Writing current battery charge to a float value?

This is a discussion on Writing current battery charge to a float value? within the C Programming forums, part of the General Programming Boards category; I've found examples on the web for this- none of which are for C. Can anyone provide an example of ...

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    Writing current battery charge to a float value?

    I've found examples on the web for this- none of which are for C. Can anyone provide an example of a C program that scans a laptop's battery charge and writes that to a float value? I'm not at all sure how to go about doing this.

    Thanks in advance!

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    That's C++, but beggars can't be picky. Thanks! I'll see what I can do with this. B-)

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    Quote Originally Posted by Flotonic View Post
    That's C++, but beggars can't be picky. Thanks! I'll see what I can do with this. B-)
    It is NOT C++... You can do that very easily in standard C....

    What it is is a simple windows API call... Like most of them, you provide the requisite struct, call the function and then extract the data you need...

    Here's what the GetSystemPowerStatusEx2 function returns...
    Code:
    typedef struct _SYSTEM_POWER_STATUS_EX2 {
      BYTE ACLineStatus;
      BYTE BatteryFlag;
      BYTE BatteryLifePercent;
      BYTE Reserved1;
      DWORD BatteryLifeTime;
      DWORD BatteryFullLifeTime;
      BYTE Reserved2;
      BYTE BackupBatteryFlag;
      BYTE BackupBatteryLifePercent;
      BYTE Reserved3;
      DWORD BackupBatteryLifeTime;
      DWORD BackupBatteryFullLifeTime;
      DWORD BatteryVoltage;
      DWORD BatteryCurrent;
      DWORD BatteryAverageCurrent;
      DWORD BatteryAverageInterval;
      DWORD BatterymAHourConsumed;
      DWORD BatteryTemperature;
      DWORD BackupBatteryVoltage;
      BYTE BatteryChemistry;
      //  Add any extra information after the BatteryChemistry member.
    } SYSTEM_POWER_STATUS_EX2, *PSYSTEM_POWER_STATUS_EX2, *LPSYSTEM_POWER_STATUS_EX2;
    In C.... #include <winbase.h> and link with coredll.lib....
    Code:
    float GetBatteryTime(void)
      { SYSTEM_POWER_STATUS_EX2  Stat;
         if (GetSystemPowerStatusEx2(&Stat,sizeof(Stat),TRUE))
           return (float) Stat.BatteryLifeTime;      
         else 
           return -1;  }  // error message;
    Really... it's not that hard.
    Last edited by CommonTater; 04-01-2011 at 12:01 PM.

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    Ahh. I got confused because most of the sources on Microsoft.com are in non-C languages. Again, thanks! You did a good job breaking it all down.

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    Quote Originally Posted by Flotonic View Post
    Ahh. I got confused because most of the sources on Microsoft.com are in non-C languages. Again, thanks! You did a good job breaking it all down.
    90% of the Windows API is written in C .... some of the newer stuff is C++...

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    Quote Originally Posted by Codeplug View Post
    GetSystemPowerStatus Function (Windows)
    SYSTEM_POWER_STATUS Structure (Windows)

    Assuming you're not using Windows Embedded CE...

    gg
    Yep... that'll probably be better for laptops... Thanks.

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