托管代码中调用c++本地代码

c++本地动态连接库代码

 1 #pragma once
 2 #include "stdafx.h"
 3 
 4 #ifdef PERSON_EXPORTS
 5 #define PERSON_API __declspec(dllexport)
 6 #else
 7 #define PERSON_API __declspec(dllimport)
 8 #endif
 9 
10 class PERSON_API CPerson
11 {
12 public:
13     CPerson(LPCTSTR pszName, SYSTEMTIME birth);
14     unsigned int getAge(void);
15 
16 private:
17     TCHAR _name[256];
18     SYSTEMTIME _birth;
19 };
20 
21 #ifdef __cplusplus
22 extern "C"{
23 #endif
24     extern PERSON_API int nVal;
25     PERSON_API int nFunc(void);
26 #ifdef __cplusplus
27 }
28 #endif

Source

 1 // CPerson.cpp: 定义 DLL 应用程序的导出函数。
 2 //
 3 
 4 #include "stdafx.h"
 5 #include "CPerson.h"
 6 
 7 CPerson::CPerson(LPCTSTR pszName, SYSTEMTIME birth)
 8 {
 9     _birth = birth;
10     if (pszName != nullptr)
11         lstrcpy(_name, pszName);
12 }
13 
14 unsigned int CPerson::getAge(void)
15 {
16     SYSTEMTIME st;
17     GetSystemTime(&st);
18     UINT age = st.wYear - _birth.wYear;
19     if (_birth.wMonth > st.wMonth || 
20         (_birth.wMonth == st.wMonth && _birth.wDay > st.wDay))
21     {
22         --age;
23     }
24 
25     return age;
26 }
27 
28 PERSON_API int nVal = 20180403;
29 PERSON_API int nFunc(void)
30 {
31     return 1816;
32 }

View Code

c++/cli包装代码

 1 #pragma once
 2 #include "CPerson.h"
 3 
 4 using namespace System;
 5 
 6 namespace Adapter 
 7 {
 8     public ref class Person
 9     {
10     public:
11         Person(String ^name, DateTime birth);
12         virtual ~Person();
13 
14         property unsigned int Age
15         {
16             unsigned int get();
17         }
18 
19         static int CallnVal();
20         static int CallnFunc();
21         
22     private:
23         Person(): _person(nullptr) { }
24         CPerson *_person;
25     };
26 }

Source

 1 #include "stdafx.h"
 2 #include "Person.h"
 3 #include <vcclr.h>
 4 
 5 Adapter::Person::Person(String ^ name, DateTime birth)
 6 {
 7     SYSTEMTIME st = { 0 };
 8     st.wYear = birth.Year;
 9     st.wMonth = birth.Month;
10     st.wDay = birth.Day;
11 
12     pin_ptr<const TCHAR> psz = PtrToStringChars(name);
13 
14     _person = new CPerson(psz, st);
15 }
16 
17 Adapter::Person::~Person()
18 {
19     //System::Diagnostics::Debugger::Log(0, "Debug", "Person destructor.");
20     if (_person != nullptr)
21     {
22         CPerson *ptmp = _person;
23         _person = nullptr;
24         delete ptmp;
25     }
26 }
27 
28 int Adapter::Person::CallnVal()
29 {
30     return nVal;
31 }
32 
33 int Adapter::Person::CallnFunc()
34 {
35     return nFunc();
36 }
37 
38 unsigned int Adapter::Person::Age::get()
39 {
40     return _person->getAge();
41 }

View Code

经过验证使用Visual Studio 2017包含头文件<vcclr.h>会有报错，可以设置修改平台工具集来编译

通过CSharp调用

 1 using System;
 2 using Adapter;
 3 
 4 namespace ConsoleApp
 5 {
 6     class Program
 7     {
 8         static void Main(string[] args)
 9         {
10             DateTime dt = DateTime.Now;
11             dt = dt.AddYears(-50);
12             Person p1 = new Person("c++", dt);
13             Console.WriteLine("调用本地c++ dll中的类: " + p1.Age);
14             Console.WriteLine("调用本地c++ dll中的变量： " + Person.CallnVal());
15             Console.WriteLine("调用本地c++ dll中的函数: " + Person.CallnFunc());
16 
17             Console.ReadLine();
18         }
19     }
20 }

参考资料详情：

　　https://www.codeproject.com/Articles/35041/Mixing-NET-and-native-code

　　https://blog.csdn.net/ganzheyu/article/details/50154705

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原文地址：https://www.cnblogs.com/linxmouse/p/8710671.html