HWND *hwnd_main;

int WINAPI DllEntryPoint(HINSTANCE hInstance , DWORD fdwReason , PVOID pvReserved) {
static HANDLE hMap;

switch(fdwReason) {
case DLL_PROCESS_ATTACH:
hMap = CreateFileMapping((HANDLE)0xFFFFFFFF , NULL ,
PAGE_READWRITE , 0 , sizeof (HWND) , MAP);
hwnd_main = (DWORD *)MapViewOfFile(
hMap , FILE_MAP_WRITE , 0 , 0 , 0);
break;
case DLL_PROCESS_DETACH:
UnmapViewOfFile(pdwUsers);
CloseHandle(hMap);
}
return TRUE;
}

exeからSetMainHWND()を一回呼び出し
*hwnd_main = hWnd
といれているのですがうまくいきせん。(共有できてない?)