- 1 year ago
How can I prevent Windows OS from entering any energy saving mode while my Java application runs?
To prevent Windows OS from entering any energy-saving mode while your Java application runs, you can use the SetThreadExecutionState
function from the Windows API. This function allows you to inform the operating system that your application is still active and prevents the system from going into energy-saving modes.
To utilize this function from Java, you can use the Java Native Interface (JNI) to call the Windows API function. Here's an example of how you can accomplish this:
Create a new Java class, let's call it
EnergySavingPrevention
, and define the following native method:javapublic class EnergySavingPrevention {
static {
System.loadLibrary("EnergySavingPrevention");
}
public static native void preventEnergySaving();
}
Create a C/C++ source file, let's name it
EnergySavingPrevention.c
, to implement the native method:c#include <jni.h>
#include <Windows.h>
JNIEXPORT void JNICALL Java_EnergySavingPrevention_preventEnergySaving(JNIEnv* env, jclass cls) {
SetThreadExecutionState(ES_CONTINUOUS | ES_SYSTEM_REQUIRED);
}
Compile the C/C++ code to create a shared library. The exact steps depend on your development environment. Here's an example compilation command for Windows using GCC:
shellgcc -shared -o EnergySavingPrevention.dll -I"%JAVA_HOME%\include" -I"%JAVA_HOME%\include\win32" EnergySavingPrevention.c
Place the resulting
EnergySavingPrevention.dll
library in the same directory as your Java class (EnergySavingPrevention.class
).In your Java application, call the
preventEnergySaving()
method from theEnergySavingPrevention
class when your application starts or when you need to prevent energy-saving modes:javapublic class Main {
public static void main(String[] args) {
EnergySavingPrevention.preventEnergySaving();
// Your application logic here
}
}
By calling the preventEnergySaving()
method, the SetThreadExecutionState
function is invoked, which informs the operating system that your application is still active and prevents it from entering any energy-saving mode.
Note that this solution is specific to Windows OS. If you need to support other operating systems, you will need to implement platform-specific solutions for each of them.
Make sure to compile the C/C++ code using a compatible compiler for your Java runtime and adjust the compilation and library loading steps according to your specific development environment.