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battstatus.cpp
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battstatus.cpp
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/* battstatus - Monitor the Windows battery status for changes in state
Sample output:
[Wed Aug 02 12:15:55 PM]: 5 hr 30 min (99%) remaining
[Wed Aug 02 12:17:38 PM]: WM_POWERBROADCAST: PBT_APMPOWERSTATUSCHANGE
[Wed Aug 02 12:17:38 PM]: 99% available (plugged in, not charging)
[Wed Aug 02 12:17:44 PM]: Fully charged (100%)
[Wed Aug 02 12:41:50 PM]: WM_POWERBROADCAST: PBT_APMPOWERSTATUSCHANGE
[Wed Aug 02 12:41:50 PM]: 99% remaining
[Wed Aug 02 12:45:14 PM]: 8 hr 13 min (98%) remaining
[Wed Aug 02 12:49:39 PM]: 7 hr 37 min (97%) remaining
It can optionally show verbose information and prevent sleep. Use option --help
to see the usage information.
To build using Visual Studio 2008 (with TR1 support) or later:
cl /W4 /wd4127 /wd4530 battstatus.cpp user32.lib powrprof.lib setupapi.lib
To build using MinGW or MinGW-w64:
g++ -Wall -std=gnu++11 -o battstatus battstatus.cpp -lpowrprof -lsetupapi -luuid
https://github.com/jay/battstatus
*//*
Copyright (C) 2017 Jay Satiro <raysatiro@yahoo.com>
All rights reserved.
This file is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This file is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
<https://www.gnu.org/licenses/#GPL>
*/
#define _WIN32_WINNT 0x0501
#ifndef _CRT_SECURE_NO_WARNINGS
#define _CRT_SECURE_NO_WARNINGS
#endif
#define WIN32_NO_STATUS
#include <windows.h>
#undef WIN32_NO_STATUS
#ifdef __MINGW32__
#include <_mingw.h>
#ifdef __MINGW64_VERSION_MAJOR
#include <batclass.h>
#include <ntstatus.h>
#else
#include <ddk/batclass.h>
#include <ddk/ntddk.h>
#endif
#else
#include <batclass.h>
#include <ntstatus.h>
#endif
#include <devguid.h>
#include <powrprof.h>
#include <setupapi.h>
#include <assert.h>
#include <limits.h>
#include <stdio.h>
#include <time.h>
#include <deque>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <string>
#include <type_traits>
#include <vector>
#ifndef ES_AWAYMODE_REQUIRED
#define ES_AWAYMODE_REQUIRED ((DWORD)0x00000040)
#endif
#ifndef PBTF_APMRESUMEFROMFAILURE
#define PBTF_APMRESUMEFROMFAILURE 0x00000001
#endif
#ifndef PBT_POWERSETTINGCHANGE
#define PBT_POWERSETTINGCHANGE 0x8013
#endif
#ifndef SPSF_BATTERYCHARGING
#define SPSF_BATTERYCHARGING 8
#endif
#ifndef SPSF_BATTERYNOBATTERY
#define SPSF_BATTERYNOBATTERY 128
#endif
/* The battery saver status is available since Windows 10. It's stored in
member SystemStatusFlag but older headers use the name Reserved1. */
#if defined(__MINGW64_VERSION_MAJOR) || \
!defined(SYSTEM_STATUS_FLAG_POWER_SAVING_ON)
#define SystemStatusFlag Reserved1
#endif
#ifndef SYSTEM_STATUS_FLAG_POWER_SAVING_ON
#define SYSTEM_STATUS_FLAG_POWER_SAVING_ON 1
#endif
// Bool macros for SYSTEM_POWER_STATUS
#define BATTSAVER(status) \
((status).SystemStatusFlag == SYSTEM_STATUS_FLAG_POWER_SAVING_ON)
#define CHARGING(status) (!!((status).BatteryFlag & SPSF_BATTERYCHARGING))
#define NO_BATTERY(status) (!!((status).BatteryFlag & SPSF_BATTERYNOBATTERY))
#define PLUGGED_IN(status) ((status).ACLineStatus == 1)
/* Sample output at field width 22:
ACLineStatus: Offline
BatteryFlag: Low
BatteryLifePercent: 17%
BatteryLifeTime: 42 min
BatteryFullLifeTime: Unknown
Battery discharge: -11433mW
*/
#define BATT_FIELD_WIDTH 22
using namespace std;
/* In Visual Studio 2008 we need the TR1 functions in std::tr1, which is only
available if its optional feature pack or SP1 is installed. */
#if _MSC_VER == 1500
using namespace std::tr1;
#endif
