在Windows Mobile设备上获取当前电池电量

该示例代码演示了如何在Windows Mobile设备上利用API函数获取当前设备的电池电量，并将结果打印到调试窗口。

#include <windows.h>
#include <pwrioctl.h>
#include <stdio.h>

void GetBatteryLevel()
{
    HANDLE hPower;
    BOOL bResult;
    BATTERYINFO batteryInfo;
    DWORD dwOutBufSize;

    hPower = CreateFile(L"POWERSYS", GENERIC_READ | GENERIC_WRITE, 0,
        NULL, 0, 0, NULL);

    if (hPower == INVALID_HANDLE_VALUE)
    {
        printf("GetBatteryLevel error: %d\n", GetLastError());
        return;
    }

    bResult = DeviceIoControl(hPower, IOCTL_BATTERY_QUERY_TAG, NULL, 0,
        &batteryInfo.BatteryTag, sizeof(batteryInfo.BatteryTag),
        &dwOutBufSize, NULL);

    if (!bResult)
    {
        printf("GetBatteryLevel error: %d\n", GetLastError());
        CloseHandle(hPower);
        return;
    }

    bResult = DeviceIoControl(hPower, IOCTL_BATTERY_QUERY_INFORMATION,
        &batteryInfo.BatteryTag, sizeof(batteryInfo.BatteryTag),
        &batteryInfo, sizeof(batteryInfo), NULL, NULL);

    if (!bResult)
    {
        printf("GetBatteryLevel error: %d\n", GetLastError());
        CloseHandle(hPower);
        return;
    }

    printf("Battery Level: %d%%\n", batteryInfo.FullChargeCapacity ?
        (batteryInfo.RemainingCapacity * 100) /
        batteryInfo.FullChargeCapacity : 100);

    CloseHandle(hPower);
}

int main()
{
    GetBatteryLevel();
    return 0;
}

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