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[ASP.net教程]C#调用C++ Dll


现在项目基本都是旁边C++的哥们做好dll扔给我,然后我调用。好久之前晚上down了一份c#调用c++dll的方法,出处早已经遗忘。闲来无事,放上来好了。原作者看到后可以留言,我会把您链接放上的,帮了我很多!!!

 1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Reflection; 5 using System.Reflection.Emit; 6 using System.Runtime.InteropServices; 7 using System.Text; 8  9 namespace TEDS_App 10 { 11   public enum ModePass 12   { 13     ByValue = 0x0001, 14     ByRef = 0x0002 15   } 16   public class FaultFunc 17   { 18     [DllImport("kernel32.dll")] 19     static extern IntPtr LoadLibrary(string lpFileName); 20     [DllImport("kernel32.dll")] 21     static extern IntPtr GetProcAddress(IntPtr hModule, string lpProcName); 22     [DllImport("kernel32", EntryPoint = "FreeLibrary", SetLastError = true)] 23     static extern bool FreeLibrary(IntPtr hModule); 24     private IntPtr hModule = IntPtr.Zero; 25     private IntPtr farProc = IntPtr.Zero; 26     public void LoadDll(string lpFileName) 27     { 28       hModule = LoadLibrary(lpFileName); 29       if (hModule == IntPtr.Zero) 30       { 31         throw (new Exception("没有找到:" + lpFileName + ".")); 32       } 33     } 34     public void LoadDll(IntPtr HMODULE) 35     { 36       if (HMODULE == IntPtr.Zero) 37       { 38         throw (new Exception("所传入的函数库模块的句柄为空")); 39       } 40       hModule = HMODULE; 41     } 42     public void LoadFun(string lpProcName) 43     { 44       if (hModule == IntPtr.Zero) 45       { 46         throw (new Exception("函数库模块的句柄为空,确保已进行加载dll操作")); 47       } 48       farProc = GetProcAddress(hModule, lpProcName); 49       if (farProc == IntPtr.Zero) 50       { 51         throw (new Exception("没有找到:" + lpProcName + "这个函数的入口点")); 52       } 53     } 54     public void LoadFun(string lpFileName, string lpProcName) 55     { 56       hModule = LoadLibrary(lpFileName); 57       if (hModule == IntPtr.Zero) 58       { 59         throw (new Exception("没有找到:" + lpFileName + ".")); 60       } 61       farProc = GetProcAddress(hModule, lpFileName); 62       if (farProc == IntPtr.Zero) 63       { 64         throw (new Exception("没有找到:" + lpProcName + "这个函数的入口点")); 65       } 66     } 67     public void UnLoadDll() 68     { 69       FreeLibrary(hModule); 70       hModule = IntPtr.Zero; 71       farProc = IntPtr.Zero; 72     } 73     public object Invoke(object[] ObjArray_Parameter, Type[] TypeArray_parameterType, ModePass[] ModePassArray_Parameter, Type Type_Return) 74     { 75       if (hModule == IntPtr.Zero) 76         throw (new Exception("函数库模块的句柄为空,请确保进行了LoadLll操作")); 77       if (farProc == IntPtr.Zero) 78         throw (new Exception("函数指针为空,请确保已进行LoadFun操作")); 79       if (ObjArray_Parameter.Length != ModePassArray_Parameter.Length) 80         throw (new Exception("参数个数及其传递方式的个数不匹配")); 81       AssemblyName MyAssemblyName = new AssemblyName(); 82       MyAssemblyName.Name = "InvokeFun"; 83       AssemblyBuilder MyAssemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(MyAssemblyName, AssemblyBuilderAccess.Run); 84       ModuleBuilder MyModuleBuilder = MyAssemblyBuilder.DefineDynamicModule("InvokeDll"); 85       MethodBuilder MyMethodBuilder = MyModuleBuilder.DefineGlobalMethod("FaultFun", MethodAttributes.Public | MethodAttributes.Static, Type_Return, TypeArray_parameterType); 86       ILGenerator IL = MyMethodBuilder.GetILGenerator(); 87       int i; 88       for (i = 0; i < ObjArray_Parameter.Length; i++) 89       { 90         switch (ModePassArray_Parameter[i]) 91         { 92           case ModePass.ByValue: 93             IL.Emit(OpCodes.Ldarg, i); 94             break; 95           case ModePass.ByRef: 96             IL.Emit(OpCodes.Ldarga, i); 97             break; 98           default: 99             throw (new Exception("第" + (i + 1).ToString() + "个参数没有给定正确的传递方式"));100         }101       }102       if (IntPtr.Size == 4)103       {104         IL.Emit(OpCodes.Ldc_I4, farProc.ToInt32());105       }106       else if (IntPtr.Size == 8)107       {108         IL.Emit(OpCodes.Ldc_I8, farProc.ToInt64());109       }110       else111       {112         throw new PlatformNotSupportedException();113       }114       IL.EmitCalli(OpCodes.Calli, CallingConvention.StdCall, Type_Return, TypeArray_parameterType);115       IL.Emit(OpCodes.Ret);116       MyModuleBuilder.CreateGlobalFunctions();117       MethodInfo MyMethodInfo = MyModuleBuilder.GetMethod("FaultFun");118       return MyMethodInfo.Invoke(null, ObjArray_Parameter);119     }120     public object Invoke(IntPtr IntPtr_Function, object[] ObjArray_Parameter, Type[] TypeArray_ParameterType, ModePass[] ModePassArray_Parameter, Type Type_Return)121     {122       if (hModule == IntPtr.Zero)123         throw (new Exception("函数库模块的句柄为空,请确保已进行LoadDll操作"));124       if (IntPtr_Function == IntPtr.Zero)125         throw (new Exception("函数指针IntPtr_Function为空"));126       farProc = IntPtr_Function;127       return Invoke(ObjArray_Parameter, TypeArray_ParameterType, ModePassArray_Parameter, Type_Return);128     }129   }130 131 }