// Command line options, refer to ShowUsage
unsigned lifetime_span_minutes;
bool monitor = true;
bool prevent_sleep;
bool console_title;
unsigned verbose;
RTL_OSVERSIONINFOW os;
/* There are certain times when the battery charge state should be suppressed,
such as when it continually changes in a short period of time and verbose
mode is disabled. */
bool suppress_charge_state;
/* There are certain times when the battery lifetime should be suppressed, such
as when the computer just woke up. */
bool suppress_lifetime;
/* There are certain times when SYSTEM_POWER_STATUS error messages should be
suppressed, such as when GetSystemPowerStatus fails continuously. */
bool suppress_sps_errmsgs;
/* time as local time string in format: Tue May 16 03:24:31 PM */
string TimeToLocalTimeStr(time_t t)
{
char buf[100];
/* localtime is thread-safe in Windows but the per-thread structure that's
returned is shared by gmtime, mktime, mkgmtime. */
struct tm *lt = localtime(&t);
// old format: "%Y-%m-%d %H:%M:%S" 2017-05-16 15:10:08
if(!lt || !strftime(buf, sizeof buf, "%a %b %d %I:%M:%S %p", lt))
return "Unknown time";
return buf;
}
/* The timestamp style in verbose mode:
--- Sun May 28 07:00:55 PM ---
text
*/
#define TIMESTAMPED_HEADER \
"\n--- " << TimeToLocalTimeStr(time(NULL)).c_str() << " ---\n"
/* The timestamp style in default mode: [Sun May 28 07:00:27 PM]: text */
#define TIMESTAMPED_PREFIX \
"[" << TimeToLocalTimeStr(time(NULL)).c_str() << "]: "
template <typename T>
string UndocumentedValueStr(T undocumented_value)
{
stringstream ss;
ss << "Undocumented value: " << undocumented_value;
if(is_arithmetic<T>::value)
ss << " (hex: " << hex << undocumented_value << ")";
return ss.str();
}
string UndocumentedValueStr(char undocumented_value)
{
// can't use conditional class here since VS2008 doesn't have it
if(is_signed<char>::value)
return UndocumentedValueStr<signed>(undocumented_value);
else
return UndocumentedValueStr<unsigned>(undocumented_value);
}
string UndocumentedValueStr(unsigned char undocumented_value)
{
return UndocumentedValueStr<unsigned>(undocumented_value);
}
string UndocumentedValueStr(signed char undocumented_value)
{
return UndocumentedValueStr<signed>(undocumented_value);
}
/* Relative capacity and rate:
According to BATTERY_INFORMATION documentation the capacity and rate
information reported by a battery may be relative, with all rate information
reported in units per hour.
"If [flag BATTERY_CAPACITY_RELATIVE] is set, all references to units in
the other battery documentation can be ignored."
That flag is set per battery, however most of this program looks at overall
battery use in structures where that information is not available, so in
those cases we treat it as unknown.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa372661.aspx */
enum CapacityType
{
CAPACITY_TYPE_UNKNOWN,
CAPACITY_TYPE_RELATIVE,
CAPACITY_TYPE_MILLIWATT_HOUR
};
enum RateType
{
RATE_TYPE_UNKNOWN,
RATE_TYPE_RELATIVE,
RATE_TYPE_MILLIWATT
};
string CapacityStr(DWORD unit, enum CapacityType ct = CAPACITY_TYPE_UNKNOWN)
{
stringstream ss;
ss << unit;
if(ct == CAPACITY_TYPE_RELATIVE)
ss << " (relative)";
else if(ct == CAPACITY_TYPE_MILLIWATT_HOUR)
ss << "mWh";
else
ss << "mWh (or relative)";
return ss.str();
}
string RateStr(DWORD unit, enum RateType rt = RATE_TYPE_UNKNOWN)
{
stringstream ss;
if(rt == RATE_TYPE_RELATIVE)
ss << unit << " (relative)";
else {
/* Rate as described by SYSTEM_BATTERY_STATE (other rates may differ):
"The current rate of discharge of the battery, in mW. A nonzero,
positive rate indicates charging; a negative rate indicates discharging.
