我的代码是从c ++ DLL读取的，其中我需要阅读的Coordinates属性之一是Vector3f的类型：
internal struct Entity
{
public IntPtr Info;
public IntPtr EntityModel;
public Vector3f Coordinates;
}
以下是我如何阅读它的示例：
var pAddressOfFunctionToCall = GetProcAddress(GetModuleHandle("Core.dll"), "GetTruckEntity");
var getEntity = (GetEntity)Marshal.GetDelegateForFunctionPointer(pAddressOfFunctionToCall, typeof(GetEntity));
var p = (Entity)Marshal.PtrToStructure(getEntity(), typeof(Entity));
Console.WriteLine(p.Coordinates.X);
Console.WriteLine(p.Coordinates.Y);
Console.WriteLine(p.Coordinates.Z);
结果始终为0，这是错误的，所以我假设我制作的类没有替代c ++使用的那个。
进一步研究DLL，Vector3f如下：
#ifndef VECTOR3_H
#define VECTOR3_H
#include <math.h>
#define Epsilon 0.00001f
#define EqualWithEpsilon(a,b) (((a) + Epsilon >= (b)) && ((a) - Epsilon <= (b)))
#define NullWithEpsilon(a) (((a) + Epsilon >= 0) && ((a) - Epsilon <= 0))
template <class T>
class Vector3
{
public: // interface
//! Default constructor (null vector).
Vector3() {m_Data[0] = m_Data[1] = m_Data[2] = (T)0;}
//! Constructor with three different values
Vector3(T nx, T ny, T nz) {m_Data[0] = nx; m_Data[1] = ny; m_Data[2] = nz;}
//! Constructor with the same value for all elements
explicit Vector3(T n) {m_Data[0] = m_Data[1] = m_Data[2] = n;}
//! Copy constructor
Vector3(const Vector3<T>& other) {m_Data[0] = other.X(); m_Data[1] = other.Y(); m_Data[2] = other.Z();}
//
// operators
// operator: indexing
const T& operator[] (int i) const { return m_Data[i]; }
T& operator[] (int i) { return m_Data[i]; }
// operators: math
Vector3<T> operator-() const { return Vector3<T>(-X(), -Y(), -Z()); }
Vector3<T>& operator=(const Vector3<T>& other) { X() = other.X(); Y() = other.Y(); Z() = other.Z(); return *this; }
Vector3<T> operator+(const Vector3<T>& other) const { return Vector3<T>(X() + other.X(), Y() + other.Y(), Z() + other.Z()); }
Vector3<T>& operator+=(const Vector3<T>& other) { X()+=other.X(); Y()+=other.Y(); Z()+=other.Z(); return *this; }
Vector3<T> operator+(const T val) const { return Vector3<T>(X() + val, Y() + val, Z() + val); }
Vector3<T>& operator+=(const T val) { X()+=val; Y()+=val; Z()+=val; return *this; }
Vector3<T> operator-(const Vector3<T>& other) const { return Vector3<T>(X() - other.X(), Y() - other.Y(), Z() - other.Z()); }
Vector3<T>& operator-=(const Vector3<T>& other) { X()-=other.X(); Y()-=other.Y(); Z()-=other.Z(); return *this; }
Vector3<T> operator-(const T val) const { return Vector3<T>(X() - val, Y() - val, Z() - val); }
Vector3<T>& operator-=(const T val) { X()-=val; Y()-=val; Z()-=val; return *this; }
Vector3<T> operator*(const Vector3<T>& other) const { return Vector3<T>(X() * other.X(), Y() * other.Y(), Z() * other.Z()); }
Vector3<T>& operator*=(const Vector3<T>& other) { X()*=other.X(); Y()*=other.Y(); Z()*=other.Z(); return *this; }
Vector3<T> operator*(const T v) const { return Vector3<T>(X() * v, Y() * v, Z() * v); }
Vector3<T>& operator*=(const T v) { X()*=v; Y()*=v; Z()*=v; return *this; }
Vector3<T> operator/(const Vector3<T>& other) const { return Vector3<T>(X() / other.X(), Y() / other.Y(), Z() / other.Z()); }
Vector3<T>& operator/=(const Vector3<T>& other) { X()/=other.X(); Y()/=other.Y(); Z()/=other.Z(); return *this; }
Vector3<T> operator/(const T v) const { T i=(T)1.0/v; return Vector3<T>(X() * i, Y() * i, Z() * i); }
Vector3<T>& operator/=(const T v) { T i=(T)1.0/v; X()*=i; Y()*=i; Z()*=i; return *this; }
// sort in order X, Y, Z. Equality with rounding tolerance.
