How set a website as homepage in IE, Firefox, Chrome and Safari with C++?

Is there a way to set a website like google.com as homepage throug开发者_开发百科h C++ or C ? How ?

Not sure what your motive is, but I don't think of this as something I want any code on my system to be setting out from under me. It sounds like the kind of thing adware/malware would do to your grandparents (who wouldn't know how to fix it once it's set). Note the negative comments when the question was asked of how to do it from JavaScript:

How can I set default homepage in FF and Chrome via javascript?

It's better to point people at instructions for doing it themselves. Remind with a banner which says "Make us your homepage!", and link to something along these lines:

http://www.makeuseof.com/tag/how-to-change-your-homepage-in-5-browsers/

If not for the aesthetic reasons, there are technical reasons not to try and write code for it. Each browser stores this information in its own place. In IE's case, there appears to be a registry setting:

HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\Start Page

So you'd use calls to the Windows Registry API to query it and set it. But Firefox doesn't save this in the registry, it saves it in something called prefs.js and you'll be looking for:

user_pref("browser.startup.homepage", .... );

Then there's Opera, Safari, Chrome, etc. All told, better to just give people directions and put them in control of their experience!

Imports Microsft.Win32
...

Module Util
    Sub SetHomePage(Dim theUrl As String)
        Registry.SetValue("HKCU\Software\Microsoft\Internet Explorer\Main", "Start Page", theUrl)
    End Sub
End Module

Yes.

Find the way each browser saves its configuration to disk and edit that (*). It may be a file, or records in a database, or some data in a central registry, or some other scheme --- the browser documentation should tell you.

^{To open/read/write/save/close a file, the C functions declared in the header <stdio.h> may be helpful.}

(*) for Firefox it's a file named "prefs.ini" in a directory somewhere under the users home path; there may be more than 1 such file if the user has more than 1 profile.