C#•2y ago

Need some help with marshal

im using GetFunctionPointerForDelegate with CreateDelegate , so i can get a pointer to the method in my project, it worked for one thing, but for another thing rn it doesnt work and it outputs an error, ArgumentException The d parameter is a generic type definition. im not really sure what that means, any help?

4 Replies

WhiteBlackGoose•2y ago

Would you please give a snippet of code with this problem?

Miya•2y ago

here

 void* functionPointer = (void*)Marshal.GetFunctionPointerForDelegate(CreateDelegate(theCSFunction,0));

 void* functionPointer = (void*)Marshal.GetFunctionPointerForDelegate(CreateDelegate(theCSFunction,0));

where createdelegate is

  public static Delegate CreateDelegate(this MethodInfo methodInfo, object target) {
            Func<Type[], Type> getType;
            var isAction = methodInfo.ReturnType.Equals((typeof(void)));
            var types = methodInfo.GetParameters().Select(p => p.ParameterType);
            if (isAction) {
                getType = Expression.GetActionType;
            }
            else {
                getType = Expression.GetFuncType;
                types = types.Concat(new[] { methodInfo.ReturnType });
            }
            if (methodInfo.IsStatic) {
                return Delegate.CreateDelegate(getType(types.ToArray()), methodInfo);
            }
            return Delegate.CreateDelegate(getType(types.ToArray()), target, methodInfo.Name);
        }

  public static Delegate CreateDelegate(this MethodInfo methodInfo, object target) {
            Func<Type[], Type> getType;
            var isAction = methodInfo.ReturnType.Equals((typeof(void)));
            var types = methodInfo.GetParameters().Select(p => p.ParameterType);
            if (isAction) {
                getType = Expression.GetActionType;
            }
            else {
                getType = Expression.GetFuncType;
                types = types.Concat(new[] { methodInfo.ReturnType });
            }
            if (methodInfo.IsStatic) {
                return Delegate.CreateDelegate(getType(types.ToArray()), methodInfo);
            }
            return Delegate.CreateDelegate(getType(types.ToArray()), target, methodInfo.Name);
        }

^ this seems to happen with any function that has more than 0 arguments

Miya•2y ago

trought debuggin i can see the function is made properly

Miya•2y ago

so its the GetFunctionPointerForDelegate throwing an error oh ,i think i know what happens it probably means that the type of the delegate needs to be not a generic why so? thats quite a strange restriction Thx for help I guess

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Need some help with marshal