Thread: is handle a scrollbar?

hi to everyone,

i need your help, i am checking if the handle i retrieved is a scrollbar such as VerticalScrollbar or HorizontalScrollbar, i did the enumeration of the childwindow:

BOOL EnumChildWindows(HWND hWndParent,
WNDENUMPROC lpEnumFunc,
LPARAM lParam);

and in callback function it is:

BOOL CALLBACK EnumChildProc(HWND hwnd,
LPARAM lParam);

in every enumeration for this childwindow this first param HWND hWnd receives new hWnd this hWnd now i need to know is scrollbar itself? what is the function i need to use to check each hWnd if it is Hscrollbar of Vscrollbar?

thank you!

If you pass GetClassName the hwnd and a string buffer, you can then test to see if it is "SCROLLBAR".

I think you'd have to use GetWindowLongPtr and retrieve the window style to determine if it is horizontal or not.

Originally Posted by SMurf

If you pass GetClassName the hwnd and a string buffer, you can then test to see if it is "SCROLLBAR".

I think you'd have to use GetWindowLongPtr and retrieve the window style to determine if it is horizontal or not.

================================================== ===
hi THANK YOU VERY MUCH FOR THE HELP REALLY APPRECIATED,

Types of Window Classes
There are three types of window classes:

1. System Classes
2. Application Global Classes
3. Application Local Classes
-------------------------------------
you are correct SCROLLBAR is a class under System Classes, so here when i tried your first suggestion GetClassName(...):

wchar_t ClassName[255];
int getClassName = GetClassName(hWnd, ClassName, wcslen(ClassName));

i debug the output param ClassName:
ClassName: 0031F37C (i know this is a hexa value right)

i was expecting since the datatype is wchar_t i will retrived the word "SCROLLBAR" as its classname. so how can i relate this output to the word SCROLLBAR?(maybe later on if it is HSCROLL or VSCROLL)

That would appear to be telling you the address of your buffer, not its content. How are you doing this?
Try:-

Code:

MessageBox(NULL, ClassName, NULL, MB_ICONINFORMATION);

Hi when i try to add this function:

Code:

MessageBox(hWnd, ClassName, NULL, MB_ICONINFORMATION);

- using this function it gives the class names:
MsoCommandBarDock
MsoCommandBarDock
MsoCommandBarDock
MsoCommandBar
MsoCommandBar
MsoCommandBarDock
VsChannel
VsChannel
VsChannel
VsChannel
VsStatusBar
msctls_statusbar32
msctls_progress32
Generic Pane
VsResultsListBaseToolWndClass
SysListView32

But what i am expecting is the scrollbar now here is the list of tables for CLASSES STYLES:

Code:

Class 		Description 
--------------------------------------------------------------------
Button 		The class for a button. 
ComboBox 	The class for a combo box. 
Edit 		The class for an edit control. 
ListBox 	                The class for a list box. 
MDIClient 	The class for an MDI client window. 
ScrollBar 	                The class for a scroll bar. 
Static 		The class for a static control.

Thank you very much

The thing about scrollbars is that they aren't usually implemented as independent controls, their functionality is derived by most other classes.

Including WS_HSCROLL or WS_VSCROLL styles into a window causes scrollbars to be drawn based on private data inside the base window class.

So the best way to detect them would be to use GetWindowLongPtr(GWL_STYLE) like so:-

Code:

if (GetWindowLongPtr(GWL_STYLE) & (WS_HSCROLL | WS_VSCROLL))
    MessageBox(NULL, "Scrollbars in here", NULL, MB_ICONINFORMATION);
else
    MessageBox(NULL, "No scrollbars in here", NULL, MB_ICONERROR);