170 lines
6.9 KiB
C
170 lines
6.9 KiB
C
#include "cabinet.h"
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#include <desktray.h>
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#include "uemapp.h"
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#pragma warning(disable:4229) // No warnings when modifiers used on data
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// Delay loading mechanism. 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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// These macros produce code that looks like
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#if 0
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BOOL GetOpenFileNameA(LPOPENFILENAME pof)
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{
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static BOOL (*pfnGetOpenFileNameA)(LPOPENFILENAME pof);
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if (ENSURE_LOADED(g_hinstCOMDLG32, "COMDLG32.DLL"))
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{
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if (pfnGetOpenFileNameA == NULL)
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pfnGetOpenFileNameA = (BOOL (*)(LPOPENFILENAME))GetProcAddress(g_hinstCOMDLG32, "GetOpenFileNameA");
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if (pfnGetOpenFileNameA)
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return pfnGetOpenFileNameA(pof);
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}
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return -1;
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}
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#endif
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/**********************************************************************/
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#ifdef DEBUG
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void _DumpLoading(LPTSTR pszDLL, LPTSTR pszFunc)
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{
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if (g_dwDumpFlags & DF_DELAYLOADDLL)
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{
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TraceMsg(TF_ALWAYS, "DLLLOAD: Loading %s for the first time for %s",
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pszDLL, pszFunc);
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}
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}
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#define ENSURE_LOADED(_hinst, _dll, pszfn) (_hinst ? _hinst : (_DumpLoading(TEXT(#_dll), pszfn), _hinst = LoadLibrary(TEXT(#_dll))))
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#else
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#define ENSURE_LOADED(_hinst, _dll, pszfn) (_hinst ? _hinst : (_hinst = LoadLibrary(TEXT(#_dll))))
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#endif // DEBUG
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#define DELAY_LOAD_ERR(_hinst, _dll, _ret, _fn, _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, TEXT(#_fn))) \
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{ \
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/*ASSERT_MSG((BOOL)_hinst, "LoadLibrary failed on " ## #_dll);*/ \
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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, #_fn); \
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/*ASSERT_MSG(NULL != _pfn##_fn, "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(_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_BOOL(_hinst, _dll, _fn, _args, _nargs) DELAY_LOAD_ERR(_hinst, _dll, BOOL, _fn, _args, _nargs, FALSE)
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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, TEXT(#_fn))) \
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{ \
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/*AssertMsg((BOOL)_hinst, "LoadLibrary failed on " ## #_dll);*/ \
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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, #_fn); \
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/*AssertMsg(NULL != _pfn##_fn, "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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//
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// For private entrypoints exported by ordinal.
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//
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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, TEXT("(ordinal ") TEXT(#_ord) TEXT(")"))) \
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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(_hinst, _dll, _ret, _fn, _ord, _args, _nargs) DELAY_LOAD_ORD_ERR(_hinst, _dll, _ret, _fn, _ord, _args, _nargs, 0)
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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, TEXT("(ordinal ") TEXT(#_ord) TEXT(")"))) \
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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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#pragma warning(default:4229)
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