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c++ 编译dll 调用vissim

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C++ 简单的dll编译提供C#调用#

非托管DLL：非.NET环境下编译而成的dll，无法通过添加引用的方式加入程序
托管DLL：在.NET环境下编译成的dll

  • 会出现的问题
    编译方面，注意函数名一定要前要加 extern "C"，否则导出的dll函数名会有乱码符号导致调用时找不到函数入口

基本示例

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\\vissim.h
\\这是一个利用dll接入VISSIM的dll程序，包含了类，编写了几个函数接口来调用类
#ifdef VISSIMDLL_EXPORTS
#define VISSIMDLL_API extern "C" __declspec(dllexport)
#else
#define VISSIMDLL_API __declspec(dllimport)
#endif
 
//引入VISSIM的COM接口
#import "C:\Program Files (x86)\PTV_Vision\VISSIM430\Exe\vissim.exe"
using namespace VISSIM_COMSERVERLib;
 
// 此类是从 vissimdll.dll 导出的
class Cvissimdll {
private:
    ISimulationPtr _simulatiom;
    IVissimPtr _vissim;
public:
    Cvissimdll(void);
    ~Cvissimdll(void);
    void VissimInit();
    void VissimLoadNet(char*);
    void VissimRun();
};
 
VISSIMDLL_API void* VisClassInit(void **clsp);
 
VISSIMDLL_API void OpenVissim(Cvissimdll *p);
 
VISSIMDLL_API void LoadVissimNet(Cvissimdll *p,char* path);
 
VISSIMDLL_API void ProRun(Cvissimdll *p);
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//vissimdll.cpp
#include "stdafx.h"
#include "vissimdll.h"
 
Cvissimdll::Cvissimdll()
{
 
}
 
Cvissimdll::~Cvissimdll()
{
 
}
 
void Cvissimdll::VissimInit()
{       
    CoInitialize(NULL);
    _vissim.CreateInstance("Vissim.vissim");
    MessageBox(NULL,"调用vissim成功！","调用提示",MB_OK);
}
 
void Cvissimdll::VissimLoadNet(char* path)
{
    _vissim->LoadNet(path,false);
    MessageBox(NULL,"路网加载成功,运行仿真？","调用提示",MB_OKCANCEL);
}
 
void Cvissimdll::VissimRun()
{
    _vissim->Simulation->RunContinuous();
}
 
void* VisClassInit(void **clsp)
{
    Cvissimdll* p = new Cvissimdll();
    *clsp = p;
    return clsp;
}
 
void OpenVissim(Cvissimdll *p)
{
    p->VissimInit();
}
 
void LoadVissimNet(Cvissimdll *p,char* path)
{
    p->VissimLoadNet(path);
}
 
void ProRun(Cvissimdll *p)
{
    p->VissimRun();
}

C#的简单调用#

非托管dll的引用，在没有进行CLR的类封装编程时，只能调用dll中的函数，因此可以采用提供接口函数的方式来实现类的相关功能，如上面示例。采用的基本方法是P/invoke的方法调用。
首先需要添加引用using System.Runtime.InteropServices;

基本的调用方法参数

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[AttributeUsage(AttributeTargets.Method)]
public class DllImportAttribute: System.Attribute
{
public DllImportAttribute(string dllName) {…} //定位参数为dllName
public CallingConvention CallingConvention; //入口点调用约定
public CharSet CharSet;                                   //入口点采用的字符接
public string EntryPoint;  //入口点名称
public bool ExactSpelling;   //是否必须与指示的入口点拼写完全一致，默认false
public bool PreserveSig;  //方法的签名是被保留还是被转换
public bool SetLastError;  //FindLastError方法的返回值保存在这里
public string Value { get {…} }
}

调用示例

使用上面C++编译的dll来实现VISSIM的调用

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namespace vissimconn
{
    public partial class Form1 : Form
    {
        [DllImport(@"E:\code\C++\vissimdll\Debug\vissimdll.dll", EntryPoint = "VisClassInit", CallingConvention = CallingConvention.Cdecl)]
        extern static int VisClassinit(ref int clapoint);
        [DllImport(@"E:\code\C++\vissimdll\Debug\vissimdll.dll", EntryPoint = "OpenVissim", CallingConvention = CallingConvention.Cdecl)]
        extern static void Openvissim(ref int clapoint);
        [DllImport(@"E:\code\C++\vissimdll\Debug\vissimdll.dll", EntryPoint = "LoadVissimNet", CallingConvention = CallingConvention.Cdecl)]
        extern static void LoadNet(ref int clapoint, string path);
        [DllImport(@"E:\code\C++\vissimdll\Debug\vissimdll.dll", EntryPoint = "ProRun", CallingConvention = CallingConvention.Cdecl)]
        extern static void Run(ref int clapoint);
 
 
        private int _clspoint = 0;
        private string path = @"C:\Users\jr-zsf\Desktop\黄山4.3\vissim.inp";
        public Form1()
        {
            InitializeComponent();
            _clspoint = VisClassinit(ref _clspoint);
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            Openvissim(ref _clspoint);
            label1.Text = "接口函数加载成功！";
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            LoadNet(ref _clspoint, path);
            Run(ref _clspoint);
            label2.Text = "路网加载成功！";
        }
 
    }
}

最后补三张图
![启动VISSIM][1]
![加载路网][2]
![启动仿真][3]
[1]:http://flypigblog.oss-cn-beijing.aliyuncs.com/VISSIMC/1.PNG?x-oss-process=style/sy-highq
[2]:http://flypigblog.oss-cn-beijing.aliyuncs.com/VISSIMC/2.PNG?x-oss-process=style/sy-highq
[3]:http://flypigblog.oss-cn-beijing.aliyuncs.com/VISSIMC/3.PNG?x-oss-process=style/sy-highq