Some batteries report only discharging rates. This value should be
treated as a LONG as it can contain negative values (with the high bit
set)."
However when some of my batteries charge the Rate is:
0x80000000 == -2147483648 (LONG) == 2147483648 (DWORD)
When my batteries are removed the Rate is 0. */
if(unit == 0 || unit == 0x80000000)
return "Unknown";
ss << showpos << (LONG)unit;
if(rt == RATE_TYPE_MILLIWATT)
ss << "mW";
else
ss << "mW (or relative)";
}
return ss.str();
}
string RateStr(LONG Rate, enum RateType rt = RATE_TYPE_UNKNOWN)
{
return RateStr((DWORD)Rate, rt);
}
string CapabilitiesStr(ULONG Capabilities)
{
if(Capabilities == 0)
return "<none>";
stringstream ss;
#define EXTRACT_CAPABILITIES(flag) \
if((Capabilities & flag)) { \
if(ss.tellp() > 0) \
ss << " | "; \
ss << #flag; \
Capabilities &= ~flag; \
}
EXTRACT_CAPABILITIES(BATTERY_CAPACITY_RELATIVE);
EXTRACT_CAPABILITIES(BATTERY_IS_SHORT_TERM);
EXTRACT_CAPABILITIES(BATTERY_SET_CHARGE_SUPPORTED);
EXTRACT_CAPABILITIES(BATTERY_SET_DISCHARGE_SUPPORTED);
EXTRACT_CAPABILITIES(BATTERY_SYSTEM_BATTERY);
if(Capabilities) {
if(ss.tellp() > 0)
ss << " | ";
ss << UndocumentedValueStr(Capabilities);
}
return ss.str();
}
string TechnologyStr(UCHAR Technology)
{
switch(Technology)
{
case 0: return "Nonrechargeable";
case 1: return "Rechargeable";
}
return UndocumentedValueStr(Technology);
}
string ChemistryStr(const UCHAR Chemistry[4])
{
/* Chemistry is "not necessarily zero-terminated" */
int i;
for(i = 0; i < 4; ++i) {
if(Chemistry[i] == '\0')
break;
}
return string((const char *)Chemistry, i);
}
string DesignedCapacityStr(ULONG DesignedCapacity,
enum CapacityType ct = CAPACITY_TYPE_UNKNOWN)
{
return CapacityStr(DesignedCapacity, ct);
}
string FullChargedCapacityStr(ULONG FullChargedCapacity,
enum CapacityType ct = CAPACITY_TYPE_UNKNOWN)
{
return CapacityStr(FullChargedCapacity, ct);
}
/* DefaultAlert1:
"The manufacturer's suggestion of a capacity, in mWh, at which a low battery
alert should occur."
*/
string DefaultAlert1Str(DWORD DefaultAlert1,
enum CapacityType ct = CAPACITY_TYPE_UNKNOWN)
{
return CapacityStr(DefaultAlert1, ct);
}
/* DefaultAlert2:
"The manufacturer's suggestion of a capacity, in mWh, at which a warning
battery alert should occur."
*/
string DefaultAlert2Str(DWORD DefaultAlert2,
enum CapacityType ct = CAPACITY_TYPE_UNKNOWN)
{
return CapacityStr(DefaultAlert2, ct);
}
string CriticalBiasStr(ULONG CriticalBias,
enum CapacityType ct = CAPACITY_TYPE_UNKNOWN)
{
return CapacityStr(CriticalBias, ct);
}
string CycleCountStr(ULONG CycleCount)
{
stringstream ss;
ss << CycleCount;
return ss.str();
}
string BatteryInformationStr(const BATTERY_INFORMATION *bi)
{
stringstream ss;
enum CapacityType ct = ((bi->Capabilities & BATTERY_CAPACITY_RELATIVE) ?