bool operator<=(const Vector3<T>& other) const
{
return (X()<other.X() || EqualWithEpsilon(X(), other.X())) ||
(EqualWithEpsilon(X(), other.X()) && (Y()<other.Y() || EqualWithEpsilon(Y(), other.Y()))) ||
(EqualWithEpsilon(X(), other.X()) && EqualWithEpsilon(Y(), other.Y()) && (Z()<other.Z() || EqualWithEpsilon(Z(), other.Z())));
}
// sort in order X, Y, Z. Equality with rounding tolerance.
bool operator>=(const Vector3<T>&other) const
{
return (X()>other.X() || EqualWithEpsilon(X(), other.X())) ||
(EqualWithEpsilon(X(), other.X()) && (Y()>other.Y() || EqualWithEpsilon(Y(), other.Y()))) ||
(EqualWithEpsilon(X(), other.X()) && EqualWithEpsilon(Y(), other.Y()) && (Z()>other.Z() || EqualWithEpsilon(Z(), other.Z())));
}
// sort in order X, Y, Z. Difference must be above rounding tolerance.
bool operator<(const Vector3<T>&other) const
{
return (X()<other.X() && !EqualWithEpsilon(X(), other.X())) ||
(EqualWithEpsilon(X(), other.X()) && Y()<other.Y() && !EqualWithEpsilon(Y(), other.Y())) ||
(EqualWithEpsilon(X(), other.X()) && EqualWithEpsilon(Y(), other.Y()) && Z()<other.Z() && !EqualWithEpsilon(Z(), other.Z()));
}
// sort in order X, Y, Z. Difference must be above rounding tolerance.
bool operator>(const Vector3<T>&other) const
{
return (X()>other.X() && !EqualWithEpsilon(X(), other.X())) ||
(EqualWithEpsilon(X(), other.X()) && Y()>other.Y() && !EqualWithEpsilon(Y(), other.Y())) ||
(EqualWithEpsilon(X(), other.X()) && EqualWithEpsilon(Y(), other.Y()) && Z()>other.Z() && !EqualWithEpsilon(Z(), other.Z()));
}
// use weak float compare
bool operator==(const Vector3<T>& other) const
{
return this->equals(other);
}
bool operator!=(const Vector3<T>& other) const
{
return !this->equals(other);
}
// functions
//! returns if this vector equals the other one, taking floating point rounding errors into account
bool equals(const Vector3<T>& other) const
{
return EqualWithEpsilon(X(), other.X()) &&
EqualWithEpsilon(Y(), other.Y()) &&
EqualWithEpsilon(Z(), other.Z());
}
//
// named functions
// Set Value
void Set(T x, T y, T z);
// return length of vector
float GetLength() const;
// return length 2D of vector
float GetLength2() const;
// return length of vector squared
float GetSquareLength() const;
// return length 2D of vector squared
float GetSquareLength2() const;
// normalize a vector
void Normalize();
// perform dot product
T Dot(const Vector3<T>&) const;
// perform cross product(same as operator*=)
Vector3<T> Cross(const Vector3<T>&) const;
// accessor functions
T& X() { return m_Data[0]; }
const T& X() const { return m_Data[0]; }
T& Y() { return m_Data[1]; }
const T& Y() const { return m_Data[1]; }
T& Z() { return m_Data[2]; }
const T& Z() const { return m_Data[2]; }
const T* GetData() const { return m_Data; }
// static usefull methods
static const Vector3<T>& GetZero() {return ms_Zero;}
