i2p.firefox/java/net/i2p/router/Elevator.java

package net.i2p.router;

import com.sun.jna.WString;
import com.sun.jna.platform.win32.Kernel32;
import com.sun.jna.platform.win32.Kernel32Util;

public class Elevator {
  public static void main(String... args) {
    executeAsAdministrator("c:\\windows\\system32\\notepad.exe", "");
  }

  public static void executeAsAdministrator(String command, String args) {
    if (command == "" || command == null) {
      System.out.println("No command specified");
      return;
    }
    Shell32X.SHELLEXECUTEINFO execInfo = new Shell32X.SHELLEXECUTEINFO();
    execInfo.lpFile = new WString(command);
    if (args != null)
      execInfo.lpParameters = new WString(args);
    execInfo.nShow = Shell32X.SW_SHOWDEFAULT;
    execInfo.fMask = Shell32X.SEE_MASK_NOCLOSEPROCESS;
    execInfo.lpVerb = new WString("runas");
    boolean result = Shell32X.INSTANCE.ShellExecuteEx(execInfo);

    if (!result) {
      int lastError = Kernel32.INSTANCE.GetLastError();
      String errorMessage =
          Kernel32Util.formatMessageFromLastErrorCode(lastError);
      throw new RuntimeException("Error performing elevation: " + lastError +
                                 ": " + errorMessage +
                                 " (apperror=" + execInfo.hInstApp + ")");
    }
  }
}