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AtlThunk_InitData function (atlthunk.h)

  • Article

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

Requirement Value
Minimum supported client Windows 10 [desktop apps only]
Minimum supported server Windows Server 2016 [desktop apps only]
Target Platform Windows
Header atlthunk.h
DLL Atlthunk.dll