JNA - Windows Query Processes

Question

I am trying to use JNA to return information about a specific Windows process. Not exactly how to do this. Could not find much on intercountry for help. Some information that I would like to return includes the use of CPU and memory. Below is an example that I found.

import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.DataInputStream; import java.io.FileInputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; import com.sun.jna.*; import com.sun.jna.Library.Handler; import com.sun.jna.platform.win32.*; import com.sun.jna.platform.win32.Advapi32Util.*; import com.sun.jna.platform.win32.WinNT.*; import com.sun.jna.ptr.IntByReference; import com.sun.jna.win32.*; import com.sun.jna.Native; import com.sun.jna.platform.win32.*; import com.sun.jna.win32.W32APIOptions; public class WindowsProcess { public static void main(String[] args) { WinNT winNT = (WinNT) Native.loadLibrary(WinNT.class, W32APIOptions.UNICODE_OPTIONS); WinNT.HANDLE snapshot = winNT.CreateToolhelp32Snapshot(Tlhelp32.TH32CS_SNAPPROCESS, new WinDef.DWORD(0)); Thelp32.PROCESSENTRY32.ByReference processEntry = new Tlhelp32.PROCESSENTRY32.ByReference(); while (winNT.Process32Next(snapshot, processEntry)) { System.out.println(processEntry.th32ProcessID + "\t" + Native.toString(processEntry.szExeFile)); } winNT.CloseHandle(snapshot); } } 

Answer 1

This works with JNA 3.5.0. I think an example that you have is not compatible with later versions of the library.

 import com.sun.jna.platform.win32.Kernel32; import com.sun.jna.platform.win32.Tlhelp32; import com.sun.jna.platform.win32.WinDef; import com.sun.jna.platform.win32.WinNT; import com.sun.jna.win32.W32APIOptions; import com.sun.jna.Native; public class ListProcesses { public static void main(String[] args) { Kernel32 kernel32 = (Kernel32) Native.loadLibrary(Kernel32.class, W32APIOptions.UNICODE_OPTIONS); Tlhelp32.PROCESSENTRY32.ByReference processEntry = new Tlhelp32.PROCESSENTRY32.ByReference(); WinNT.HANDLE snapshot = kernel32.CreateToolhelp32Snapshot(Tlhelp32.TH32CS_SNAPPROCESS, new WinDef.DWORD(0)); try { while (kernel32.Process32Next(snapshot, processEntry)) { System.out.println(processEntry.th32ProcessID + "\t" + Native.toString(processEntry.szExeFile)); } } finally { kernel32.CloseHandle(snapshot); } } } 

See also my answer elsewhere .