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I am writing a DLL which make some operations on a particular window, but sometimes the handle passed is not valid. Does there exist any function to validate that the handle passed is valid (belongs to a window)?
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First method: You can try to duplicate the handle you want to check on validity. Basically, invalid handles can not be duplicated. Second method: The DuplicateHandle function does search the Win32 handle descriptor table from beginning for an empty record to reuse it and so assign into it a duplicated handle.
Yes. There are only a finite number of values a handle can be represented by, so Windows has to reuse them eventually.
Hi Fardeen, a Window Handle is a unique identifier that holds the address of all the windows. This is basically a pointer to a window, which returns the string value. This window handle function helps in getting the handles of all the windows. It is guaranteed that each browser will have a unique window handle.
HANDLEs are defined as void pointers (void*). They are used as unique identifiers to each Windows object in our program such as a button, a window an icon, etc. Specifically their definition follows: typedef PVOID HANDLE; and typedef void *PVOID; In other words HANDLE = void*.
Try using the IsWindow function, which is declared in the Windows unit.
function IsWindow(hWnd: HWND): BOOL; stdcall;
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