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NF:commctrl.SetWindowSubclass |
SetWindowSubclass function (commctrl.h) |
Installs or updates a window subclass callback. |
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shell\SetWindowSubclass.htm |
shell |
0b11144d-eb4e-462c-96d3-38c4bac48f2a |
12/05/2018 |
SetWindowSubclass, SetWindowSubclass function [Windows Shell], commctrl/SetWindowSubclass, inet_SetWindowSubclass, shell.SetWindowSubclass |
commctrl.h |
Windows |
Windows XP [desktop apps only] |
Windows Server 2003 [desktop apps only] |
Comctl32.lib |
Comctl32.dll (version 5.8 or later) |
Windows |
19H1 |
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ext-ms-win-shell-comctl32-window-l1-1-0 (introduced in Windows 10, version 10.0.14393) |
Installs or updates a window subclass callback.
Type: HWND
The handle of the window being subclassed.
Type: SUBCLASSPROC
A pointer to a window procedure. This pointer and the subclass ID uniquely identify this subclass callback. For the callback function prototype, see SUBCLASSPROC.
Type: UINT_PTR
The subclass ID. This ID together with the subclass procedure uniquely identify a subclass. To remove a subclass, pass the subclass procedure and this value to the RemoveWindowSubclass function. This value is passed to the subclass procedure in the uIdSubclass parameter.
Type: DWORD_PTR
DWORD_PTR to reference data. The meaning of this value is determined by the calling application. This value is passed to the subclass procedure in the dwRefData parameter. A different dwRefData is associated with each combination of window handle, subclass procedure and uIdSubclass.
Type: BOOL
TRUE if the subclass callback was successfully installed; otherwise, FALSE.
Subclass callbacks are identified by the combination of the callback address and the caller-defined subclass ID. If the callback address and ID pair have not yet been installed, then this function installs the subclass. If the pair has already been installed, then this function just updates the reference data.
Each callback can store a single DWORD_PTR of reference data, which is passed to the callback function when it is called to filter messages. No reference counting is performed for the callback; it may repeatedly call SetWindowSubclass to alter the value of its reference data element.