CWPSTRUCT info Overview Group

The CWPSTRUCT structure defines the message parameters passed to a WH_CALLWNDPROC hook procedure, CallWndProc.

typedef struct tagCWPSTRUCT { // cwps 

    LPARAM  lParam; 

    WPARAM  wParam; 

    UINT    message; 

    HWND    hwnd; 

} CWPSTRUCT;

Members

lParam: Specifies additional information about the message. The exact meaning depends on the message value.
wParam: Specifies additional information about the message. The exact meaning depends on the message value.
message: Specifies the message.
hwnd: Identifies the window to receive the message.