CAPACITY_TYPE_RELATIVE :
CAPACITY_TYPE_MILLIWATT_HOUR);
#define BATTINFO_PRELUDE(item) \
ss << left << setw(BATT_FIELD_WIDTH) << #item ": " << right;
#define SHOW_BATTINFO(item) \
BATTINFO_PRELUDE(item); \
ss << item##Str(bi->item) << "\n";
#define SHOW_BATTINFO_CAPACITY_MEMBER(item) \
BATTINFO_PRELUDE(item); \
ss << item##Str(bi->item, ct) << "\n";
SHOW_BATTINFO(Capabilities);
SHOW_BATTINFO(Technology);
SHOW_BATTINFO(Chemistry);
SHOW_BATTINFO_CAPACITY_MEMBER(DesignedCapacity);
SHOW_BATTINFO_CAPACITY_MEMBER(FullChargedCapacity);
SHOW_BATTINFO_CAPACITY_MEMBER(DefaultAlert1);
SHOW_BATTINFO_CAPACITY_MEMBER(DefaultAlert2);
SHOW_BATTINFO_CAPACITY_MEMBER(CriticalBias);
SHOW_BATTINFO(CycleCount);
return ss.str();
}
void ShowBatteryInformation(const BATTERY_INFORMATION *bi)
{
cout << BatteryInformationStr(bi) << flush;
}
string ManufactureDateStr(BATTERY_MANUFACTURE_DATE *mnfctr_date)
{
stringstream ss;
if(!mnfctr_date->Year)
return "Unknown";
ss.fill('0');
ss << setw(4) << (unsigned)mnfctr_date->Year << "-"
<< setw(2) << (unsigned)mnfctr_date->Month << "-"
<< setw(2) << (unsigned)mnfctr_date->Day;
return ss.str();
}
// this is the input for EnumBattInterfacesProc
struct device {
/* slot always has a valid number. Any other member may be valid. */
unsigned slot; // battery interface number (starts at 0, sequential)
HANDLE handle; // battery interface handle (invalid: INVALID_HANDLE_VALUE)
wchar_t *path; // battery interface path
};
/* this is the output for EnumBattInterfacesProc
MSDN says battery tags are not unique between battery device interfaces
(slots), therefore more than one slot may have a battery with the same tag.
Furthermore the tag may change even if the battery hasn't, and when that
happens "all cached data should be re-read".
To see if the same physical battery is present compare unique_id, not tag.
https://msdn.microsoft.com/en-us/library/windows/desktop/aa372659.aspx
*/
struct battery {
/* 'success' signifies that all requested information was obtained from the
battery. Unless otherwise noted any member may be valid even if success is
false. To determine if a battery is present in the slot check if
tag != BATTERY_TAG_INVALID. */
bool success;
ULONG tag; // battery tag (invalid: BATTERY_TAG_INVALID)
wchar_t *unique_id; // string that uniquely identifies the battery
wchar_t *path; // battery interface path
// battery manufacture date (unknown: 0000-00-00)
BATTERY_MANUFACTURE_DATE mnfctr_date;
BATTERY_INFORMATION info; // battery info (invalid: success is false)
double health; // percentage of full capacity vs design capacity
};
typedef BOOL (CALLBACK* BATTINTENUMPROC)(const struct device *device,
void *cbdata);
/* Get battery info for each battery.
Pass a pointer to an _empty_ vector<battery> as cbdata.
This is called by EnumBattInterfaces once for each battery interface without
skipping any inaccessible devices, starting at 0 until the last interface.
After this function returns the device resources are freed. If you'll need to
reopen the battery interface later, make a copy of the path.
TRUE: Continue on to the next interface.
FALSE: Stop enumerating interfaces; do not call this function again.
