인젝션시메세지박스가 안떠요

#include stdafx.h
#include windows.hDWORD WINAPI Main(void)
{
DWORD cshell;while(1)
{
Sleep(100); if (GetAsyncKeyState(VK_INSERT) & 0x8000)
{
cshell = (DWORD)GetModuleHandleA(cshell.dll) + 0x27C6A;
*(DWORD*)(cshell) = 61179151;//
}}
return 0;
}BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
MessageBoxA(NULL,abcd,abc,MB_OK);//
CreateThread(0, 0, (LPTHREAD_START_ROUTINE)&Main, 0, 0, 0);
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}제가아직초본데 소스에무슨문제가잇나요 ?? 이렇게햇는데 메박이안떠요