NMHDR

The NMHDR structure contains information about a notification message. The pointer to this structure is specified as the lParam member of the WM_NOTIFY message.

typedef struct tagNMHDR {

HWND hwndFrom;

UINT idFrom;

UINT code;

} NMHDR;

Members

hwndFrom

Window handle of control sending message

idFrom

Identifier of control sending message

code

Specifies the notification code. This member can be a control-specific notification code, or it can be one of the following common notification values:

Value	Meaning
NM_CLICK	The user has clicked the left mouse button within the control.
NM_DBLCLK	The user has double-clicked the left mouse button within the control.
NM_KILLFOCUS	The control has lost the input focus.
NM_OUTOFMEMORY	The control could not complete an operation because there was not enough memory available.
NM_RCLICK	The user has clicked the right mouse button within the control.
NM_RDBLCLK	The user has double-clicked the right mouse button within the control.
NM_RETURN	The control has the input focus, and the user has pressed the ENTER key.
NM_SETFOCUS	The control has received the input focus.

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