomp"> MULTICOMP </a> </li> <li> <strong>Order Code:</strong> 1758990 </li> <li> <strong>Manufacturer Part No</strong> MC0402B821K500CT </li> </ul> <ul id="technicalData"> <li> <a href="http://www.farnell.com/datasheets/1859359.pdf" target="_blank" ><span class="pfIcon pfPdf" title="Technical Data Sheet (877.82KB) EN"> </span>Technical Data Sheet (877.82KB) EN</a> </li> </ul> </div>I would like to use this order code and put it in a variable. The rest I would manage but I can't find the correct tools to find the code (which is never the same). I managed to extract the entire source code from the page with a toHtml() function and tried to export it to a textEdit but I don't really know what use it could have. What should I use ?
Thank you in advance.
(also I'm sorry, I'm quite new at asking questions so forgive me if I f.. up the writing conventions)
EDIT: I'm trying to use the findFirstElement() function but I can't find the correct query to extract only 1758990. I can extract "Order Code: 1758990" with findFirstElement("#productDescription li:nth-child(2)") but I only want the order Code :.(
最满意答案
好吧，我找到了一种方法（当然不是最干净的但是......）
我有一个按钮来检索代码：
void browser::on_Addtodbbtn_clicked() { QWebElement code = ui->webView->page()->mainFrame()->findFirstElement("#productDescription li:nth-child(2)"); QString OrderCode = code.toPlainText(); // at this point, OrderCode = "Order Code: 1758990" OrderCode.remove("Order Code: "); // I remove the part I don't want qDebug() << "OrderCode:" << OrderCode; // Here you go }这页帮助了我很多： http ： //www.w3schools.com/cssref/css_selectors.asp
Okay I found a way (surely not the cleanest one but well...)
I have a button to retrieve the code :
void browser::on_Addtodbbtn_clicked() { QWebElement code = ui->webView->page()->mainFrame()->findFirstElement("#productDescription li:nth-child(2)"); QString OrderCode = code.toPlainText(); // at this point, OrderCode = "Order Code: 1758990" OrderCode.remove("Order Code: "); // I remove the part I don't want qDebug() << "OrderCode:" << OrderCode; // Here you go }this page helped me a lot: http://www.w3schools.com/cssref/css_selectors.asp
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