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            S.l.e!ep.¢%

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            DLL共享變量

            Posted on 2010-02-17 21:42 S.l.e!ep.¢% 閱讀(656) 評論(0)  編輯 收藏 引用 所屬分類: VC

            // ?The?following?ifdef?block?is?the?standard?way?of?creating?macros?which?make?exporting?
            // ?from?a?DLL?simpler.?All?files?within?this?DLL?are?compiled?with?the?TESTDLL_EXPORTS
            // ?symbol?defined?on?the?command?line.?this?symbol?should?not?be?defined?on?any?project
            // ?that?uses?this?DLL.?This?way?any?other?project?whose?source?files?include?this?file?see?
            // ?TESTDLL_API?functions?as?being?imported?from?a?DLL,?wheras?this?DLL?sees?symbols
            // ?defined?with?this?macro?as?being?exported.
            #ifdef?TESTDLL_EXPORTS
            #define ?TESTDLL_API?__declspec(dllexport)
            #else
            #define ?TESTDLL_API?__declspec(dllimport)
            #endif

            #pragma?data_seg?(
            " .shared " )
            int ?g_TestValue? = ? 0 ;
            #pragma?data_seg?()

            #pragma?comment(linker,?
            " /SECTION:.shared,RWS " )?


            TESTDLL_API?
            int ?getTestValue( void );
            TESTDLL_API?
            void ?setTestValue( int ?nValue);



            // ?testDLL.cpp?:?Defines?the?entry?point?for?the?DLL?application.
            //

            #include?
            " stdafx.h "
            #include?
            " testDLL.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;
            }

            // ?This?is?an?example?of?an?exported?function.
            TESTDLL_API? int ?getTestValue( void )
            {
            ????
            return ?g_TestValue;
            }

            TESTDLL_API?
            void ?setTestValue( int ?nValue)
            {
            ????g_TestValue?
            = ?nValue;
            }


            EXPORTS
            ????getTestValue?@
            1
            ????setTestValue?@
            2


            接下來,實踐證明一下
            BOOL?CTestCallDLLDlg::OnInitDialog()
            {
            ????CDialog::OnInitDialog();

            ????????
            //?
            ????
            ????
            //?TODO:?Add?extra?initialization?here

            ????m_hModule?
            =?::LoadLibrary("C:\\Documents?and?Settings\\Administrator\\桌面\\testDLL.dll");

            ????
            ????
            return?TRUE;??//?return?TRUE??unless?you?set?the?focus?to?a?control
            }

            void?CTestCallDLLDlg::OnButton1()?
            {
            ????typedef?
            int?(*getTestValueType)(void);
            ????getTestValueType?pfngetTestValue?
            =?(getTestValueType)::GetProcAddress(m_hModule,?"getTestValue");

            ????
            int?i?=?pfngetTestValue();

            ????CString?str;
            ????str.Format(
            "The?Value?now?is?%d",?i);
            ????AfxMessageBox(str);
            }

            void?CTestCallDLLDlg::OnButton2()?
            {
            ????typedef?
            int?(*getTestValueType)(void);
            ????getTestValueType?pfngetTestValue?
            =?(getTestValueType)::GetProcAddress(m_hModule,?"getTestValue");

            ????typedef?
            void?(*setTestValueType)(int?nValue);
            ????setTestValueType?pfnsetTestValue?
            =?(setTestValueType)::GetProcAddress(m_hModule,?"setTestValue");

            ????
            int?i?=?pfngetTestValue()?+?1;
            ????pfnsetTestValue(i);
            ????i?
            =?pfngetTestValue();

            ????CString?str;
            ????str.Format(
            "The?Value?now?is?%d",?i);
            ????AfxMessageBox(str);????
            }

            奇跡般地,兩個EXE拷到不同的地方,運行了兩個實例,它們能夠“數據共享”

            加上下面兩個功能:
            void?CTestCallDLLDlg::OnButton3()?
            {
            ????::FreeLibrary(m_hModule);
            ????m_hModule?
            =?NULL;
            }

            void?CTestCallDLLDlg::OnButton4()?
            {
            ????
            //?TODO:?Add?your?control?notification?handler?code?here
            ????m_hModule?=?::LoadLibrary("C:\\Documents?and?Settings\\Administrator\\桌面\\testDLL.dll");
            }

            就會發現,如果當所有EXE的實例都把 DLL 卸裝再 Load 時,DLL的數據會清0.......

            所以,為了“共享數據”,DLL必須至少有一個“引用(被某個EXE引用)”
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