SWIG - C++同C#的混合编程(二)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

/*
* 功能：演示C++对C#的回调
* 最后更新日期：2014-04-19
* 作者： Kagula
* 测试环境：Windows8.1 64bits, Visual Studio 2013 Update1, SWIG Win 3.0.0
* */
namespace SWIG_Tutorial3_CSharp
{
class Program
{
static void Main(string[] args)
{
//测试C++对C#代码的回调
Caller myCaller = new Caller();

// Test pure C++ class
using (Base myBase = new Base())
{
makeCalls(myCaller, myBase);//C++控制台输出
}

// Test director / C# derived class
using (Base myBase = new CSharpDerived())
{
makeCalls(myCaller, myBase);//C#控制台输出
}

//按任意键，退出应用程序
Console.ReadKey();
}

/* 设置回调对象，并回调 */
static void makeCalls(Caller myCaller, Base myBase)
{
myCaller.set(myBase);
myCaller.UIntMethodCall(123);
}
}

/* 测试对C++继承类的回调 */
public class CSharpDerived : Base
{
public override uint UIntMethod(uint x)
{
Console.WriteLine("CSharpDerived - UIntMethod({0})", x);
return x;
}
}
}

SWIG_Tutorial3.i文件清单

<pre name="code" class="plain">%module(directors="1") SWIG_Tutorial3 /* directors的设置是为了使SWIG支持回调 */%{/* 指定在当前文本中要引用到的头文件 */#include "Caller.h"%}%feature("director") Base; /* 设置Base, C++回调C#用的基类 *//* 解析头文件 */%include "Caller.h"

Caller.h

<pre name="code" class="cpp">#pragma once/*功能：演示C++对C#的回调机制作者：Kagula测试环境：Windows 8.1 64bits, Visual Studio 203 Update1, SWIG Win3.0.0参考资料：http://www.swig.org/Doc3.0/CSharp.html#CSharp_directors_example*/class Base {public:virtual unsigned int UIntMethod(unsigned int x);};class Caller {public:Caller() : m_base(nullptr) {}/* 不要释放从C#传进来的指针，这里遵循谁分配谁释放原则 */void set(Base *b) {m_base = b;}/* 回调测试 */unsigned int UIntMethodCall(unsigned int x){if (m_base == nullptr)return -1;return m_base->UIntMethod(x);//callback}private:Base *m_base;};

Caller.cpp

#include "Caller.h"#include <iostream>unsigned int Base::UIntMethod(unsigned int x) {std::cout << "Base - UIntMethod(" << x << ")" << std::endl;return x;}