unity 调用C++库（android+jni+window dll平台实现）_android jni调用dll

方便不知道如何再unity调用各平台动态库的同学参考，实测可用：

window案例

动态库名

tracker_model.dll

位置

unity工程 Assets\Plugins目录下

c# 关键调用

代码 

using UnityEngine;
using System.Collections;
using System.Runtime.InteropServices;
using System.Collections.Generic;

//[StructLayout(LayoutKind.Sequential)]
public struct Point3F {
 public float x;
 public float y;
 public float z;
}

public class Control : MonoBehaviour {

System.IntPtr center_data_prt;

System.IntPtr fingertips_data_prt;

[DllImport("tracker_model")]
 public static extern long points_init (string iin);

........

void Start () {
  handle = points_init(fileName);

...................

center_data_prt = Marshal. AllocHGlobal(Marshal.SizeOf(typeof(Point3F)));

fingertips_data_prt = Marshal. AllocHGlobal(Marshal.SizeOf(typeof(Point3F))*maxFingerTips);

tri_cnt = points_get_fingertips(handle, center_data_prt, fingertips_data_prt

}

 void Update () {

Point3F center = (Point3F)Marshal.PtrToStructure(
    (System.IntPtr)(center_data_prt.ToInt64()),typeof(Point3F));

for (int i = 0; i < tri_cnt; i++) {
    Point3F point = (Point3F)Marshal.PtrToStructure(
     (System.IntPtr)(fingertips_data_prt.ToInt64()+i*Marshal.SizeOf(typeof(Point3F))),typeof(Point3F));

}

}

void OnDestroy(){

Marshal.FreeHGlobal(center_data_prt);

Marshal.FreeHGlobal(fingertips_data_prt);

}

对应tracker_model.dll c++头文件接口

#ifndef _model_api_H_
#define _model_api_H_

#ifdef WIN32
#ifdef HTM_DLL_EXPORT
#define HTM_API extern "C" _declspec(dllexport)
#else
#define HTM_API extern "C"  _declspec(dllimport)
#endif
#else
#define HTM_API
#endif

struct Point3F
{
 float x;
 float y;
 float z;
};

HTM_API long points_init(const char *config_file);

HTM_API int  points_get_tri(long handle, Point3F* triangle_vertex_list, int list_len);

~~~~~~~

具体动态库编译过程不叙述

Android jni