Shulou(Shulou.com)06/01 Report--

This article will explain in detail how Java calls C++ programs. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

1. Write Java program: HelloWorld

The code is as follows:

Package HelloWorld;public class HelloWorld {public native void sayHello (); public static void main (String [] args) {System.loadLibrary ("Win32Project1"); HelloWorld tNative = new HelloWorld (); tNative.sayHello ();} 2. Under the Windows environment, compile the above program in cmd

After the compilation is completed, use the javah-jni HelloWorld.HelloWorld command to generate the HelloWorld_HelloWorld.h file under the src folder. (note that the two HelloWorld I wrote here, the former one refers to the package name and the latter refers to the class name, because I am written in eclipse, so I need to write down the package name and class name, so that I will not report an error when compiling and running in cmd.

After performing this step, you can see that the three files HelloWorld.java, HelloWorld.class, and HelloWorld_HelloWorld.h are located in the same src folder, as shown in the following figure (note that the src folder here is automatically generated when the java project HelloWorld is created in eclipse, not manually):

3. Write C++ program

Open Visual Studio 2013 and execute File-> New-> Project-> Visual projects-> Win32 Project-> OK-> next-> Select DLL (D)-> finish.

Notice that you set the project name and the location of the project file, as shown in the red icon below:

After you have created the project, add the previously generated HelloWorld_HelloWorld.h header file to the project header file, and add the helloworld.cpp file to the source file, as shown in the following figure:

Next, enter the following code in the helloworld.cpp file:

/ / helloworld.cpp: defines the export function of the DLL application. / / # include "stdafx.h" # include "HelloWorld_HelloWorld.h" # includeusing namespace std;JNIEXPORT void JNICALL Java_HelloWorld_HelloWorld_sayHello (JNIEnv *, jobject) {cout

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