static const Vector3<T>& GetBaseI() {return ms_BaseI;}
static const Vector3<T>& GetBaseJ() {return ms_BaseJ;}
static const Vector3<T>& GetBaseK() {return ms_BaseK;}
private:
T m_Data[3];
// static usefull vectors
static Vector3<T> ms_Zero;
static Vector3<T> ms_BaseI;
static Vector3<T> ms_BaseJ;
static Vector3<T> ms_BaseK;
};
typedef Vector3<float> Vector3f;
template <class T> Vector3<T> Vector3<T>::ms_Zero = Vector3<T>((T)0);
template <class T> Vector3<T> Vector3<T>::ms_BaseI = Vector3<T>((T)1, (T)0, (T)0);
template <class T> Vector3<T> Vector3<T>::ms_BaseJ = Vector3<T>((T)0, (T)1, (T)0);
template <class T> Vector3<T> Vector3<T>::ms_BaseK = Vector3<T>((T)0, (T)0, (T)1);
template <class T> inline T
Vector3<T>::Dot(const Vector3<T>& v) const
{
return (T)(X() * v.X() + Y() * v.Y() + Z() * v.Z());
}
template <class T> inline Vector3<T>
Vector3<T>::Cross(const Vector3<T>& v) const
{
return Vector3<T> ( Y() * v.Z() - Z() * v.Y(),
-(X() * v.Z() - Z() * v.X()),
X() * v.Y() - Y() * v.X());
}
template <class T> inline void
Vector3<T>::Set(T x, T y, T z)
{
m_Data[0] = x;
m_Data[1] = y;
m_Data[2] = z;
}
template <class T> inline float
Vector3<T>::GetLength() const
{
return ::sqrt(GetSquareLength());
}
template <class T> inline float
Vector3<T>::GetSquareLength() const
{
return (X() * X() + Y() * Y() + Z() * Z());
}
template <class T> inline float
Vector3<T>::GetLength2() const
{
return ::sqrt(GetSquareLength2());
}
template <class T> inline float
Vector3<T>::GetSquareLength2() const
{
return (X() * X() + Y() * Y());
}
template <class T> inline void
Vector3<T>::Normalize()
{
float len = GetLength();
if (len != 0)
{
float f = 1.0f / len;
*this *= f;
}
}
#endif // VECTOR3_H
我试图写一个Vector3f的基本版本，只是在试图找回X，Y，Z：
public struct Vector3f
{
public Vector3f(float x, float y, float z)
{
X = x;
Y = y;
Z = z;
}
public float X;
public float Y;
public float Z;
}
但当然这似乎不起作用。
我环顾四周，但无法找到如何使其适用于具有类似类别的属性，我可以从中读取其他数据，但不能读取Vector3f。
答案 0 :(得分：2)
如果您决定使用C ++ / CLI解决方案，这可能会有所帮助。 我建议做的是：
第1点是微不足道的，对于第2点，您的C ++ / CLI代码应如下所示：
// Marshaler.h (in Marshaler.dll)
#include "OriginalVector3f.h"
#pragma once
using namespace System;
namespace UnmanagedNamespace {
using namespace ManagedNamespace::Common;
public ref class Marshaler
{
private:
public:
static Vector3f^ MarshalVector(IntPtr vectorPtr)
{
// Cast the IntPtr to the unmanaged pointer
Vector3* unmanaged = static_cast<Vector3*>(vectorPtr.ToPointer());
// Create a new managed object
Vector3f^ managed = gcnew Vector3f();
// Map info
managed->X = unmanaged->X;
managed->Y = unmanaged->Y;
managed->Z = unmanaged->Z;
return managed;
}
};
}
我在此假设以下内容：
对于第3点，您应该创建一个实现ICustomMarshaler的类，如图here所示，但为简单起见，首先手动调用MarshalVector方法。 例如：
ManagedNamespace.Common.Vector3f vector = UnmanagedNamespace.Marshaler.MarshalVector(Entity.Coordinates)
假设Entity.Coordinates是IntPtr。