.net 对本机库的动态调用

我尝试从原生C++ DLL调用函数，由名称、参数和返回类型给出。 现在，我有问题，使代表编组

我正在这样做：

Object^ Invike(Type^ Return_Type, array<Type^>^ Types, array<Object^>^ Parameters)
{
 //demo data
 Return_Type=long::typeid;
 Types = gcnew array < Type^ > {String::typeid, int::typeid};
 Parameters = gcnew array < Type^ > {"test",1};

 //parameters initializated in class constructor
 //IntPtr DLL_File = Native_Dll::LoadLibrary(Dll_Name);
 //IntPtr Init_Function = Native_Dll::GetProcAddress(DLL_File, "_McamGetNumberofCameras@0");

 DynamicMethod^ Function_Prototype = gcnew DynamicMethod("test", Return_Type, Types);

 //ArgumentException exception in this line
 Delegate^ Function_Delegate = Marshal::GetDelegateForFunctionPointer(Init_Function, Function_Prototype->GetType());

 Object^ Result = Function_Delegate->DynamicInvoke(Parameters);

 return Result;
}

有可能做我想做的事吗

还有其他方法吗

---

我也在寻找Func模板，但并不真正了解如何使用它。

我确实通过使用AssemblyBuilder制作动态包装解决了这个问题。 这是代码段

AssemblyName^ Delegate_Class_Name = gcnew AssemblyName("Dynamic_Class");

AssemblyBuilder^ Delegate_Class = AppDomain::CurrentDomain->DefineDynamicAssembly(Delegate_Class_Name, AssemblyBuilderAccess::RunAndSave);

ModuleBuilder^ Delegate_Class_Module = Delegate_Class->DefineDynamicModule(Delegate_Class_Name->Name, Delegate_Class_Name->Name + ".dll");

TypeBuilder^ Delegate_Class_Type = Delegate_Class_Module->DefineType("Dynamic_Class_Type", TypeAttributes::Public);

//a can add as much functions from native dll as a need
MethodBuilder^ Delegate_Function = Delegate_Class_Type->DefinePInvokeMethod(
        "_McamGetNumberofCameras@0",
        Dll_Name,
        MethodAttributes::Public | MethodAttributes::Static | MethodAttributes::PinvokeImpl,
        CallingConventions::Standard,
        long::typeid,
        Type::EmptyTypes,
        CallingConvention::Winapi,
        CharSet::Ansi);

Delegate_Function->SetImplementationFlags(Delegate_Function->GetMethodImplementationFlags() | MethodImplAttributes::PreserveSig);

Type^ Delegate_Type = Delegate_Class_Type->CreateType();

MethodInfo^ Delegate_Instace = Delegate_Type->GetMethod("_McamGetNumberofCameras@0");

//now i can just run it.
int result= (int) Delegate_Instace->Invoke(nullptr, nullptr);

---

这是不可能的，GetDelegateForFunctionPointer（）不支持泛型委托。您必须显式声明委托类型。那当然很痛苦。只要您使用LoadLibrary+GetProcAddress，最好使用[DllImport]来声明导出的函数。pinvoke marshaller免费为您提供一切，包括您试图编写的DynamicMethod管道。@Hans Passant说的“pinvoke marshaller”是指[DllImport]？就像这里的[DllImport（“kernel32.dll”）]静态IntPtr加载库（字符串^dll\u名称）；我可以直接在代码中使用LoadLibrary（“名称”）。

AssemblyName^ Delegate_Class_Name = gcnew AssemblyName("Dynamic_Class");

AssemblyBuilder^ Delegate_Class = AppDomain::CurrentDomain->DefineDynamicAssembly(Delegate_Class_Name, AssemblyBuilderAccess::RunAndSave);

ModuleBuilder^ Delegate_Class_Module = Delegate_Class->DefineDynamicModule(Delegate_Class_Name->Name, Delegate_Class_Name->Name + ".dll");

TypeBuilder^ Delegate_Class_Type = Delegate_Class_Module->DefineType("Dynamic_Class_Type", TypeAttributes::Public);

//a can add as much functions from native dll as a need
MethodBuilder^ Delegate_Function = Delegate_Class_Type->DefinePInvokeMethod(
        "_McamGetNumberofCameras@0",
        Dll_Name,
        MethodAttributes::Public | MethodAttributes::Static | MethodAttributes::PinvokeImpl,
        CallingConventions::Standard,
        long::typeid,
        Type::EmptyTypes,
        CallingConvention::Winapi,
        CharSet::Ansi);

Delegate_Function->SetImplementationFlags(Delegate_Function->GetMethodImplementationFlags() | MethodImplAttributes::PreserveSig);

Type^ Delegate_Type = Delegate_Class_Type->CreateType();

MethodInfo^ Delegate_Instace = Delegate_Type->GetMethod("_McamGetNumberofCameras@0");

//now i can just run it.
int result= (int) Delegate_Instace->Invoke(nullptr, nullptr);