用宏定义封装LoadLibrary，方便的动态加载dll

同学们动态加载dll的时候是不是感觉挺麻烦的，每次都::LoadLibrary，::GetProcAddress，还要typedef一堆函数。最近闲来无聊，用宏封装了一下，可以少写不少代码，用来也挺方便的。
不过最多支持5个参数，同学们可以自己加。等着下次用flexbison写一个生成工具，我感觉还是不错的。
  1 #pragma once
  2 /*! rief 动态加载dll，并调用导出函数
  3 author:12178761@qq.com
  4 */
  5 #define DLLLOADER_BEGIN( NAME)
  6 class DLLLOADER_##NAME
  7 {
  8 public:
  9     static BOOL Init( LPCWSTR sDllPath){
 10     if ( RefHModule())
 11         {
 12         return TRUE;
 13         }
 14         RefHModule() = ::LoadLibrary( sDllPath);
 15         if ( !RefHModule())
 16         {
 17         return FALSE;
 18         }
 19         return TRUE;
 20     }
 21     static void UnInit(){
 22     if ( RefHModule())
 23         {
 24         FreeLibrary( RefHModule());
 25         RefHModule() = NULL;
 26         }
 27     }
 28     static HMODULE& RefHModule(){
 29     static HMODULE M = NULL;
 30     return M;
 31     }
 32 #define DLLLOADER_ENTRY_0( FUNNAME, FUNDESC, FUNRET, FUNRETDEF)
 33     typedef FUNRET (FUNDESC *_##FUNNAME)();
 34     static _##FUNNAME Ref##FUNNAME(){
 35     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
 36     return F;
 37     }
 38     static FUNRET FUNNAME(){
 39     if ( Ref##FUNNAME())
 40         {
 41         return Ref##FUNNAME()();
 42         }
 43         return FUNRETDEF;
 44     }
 45 #define DLLLOADER_ENTRY_VOID0( FUNNAME, FUNDESC)
 46     typedef void (FUNDESC *_##FUNNAME)();
 47     static _##FUNNAME Ref##FUNNAME(){
 48     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
 49     return F;
 50     }
 51     static void FUNNAME(){
 52     if ( Ref##FUNNAME())
 53         {
 54         Ref##FUNNAME()();
 55         }
 56     }
 57 #define DLLLOADER_ENTRY_1( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1)
 58     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1);
 59     static _##FUNNAME Ref##FUNNAME(){
 60     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
 61     return F;
 62     }
 63     static FUNRET FUNNAME( PARAMTYPE1 PARAM1){
 64     if ( Ref##FUNNAME())
 65         {
 66         return Ref##FUNNAME()( PARAM1);
 67         }
 68         return FUNRETDEF;
 69     }
 70 #define DLLLOADER_ENTRY_VOID1( FUNNAME, FUNDESC, PARAMTYPE1)
 71     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1);
 72     static _##FUNNAME Ref##FUNNAME(){
 73     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
 74     return F;
 75     }
 76     static void FUNNAME( PARAMTYPE1 PARAM1){
 77     if ( Ref##FUNNAME())
 78         {
 79         Ref##FUNNAME()( PARAM1);
 80         }
 81     }
 82 #define DLLLOADER_ENTRY_2( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1, PARAMTYPE2)
 83     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2);
 84     static _##FUNNAME Ref##FUNNAME(){
 85     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
 86     return F;
 87     }
 88     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2){
 89     if ( Ref##FUNNAME())
 90         {
 91         return Ref##FUNNAME()( PARAM1, PARAM2);
 92         }
 93         return FUNRETDEF;
 94     }
 95 #define DLLLOADER_ENTRY_VOID2( FUNNAME, FUNDESC, PARAMTYPE1, PARAMTYPE2)
 96     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2);
 97     static _##FUNNAME Ref##FUNNAME(){
 98     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
 99     return F;
100     }
101     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2){
102     if ( Ref##FUNNAME())
103         {
104         Ref##FUNNAME()( PARAM1, PARAM2);
105         }
106     }
107 #define DLLLOADER_ENTRY_3( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1, PARAMTYPE2, PARAMTYPE3)
108     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3);
109     static _##FUNNAME Ref##FUNNAME(){
110     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
111     return F;
112     }
113     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3){
114     if ( Ref##FUNNAME())
115         {
116         return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3);
117         }
118         return FUNRETDEF;
119     }
