CallNtPowerInformation

  • Thread starter Thread starter HK
  • Start date Start date
H

HK

Hi all,

I have to write a simple program that will retrieve information about
the System Battery, So I was able to find this WinAPI function:
CallNtPowerInformation


NTSTATUS CallNtPowerInformation(
POWER_INFORMATION_LEVEL InformationLevel,
PVOID lpInputBuffer,
ULONG nInputBufferSize,
PVOID lpOutputBuffer,
ULONG nOutputBufferSize
);


By setting Informationlevel to SystemBatteryState, The lpOutputBuffer
buffer receives a SYSTEM_BATTERY_STATE structure containing information



about the current system battery.


I was to compile the program and link it successfully; however when i
output all the members of the SYSTEM_BATTERY_STATE structure I am not
getting anything. Here is
the code:


#include <windows.h>
#include <powrprof.h>
#include <WinDef.h>


void main()
{
NTSTATUS power_information;
SYSTEM_BATTERY_STATE sys_bat_state;


power_information = CallNtPowerInformation(SystemBatteryState, NULL, 0,



&sys_bat_state, sizeof(sys_bat_state));


printf("BatteryPresent: \n", sys_bat_state.BatteryPresent);
printf("Charging: \n", sys_bat_state.Charging);
printf("Discharging: \n", sys_bat_state.Discharging);
printf("Maxcapacity: \n", sys_bat_state.MaxCapacity);
printf("RemainingCapacity: \n", sys_bat_state.RemainingCapacity);
printf("Rate: \n", sys_bat_state.Rate);


system("PAUSE");



}


I did add the libpowrprof.a already and the program is linking
successfully.

Any ideas?


Thanks
 
I have to write a simple program that will retrieve information about
the System Battery, So I was able to find this WinAPI function:
CallNtPowerInformation
Click to expand...

Hi.

Use the GetSystemPowerStatus function instead. It will retrieve all power
information directly into a structure.
It is very easy to use.
Btw, you did not check the return value of CallNtPowerInformation.
I suspect you would have gotten some clues from that.

--

Kind regards,
Bruno van Dooren
(e-mail address removed)
Remove only "_nos_pam"
 
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