Create child window

[kannan]

Hi,

  I want to create a child window for my plugin... I have used following cod snippet in windows attached event... but I am not able to create it... Please suggest the correct way to do it...

 
    HWND messageWin = CreateWindowEx(
       WS_EX_WINDOWEDGE,
        L"FB",
        L"FB",
        WS_BORDER | WS_VSCROLL,
        0, 0, 100, 100,
       g_hWnd, NULL, NULL, NULL);


Thanks
Kannan

[John Tan]

The 2nd parameter in CreateWindowEx is a Windows Class name which you must also create by calling the Win32 RegisterClass. The name you set in the WNDCLASS's lpszClassName will be the same name you set in the CreateWindowEx's 2nd parameter....

[kannan Gandhi]

Hi,
Thanks for your quick reply....
 Creating child window for my plugin, I have follow these steps

 1.create WNDCLASSEX structure
 2.Register class
 3.Create child window using "CreateWindowEx"

 This is the code snippet for creating WNDCLASSEX structure


WNDCLASSEX wcx;
    wcx.cbClsExtra = 0;
    wcx.cbSize = sizeof( WNDCLASSEX );  // 1.  NEW!  must know its own size.
    wcx.cbWndExtra = 0;
    wcx.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
    wcx.hCursor = LoadCursor( NULL, IDC_ARROW );        
    wcx.hIcon = LoadIcon( NULL, IDI_APPLICATION );    
    wcx.hIconSm = NULL;                 // 2.  NEW!!  Can specify small icon.
    wcx.hInstance = hInstance;        
    wcx.lpfnWndProc = WndProc;        
    wcx.lpszClassName = TEXT("Philip");
    wcx.lpszMenuName = 0;
    wcx.style = CS_HREDRAW | CS_VREDRAW;

How can I create "WndProc" for wcx.lpfnWndProc in attached event.

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[John Tan]

You can see the entire example here:

 

http://msdn.microsoft.com/en-us/library/vstudio/bb384843.aspx

[kannan Gandhi]

Ok john... I will go through it... and let you know

Thanks

Kannan

[Richard Bateman]

Could you be abit more specific about what "not able to create it" means? What happens? Did you call GetLastError and such to get the error reported?

Richard

[kannan Gandhi]

yes I called GetLastError and I got value as "1407"

Thanks

Kannan

[Neil Griffiths]

Did you register a class called "FB" with your own message handling procedure?

[kannan Gandhi]

HI,

 

  WNDCLASSEX wcx;
    wcx.cbClsExtra = 0;
    wcx.cbSize = sizeof( WNDCLASSEX );  // 1.  NEW!  must know its own size.
    wcx.cbWndExtra = 0;
    wcx.hbrBackground = (HBRUSH)GetStockObject( WHITE_BRUSH );
    wcx.hCursor = LoadCursor( NULL, IDC_ARROW );        
    wcx.hIcon = LoadIcon( NULL, IDI_APPLICATION );    
    wcx.hIconSm = NULL;                 // 2.  NEW!!  Can specify small icon.

    wcx.hInstance = hInstance;        
    wcx.lpfnWndProc = WndProc;    
   

    wcx.lpszClassName = TEXT("kannan");

    wcx.lpszMenuName = 0;
    wcx.style = CS_HREDRAW | CS_VREDRAW;

My question is how can I get hInstance and WndProc  In firebreath

Thanks

Kannan

[Neil Griffiths]

So your classname is "kanna" but you were trying to use "FB" in CreateWindow()?

You really SHOULD provide your own WndProc for your own child window. Your problem is getting the instance. You can do that via GetWindowInfo (http://msdn.microsoft.com/en-us/library/windows/desktop/ms633516(v=vs.85).aspx).

Good luck!

[kannan Gandhi]

How can I create WndProc for my plugin

Thanks
Kannan

[Neil Griffiths]

...write it? It's just a function.

This link was sent out this morning: http://msdn.microsoft.com/en-us/library/vstudio/bb384843.aspx

Read it, learn it, it'll help with most of your current problems. :)

[kannan Gandhi]

actually I am very new to  C++ and Firebreath  so that only I have many doubts neil....

