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, a method for getting the Windows platform id and a method for clearing the screen.

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 the screen will be cleared and I can see the following output:

Win32 on Windows NT/Windows 2000
C:\WINDOWS