---jni simple implementation of Java Learning Article (cont.)

In the previous article, in the generation of the header file when there was a problem, fortunately Kung Fu, the ultimate difficulty was overcome!

Next I'm going to write step two of the 9th) step:

Step Two:

9) Set up the 64-bit compilation platform:

Open the Microsoft Visual stutio--->file--->new--->project ...--->

OK--->next--->

After finish, an empty project is generated:

The default is to use the Win32 platform, and my operating system is 64-bit, so:

Click Configuration Manager ...

The default is as follows:

New platform:

So far, the 64-bit compilation platform has been set up.

10) Implement the SayHello () method in C + + and compile the source file into a sayhello.dll dynamic-link library:

Copy the Dickens generated header file from the previous article to the SayHello project:

Select the header Files under the SayHello item---> Right-click Add--->existing item ...---> select com_ryze_jni_test_helloworld.h---> So the header file is added to the project:

Click can see the header file declared a long name called Java_com_ryze_jni_test_helloworld_sayhello function, the name of the function is Java_ Package Name _ Class Name _ Method name

The next step is to select the source Files under the project---> Right-click Add--->new item ...--->

Create a new C + + empty file with the name source

Write the code in the empty file as follows:

#include <iostream> #include "com_ryze_jni_test_helloworld.h" using namespace std; Jniexport void Jnicall Java_com_ryze_jni_test_helloworld_sayhello (jnienv *, jobject) {cout<< "Hello world!" <<endl;}

The header file is then opened and the header file

Rewritten as:

Then add the JDK's include directory

C:\Program Files\java\jdk1.7.0_45\include

Jni.h and directories under the

C:\Program Files\java\jdk1.7.0_45\include\win32

Under the Jni_md.h copy to the project source file directory

Then compile:

Compile successfully, at this time generate the Sayhello.dll file we need in the Debug directory:

11) Add the generated Sayhello.dll dynamic link library to the PATH environment variable:

12) Call the SayHello () method in the dynamic-link library in Java:

---jni simple implementation of Java Learning Article (cont.)