JAVA調用C++遇到的坑

1、導入JNA包：

<dependency>
			<groupId>com.sun.jna</groupId>
			<artifactId>jna</artifactId>
			<version>3.0.9</version>
		</dependency>

2、寫一個接口CEnDeCheckLib繼承Library類，此接口中即可撰寫C++動態庫的方法。

3、使用下述方法加載動態庫的實例：libraryPath爲動態庫中.dll文件(windows平臺下的使用的動態庫文件)或.so（linux平臺下使用的動態庫文件）文件存儲的位置

CEnDeCheckLib instance = (CEnDeCheckLib) Native.loadLibrary(libraryPath, CEnDeCheckLib.class);

4、使用instance 調用動態庫的方法。

注意：調用動態庫傳參時有坑：

java中一般字符串類型設置爲String，當屬性無值時，默認爲null，如果把null傳給動態庫方法，idea運行項目會突然停止，且報出如下錯誤：

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007fff4371669a, pid=4432, tid=0x0000000000003a64
#
# JRE version: Java(TM) SE Runtime Environment (8.0_191-b12) (build 1.8.0_191-b12)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.191-b12 mixed mode windows-amd64 compressed oops)
# Problematic frame:
# C  [endecheck.dll+0x3669a]
#
# Failed to write core dump. Minidumps are not enabled by default on client versions of Windows
#
# An error report file with more information is saved as:
# E:\work\git\gis-lss-map-license-management-80003819\app-license-parent\hs_err_pid4432.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.

傳給動態庫方法的字符串參數如無值時，需傳入空的字符串""，不能傳入null，爲解決此問題，可將java的String屬性對應的默認值修改爲""，如

String result = ""