*/
BOOL CALLBACK EnumBattInterfacesProc(const struct device *device,
void *cbdata)
{
DWORD bytes_written;
vector<battery> *batteries = (vector<battery> *)cbdata;
batteries->push_back(battery());
struct battery *battery = &batteries->back();
battery->tag = BATTERY_TAG_INVALID;
if(!device->path || device->handle == INVALID_HANDLE_VALUE)
return TRUE; // interface inaccessible, continue on
battery->path = _wcsdup(device->path);
if(!battery->path) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
// How long to wait for the interface to return a battery tag
ULONG wait = 0;
if(!DeviceIoControl(device->handle, IOCTL_BATTERY_QUERY_TAG,
&wait, sizeof(wait),
&battery->tag, sizeof(battery->tag),
&bytes_written, NULL)) {
return TRUE; // battery not found, continue on
}
BATTERY_QUERY_INFORMATION bqi = { battery->tag };
bqi.InformationLevel = BatteryUniqueID;
wchar_t buffer[1024];
if(!DeviceIoControl(device->handle, IOCTL_BATTERY_QUERY_INFORMATION,
&bqi, sizeof(bqi),
buffer, sizeof(buffer),
&bytes_written, NULL)) {
return TRUE; // unique id string not found or too long, continue on
}
battery->unique_id = _wcsdup(buffer);
if(!battery->unique_id) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
bqi.InformationLevel = BatteryManufactureDate;
if(!DeviceIoControl(device->handle, IOCTL_BATTERY_QUERY_INFORMATION,
&bqi, sizeof(bqi),
&battery->mnfctr_date, sizeof(battery->mnfctr_date),
&bytes_written, NULL)) {
// assume manufacture date unknown (0000-00-00)
memset(&battery->mnfctr_date, 0, sizeof battery->mnfctr_date);
}
bqi.InformationLevel = BatteryInformation;
if(!DeviceIoControl(device->handle, IOCTL_BATTERY_QUERY_INFORMATION,
&bqi, sizeof(bqi),
&battery->info, sizeof(battery->info),
&bytes_written, NULL)) {
memset(&battery->info, 0, sizeof battery->info);
return TRUE; // battery info isn't accessible, continue on
}
if(!battery->info.FullChargedCapacity ||
battery->info.FullChargedCapacity == (ULONG)-1)
battery->health = 0;
else if(!battery->info.DesignedCapacity ||
battery->info.DesignedCapacity == (ULONG)-1 ||
battery->info.FullChargedCapacity >= battery->info.DesignedCapacity)
battery->health = 100;
else {
battery->health = 100 * ((double)battery->info.FullChargedCapacity /
battery->info.DesignedCapacity);
}
battery->success = true;
return TRUE;
}
/* Enumerate the battery device interfaces.
EnumProc should be called by this function once for each battery interface
without skipping any inaccessible devices, starting at 0 until the last
interface.
TRUE: EnumProc was called and returned TRUE for all interfaces.
FALSE: No interfaces found, out of memory or EnumProc returned FALSE.
*/
BOOL WINAPI EnumBattInterfaces(BATTINTENUMPROC EnumProc, void *cbdata)
{
HDEVINFO hdev = SetupDiGetClassDevs(&GUID_DEVCLASS_BATTERY, 0, 0,
DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if(hdev == INVALID_HANDLE_VALUE)
return FALSE;
DWORD idev = 0;
for(; idev < 100; ++idev) {
struct device device;
device.slot = idev;
device.handle = INVALID_HANDLE_VALUE;
device.path = NULL;
SP_DEVICE_INTERFACE_DATA did = { sizeof did, };
if(SetupDiEnumDeviceInterfaces(hdev, NULL, &GUID_DEVCLASS_BATTERY, idev,
&did)) {
DWORD cbRequired = 0;
if(!SetupDiGetDeviceInterfaceDetailW(hdev, &did, NULL, 0,
&cbRequired, 0) &&
GetLastError() == ERROR_INSUFFICIENT_BUFFER) {
PSP_DEVICE_INTERFACE_DETAIL_DATA_W pdidd =
(PSP_DEVICE_INTERFACE_DETAIL_DATA_W)calloc(1, cbRequired);
if(!pdidd) {
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
pdidd->cbSize = sizeof(*pdidd);
if(SetupDiGetDeviceInterfaceDetailW(hdev, &did, pdidd, cbRequired,
&cbRequired, 0)) {
device.path = _wcsdup(pdidd->DevicePath);
if(!device.path) {
free(pdidd);
SetLastError(ERROR_NOT_ENOUGH_MEMORY);
return FALSE;
}
device.handle = CreateFileW(device.path,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
}
free(pdidd);
}
}
else if(GetLastError() == ERROR_NO_MORE_ITEMS)
break;
BOOL rc = EnumProc(&device, cbdata);
DWORD gle = GetLastError();
free(device.path);
if(device.handle != INVALID_HANDLE_VALUE)
CloseHandle(device.handle);
if(!rc) {
SetLastError(gle);
return FALSE;
}
}
return TRUE;
}
void ShowIndividualBatteryHealth()
{
const char *borderline = "========================================="
