CallNtPowerInformation

[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:
CallNtPowerInfo rmation


NTSTATUS CallNtPowerInfo rmation(
POWER_INFORMATI ON_LEVEL InformationLeve l,
PVOID lpInputBuffer,
ULONG nInputBufferSiz e,
PVOID lpOutputBuffer,
ULONG nOutputBufferSi ze
);


By setting Informationleve l to SystemBatterySt ate, 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_informati on;
SYSTEM_BATTERY_ STATE sys_bat_state;


power_informati on = CallNtPowerInfo rmation(SystemB atteryState, NULL, 0,



&sys_bat_sta te, sizeof(sys_bat_ state));


printf("Battery Present: \n", sys_bat_state.B atteryPresent);
printf("Chargin g: \n", sys_bat_state.C harging);
printf("Dischar ging: \n", sys_bat_state.D ischarging);
printf("Maxcapa city: \n", sys_bat_state.M axCapacity);
printf("Remaini ngCapacity: \n", sys_bat_state.R emainingCapacit y);
printf("Rate: \n", sys_bat_state.R ate);


system("PAUSE") ;



}


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

Any ideas?


Thanks

[Bruno van Dooren [MVP VC++]]

Re: CallNtPowerInfo rmation

I have to write a simple program that will retrieve information about

the System Battery, So I was able to find this WinAPI function:
CallNtPowerInfo rmation

Hi.

Use the GetSystemPowerS tatus 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 CallNtPowerInfo rmation.
I suspect you would have gotten some clues from that.

--

Kind regards,
Bruno van Dooren
bruno_nos_pam_v an_dooren@hotma il.com
Remove only "_nos_pam"