Test if key is pressed using Turbo C++

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I want to know how to test whether the key shift, ctrl and alt are pressed or not using Turbo C++ code.

Posted 2-Sep-10 1:31am

lydara

Updated 2-Sep-10 1:47am

CPallini

v2

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Aescleal · Answer 1 · 2010-09-02T01:54:00

Check the byte at 0x40:17 - it contains the shift state, alt state and ctrl key state in a DOS program - which I presume you're writing if you're using Turbo C. I can't remember what the bits are so you'll have to write a little program to output the byte there when you've pressed various contol/sh*t/alt keys.

To access this byte you need a far pointer:

unsigned char far *key_state_bye = (unsigned char far *)0x00400017;

I can't remember how const capable Turbo C was but if it can manage to make the value const I'd make it const as well to prevent accidents.

Cheers,

Ash

CPallini · Answer 2 · 2010-09-02T01:52:00

Solution 1

You may try the kbhit() function (though I'm not sure it will make the trick). Why dont' you use a more updated development tool, like, for instance Visual C++ Express Edition (it's free)?
:)

Posted 2-Sep-10 1:52am

CPallini

Comments

Peter_in_2780 2-Sep-10 21:15pm

see my answer below ...P

ThatsAlok 3-Sep-10 3:00am

if i would, i never want to stop programming in turbo c++.. but no company actually want to program for dos now. thats why shifted my guards and programming in visual studio!

CPallini 3-Sep-10 3:21am

If I would I never want to stop programming in Z80 Assembly for my Spectrum...

Peter_in_2780 · Answer 3 · 2010-09-02T15:15:00

Solution 3

Sorry to say this, but Ash and CP are a little out of touch. Turbo Cplusplus is a 21st Century product. (Consider it the "Express" edition of Borland C++ Studio.) If you are using VCL, then the KeyDown event includes the ctrl/alt/shift state as an argument. If you are writing a console application, then have a look at the Turbo C++ help on GetKeyState() and related functions. (There is another way to do it, but I've forgotten...)

Posted 2-Sep-10 15:15pm

Peter_in_2780

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ThatsAlok 3-Sep-10 2:58am

i doubt that..turbo c++ is quite old application, which used to run dos plateform. I am sure dos is not 21st century product, it's consider outdated in 20th century itself

CPallini 3-Sep-10 3:05am

We remember well, actually. Turbo C++ was born in the '90. It's evanescent revival, however, became extinct in 2006. :-)
@Alok: see 'the 21 century' product in http://en.wikipedia.org/wiki/Turbo_C%2B%2B. :-)

Peter_in_2780 3-Sep-10 3:07am

@ThatsAlok WRONG WRONG WRONG. I run Turbo C++ 2006, and it definitely doesn't do DOS! Broland's fault for recycling the name for a totally different product.

CPallini 3-Sep-10 3:20am

Indeed, it is a Borland fault. It's a shame you didn't use 'the original' it was really an amazing product.

Peter_in_2780 3-Sep-10 3:26am

I did, and its even-more-amazing-for-its-time predecessor, Turbo Pascal. Absolutely blew our socks off!