//================================================= file = getBattery.c =====
//=  Program to get remaining battery life (percent) of a Windows laptop    =
//===========================================================================
//=  Notes:                                                                 =
//=   1) See http://msdn.microsoft.com/en-us/library/aa372693(v=VS.85).aspx =
//=-------------------------------------------------------------------------=
//=  Build: bcc32 getBattery.c                                              =
//=-------------------------------------------------------------------------=
//=  Execute: getBattery                                                    =
//=-------------------------------------------------------------------------=
//=  Author: Ken Christensen                                                =
//=          University of South Florida                                    =
//=          WWW: http://www.csee.usf.edu/~christen                         =
//=          Email: christen@csee.usf.edu                                   =
//=-------------------------------------------------------------------------=
//=  History: KJC (01/01/11) - Genesis                                      =
//===========================================================================

//----- Include files -------------------------------------------------------
#include <stdio.h>        // Needed for printf()
#include <windows.h>      // Needed for Windows stuff

//===========================================================================
//=  Main program                                                           =
//===========================================================================
int main()
{
  SYSTEM_POWER_STATUS *powerStruc;    // Windows structure
  int flag;                           // Flag for successful command
  int percentLeft;                    // Battery percent left

  // Create space for powerStruc
  powerStruc = malloc(sizeof(SYSTEM_POWER_STATUS));

  // Issue the Get command
  flag = GetSystemPowerStatus(powerStruc);
  printf("Return flag = %d \n", flag);

  // Grap the batter life left and output it
  percentLeft = powerStruc->BatteryLifePercent;
  printf("Battery percent left = %d %% \n", percentLeft);

  return(0);
}