198 lines
8.3 KiB
C++
198 lines
8.3 KiB
C++
//----------------------------------------------------------------------------
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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 ? _hinst : (_hinst = LoadLibrary(#_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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AssertMsg(_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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AssertMsg(_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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AssertMsg(_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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// --------- OLEAUT32.DLL ---------------
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HINSTANCE g_hinstOLEAUT32 = NULL;
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, RegisterTypeLib,
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(ITypeLib *ptlib, OLECHAR *szFullPath, OLECHAR *szHelpDir), (ptlib, szFullPath, szHelpDir));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, LoadTypeLib,
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(const OLECHAR *szFile, ITypeLib **pptlib), (szFile, pptlib));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, CreateErrorInfo,
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(ICreateErrorInfo **pperrinfo), (pperrinfo));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, SetErrorInfo,
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(unsigned long dwReserved, IErrorInfo*perrinfo), (dwReserved, perrinfo));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, LoadRegTypeLib,
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(REFGUID rguid, WORD wVerMajor, WORD wVerMinor, LCID lcid, ITypeLib **pptlib),
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(rguid, wVerMajor, wVerMinor, lcid, pptlib));
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DELAY_LOAD(g_hinstOLEAUT32, OLEAUT32.DLL, BSTR, SysAllocString, (const OLECHAR*pch), (pch));
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DELAY_LOAD(g_hinstOLEAUT32, OLEAUT32.DLL, BSTR, SysAllocStringLen,
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(const OLECHAR*pch, unsigned int i), (pch, i));
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DELAY_LOAD(g_hinstOLEAUT32, OLEAUT32.DLL, BSTR, SysAllocStringByteLen,
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(LPCSTR psz, UINT i), (psz, i));
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DELAY_LOAD_UINT(g_hinstOLEAUT32, OLEAUT32.DLL, SysStringLen, (BSTR bstr), (bstr));
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DELAY_LOAD_UINT(g_hinstOLEAUT32, OLEAUT32.DLL, SysStringByteLen, (BSTR bstr), (bstr));
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DELAY_LOAD_VOID(g_hinstOLEAUT32, OLEAUT32.DLL, SysFreeString, (BSTR bs), (bs));
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DELAY_LOAD_VOID(g_hinstOLEAUT32, OLEAUT32.DLL, VariantInit, (VARIANTARG *pvarg), (pvarg));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, VariantCopy,
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(VARIANTARG *pvargDest, VARIANTARG *pvargSrc), (pvargDest, pvargSrc));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, VariantChangeType,
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(VARIANTARG *pvargDest, VARIANTARG *pvargSrc, unsigned short wFlags, VARTYPE vt),
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(pvargDest, pvargSrc, wFlags, vt));
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DELAY_LOAD_HRESULT(g_hinstOLEAUT32, OLEAUT32.DLL, VariantClear, (VARIANTARG *pvarg), (pvarg));
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#pragma warning(default:4229)
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