[C#, Toolbar] Problem with getting ToolBarButton

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Hello, I am here today to see you about a problem that I can't solve since many days...
I created a toolbar integrated into the Windows taskbar (like windows media player).
You will find an example here: http://goo.gl/PThTD
The problem is that the toolbar should be able to communicate with another application. I then realized that I needed to use the "Windows Messaging".
I found one that normally allows me to retrieve the bar buttons (TB_GETBUTTON).
Now I can not use it.
I found a tutorial on the internet, which gives an example of use:

C++

TBBUTTON tbButton;
TBBUTTON* ipRemoteBuffer = & tbButton; // unsafe
 
for ( int i = 0 ; i < count ; i++ )
{
    User32.SendMessage(
        hToolbar,
        TB_GETBUTTON,
        ( IntPtr ) i,
        ipRemoteBuffer );
}

Now in use, you get an error because the compiler no longer allows the use of this implementation ...
I can not find what to put in the last parameter of this function to retrieve the button.

C++

User32.SendMessage (
         toolbar,
         TB_GETBUTTON,
         IndexButton
         (IntPtr) variable);

My buttons are of the "ToolBarButton" my bar and type "ToolBar".
If you have any ideas or advice or anything, I'm interested.
Thank you in advance
-
Mat29100

Posted 9-May-11 0:18am

mat29100

Updated 9-May-11 0:54am

Sandeep Mewara

v2

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mat29100 · Answer 1 · 2011-05-09T21:25:00

Solution 2

Ok, thanks you. I'll try with your solution.
But i have an other question. What is the diference between the types 'TBBUTTON' and 'ToolBarButton' ?

Posted 9-May-11 21:25pm

mat29100

Comments

strogg 10-May-11 16:16pm

TBBUTTON is a structure defined in the Windows API. ToolBarButton is a class in the .Net Framework. They're totally different. Since you are interoping with the API (by calling SendMessage), you'll have to define the TBBUTTON structure in C#

strogg · Answer 2 · 2011-05-09T08:58:00

The last parameter should be a pointer to a TBBUTTON structure.
And the message you send retrieves the toolbar button's details through that structure.
Eg

TBBUTTON tbBtn = new TBBUTTON();
SendMessage(hToolbar, TB_GETBUTTON, i,
  tbBtn);

The TBBUTTON structure holds some info like it's state/style etc.
Check the msdn for more details on the structure & usage.

Your interop definition for the function would be

C#

[DllImport("user32.dll", CharSet=CharSet.Auto)]
public static extern int SendMessage(IntPtr hWnd, int msg, int wParam, out TBBUTTON tbBtn);

(you'll have to define the TBBUTTON structure as well)