"======================================\n";
const char *sepline = "-----------------------------------------"
"--------------------------------------\n";
wstringstream wss;
wss << borderline <<
"Individual Battery Health:\n"
"\n"
"This program is designed to monitor the overall combined battery capacity,\n"
"however what follows is the percentage of how much capacity each individual\n"
"battery is currently able to store (full capacity) versus how much capacity\n"
"it was initially able to store (design capacity), also known as health. A\n"
"battery will lose health the more charge cycles it is put through. Other\n"
"factors affect health such as the method of charging. For example, in my\n"
"experience working on a number of Dell Latitudes, the ExpressCharge feature\n"
"can reduce health faster than normal.\n";
vector<battery> batteries;
EnumBattInterfaces(EnumBattInterfacesProc, &batteries);
unsigned batteries_present = 0;
for(DWORD i = 0; i < batteries.size(); ++i, wss << sepline) {
wss << "\n" << sepline;
wss << "Slot #" << i << ": "
<< (batteries[i].path ? batteries[i].path : L"(inaccessible)") << "\n";
if(batteries[i].tag == BATTERY_TAG_INVALID) {
wss << "(empty)\n";
continue;
}
++batteries_present;
if(!batteries[i].success) {
wss << "(inaccessible)\n";
continue;
}
wss << "\n\"" << batteries[i].unique_id << "\" is at "
<< std::fixed << setprecision(2)
<< batteries[i].health << "% health\n";
wss << "\n" << BatteryInformationStr(&batteries[i].info).c_str();
wss << left << setw(BATT_FIELD_WIDTH) << "Manufacture Date: "
<< right << ManufactureDateStr(&batteries[i].mnfctr_date).c_str()
<< "\n";
}
wss << "\nCounted " << batteries_present << " "
<< (batteries_present == 1 ? "battery" : "batteries") << " "
<< "and " << batteries.size() << " battery interfaces. "
<< "(" << TimeToLocalTimeStr(time(NULL)).c_str() << ")\n";
wss << "\n" << borderline;
wcout << endl << wss.str() << endl;
}
string ACLineStatusStr(unsigned ACLineStatus)
{
switch(ACLineStatus)
{
case 0: return "Offline";
case 1: return "Online";
case 255: return "Unknown status";
}
return UndocumentedValueStr(ACLineStatus);
}
string BatteryFlagStr(unsigned BatteryFlag)
{
/* BatteryFlag "value is zero if the battery is not being charged and the
battery capacity is between low and high." ie if 33 <= percentage <= 66.
Earlier revisions of this function showed 'Normal' instead of '<none>',
but that was less correct since technically 'Normal' is not a flag, and
things like 'Normal | Charging' would need to be handled. */
if(BatteryFlag == 0)
return "<none>";
stringstream ss;
#define EXTRACT_BATTERYFLAG(flag, name) \
if((BatteryFlag & flag)) { \
if(ss.tellp() > 0) \
ss << " | "; \
ss << name; \
BatteryFlag &= ~flag; \
}
EXTRACT_BATTERYFLAG(1, "High");
EXTRACT_BATTERYFLAG(2, "Low");
EXTRACT_BATTERYFLAG(4, "Critical");
EXTRACT_BATTERYFLAG(SPSF_BATTERYCHARGING, "Charging");
EXTRACT_BATTERYFLAG(SPSF_BATTERYNOBATTERY, "No system battery");
EXTRACT_BATTERYFLAG(255, "Unknown status");
if(BatteryFlag) {
if(ss.tellp() > 0)
ss << " | ";
ss << UndocumentedValueStr(BatteryFlag);
}
return ss.str();
}
/* BatteryLifePercent is "255 if status is unknown." */
#define PERCENT_UNKNOWN ((BYTE)255)
string BatteryLifePercentStr(unsigned BatteryLifePercent)
{
stringstream ss;
if(BatteryLifePercent <= 100)
ss << (DWORD)BatteryLifePercent << "%";
else if(BatteryLifePercent == PERCENT_UNKNOWN)
ss << "Unknown status";
else
ss << UndocumentedValueStr(BatteryLifePercent);
return ss.str();
}
/* SystemStatusFlag:
"This flag and the GUID_POWER_SAVING_STATUS GUID were introduced in Windows 10.
This flag was previously reserved, named Reserved1, and had a value of 0."
*/
string SystemStatusFlagStr(unsigned SystemStatusFlag)
{
switch(SystemStatusFlag)
{
case 0: return "Battery saver is off";
case 1: return "Battery saver is on";
}
return UndocumentedValueStr(SystemStatusFlag);
}
/* BatteryLifeTime is "-1 if remaining seconds are unknown or if the device
is connected to AC power." */
#define LIFETIME_UNKNOWN ((DWORD)-1)
/* Format the number of battery life seconds in the same format as the systray:
1 hr 01 min; 1 hr 00 min; 1 min or "Unknown" if LIFETIME_UNKNOWN.
