Qt 打開指定網站/系統文件夾



本文轉載自：http://blog.csdn.net/robertkun/article/details/7802977和http://hi.baidu.com/xyhouse/item/ccfbe58634aac2eae496e0a6

一、QT打開指定網站和文件夾

在Qt程序中，如果要打開指定網站或系統中的文件夾，可以使用QDesktopServices類的openUrl方法。

詳見http://qt-project.org/doc/qt-5/qdesktopservices.html

比如要打開Qt開發社區，相應的代碼如下：

#include <QDesktopServices>
#include <QUrl>

QDesktopServices::openUrl(QUrl("http://qt-project.org/doc/qt-5/classes.html"));

要打開系統中的某個文件夾，如下：

QDesktopServices::openUrl(QUrl("file:///C:/Documents and Settings/All Users", QUrl::TolerantMode));

需要注意的是打開網址是http://，打開文件夾是file:///

在官網中關於QDesktopServices::openUrl的方法描述如下：

bool QDesktopServices::openUrl(constQUrl & url) [static]

Opens the given url in the appropriate Web browser for the user's desktop environment, and returnstrue if successful; otherwise returnsfalse.

If the URL is a reference to a local file (i.e., the URL scheme is "file") then it will be opened with a suitable application instead of a Web browser.

The following example opens a file on the Windows file system residing on a path that contains spaces:

QDesktopServices::openUrl(QUrl("file:///C:/Documents and Settings/All Users/Desktop", QUrl::TolerantMode));

二、Qt中QUrl::addQueryItem的Bug

在開發中，用到了如下語句：

QUrl url = QString("http://localhost/test")

url.addQueryItem("test", QString("abc+bcd"));

服務器一收，發現接收到的字符串變成了"abc bcd"。頓時鬱悶了。

查了半天，找不着原因，上論壇問，很久也沒人回答。

終於，有一位大牛解開了疑惑：

Qt should be encoding the literal '+' as %2B on your behalf. There is a bug that has been (I think incorrectly) closed as invalid:http://bugreports.qt.nokia.com/browse/QTBUG-10146

You can work around it with this:
Qt Code:Switch viewurl.addEncodedQueryItem("another",QUrl::toPercentEncoding("abc+bcd"));

最後，推薦一下Qt的這個論壇，牛人挺多的。

http://www.qtcentre.org/content/