JNI with SDK 1.4

With SDK 1.4 it is not possible to get environment variables with System.getenv(String name), because this method is deprecated. This DLL implements the getenv method again and a method for getting the Windows platform id.

To create your own JNI project with SDK 1.4 and .DOT, first write the java class, compile it and create the JNI-header:

• javac de\frankbuss\jni\WinAccess.java
• javah de.frankbuss.jni.WinAccess

Then start the .NET-IDE and create a new project:

• New Project->Win32 Project
• Win32 Application Wizard->Application Settings: DLL
• Configuration-Properties -> C/C++ -> General -> Additional Include Directory: C:\j2sdk\include;C:\j2sdk\include\win32
• Configuration-Properties -> Linker -> General -> Additional Library Directories: C:\j2sdk\lib
• Configuration-Properties -> Linker -> Input -> Additional Dependencies: jvm.lib
• optional: Configuration-Properties -> All Configuration -> C/C++ -> Precompiled Headers -> Create/Use Precompiled Header: Not Using Precompiled Headers
• copy the native function prototypes to your cpp-file and implement the functions

Here's the example for getting the environment values and the platform name:

• de.frankbuss.jni.WinAccess.java
• WinAccess.dll
• jni.cpp
• de_frankbuss_jni_WinAccess.h

Full project, with .NET project files: jni.zip

For starting the test enter in a DOS-box:

On my Windows XP system I can see the following output:

Win32 on Windows NT/Windows 2000
C:\WINDOWS