1     public class LoadDll
 2     {
 3         #region Win32 API : Load dll
 4         [DllImport("kernel32.dll")]
 5         public static extern IntPtr LoadLibrary(string path);
 6 
 7         [DllImport("kernel32.dll")]
 8         public static extern IntPtr GetProcAddress(IntPtr lib, string funcName);
 9 
10         [DllImport("kernel32.dll")]
11         public static extern bool FreeLibrary(IntPtr lib);
12 
13         [DllImport("kernel32.dll")]
14         public static extern IntPtr GetStdHandle(int nStdHandle);
15 
16         [DllImport("user32", EntryPoint = "CallWindowProc")]
17         public static extern int CallWindowProc(IntPtr lpPreWndFunc, int hwnd, int msg, int wParam, int lParam);
18         #endregion
19 
20         private IntPtr _dllLib;
21 
22         /// <summary>
23         /// Initializes a new instance of the <see cref="LoadDll"/> class.
24         /// </summary>
25         public LoadDll()
26         {
27             
28         }
29 
30         /// <summary>
31         /// Initializes a new instance of the <see cref="LoadDll"/> class.
32         /// </summary>
33         /// <param name="path">The path.</param>
34         public LoadDll(string path)
35         {
36             _dllLib = LoadLibrary(path);
37         }
38 
39         /// <summary>
40         /// 注销对象时释放资源
41         /// <see cref="LoadDll"/> is reclaimed by garbage collection.
42         /// </summary>
43         ~LoadDll()
44         {
45             FreeLibrary(_dllLib);
46         }
47 
48         /// <summary>
49         /// 初始化dll的路径
50         /// </summary>
51         /// <param name="path">The path.</param>
52         public void InitPath(string path)
53         {
54             if (_dllLib == IntPtr.Zero)
55                 _dllLib = LoadLibrary(path);
56         }
57 
58         /// <summary>
59         /// 根据非托管的dll中的方法名称映射成托管的委托类型
60         /// </summary>
61         /// <param name="methodName">非托管的dll中的方法名称</param>
62         /// <param name="methodType">托管的委托类型</param>
63         /// <returns></returns>
64         public Delegate InvokeMethod(string methodName, Type methodType)
65         {
66             //获取非托管的dll中方法的地址
67             var methodPtr = GetProcAddress(_dllLib, methodName);
68             //将非托管的方法转换为委托
69             return Marshal.GetDelegateForFunctionPointer(methodPtr, methodType);
70         }
71     }

1 loadDll = new LoadDll(path);
2             stop = (StopHandler)loadDll.InvokeMethod("stop", typeof(StopHandler));
3             start = (StartHandler)loadDll.InvokeMethod("start", typeof(StartHandler));
4             init = (InitHandler)loadDll.InvokeMethod("init", typeof(InitHandler));
5             query = (QueryHandler)loadDll.InvokeMethod("query", typeof(QueryHandler));
6             setDatabaseInfo = (SetDatabaseInfoHandler)loadDll.InvokeMethod("setDatabaseInfo", typeof(SetDatabaseInfoHandler));
7             setMonitorInfo = (SetMonitorInfoHandler)loadDll.InvokeMethod("setMonitorInfo", typeof(SetMonitorInfoHandler));

1 /// 插件导出方法
2 extern "C" __declspec(dllexport) void setDatabaseInfo(LPCTSTR dbServer, LPCTSTR dbUser, LPCTSTR dbPass, LPCTSTR dbName);
3 extern "C" __declspec(dllexport) void setMonitorInfo(LPCTSTR _agentBm, LPCTSTR _com);
4 extern "C" __declspec(dllexport) void init();
5 extern "C" __declspec(dllexport) void start();
6 extern "C" __declspec(dllexport) void stop();
7 extern "C" __declspec(dllexport) LPCTSTR query(LPCTSTR devname, LPCTSTR id);

1 ///<summary>
2         /// 处理Stop事件
3         ///</summary>
4         publicdelegatevoid StopHandler();
5         ///<summary>
6         /// 处理Start事件
7         ///</summary>
8         publicdelegatevoid StartHandler();
9         ///<summary>
10         /// 处理Init事件
11         ///</summary>
12         publicdelegatevoid InitHandler();
13         ///<summary>
14         /// 处理Query事件
15         ///</summary>
16         publicdelegatestring QueryHandler(string devName, string id);
17         ///<summary>
18         /// 处理SetDataBaseInfo事件
19         ///</summary>
20         publicdelegatevoid SetDatabaseInfoHandler(string server,string user,string password,string dbName);
21         ///<summary>
22         /// 处理SetMonitorInfo事件
23         ///</summary>
24         publicdelegatevoid SetMonitorInfoHandler(string agentBm, string com);