// Setup.h
#ifdef SETUP_EXPORTS
#define SETUP_API __declspec(dllexport)
#else
#define SETUP_API __declspec(dllimport)
#endif

// This class is exported from the Setup.dll
class SETUP_API CSetup {
public:
    CSetup(void);
    // TODO: add your methods here.
};

bool IsMyMethod(HWND  hwndParent);

// Setup.cpp : Defines the entry point for the DLL application.
//

#include "stdafx.h"
#include "ce_setup.h"
#include "Setup.h"

BOOL APIENTRY DllMain( HANDLE hModule,
                       DWORD  ul_reason_for_call,
                       LPVOID lpReserved
                     )
{
    switch (ul_reason_for_call)
    {
    case DLL_PROCESS_ATTACH:
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}
// ----------------------------------------------------------
// Variables, constants...

TCHAR ErrorMessageTitle[] = _T("Setup Notice");

TCHAR ErrorMessageNet[] =  _T("My error message.\n");

// ----------------------------------------------------------
// This function will be called when the user
// tries to install the cab. According to its return
// value the installation continues or is cancelled.
//// To continue installation, return codeINSTALL_INIT_CONTINUE
// If you want to cancel installation,
// return codeINSTALL_INIT_CANCEL
codeINSTALL_INIT Install_Init(HWND hwndParent, BOOL  fFirstCall, BOOL fPreviouslyInstalled, LPCTSTR pszInstallDir )
{
    if( fFirstCall && ::IsMyMethod(hwndParent) == false ){
            ::MessageBox(hwndParent, ErrorMessageNet, ErrorMessageTitle, MB_OK);
            return codeINSTALL_INIT_CANCEL;
    }

    return codeINSTALL_INIT_CONTINUE;
}

// ----------------------------------------------------------
// To exit the installation DLL normally,
// return codeINSTALL_EXIT_DONE
// To unistall the application after the function exits,
// return codeINSTALL_EXIT_UNINSTALL
codeINSTALL_EXIT Install_Exit(
                                HWND    hwndParent,
                                LPCTSTR pszInstallDir,
                                WORD    cFailedDirs,
                                WORD    cFailedFiles,
                                WORD    cFailedRegKeys,
                                WORD    cFailedRegVals,
                                WORD    cFailedShortcuts
                            )
{
    return codeINSTALL_EXIT_DONE;
}

// ----------------------------------------------------------
// To continue uninstallation, return codeUNINSTALL_INIT_CONTINUE
// If you want to cancel installation,
// return codeUNINSTALL_INIT_CANCEL
codeUNINSTALL_INIT Uninstall_Init(HWND hwndParent, LPCTSTR pszInstallDir)
{
    return codeUNINSTALL_INIT_CONTINUE;
}

// ----------------------------------------------------------
codeUNINSTALL_EXIT Uninstall_Exit(HWND    hwndParent)
{
    return codeUNINSTALL_EXIT_DONE;
}

// ----------------------------------------------------------
// This is the constructor of a class that has been exported.
// see Setup.h for the class definition
CSetup::CSetup()
{
    return;
}

// ----------------------------------------------------------
// Your own system checking or settings...
bool IsMyMethod(HWND  hwndParent)
{
    // Do system check here
    // return true or false
    return true;
}