一直以来,对于C++程序员报以崇高的敬意。。。一直觉得他们屌屌的,哈哈。

调用方式如下:

1 PlusFunction.LoadDll(@"C:\win32dll.dll");//PlusFunction为调用类的实例2 PlusFunction.LoadFun("MyFun");3 byte[] a = File.ReadAllBytes(@"E:\19-bw\19-73.jpg");4 object[] Parameters = new object[] {a}; // 实参为a5 Type[] ParameterTypes = new Type[] { typeof(byte[])}; // 实参类型为byte[]6 ModePass[] themode = new ModePass[] {ModePass.ByValue}; // 传送方式为值传7 Type Type_Return = typeof(int); // 返回类型为int8 ret = (int)PlusFunction.Invoke(Parameters, ParameterTypes, themode, Type_Return);

其实,c++与c#主要的就是数据类型的对应了。简单点的还好说,稍微复杂的各种麻烦。。。关键是不好调试。

下面举些我用到的例子,以后遇到其他的再补充。日积月累- -

 1 c++                  c# 2 char*                char[](string.tochararray) 3 byte*                 byte[] 4 int                  int 5 int*                  int[] 6 结构体 7 c++ 8 typedef struct SRectChange_TAG 9 {10   //NV_RECT rect;11   int x;//左上角x轴坐标12   int y;//左上角y轴坐标13   int width;//宽14   int height;//高15   int degree;//报错级别;1最低,目前暂时设定3级16 }17 SRectChange;18 c#19 [StructLayout(LayoutKind.Sequential)]20 public struct SRectChange21 {22   public int x;23   public int y;24   public int width;25   public int height;26   public int degree;27 }28 结构体传递29 [DllImport("win32dll.dll", EntryPoint = "MyFun", CallingConvention = CallingConvention.Cdecl)]30 public static extern int MyFun(ref SRectChange rect, char[] str, char[] str2);  31 c++结构体32 typedef struct   33 {  34   int osVersion;  35   int majorVersion;  36   int minorVersion;  37   int buildNum;  38   int platFormId;  39   char szVersion[128];  40 }OSINFO; 41 c#42 // OSINFO定义 43 [StructLayout(LayoutKind.Sequential)] 44 public struct OSINFO 45 { 46   public int osVersion; 47   public int majorVersion; 48   public int minorVersion; 49   public int buildNum; 50   public int platFormId; 51   [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)] 52   public string szVersion; 53 } 54 55 结构体数组传递56 c#代码57 [DllImport("win32dll.dll", EntryPoint = "MyFun", CallingConvention = CallingConvention.Cdecl)]58 public static extern int MyFun(IntPtr p, char[] str, char[] str2); 59 数组传指针60 char[] newpic = ("123123123123").ToCharArray();61 char[] oldpic = ("231231234123").ToCharArray();62 SRectChange[] rects = new SRectChange[5];63 for (int i = 0; i < rects.Length; i++)64 {65   rects[i] = new SRectChange();66 }67 IntPtr[] ptArr = new IntPtr[1];68 ptArr[0] = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SRectChange)) * 5); //分配包含两个元素的数组 69 IntPtr pt = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SRectChange)));70 Marshal.Copy(ptArr, 0, pt, 1); //拷贝指针数组71 MyFun(pt, newpic, oldpic);72 for (int i = 0; i < 5; i++)73 {74   rects[i] = (SRectChange)Marshal.PtrToStructure((IntPtr)(pt.ToInt32() + i * Marshal.SizeOf(typeof(SRectChange))), typeof(SRectChange));75   Console.WriteLine("x:{0} y:{1}", rects[i].x, rects[i].y);76 }

还说那句话:种一棵树最好的时间是十年前,其次是现在。