AtlThunk_InitData function (atlthunk.h)

Initializes an ATL thunk.

Syntax

void AtlThunk_InitData(
 AtlThunkData_t *Thunk,
 void *Proc,
 size_t FirstParameter
);

Parameters

Thunk

A non-null return value from AtlThunk_AllocateData.

Proc

See the example in remarks for more info.

FirstParameter

See the example in remarks for more info.

Return value

None

Remarks

An ATL thunk has a signature of WNDPROC. See the following sample for more info on an implementation.

 LRESULT CALLBACK AtlThunk( 
 _In_ HWND hwnd, 
 _In_ UINT uMsg, 
 _In_ WPARAM wParam, 
 _In_ LPARAM lParam 
 ) 
 { 
 static void* FirstParameter; 
 static WNDPROC Proc; 
 return Proc((HWND)FirstParameter, uMsg, wParam, lParam); 
 } 

An arbitrary number of AtlThunk functions can be created; FirstParameter and Proc are set (differently) for each one.

Requirements