枚举电池设备
若要枚举本地计算机上的电池设备，请使用 SetupDiGetClassDevs 函数。 ClassGuid 参数是指向 BatClass.h) 中定义的GUID_DEVCLASS_BATTERY (的指针。 若要枚举所有电池，请将 枚举器 参数设置为 NULL ，并将 Flags 参数设置为 DIGCF_PRESENT | DIGCF_INTERFACEDEVICE。 若要获取电池设备的名称，请对返回的数据使用 SetupDiEnumDeviceInterfaces 和 SetupDiGetDeviceInterfaceDetail 函数。 若要为每个电池设备打开文件句柄，请使用这些名称调用 CreateFile 函数。
以下 C++ 示例演示如何枚举本地计算机上的电池设备。
DWORD GetBatteryState()
{
#define GBS_HASBATTERY 0x1
#define GBS_ONBATTERY 0x2
// Returned value includes GBS_HASBATTERY if the system has a
// non-UPS battery, and GBS_ONBATTERY if the system is running on
// a battery.
//
// dwResult & GBS_ONBATTERY means we have not yet found AC power.
// dwResult & GBS_HASBATTERY means we have found a non-UPS battery.
DWORD dwResult = GBS_ONBATTERY;
// IOCTL_BATTERY_QUERY_INFORMATION,
// enumerate the batteries and ask each one for information.
HDEVINFO hdev =
SetupDiGetClassDevs(&GUID_DEVCLASS_BATTERY,
0,
0,
DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (INVALID_HANDLE_VALUE != hdev)
{
// Limit search to 100 batteries max
for (int idev = 0; idev < 100; idev++)
{
SP_DEVICE_INTERFACE_DATA did = {0};
did.cbSize = sizeof(did);
if (SetupDiEnumDeviceInterfaces(hdev,
0,
&GUID_DEVCLASS_BATTERY,
idev,
&did))
{
DWORD cbRequired = 0;
SetupDiGetDeviceInterfaceDetail(hdev,
&did,
0,
0,
&cbRequired,
0);
if (ERROR_INSUFFICIENT_BUFFER == GetLastError())
{
PSP_DEVICE_INTERFACE_DETAIL_DATA pdidd =
(PSP_DEVICE_INTERFACE_DETAIL_DATA)LocalAlloc(LPTR,
cbRequired);
if (pdidd)
{
pdidd->cbSize = sizeof(*pdidd);
if (SetupDiGetDeviceInterfaceDetail(hdev,
&did,
pdidd,
cbRequired,
&cbRequired,
0))
{
// Enumerated a battery. Ask it for information.
HANDLE hBattery =
CreateFile(pdidd->DevicePath,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (INVALID_HANDLE_VALUE != hBattery)
{
// Ask the battery for its tag.
BATTERY_QUERY_INFORMATION bqi = {0};
DWORD dwWait = 0;
DWORD dwOut;
if (DeviceIoControl(hBattery,
IOCTL_BATTERY_QUERY_TAG,
&dwWait,
sizeof(dwWait),
&bqi.BatteryTag,
sizeof(bqi.BatteryTag),
&dwOut,
NULL)
&& bqi.BatteryTag)
{
// With the tag, you can query the battery info.
BATTERY_INFORMATION bi = {0};
bqi.InformationLevel = BatteryInformation;
if (DeviceIoControl(hBattery,
IOCTL_BATTERY_QUERY_INFORMATION,
&bqi,
sizeof(bqi),
&bi,
sizeof(bi),
&dwOut,
NULL))
{
// Only non-UPS system batteries count
if (bi.Capabilities & BATTERY_SYSTEM_BATTERY)
{
if (!(bi.Capabilities & BATTERY_IS_SHORT_TERM))
{
dwResult |= GBS_HASBATTERY;
}
// Query the battery status.
BATTERY_WAIT_STATUS bws = {0};
bws.BatteryTag = bqi.BatteryTag;
BATTERY_STATUS bs;
if (DeviceIoControl(hBattery,
IOCTL_BATTERY_QUERY_STATUS,
&bws,
sizeof(bws),
&bs,
sizeof(bs),
&dwOut,
NULL))
{
if (bs.PowerState & BATTERY_POWER_ON_LINE)
{
dwResult &= ~GBS_ONBATTERY;
}
}
}
}
}
CloseHandle(hBattery);
}
}
LocalFree(pdidd);
}
}
}
else if (ERROR_NO_MORE_ITEMS == GetLastError())
{
break; // Enumeration failed - perhaps we're out of items
}
}
SetupDiDestroyDeviceInfoList(hdev);
}
// Final cleanup: If we didn't find a battery, then presume that we
// are on AC power.
if (!(dwResult & GBS_HASBATTERY))
dwResult &= ~GBS_ONBATTERY;
return dwResult;
}
若要枚举连接到远程计算机的电池设备，请在客户端脚本或应用程序中使用 Win32_Battery WMI 类。
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