Solved

Problem with interrupt calls in Delphi 4

Posted on 1998-10-31
6
318 Views
Last Modified: 2010-04-06
Hi,

I have a snippet of code here which queries to see if laptop power management is present and if so, it returns the battery power remaining.  This worked fine under Delphi 1 but under Delphi 4 I get (I think) an access violation.  :-(

I understand from Madshi (comment below) that I can't directly call an Interrupt from a Delphi 4 app.  Can anyone tell me how I can either call a 16 bit DLL or whether there is a Win32 function call to obtain the battery level information?

Thank you!
MP

Function PowerMan:Integer;
Var
  Fault,Batt,Life:Byte;
begin
  asm
    mov fault,00h
    mov ax,5300h
    mov bx,0000h
    int 15h
    jc @err
    mov ax,530ah
    mov bx,0001h
    int 15h
    mov batt,bl
    mov life,cl
    jc @err
    jmp @done
    @err: mov fault,AH
    @done: nop
  end;

  If (Fault=0) And (Life In [0..100]) Then
    PowerMan:=Life
    Else PowerMan:=-1;  // no power info
End;
0
Comment
Question by:mikepj
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 3
  • 2
6 Comments
 
LVL 20

Expert Comment

by:Madshi
ID: 1345142
Mike,

in 32bit windows you MUST NOT call dos interrupts directly. That just doesn't work. So if you really need this call and if there is no win32 equivalent function that fulfills your needs, you'll have to work with thunks...
But, man, that's quite hard stuff. You'll have to write a 16 bit dll that exports a function that does your interrupt calls (you'll need a 16 bit compiler for this purpose) and then you'll have to write a thunk in your 32 bit application to be able to call this 16 bit dll function.
Sounds hard? Yes, it is.   :-(
If you need more informations about thunking: I've a little example function, but I think there are other experts who know more about it. I'm thinking of Igor ("inter") for example. He's talking about thunking in another question that is still open (oops, I don't have the question address in the moment). Igor, are you there?

Regards, Madshi.
0
 
LVL 2

Author Comment

by:mikepj
ID: 1345143
Edited text of question
0
 
LVL 2

Author Comment

by:mikepj
ID: 1345144
Adjusted points to 100
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 4

Accepted Solution

by:
dwwang earned 100 total points
ID: 1345145
If your Notebook support Win95 Power Management, you can directly call GetSystemPowerStatus:

BOOL GetSystemPowerStatus(
    LPSYSTEM_POWER_STATUS lpSystemPowerStatus      
   );      

The structure  SystemPowerStatus contains all the infomation concerning system power status
0
 
LVL 4

Expert Comment

by:dwwang
ID: 1345146
By the way, Delphi4 will surely have a port of this API, just call it directly with necessary unit used.
0
 
LVL 2

Author Comment

by:mikepj
ID: 1345147
Thank you for your help!

[I was about 5 minutes from discovering this myself after searching for about 2 hours!]

Best regards,
MP

0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Introduction I have seen many questions in this Delphi topic area where queries in threads are needed or suggested. I know bumped into a similar need. This article will address some of the concepts when dealing with a multithreaded delphi database…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…
Suggested Courses
Course of the Month6 days, 11 hours left to enroll

636 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question