方法一:P/Invoke调用非托管代码的方法
[DllImport("camnpr.dll")]
static extern Int32 Jie(Int32 arg);
方法二:LoadLibrary动态调用
[DllImport("Kernel32")]
publicstaticexternintGetProcAddress(inthandle,Stringfuncname);
[DllImport("Kernel32")]
publicstaticexternintLoadLibrary(Stringfuncname);
[DllImport("Kernel32")]
publicstaticexternintFreeLibrary(inthandle);
方法三:反射调用
1 /// <summary>
2 /// 获取DLL中函数
3 /// </summary>
4 /// <param name="dllName">DLL文件的名字(路径),如果在PATH环境变量下或当期目录中则可以直接指定DLL的名字,否则应包括其路径信息</param>
5 /// <param name="methodName">函数名字</param>
6 /// <param name="returnType">返回类型</param>
7 /// <param name="paramTypes">参数类型,如果无参数则为null</param>
8 /// <param name="declareCallingConvertions">生成的函数的调用约定</param>
9 /// <param name="nativeCallingConvertions">DLL函数的调用约定</param>
10 /// <param name="nativeCharSet">字符集</param>
11 /// <returns>代表指定DLL中指定函数的MethodInfo,是一个静态方法</returns>
12 public static MethodInfo GetMethodInfoInDll(string dllName, string methodName,
13 Type returnType, Type[] paramTypes,
14 CallingConventions declareCallingConvertions,
15 System.Runtime.InteropServices.CallingConvention nativeCallingConvertions,
16 System.Runtime.InteropServices.CharSet nativeCharSet)
17 {
18 AssemblyName assemblyName=new AssemblyName("Assembly"+Environment.TickCount);
19 AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly( assemblyName, AssemblyBuilderAccess.Run);
20 ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyName.Name);
21
22 MethodInfo method = moduleBuilder.DefinePInvokeMethod(methodName, dllName,
23 MethodAttributes.PinvokeImpl | MethodAttributes.Static | MethodAttributes.Public,
24 declareCallingConvertions, returnType, paramTypes,
25 nativeCallingConvertions, nativeCharSet);
26
27
28 moduleBuilder.CreateGlobalFunctions();
29
30 MethodInfo methodInfo = moduleBuilder.GetMethod(methodName,paramTypes);
31
32 return methodInfo;
33
34 }