*/
string BatteryLifeTimeStr(DWORD BatteryLifeTime)
{
if(BatteryLifeTime == LIFETIME_UNKNOWN)
return "Unknown";
DWORD hours = BatteryLifeTime / 3600;
DWORD minutes = (BatteryLifeTime % 3600) / 60;
stringstream ss;
if(hours) {
ss << hours << " hr " << setw(2);
ss.fill('0');
}
ss << minutes << " min";
return ss.str();
}
/* BatteryFullLifeTime:
"The system is only capable of estimating BatteryFullLifeTime based on
calculations on BatteryLifeTime and BatteryLifePercent. Without smart battery
subsystems, this value may not be accurate enough to be useful."
*/
string BatteryFullLifeTimeStr(DWORD BatteryFullLifeTime)
{
return BatteryLifeTimeStr(BatteryFullLifeTime);
}
void ShowPowerStatus(const SYSTEM_POWER_STATUS *status)
{
#define SHOW_STATUS(item) \
cout << left << setw(BATT_FIELD_WIDTH) << #item ": " \
<< right << item##Str(status->item) << "\n";
SHOW_STATUS(ACLineStatus);
SHOW_STATUS(BatteryFlag);
SHOW_STATUS(BatteryLifePercent);
if(os.dwMajorVersion >= 10) { /* SystemStatusFlag was added in Windows 10 */
cout << left << setw(BATT_FIELD_WIDTH) << "SystemStatusFlag: "
<< right << SystemStatusFlagStr(status->SystemStatusFlag) << "\n";
}
SHOW_STATUS(BatteryLifeTime);
SHOW_STATUS(BatteryFullLifeTime);
cout << flush;
}
enum cpstype { CPS_EQUAL, CPS_NOTEQUAL };
enum cpstype ComparePowerStatus(const SYSTEM_POWER_STATUS *a,
const SYSTEM_POWER_STATUS *b)
{
#define COMPARE_STATUS(item) \
if(a->item != b->item) \
return CPS_NOTEQUAL;
COMPARE_STATUS(ACLineStatus);
COMPARE_STATUS(BatteryFlag);
COMPARE_STATUS(BatteryLifePercent);
COMPARE_STATUS(SystemStatusFlag);
COMPARE_STATUS(BatteryLifeTime);
COMPARE_STATUS(BatteryFullLifeTime);
return CPS_EQUAL;
}
#define FUNC_SHOW_BOOL(item) \
string item##Str(BOOL item) \
{ \
stringstream ss; \
ss << (item == TRUE ? "TRUE" : \
(item == FALSE ? "FALSE" : \
UndocumentedValueStr(item))); \
return ss.str(); \
}
FUNC_SHOW_BOOL(AcOnLine);
FUNC_SHOW_BOOL(BatteryPresent);
FUNC_SHOW_BOOL(Charging);
FUNC_SHOW_BOOL(Discharging);
string MaxCapacityStr(DWORD MaxCapacity)
{
return CapacityStr(MaxCapacity);
}
string RemainingCapacityStr(DWORD RemainingCapacity)
{
return CapacityStr(RemainingCapacity);
}
string EstimatedTimeStr(DWORD EstimatedTime)
{
return BatteryLifeTimeStr(EstimatedTime);
}
void ShowBatteryState(const SYSTEM_BATTERY_STATE *state)
{
#define SHOW_STATE(item) \
cout << left << setw(BATT_FIELD_WIDTH) << #item ": " \
<< right << item##Str(state->item) << "\n";
SHOW_STATE(AcOnLine);
SHOW_STATE(BatteryPresent);
SHOW_STATE(Charging);
SHOW_STATE(Discharging);
SHOW_STATE(MaxCapacity);
SHOW_STATE(RemainingCapacity);
SHOW_STATE(Rate);
SHOW_STATE(EstimatedTime);
SHOW_STATE(DefaultAlert1);
SHOW_STATE(DefaultAlert2);
cout << flush;
}
/* Return the battery power rate in mW.
A negative rate means discharging and a positive rate means charging.
0 means neither charging nor discharging.
Ignore errors: Don't show them and return 0.
