LIBMAIN.CPP

/*++ 
 
Copyright (c) 1996 Microsoft Corporation 
 
Module Name: 
 
    LibMain.cpp 
 
Abstract: 
 
    LibMain for ADsSmp.dll 
 
Author: 
 
Environment: 
 
    User mode 
 
Revision History : 
 
--*/ 
#include "adssmp.h" 
#pragma hdrstop 
 
 
//  Globals 
HINSTANCE g_hInst = NULL; 
 
ULONG g_ulObjCount = 0L;        // Number of objects alive in adssmp.dll 
ULONG g_ulLockCount = 0L;       // Number of server locks on adssmp.dll 
 
 
//+------------------------------------------------------------------------ 
// 
//  Macro that calculates the number of elements in a statically-defined 
//  array. 
//------------------------------------------------------------------------- 
#define ARRAY_SIZE(_a)  (sizeof(_a) / sizeof(_a[0])) 
 
//+------------------------------------------------------------------------ 
// Create static Namespace and Provider class factory objects 
//------------------------------------------------------------------------- 
CSampleDSProviderCF g_cfProvider; 
CSampleDSNamespaceCF g_cfNamespace; 
 
 
//+------------------------------------------------------------------------ 
// 
//  ads class factory lookup table 
// 
//------------------------------------------------------------------------- 
 
struct CLSTABLE 
{ 
    const CLSID *   pclsid; 
    IClassFactory * pCF; 
}; 
 
 
 
CLSTABLE g_aclscache[] = 
{ 
    &CLSID_SampleDSProvider,                      &g_cfProvider, 
    &CLSID_SampleDSNamespace,                     &g_cfNamespace, 
}; 
 
 
//+--------------------------------------------------------------- 
// 
//  Function:   DllGetClassObject 
// 
//  Synopsis:   Standard DLL entrypoint for locating class factories 
// 
//---------------------------------------------------------------- 
 
STDAPI 
DllGetClassObject(REFCLSID clsid, REFIID iid, LPVOID FAR* ppv) 
{ 
    HRESULT         hr; 
    size_t          i; 
 
    for (i = 0; i < ARRAY_SIZE(g_aclscache); i++) 
    { 
        if (IsEqualCLSID(clsid, *g_aclscache[i].pclsid)) 
        { 
            hr = g_aclscache[i].pCF->QueryInterface(iid, ppv); 
            RRETURN(hr); 
        } 
    } 
 
    *ppv = NULL; 
 
    return E_NOINTERFACE; 
} 
 
//+--------------------------------------------------------------- 
// 
//  Function:   DllCanUnloadNow 
// 
//  Synopsis:   Standard DLL entrypoint to determine if DLL can be unloaded 
// 
//--------------------------------------------------------------- 
 
STDAPI DllCanUnloadNow(void) { 
    if (0L==g_ulObjCount && 0L==g_ulLockCount) return ResultFromScode(S_OK); 
    else return ResultFromScode(S_FALSE); 
}      
 
//+--------------------------------------------------------------- 
// 
//  Function:   DllMain 
// 
//  Synopsis:   Standard DLL initialization entrypoint 
// 
//--------------------------------------------------------------- 
 
BOOL WINAPI 
LibMain(HINSTANCE hInst, DWORD dwReason, LPVOID pvReserved) 
{ 
         
    // Check our compatibility with the OLE runtime. 
    // We are compatible with any later major version, 
    // or the same major version with equal or greater minor version. 
    if (!IsCompatibleOleVersion(OLE_MAJ_VER, OLE_MIN_VER)) 
    { 
        return FALSE; 
    } 
 
    switch (dwReason){ 
    case DLL_PROCESS_ATTACH: 
 
        g_hInst = hInst; 
        break; 
 
 
    case DLL_PROCESS_DETACH: 
 
 
    default: 
        break; 
    } 
 
    return TRUE; 
} 
 
BOOL 
IsCompatibleOleVersion(WORD wMaj, WORD wMin) 
{ 
    // Check our compatibility with the OLE runtime. 
    // We are compatible with any later major version, 
    // or the same major version with equal or greater minor version. 
    DWORD ov = OleBuildVersion(); 
    return HIWORD(ov) > wMaj || (HIWORD(ov) == wMaj && LOWORD(ov) >= wMin); 
} 
 
 
 
//+--------------------------------------------------------------------------- 
// 
//  Function:   DllMain 
// 
//  Synopsis:   entry point for NT - post .546 
// 
//---------------------------------------------------------------------------- 
EXTERN_C BOOL WINAPI 
DllMain(HANDLE hDll, DWORD dwReason, LPVOID lpReserved) 
{ 
    return LibMain((HINSTANCE)hDll, dwReason, lpReserved); 
}