Pourquoi Erreur de Compilation

voici mon code:
HelloCPL.h

Code:

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#ifdef HELLOCPL_EXPORTS
#define HELLOCPL_API __declspec(dllexport)
#else
#define HELLOCPL_API __declspec(dllimport)
#endif
 
HelloCPL.cpp
 
// HelloCPL.cpp : Defines the entry point for the DLL
//
#include "stdafx.h"    // Auto-generated by wizard.
#include "HelloCPL.h"  // Auto-generated by wizard.
#include "resource.h"  // Auto-generated at compile time
 
#include <tchar.h>     // General text functions.
#include "cpl.h"       // Control Panel support.
 
// Returns the number of characters in an expression.
#define lengthof(exp) ((sizeof((exp)))/sizeof((*(exp))))
 
HMODULE g_hModule = NULL;   // Handle to the DLL.
 
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// Main entry point for the Control Panel DLL.
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
extern "C" BOOL APIENTRY DllMain(HANDLE hModule,DWORD  ul_reason_for_call,LPVOID lpReserved)
{
 
  switch (ul_reason_for_call)
  {
    case DLL_PROCESS_ATTACH:
    {
      g_hModule = (HMODULE) hModule;
    }
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
       break;
    }
    return TRUE;
}
 
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
// The entry point to the Control Panel application.
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
ligne 40------>  extern "C" HelloCPL_API LONG CALLBACK CPlApplet(HWND hwndCPL,
                  UINT message, LPARAM lParam1, LPARAM lParam2)
{
  switch (message)
  {
    case CPL_INIT:
      // Perform global initializations, especially memory
      // allocations, here.
      // Return 1 for success or 0 for failure.
      // Control Panel does not load if failure is returned.
      return 1;

Apres Built jobtiens lerreur suivante:

Code:

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HelloCPL.cpp(40) : error C2144: syntax error : 'LONG' should be preceded by ';'
HelloCPL.cpp(40) : error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

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