detect if a URL exists or not

[timmu]

Hello!

Is it possible to use Qt to detect if a website exists or not without opening it in a browser window with:

QDesktopServices::openUrl(myUrl);

QDesktopServices::openUrl(myUrl);

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If you have to open a website as shown above in order to test it, how do you then test it if it exists (opens properly) or not?

Thanks!

[aamer4yu]

QUrl::isValid

Psst.. : Search Qt Assistant too... it will answer many questions, just needs a little searching

[timmu]

Aamer4yu, thanks much for your answer!

The problem that I see with "url.isValid()" is that it only seems to detect whether the URL syntax is valid. I' like to detect if the webiste exists. I use IE and when I open a website that doesn't exist (for example http://www.wolf222.com) the browser opens a window where it says that the website doesn't exist and isValid() doesn't think anything is wrong.

Is it possible to detect if a webiste exists?

Is the only way to do it to open the HTML file of the error message and read it and try to detect if it is a standard error message? If that is the case, how do you open an HTML from the internet so that you could read it like a normal file? I use Qt 4.4.

Thanks again!

[aamer4yu]

Doesnt QDesktopServices::openUrl return bool ? If it returns false, it means the url was not found.

Also you can have a look at QNetworkReply. It as one network error - QNetworkReply::HostNotFoundError . I havent worked with web related stuff, so can only hint you. You will need to dig deeper

[momchil]

No, QDesktopServices's openUrl() does not return "false" if the web address is not found... ???

[anda_skoa]

Have a look at QNetworkAccessManager::get()

I.e. do a HTTP get call on the URL. if this succeeds then opening in a browser should succeed as well.

Cheers,
_