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Using HtmlHelp() function launches a window on the wrong monitor.

Posted on 2008-10-27
2
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Last Modified: 2013-12-14
When I use the HtmlHelp() function in the Windows API to display my .chm file, the help window appears on a different monitor.  I have my application running on the right-hand monitor, and the help window appears on the left monitor.

How can I control where the window appears?

I am using HH_DISPLAY_TOPIC.

Thanks.
HWND hwnd = ::HtmlHelp( wnd, url, HH_DISPLAY_TOPIC, NULL ) ;

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Question by:Blivrail
2 Comments
 
LVL 3

Accepted Solution

by:
Norbert earned 250 total points
ID: 22819805
The HtmlHelp function delivers the window Handle of the Help Window.
Yo can use the MoveWindow Function to move the window where ever you want.

RECT r;
GetWindowRect(wnd,&r);
 
HWND hwnd = ::HtmlHelp( wnd, url, HH_DISPLAY_TOPIC, NULL ) ;
if(hwnd!=NULL)
{
    //overlaps the window wnd with the help window
    MoveWindow(hwnd,r.left,r.top,r.right-r.left,r.bottom-r.top,TRUE);
}

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Author Comment

by:Blivrail
ID: 22823922
I tried your method and it worked beautifully, although I wouldn't think that resizing the help window to be the same as the calling window would be nice.

I changed it so that it would center over the existing window instead.
RECT r;
GetWindowRect(wnd,&r);
 
HWND hwnd = ::HtmlHelp( wnd, url, HH_DISPLAY_TOPIC, NULL ) ;
 
if ( hwnd )
{
    RECT r2 ;
    GetWindowRect( hwnd, &r2 ) ;
 
    // Center the help window (r2) based on the parent window (r).
    LONG rHCenter = ( r.right + r.left ) / 2 ;
    LONG rVCenter = ( r.top + r.bottom ) / 2 ;
    LONG r2HalfWidth = ( r2.right - r2.left ) / 2 ;
    LONG r2HalfHeight = ( r2.bottom - r2.top ) / 2 ;
    MoveWindow( hwnd,
                rHCenter - r2HalfWidth,
                rVCenter - r2HalfHeight,
                r2.right - r2.left,
                r2.bottom - r2.top,
                TRUE
              ) ;
}

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