168 lines
6.6 KiB
C++
168 lines
6.6 KiB
C++
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//----------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1997
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//
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// File:
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//
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// Contents:
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//
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// Classes:
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//
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// Functions:
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//
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// History:
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//
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//----------------------------------------------------------------------------
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#include "private.h"
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#include <winsock.h>
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#pragma warning(disable:4229) // No warnings when modifiers used on data
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//----------------------------------------------------------------------------
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// Delay loading mechanism. [Stolen from shdocvw.]
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//
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// This allows you to write code as if you are
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// calling implicitly linked APIs, and yet have these APIs really be
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// explicitly linked. You can reduce the initial number of DLLs that
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// are loaded (load on demand) using this technique.
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//
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// Use the following macros to indicate which APIs/DLLs are delay-linked
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// and -loaded.
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//
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// DELAY_LOAD
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// DELAY_LOAD_HRESULT
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// DELAY_LOAD_SAFEARRAY
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// DELAY_LOAD_UINT
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// DELAY_LOAD_INT
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// DELAY_LOAD_VOID
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//
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// Use these macros for APIs that are exported by ordinal only.
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//
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// DELAY_LOAD_ORD
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// DELAY_LOAD_ORD_VOID
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//
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// Use these macros for APIs that only exist on the integrated-shell
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// installations (i.e., a new shell32 is on the system).
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//
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// DELAY_LOAD_SHELL
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// DELAY_LOAD_SHELL_HRESULT
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// DELAY_LOAD_SHELL_VOID
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//
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//----------------------------------------------------------------------------
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#define ENSURE_LOADED(_hinst, _dll, pszfn) (_hinst ? TRUE : NULL!=(_hinst = LoadLibrary(TEXT(#_dll))))
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#define DELAY_LOAD_ERR(_hinst, _dll, _ret, _fn, _args, _nargs, _err) \
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static _ret (* __stdcall _pfn##_fn) _args = NULL; \
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_ret __stdcall _fn _args \
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{ \
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if (!ENSURE_LOADED(_hinst, _dll, #_fn)) \
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{ \
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ASSERT_MSGA(_hinst!=NULL, "LoadLibrary failed on " ## #_dll); \
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return (_ret)_err; \
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} \
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if (_pfn##_fn == NULL) \
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{ \
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*(FARPROC*)&(_pfn##_fn) = GetProcAddress(_hinst, #_fn); \
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ASSERT_MSGA(_pfn##_fn!=NULL, "GetProcAddress failed on " ## #_fn); \
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if (_pfn##_fn == NULL) \
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return (_ret)_err; \
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} \
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return _pfn##_fn _nargs; \
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}
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#define DELAY_LOAD_VOID(_hinst, _dll, _fn, _args, _nargs) \
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void __stdcall _fn _args \
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{ \
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static void (* __stdcall _pfn##_fn) _args = NULL; \
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if (!ENSURE_LOADED(_hinst, _dll, #_fn)) \
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{ \
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AssertMsg(_hinst!=NULL, "LoadLibrary failed on " ## #_dll); \
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return; \
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} \
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if (_pfn##_fn == NULL) \
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{ \
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*(FARPROC*)&(_pfn##_fn) = GetProcAddress(_hinst, #_fn); \
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ASSERT_MSGA(_pfn##_fn!=NULL, "GetProcAddress failed on " ## #_fn); \
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if (_pfn##_fn == NULL) \
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return; \
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} \
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_pfn##_fn _nargs; \
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}
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#define DELAY_LOAD(_hinst, _dll, _ret, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, _ret, _fn, _args, _nargs, 0)
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#define DELAY_LOAD_HRESULT(_hinst, _dll, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, HRESULT, _fn, _args, _nargs, E_FAIL)
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#define DELAY_LOAD_SAFEARRAY(_hinst, _dll, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, SAFEARRAY *, _fn, _args, _nargs, NULL)
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#define DELAY_LOAD_DWORD(_hinst, _dll, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, DWORD, _fn, _args, _nargs, 0)
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#define DELAY_LOAD_UINT(_hinst, _dll, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, UINT, _fn, _args, _nargs, 0)
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#define DELAY_LOAD_INT(_hinst, _dll, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, INT, _fn, _args, _nargs, 0)
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#define DELAY_LOAD_ORD_ERR(_hinst, _dll, _ret, _fn, _ord, _args, _nargs, _err) \
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_ret __stdcall _fn _args \
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{ \
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static _ret (* __stdcall _pfn##_fn) _args = NULL; \
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if (!ENSURE_LOADED(_hinst, _dll, "(ordinal " ## #_ord ## ")")) \
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{ \
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TraceMsg(TF_ERROR, "LoadLibrary failed on " ## #_dll); \
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return (_ret)_err; \
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} \
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if (_pfn##_fn == NULL) \
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{ \
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*(FARPROC*)&(_pfn##_fn) = GetProcAddress(_hinst, (LPSTR) _ord); \
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\
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/* GetProcAddress always returns non-NULL, even for bad ordinals. \
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But do the check anyways... */ \
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\
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if (_pfn##_fn == NULL) \
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return (_ret)_err; \
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} \
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return _pfn##_fn _nargs; \
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}
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#define DELAY_LOAD_ORD_VOID(_hinst, _dll, _fn, _ord, _args, _nargs) \
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void __stdcall _fn _args \
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{ \
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static void (* __stdcall _pfn##_fn) _args = NULL; \
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if (!ENSURE_LOADED(_hinst, _dll, "(ordinal " ## #_ord ## ")")) \
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{ \
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TraceMsg(TF_ERROR, "LoadLibrary failed on " ## #_dll); \
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return; \
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} \
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if (_pfn##_fn == NULL) \
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{ \
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*(FARPROC*)&(_pfn##_fn) = GetProcAddress(_hinst, (LPSTR) _ord); \
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\
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/* GetProcAddress always returns non-NULL, even for bad ordinals. \
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But do the check anyways... */ \
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\
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if (_pfn##_fn == NULL) \
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return; \
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} \
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_pfn##_fn _nargs; \
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}
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#define DELAY_LOAD_ORD(_hinst, _dll, _ret, _fn, _ord, _args, _nargs) DELAY_LOAD_ORD_ERR(_hinst, _dll, _ret, _fn, _ord, _args, _nargs, 0)
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//
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// And now the DLLs which are delay loaded
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//
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// --------- PSTOREC.DLL ---------------
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HINSTANCE g_hinstPSTOREC = NULL;
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DELAY_LOAD_ERR(g_hinstPSTOREC, PSTOREC.DLL, HRESULT, PStoreCreateInstance,
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(IPStore ** ppProvider, PST_PROVIDERID *pProviderID, void *pReserved, DWORD dwFlags),
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(ppProvider, pProviderID, pReserved, dwFlags),
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E_FAIL);
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void UnloadPStore()
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{
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if (g_hinstPSTOREC)
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FreeLibrary(g_hinstPSTOREC);
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g_hinstPSTOREC = NULL;
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}
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#pragma warning(default:4229)
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