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Defines the prototype for the callback function used by RemoveWindowSubclass and SetWindowSubclass.
Syntax
SUBCLASSPROC Subclassproc;
LRESULT Subclassproc(
HWND hWnd,
UINT uMsg,
WPARAM wParam,
LPARAM lParam,
UINT_PTR uIdSubclass,
DWORD_PTR dwRefData
)
{...}
Parameters
hWnd
Type: HWND
The handle to the subclassed window.
uMsg
Type: UINT
The message being passed.
wParam
Type: WPARAM
Additional message information. The contents of this parameter depend on the value of uMsg.
lParam
Type: LPARAM
Additional message information. The contents of this parameter depend on the value of uMsg.
uIdSubclass
Type: UINT_PTR
The subclass ID.
dwRefData
Type: DWORD_PTR
The reference data provided to the SetWindowSubclass function. This can be used to associate the subclass instance with a "this" pointer.
Return value
Type: LRESULT
The return value is the result of the message processing and depends on the message sent.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows XP [desktop apps only] |
| Minimum supported server | Windows Server 2003 [desktop apps only] |
| Target Platform | Windows |
| Header | commctrl.h |