*/
LONG GetBatteryPowerRate()
{
/* Note SYSTEM_BATTERY_STATE seems to be updated by the OS at the same
frequency as SYSTEM_POWER_STATUS, which is not necessarily that often. */
SYSTEM_BATTERY_STATE sbs;
if(CallNtPowerInformation(SystemBatteryState, NULL, 0, &sbs, sizeof sbs))
return 0;
/* As described in RateStr(), 0x80000000 is an invalid value and any other
value should be converted to LONG. */
return ((DWORD)sbs.Rate != 0x80000000) ? (LONG)sbs.Rate : 0;
}
LRESULT CALLBACK WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
if(verbose >= 3)
{
/* show all window messages */
cout << TIMESTAMPED_PREFIX
<< hex << "WindowProc: msg 0x" << msg << ", wparam 0x" << wParam
<< ", lparam 0x" << lParam << dec << endl;
}
switch(msg) {
/* WM_POWERBROADCAST:
"Notifies applications of a change in the power status of the computer,
such as a switch from battery power to A/C. The system also broadcasts
this event when remaining battery power slips below the threshold
specified by the user or if the battery power changes by a specified
percentage."
PBT_APMPOWERSTATUSCHANGE:
"This event can occur when battery life drops to less than 5 minutes, or
when the percentage of battery life drops below 10 percent, or if the
battery life changes by 3 percent."
Note this is a broadcast message and therefore not received by
message-only windows. */
case WM_POWERBROADCAST:
if(wParam == PBT_APMPOWERSTATUSCHANGE) {
static SYSTEM_POWER_STATUS status, prev_status;
prev_status = status;
if(GetSystemPowerStatus(&status)) {
#if 0
cout << "PBT_APMPOWERSTATUSCHANGE DEBUG: \n---\n(prev_status)\n";
ShowPowerStatus(&prev_status);
cout << "---\n(status)\n";
ShowPowerStatus(&status);
cout << "---" << endl;
#endif
/* If the charge state is being suppressed but only it or members
affected by it have changed then don't show anything. */
if(suppress_charge_state &&
status.BatteryLifePercent == prev_status.BatteryLifePercent &&
((status.BatteryFlag & ~SPSF_BATTERYCHARGING) ==
(prev_status.BatteryFlag & ~SPSF_BATTERYCHARGING)))
return TRUE;
}
else
status = prev_status;
}
#define CASE_PBT(item) \
case item: cout << #item; break;
cout << TIMESTAMPED_PREFIX << "WM_POWERBROADCAST: ";
switch(wParam) {
CASE_PBT(PBT_APMQUERYSUSPEND); /* 0x0000 */ /* Win2k & XP only */
CASE_PBT(PBT_APMQUERYSTANDBY); /* 0x0001 */ /* Win2k & XP only */
CASE_PBT(PBT_APMQUERYSUSPENDFAILED); /* 0x0002 */ /* Win2k & XP only */
CASE_PBT(PBT_APMQUERYSTANDBYFAILED); /* 0x0003 */ /* Win2k & XP only */
CASE_PBT(PBT_APMSUSPEND); /* 0x0004 */
CASE_PBT(PBT_APMSTANDBY); /* 0x0005 */
CASE_PBT(PBT_APMRESUMECRITICAL); /* 0x0006 */ /* Win2k & XP only */
CASE_PBT(PBT_APMRESUMESUSPEND); /* 0x0007 */
CASE_PBT(PBT_APMRESUMESTANDBY); /* 0x0008 */
CASE_PBT(PBT_APMBATTERYLOW); /* 0x0009 */ /* Win2k & XP only */
CASE_PBT(PBT_APMPOWERSTATUSCHANGE); /* 0x000A */
CASE_PBT(PBT_APMOEMEVENT); /* 0x000B */ /* Win2k & XP only */
CASE_PBT(PBT_APMRESUMEAUTOMATIC); /* 0x0012 */
CASE_PBT(PBT_POWERSETTINGCHANGE); /* 0x8013 */
default: cout << UndocumentedValueStr(wParam);
}
if(lParam == 0 &&
wParam != PBT_APMQUERYSUSPEND &&
wParam != PBT_APMQUERYSTANDBY) {
/* lParam in this case has no significance so skip showing it */
cout << endl;
return TRUE;
}
cout << " (lParam: ";
if(wParam == PBT_APMQUERYSUSPEND ||
wParam == PBT_APMQUERYSTANDBY) {
LPARAM unknown = (LPARAM)(lParam & ~1);