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1 /* |
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2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: |
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15 */ |
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16 |
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17 #ifndef _DST_DLL_MODULE_ |
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18 #define _DST_DLL_MODULE_ |
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19 |
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20 class CDLLModule |
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21 { |
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22 public: |
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23 CDLLModule() : m_hDLL(NULL) |
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24 { |
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25 } |
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26 virtual ~CDLLModule() //destructor, free the library |
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27 { |
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28 if (m_hDLL) |
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29 ::FreeLibrary(m_hDLL); |
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30 } |
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31 ////////////////////////////////////////////////////////////////// |
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32 // See if dll been loaded, returning true dose not mean that all |
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33 // functions of the dll is valid. |
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34 bool IsLoaded(void) |
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35 { |
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36 return m_hDLL != NULL; |
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37 } |
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38 |
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39 ///////////////////////////////////////////////////////// |
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40 // pure virtual, must implemented in derived class |
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41 // used macros to generate the implementation |
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42 virtual bool Init(LPCTSTR szDll)=0; |
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43 |
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44 protected: |
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45 HMODULE m_hDLL; |
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46 }; |
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47 |
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48 ////////////////////////////////////////////////////////////////////// |
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49 // macros to implement the Init function |
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50 #define DECLARE_DLL_FUNCTION(ret, cc, func, params) \ |
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51 ret (cc* func)params; |
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52 |
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53 #define BEGIN_DLL_INIT() \ |
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54 bool Init(LPCTSTR szDll) \ |
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55 { \ |
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56 if (m_hDLL) \ |
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57 ::FreeLibrary(m_hDLL); \ |
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58 m_hDLL = ::LoadLibrary(szDll); \ |
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59 bool bOk = true; |
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60 |
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61 #define INIT_DLL_FUNCTION(ret, cc, func, params, origin) \ |
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62 if (m_hDLL) \ |
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63 { \ |
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64 func = (ret (cc* )params)GetProcAddress(m_hDLL, origin); \ |
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65 } \ |
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66 else \ |
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67 func = NULL; \ |
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68 if (!func) \ |
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69 bOk = false; |
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70 |
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71 #define END_DLL_INIT() \ |
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72 return bOk; \ |
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73 } |
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74 |
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75 #endif |