[Neil Griffiths]

This isn't anything to do with C++ or FireBreath though, this is pretty basic Windows programming. And, unfortunately, you're making it harder for yourself by creating a child window. I don't know your reasons for doing that, all I can try to do is to help you by pointing you at the best resources that I know of.

Everybody was a beginner once, I haven't forgotten that. :)

[John Tan]

From my experience, it's more stable to create a child window and do everything on the child window if you constantly draw something on the surface. Drawing on the fb window directly could crash when the browser maximize/restore. Perhaps its a bug on my thread synchonization part but adding a child window solvd it...

[Neil Griffiths]

Oh, I render 3D games in my plugin so I didn't really have a choice but to create a child window.

But nobody would argue that it's _easier_ to do so. Especially if you're not used to Windows programming. It's confusing at first! :)

On Mon, Apr 22, 2013 at 5:25 PM, John Tan <tjk...@gmail.com> wrote:

From my experience, it's more stable to create a child window and do everything on the child window if you constantly draw something on the surface. Drawing on the fb window directly could crash when the browser maximize/restore. Perhaps its a bug on my thread synchonization part but adding a child window solvd it...

[kannan Gandhi]

Finally I did it.... Thanks neil and john for your valuable suggestions...

[Armin]

Hi kannan!

I have a similar Problem with my Plugin Window. I am able to register the class but I am not able to create a window. Would you mind sending me your working code for registering the class and creating the window?

Thanks,

Armin

[kannan Gandhi]

Hi Armin,

 Go through the below code....

BOOL CWindow::createImgWin(){
    DWORD err;
    //1. Get instance of parent window.
    HINSTANCE hInstance = (HINSTANCE)GetWindowLong(m_hParentWnd, GWL_HINSTANCE);

    //2. Create window class style for acsys image window.
    WNDCLASSEX wcImg;
    ATOM clsAtom(NULL);
    std::wstring winName = L"ImageWindow";
    std::wstring className = L"ImageWindowClass";

    if (!clsAtom) {
        //3. structuring the Window Class
        wcImg.cbSize        = sizeof(WNDCLASSEX);
        wcImg.style         = CS_DBLCLKS | CS_NOCLOSE | CS_VREDRAW | CS_HREDRAW | CS_DROPSHADOW | CS_NOCLOSE;
        wcImg.lpfnWndProc   = &CWindow::acsysWinProc;
        wcImg.cbClsExtra    = 0;
            wcImg.cbWndExtra    = 0;
        wcImg.hInstance     = hInstance;
        wcImg.lpszMenuName  = NULL;
        wcImg.lpszClassName = className.c_str();
        wcImg.hIcon = NULL;
        wcImg.hCursor = NULL;
            wcImg.hIconSm = NULL;
            wcImg.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);

        //4. Registering Class
        if (!(clsAtom = ::RegisterClassEx(&wcImg))) {
            err = GetLastError();
            if (err != ERROR_CLASS_ALREADY_EXISTS) {
                throw std::runtime_error("Could not register window class");
            }
        }
    }

    //4. Create image window class
    g_hChildWin = CreateWindowEx(
        WS_EX_WINDOWEDGE | WS_EX_NOPARENTNOTIFY,        //Extended Window Styles - WS_EX_TOOLWINDOW, WS_OVERLAPPEDWINDOW, WS_OVERLAPPED, WS_EX_STATICEDGE
        className.c_str(),                                //window class name
        winName.c_str(),                                //window caption
        WS_CHILDWINDOW | WS_VISIBLE |
        WS_BORDER | WS_VSCROLL | WS_HSCROLL,            //window style WS_VSCROLL WS_HSCROLL ES_AUTOHSCROLL, WS_CHILD
        0,                                                //initial x position
        0,                                                //initial y position
        (int)getWndWidth(),                                //initial x size
        (int)getWndHeight(),                            //initial y size
        m_hParentWnd,                                    //parent window handle
        NULL,                                            //window menu handle
        hInstance,                                        //program instance handle
        NULL                                            //creation parameters
        );  
   
    if (!g_hChildWin) {
        throw std::runtime_error("Could not create Message Window");
        return FALSE;
    }
    int nCmdShow = SW_SHOWNORMAL;
    ShowWindow(g_hChildWin, nCmdShow);
    UpdateWindow(g_hChildWin);

    return TRUE;
}

Thanks

Kannan