.netcore在linux下使用P/invoke方式调用linux动态库

 1 [DllImport(@"libdl.so.2")]
 2         public static extern IntPtr dlopen(string filename, int flags);
 3         [DllImport("libdl.so.2")]
 4         public static extern IntPtr dlsym(IntPtr handle, string symbol);
 5 
 6         [DllImport("libdl.so.2", EntryPoint = "dlopen")]
 7         private static extern IntPtr UnixLoadLibrary(String fileName, int flags);
 8 
 9         [DllImport("libdl.so.2", EntryPoint = "dlclose", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
10         private static extern int UnixFreeLibrary(IntPtr handle);
11 
12         [DllImport("libdl.so.2", EntryPoint = "dlsym", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
13         private static extern IntPtr UnixGetProcAddress(IntPtr handle, String symbol);
14 
15         [DllImport("libdl.so.2", EntryPoint = "dlerror", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]

 1 public class SoTester
 2     {
 3         private const string LibraryName = "libzmq";
 4 
 5         const int RTLD_NOW = 2; // for dlopen‘s flags
 6         const int RTLD_GLOBAL = 8;
 7 
 8         [DllImport(@"libdl.so.2")]
 9         public static extern IntPtr dlopen(string filename, int flags);
10         [DllImport("libdl.so.2")]
11         public static extern IntPtr dlsym(IntPtr handle, string symbol);
12 
13         [DllImport("libdl.so.2", EntryPoint = "dlopen")]
14         private static extern IntPtr UnixLoadLibrary(String fileName, int flags);
15 
16         [DllImport("libdl.so.2", EntryPoint = "dlclose", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
17         private static extern int UnixFreeLibrary(IntPtr handle);
18 
19         [DllImport("libdl.so.2", EntryPoint = "dlsym", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
20         private static extern IntPtr UnixGetProcAddress(IntPtr handle, String symbol);
21 
22         [DllImport("libdl.so.2", EntryPoint = "dlerror", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
23         private static extern IntPtr UnixGetLastError();
24 
25         public delegate int sumHandler(int a, int b);
26         public static sumHandler sumfunc = null;
27 
28         [DllImport("libNativeLib.so", EntryPoint = "sum", CallingConvention = CallingConvention.Cdecl, CharSet = CharSet.Ansi)]
29         public static extern int Sum(int a, int b);
30 
31         public void Start()
32         {
33             IntPtr libPtr = IntPtr.Zero;
34 
35             string libName = $"{AppContext.BaseDirectory}libNativeLib.so";
36 
37             libPtr = UnixLoadLibrary(libName, 2 | 8);
38 
39             //libPtr = dlopen(libName, RTLD_NOW);
40 
41             if (libPtr != IntPtr.Zero)
42                 Console.WriteLine($"调用dlopen打开{libName}成功");
43             else
44                 Console.WriteLine($"调用dlopen打开{libName}失败");
45 
46             var sumPtr = UnixGetProcAddress(libPtr, "sum");
47 
48             if (sumPtr != IntPtr.Zero)
49                 Console.WriteLine($"dlopen调用sum成功");
50             else
51                 Console.WriteLine($"dlopen调用sum失败");
52 
53             sumfunc = Marshal.GetDelegateForFunctionPointer<sumHandler>(sumPtr);
54 
55             int ret = sumfunc(1, 3);
56 
57             Console.WriteLine($"调用sum结果:{ret}");
58 
59             var sumRet = Sum(5, 7);
60 
61             Console.WriteLine($"DllImport调用sum结果:{sumRet}");
62 
63             //var libname2 = $"libc.so.6";
64             var libname2 = $"{AppContext.BaseDirectory}libzmq.so";
65             //var libname2 = $"{AppContext.BaseDirectory}libAdminConsole.so";
66             var consolePtr = UnixLoadLibrary(libname2, 2 | 8);
67             var erroPtr = UnixGetLastError();
68             Console.WriteLine($"错误描述：{Marshal.PtrToStringAnsi(erroPtr)}");
69 
70             if (consolePtr != IntPtr.Zero)
71                 Console.WriteLine($"打开{libname2}成功");
72             else
73                 Console.WriteLine($"打开{libname2}失败");
74         }
75     }