120 #define DLLLOADER_ENTRY_VOID3( FUNNAME, FUNDESC, PARAMTYPE1, PARAMTYPE2, PARAMTYPE3)
121     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3);
122     static _##FUNNAME Ref##FUNNAME(){
123     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
124     return F;
125     }
126     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3){
127     if ( Ref##FUNNAME())
128         {
129         Ref##FUNNAME()( PARAM1, PARAM2, PARAM3);
130         }
131     }
132 #define DLLLOADER_ENTRY_4( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1,
133 PARAMTYPE2, PARAMTYPE3, PARAMTYPE4)
134     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3, PARAMTYPE4);
135     static _##FUNNAME Ref##FUNNAME(){
136     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
137     return F;
138     }
139     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4){
140     if ( Ref##FUNNAME())
141         {
142         return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4);
143         }
144         return FUNRETDEF;
145     }
146 #define DLLLOADER_ENTRY_VOID4( FUNNAME, FUNDESC, PARAMTYPE1,
147 PARAMTYPE2, PARAMTYPE3, PARAMTYPE4)
148     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, PARAMTYPE2, PARAMTYPE3, PARAMTYPE4);
149     static _##FUNNAME Ref##FUNNAME(){
150     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
151     return F;
152     }
153     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4){
154     if ( Ref##FUNNAME())
155         {
156         Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4);
157         }
158     }
159 #define DLLLOADER_ENTRY_5( FUNNAME, FUNDESC, FUNRET, FUNRETDEF, PARAMTYPE1,
160     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5)
161     typedef FUNRET (FUNDESC *_##FUNNAME)(PARAMTYPE1, 
162     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5);
163     static _##FUNNAME Ref##FUNNAME(){
164     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
165     return F;
166     }
167     static FUNRET FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, 
168     PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4, PARAMTYPE5 PARAM5){
169     if ( Ref##FUNNAME())
170         {
171         return Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5);
172         }
173         return FUNRETDEF;
174     }
175 #define DLLLOADER_ENTRY_VOID5( FUNNAME, FUNDESC, PARAMTYPE1,
176     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5)
177     typedef void (FUNDESC *_##FUNNAME)(PARAMTYPE1, 
178     PARAMTYPE2, PARAMTYPE3, PARAMTYPE4, PARAMTYPE5);
179     static _##FUNNAME Ref##FUNNAME(){
180     _##FUNNAME F = (_##FUNNAME)::GetProcAddress( RefHModule(), #FUNNAME);
181     return F;
182     }
183     static void FUNNAME( PARAMTYPE1 PARAM1, PARAMTYPE2 PARAM2, 
184     PARAMTYPE3 PARAM3, PARAMTYPE4 PARAM4, PARAMTYPE5 PARAM5){
185     if ( Ref##FUNNAME())
186         {
187         Ref##FUNNAME()( PARAM1, PARAM2, PARAM3, PARAM4, PARAM5);
188         }
189     }
190 #define DLLLOADER_END()
191 };
192 
193 /*
194 例子：
195 DLLLOADER_BEGIN( SAMPLE)
196 DLLLOADER_ENTRY_0( Function1, BOOL, FALSE, )
197 DLLLOADER_ENTRY_VOID0( Function2, )
198 DLLLOADER_ENTRY_1( Function3, BOOL, FALSE, , LPCWSTR)
199 DLLLOADER_END()
200 
201 DLLLOADER_BEGIN(KERNEL32)
202 DLLLOADER_ENTRY_1( LoadLibraryW, WINAPI, HMODULE, 0, LPCWSTR)
203 DLLLOADER_ENTRY_3( GetModuleFileNameW, WINAPI, DWORD, 0, HMODULE, LPWSTR, DWORD)
204 DLLLOADER_END()
205 
206 int _tmain(int argc, _TCHAR* argv[])
207 {
208     DLLLOADER_SAMPLE::Init( L"C:\Users\sosopop\Documents\Visual Studio 2005\Projects\testHandle\debug\testLoadDll.dll");
209     DLLLOADER_SAMPLE::Function1();
210     DLLLOADER_SAMPLE::Function2();
211     DLLLOADER_SAMPLE::Function3(L"Function3 Hello");
212     DLLLOADER_SAMPLE::Function4(L"Function4", L"Hello");
213     DLLLOADER_SAMPLE::UnInit();
214 
215     DLLLOADER_KERNEL32::Init( L"c:\windows\system32\kernel32.dll");
216     HMODULE h =DLLLOADER_KERNEL32::LoadLibraryW( L"user32.dll");
217     WCHAR sFileName[MAX_PATH]={0};
218     DWORD nSize = DLLLOADER_KERNEL32::GetModuleFileNameW( NULL, sFileName, _countof(sFileName));
219 
220     return 0;
221 }
222 */