Link

Hi, im new to C++ and I was would like to know how to make a link in it. What do I need to add to the click event Thanks, jrcdude.

Visual Studio Express Editions30

well depends on what the link format is. if you want to launch a site for example:

System.Diagnostics.Process.Start("link")

or you can use the ProcessStartInfo class, gives you more options:

Dim thePS as new System.Diagnostics.ProcessStartInfo("iexplore.exe")

thePS.Arguments = "link"

System.Diagnostics.Process.Start(thePS)

typically you would implement the LinkClicked event and then do this:

Dim theTarget as string = CType(e.link.LinkData, string)

if theTarget is nothing = false then

System.Diagnostics.Process.Start(theTarget)

end if

does this help is this what you are after

I'm not sure what you mean by a "link". Could you explain in more detail what you are attempting to do

Ok, I want to have a button or link label that when clicked, opens a url in your default browser.

Hi Goat Spirit, ahmedilyas' solution will work; unfortunately it suffers from a couple of issues.

One, it only uses IE and ignores the user's default browser setting. And two, it causes your UI to block until the browser is properly loaded--which could take several seconds, leaving your UI unresponsive and unable to paint correctly if you switch to another application and back (or another application pops-up). A pattern I use is to use a BackgroundWorker object to use a background thread to spawn the browser. To make it more complex, Process.Start doesn't support executing the URL as a command (see http://msdn.microsoft.com/msdnmag/issues/05/03/CATWork/ for the gory details) and you have to enlist the help of URL.DLL and it's FileProtocolHandler entry. The following is the pattern:

       '...
       Me.spawnBrowserBackgroundWorker = New BackgroundWorker
       AddHandler Me.spawnBrowserBackgroundWorker.DoWork, New DoWorkEventHandler(AddressOf Me.spawnBrowserBackgroundWorker_DoWork)
       '...
 
    Private Sub spawnBrowserBackgroundWorker_DoWork(ByVal sender As Object, ByVal e As DoWorkEventArgs)
       Dim url As String = TryCast(e.Argument, String)
       If (Not url Is Nothing) Then
           Dim process As New Process
           process.StartInfo.FileName = "rundll32.exe"
           process.StartInfo.Arguments = ("url.dll,FileProtocolHandler " & url)
           process.StartInfo.UseShellExecute = True
           process.Start()
       End If
    End Sub
 
    Private Sub linkLabel1_LinkClicked(ByVal sender As Object, ByVal e As LinkLabelLinkClickedEventArgs)
       Me.spawnBrowserBackgroundWorker.RunWorkerAsync(linkLabel1.Text)
    End Sub

It manually creates the BackgroundWorker object and hooks up the DoWork event handler for clarity.

If you are using winforms, you can make use of the HttpResponse.Redirect method. Take a look at http://msdn.microsoft.com/library/default.asp url=/library/en-us/cpref/html/frlrfsystemwebhttpresponseclassredirecttopic.asp for more details.

Thanks,

Ayman Shoukry

VC++ Team

Thanks Peter - you learn new things everyday :-)

I tried this, but got some errors:
AddHandler - Syntax Error.
Me.spawnBrowserBackgroundWorker - Syntax Error.
If (Not url Is Nothing) Then - Variable 'url' has been used before being assigned a value. A null exception could occur at runtime.

Not sure if I declared everything right, try it to see if it works.

I mean like in visual basic, you use the Process.Start("http://www.microsoft.com/") in the click event, i need to know the code like that.

You can use the same method in VC++. Take a look at http://msdn.microsoft.com/library/default.asp url=/library/en-us/cpref/html/frlrfsystemdiagnosticsprocessclassstarttopic.asp

Thanks,

Ayman Shoukry

VC++ Team

Public Class Form1

Private Sub spawnBrowserBackgroundWorker_DoWork(ByVal sender As Object, ByVal e As System.ComponentModel.DoWorkEventArgs)

Dim url As String = TryCast(e.Argument, String)

If (Not url Is Nothing) Then

Dim process As New Process

process.StartInfo.FileName = "rundll32.exe"

process.StartInfo.Arguments = ("url.dll,FileProtocolHandler " & url)

process.StartInfo.UseShellExecute = True

process.Start()

End If

End Sub

Dim spawnBrowserBackgroundWorker As New System.ComponentModel.BackgroundWorker

Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

AddHandler spawnBrowserBackgroundWorker.DoWork, AddressOf Me.spawnBrowserBackgroundWorker_DoWork

End Sub

Private Sub LinkLabel1_LinkClicked_1(ByVal sender As System.Object, ByVal e As System.Windows.Forms.LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked

spawnBrowserBackgroundWorker.RunWorkerAsync(LinkLabel1.Text)

End Sub

End Class

It's getting closer but I still cant get it to work right.

Can you take a look at my click event and tell me if you see something wrong Thanks, jrcdude.

This is just supposed to open Internet Explorer.

}

#pragma endregion

private: System::Void linkLabel1_LinkClicked(System::Object^ sender, System::Windows::Forms::LinkLabelLinkClickedEventArgs^ e)

{

Process::Start(S"C:\Program Files\Internet Explorer\iexplore.exe");

}

The "S" string prefix only works with the old MC++ syntax. Try this:
System::Diagnostics::Process::Start("C:\\Program Files\\Internet Explorer\\iexplore.exe");

Nope still doesn't work. I click the link and nothing happens. I also tryed it with a link and still didn't work. Any suggestions Thanks, jrcdude.

Set a breakpoint on the line of code. Start the debug and click the link. If it breaks, you have some kind of problem with Internet Explorer. If it doesn't, you have some kind of problem with the link event handler.

Could you please give me a sample project Just a 1 form application with a link that works I would like to see if I'm doing something wrong. Thanks, jrcdude.

Ok, nevermind I finally got it to work. Thanks for all your help.