你如何将 QUrl addQueryItem 移植到 Qt5 的 QUrlQuery? [英] How do you port QUrl addQueryItem to Qt5's QUrlQuery?

问题描述

在Qt 4中，使用QUrl的以下代码有效:

In Qt 4, the following code using QUrl works:

QUrl u;
foreach (const settings::PostItem & pi, settings.post)
    u.addQueryItem(pi.name, pi.value);
postData = u.encodedQuery();

注意:此代码来自 wkhtmltopdf 和 postData 是一个 QByteArray.

NOTES: this code is from wkhtmltopdf and postData is a QByteArray.

然而，Qt 5 不再有 addQueryItem() 函数.你如何移植这个代码?

However, Qt 5 does not have the addQueryItem() function anymore. How do you port this code?

推荐答案

为了确保与 Qt 4 兼容，请在文件顶部添加以下几行:

In order to ensure compatibility with Qt 4, add the following lines at the top of your file:

#if QT_VERSION >= QT_VERSION_CHECK(5,0,0)
#   include <QUrlQuery>
#endif

这意味着如果您针对 Qt 5.0.0 或更高版本进行编译，QUrlQuery 只会被 #included.

This means that QUrlQuery will only be #included if you are compiling against Qt 5.0.0 or greater.

然后在问题中指定的代码上方添加以下行:

Then add the following line above the code specified in the question:

#if QT_VERSION < QT_VERSION_CHECK(5,0,0)

然后在问题中指定的代码下方插入此代码:

and then insert this code below the code specified in the question:

#else
    QUrlQuery q;
    foreach (const settings::PostItem & pi, settings.post)
        q.addQueryItem(pi.name, pi.value);
    postData = q.query(QUrl::FullyEncoded).toUtf8();
#endif

注意:使用 toUtf8() 是因为 postData 是 QByteArray 和 query() 返回一个 QString.toAscii() 在 Qt 5 中已被弃用，但 UTF-8 是 ASCII 的子集，仅在必要时使用 Unicode 字符.

NOTE: toUtf8() is used because postData is a QByteArray and query() returns a QString. toAscii() was deprecated in Qt 5, but UTF-8 is a subset of ASCII with Unicode characters only when necessary.

EDIT:如果您想使用具有 URL 部分的真实 QUrl，请添加:

EDIT: In the case you want to use a real QUrl that has a URL portion, add this:

 QUrl url;
 url.setQuery(q);

这篇关于你如何将 QUrl addQueryItem 移植到 Qt5 的 QUrlQuery?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！