How to get a pointer from a window handle?

[dullboy]

Is there any win32 API to do that? Thanks for your inputs.

[wonder88]

CWnd::FromHandle
static CWnd* PASCAL FromHandle( HWND hWnd );

Return Value

Returns a pointer to a CWnd object when given a handle to a window. If a CWnd object is not attached to the handle, a temporary CWnd object is created and attached.

The pointer may be temporary and should not be stored for later use.

Parameters

hWnd

An HWND of a Windows window.

[dullboy]

Thanks for your reply. But I am using CWindow not CWnd. Any idea? Thanks.

CWnd::FromHandle
static CWnd* PASCAL FromHandle( HWND hWnd );

Return Value

Returns a pointer to a CWnd object when given a handle to a window. If a CWnd object is not attached to the handle, a temporary CWnd object is created and attached.

The pointer may be temporary and should not be stored for later use.

Parameters

hWnd

An HWND of a Windows window.

[humptydumpty]

try this
Retrieves the current window handle.

HRESULT GetWindowHandle(
HWND *pHwnd);

Parameters

pHwnd
[out] Window handle.
Return Values

Returns a pointer to the window handle.

[wonder88]

CWindow::CWindow
This constructor initializes the m_hWnd data member to hWnd, which by default is NULL.

The CWindow::CWindow method does not create a window. Classes CWindowImpl, CContainedWindow, and CDialogImpl ,all of which derive from CWindow, provide a method to create a window or dialog box, which is then assigned to CWindow::m_hWnd. You can also use the CreateWindow Windows CE function.

CWindow(
HWND hWnd = NULL);
Parameters
hWnd
[in] The handle to a window.


CWindow::Attach
This method attaches the window identified by hWndNew to the CWindow object.

void Attach(
HWND hWndNew );
Parameters
hWndNew
[in] The handle to a window.
Example
// The following example attaches an HWND to the CWindow object.
HWND hWndFoo = ::GetDesktopWindow();
CWindow fooWindow;
fooWindow.Attach(hWndFoo);

[dullboy]

But I am looking for a win32 API.

try this
Retrieves the current window handle.

HRESULT GetWindowHandle(
HWND *pHwnd);

Parameters

pHwnd
[out] Window handle.
Return Values

Returns a pointer to the window handle.

[Paul McKenzie]

But I am looking for a win32 API.

The Windows API knows nothing about CWindow, CWnd, or any C++ classes used by MFC, ATL, whatever. The next question is "convert HWND to a pointer to what?"

All the API knows is that a window is an HWND. An HWND is whatever it is. This is the type you deal with in an API program, and you don't assume it is a pointer, or a struct, or a class, etc. It is a "HANDLE", which means it represents something that Windows knows about internally that you need not know about.

All you need to know is that HWND is used to represent a window, and you pass it back and forth between your app and the API functions.

For what reason do you need to convert an HWND to a pointer (to something)?

Regards,

Paul McKenzie