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C expert help me! Write a TSR program that changes the background color ...

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C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

Write a TSR program that changes the background color of the screen to red every 5 second and then white next 5 second, And this continues until you press ‘Q’ It should not modify the text displayed on the screen.

Hint:

1_ Intercept Keyboard interrupt (0x09H)
2_ Use video text memory address 0xB000000H
3_ Use timer interrupt.

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

No. Do your own homework.

I'm here to prove you wrong.

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

Please sir i can't do , please sir help me ..

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

>Please sir i can't do , please sir help me ..
Let me think...no. Go away. This isn't the place to beg for handouts.

I'm here to prove you wrong.

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

What operating system are you using? I might be wrong but I don't think TSRs work with MS-Windows command prompts because they only emulate MS-DOS.

>>Please sir i can't do
Narue is a woman. And just because you can not do something today doesn't mean you have to give up trying. Search the internet and visit your local bookstore. Or better yet if you are taking a class then study your textbook. But no one here is going to just give you all the code. Learn to reasearch the problem.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

ok , i have done my home work , but this background change function perform with buttons , control and shift , i can't do as requirement , so please help me ..

 Help with Code Tags 
 c Syntax (Toggle Plain Text) 
#include <dos.h>
#include <stdio.h>
#include <conio.h>
 
void interrupt (*oldKey)( );
void interrupt newKey ( );
char far *scr = (char far* ) 0xB8000000;
char far *scr1=(char far* ) 0x00400017;
 
int i=0;
int main( )
{
	oldKey = getvect(9);
	setvect (9,newKey);
	keep(0,1000);			//To Make it TSR
 
	return 0;
}
 
void interrupt newKey ( )
{
	if (((*scr1)&4) == 4) /* Ctrl */
	{
		for (i =0; i <=4000; i +=2)
		{
			*(scr + i + 1) = 0x40; /* red background */
		}
	}
	if (((*scr1)&2) == 2) /* Left Shift */
	{
		for (i =0; i <=4000; i +=2)
		{
			*(scr + i + 1) = 0x70; /* white background */
		}
	}
       (*oldKey) ( );
}
#include <dos.h>
#include <stdio.h>
#include <conio.h>

void interrupt (*oldKey)( );
void interrupt newKey ( );
char far *scr = (char far* ) 0xB8000000;
char far *scr1=(char far* ) 0x00400017;

int i=0;
int main( )
{
	oldKey = getvect(9);
	setvect (9,newKey);
	keep(0,1000);			//To Make it TSR

	return 0;
}

void interrupt newKey ( )
{
	if (((*scr1)&4) == 4) /* Ctrl */
	{
		for (i =0; i <=4000; i +=2)
		{
			*(scr + i + 1) = 0x40; /* red background */
		}
	}
	if (((*scr1)&2) == 2) /* Left Shift */
	{
		for (i =0; i <=4000; i +=2)
		{
			*(scr + i + 1) = 0x70; /* white background */
		}
	}
       (*oldKey) ( );
}

Last edited by Ancient Dragon; Oct 12th, 2007 at 5:47 pm. Reason: add code tags

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

you need to do that in a timer interrupt service so that the service gets called every clock tick. Then inside the service function you need to keep track of the most reent time the color was changed and compare that time with the current time. If 5 or more seconds have elapsed then change the color again and reset your time counter.

The newkey interrupt service you wrote only needs to check if the 'Q' key was hit, and if it has then uninstall both interrupt services you have installed and uninstall the TSR.

None of the above are trivel things to write and will require some research on your part how to do them.

Last edited by Ancient Dragon; Oct 12th, 2007 at 5:55 pm.

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Re: C expert help me! Write a TSR program that changes the background color ...

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Oct 12th, 2007

if you can help me please change my code as requirment , if you can not do i will get help from www.cramster.com , cramster experts can do everything,

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Re: C expert help me! Write a TSR program that changes the background color ...

Oct 12th, 2007

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Originally Posted by bc030400412

if you can help me please change my code as requirment , if you can not do i will get help from www.cramster.com , cramster experts can do everything,

Yes they are very good too. If you want someone to do your homework then bye, you won't hurt my feelings.