KeyBoard Interrupt ScreenSvr (stucked)

[devilShadow]

Write a TSR program in C that will clear all the contents of the screen and print your VU ID and Name (BC0000000-Name) at the center of the video text memory available at 0xB8000000 whenever Alt+Ctrl+D combination is pressed from keyboard.
Note that you have to take the backup of the contents of video text memory before clearing the screen. And, whenever Alt+Ctrl+R combination is pressed from the keyboard, all the contents of video text memory should be restored.


I Am trying this code but still need to check keys.

#include<DOS.H>
#include<stdio.h>
void interrupt (*oldint)();
void interrupt getContents();
unsigned char far *scr = (unsigned char far*)0xb8000680;
unsigned char far *src = (unsigned char far*)0xb8000000;
unsigned char far *sch = (unsigned char far*)0x00400017;
int i;
char charsrc[4000];


void interrupt getContents(){


//saving contents
    for(i=0; i < 4000; i++)
    charsrc[i] = *(src+i);
//getContentsing Screen
    for(i=0; i < 4000; i+=2)
    {
        *(src + i) = 0x20;
        *(src + i + 1) = 0x07;
    }
    echoChar();
}
//Prints RollNo and Name at Center of Graphics Text Memory
void echoChar(){
     *scr = 0x6D;
    *(scr+1) = 0x70;
    *(scr+2) = 0x63;
    *(scr+3) = 0x07;
    *(scr+4) = 0x31;
    *(scr+5) = 0x07;
    *(scr+6) = 0x34;
    *(scr+7) = 0x07;
    *(scr+8) = 0x30;
    *(scr+9) = 0x07;
    *(scr+10) = 0x34;
    *(scr+11) = 0x07;
    *(scr+12) = 0x30;
    *(scr+13) = 0x07;
    *(scr+14) = 0x32;
    *(scr+15) = 0x07;
    *(scr+16) = 0x32;
    *(scr+17) = 0x07;
    *(scr+18) = 0x39;
    *(scr+19) = 0x07;
    *(scr+20) = 0x37;
    *(scr+159) = 0x07;
    *(scr+160) = 0x53;
    *(scr+161) = 0x07;
    *(scr+162) = 0x61;
    *(scr+163) = 0x07;
    *(scr+164) = 0x6C;
    *(scr+165) = 0x07;
    *(scr+166) = 0x6D;
    *(scr+167) = 0x07;
    *(scr+168) = 0x61;
    *(scr+169) = 0x07;
    *(scr+170) = 0x6E;
    *(scr+171) = 0x07;
    *(scr+172) = 0x20;
    *(scr+173) = 0x07;
    *(scr+174) = 0x48;
    *(scr+175) = 0x07;
    *(scr+176) = 0x61;
    *(scr+177) = 0x07;
    *(scr+178) = 0x69;
    *(scr+179) = 0x07;
    *(scr+180) = 0x64;
    *(scr+181) = 0x07;
    *(scr+182) = 0x65;
    *(scr+183) = 0x07;
    *(scr+184) = 0x72;
}
void restoreContents(){
    for(i=0; i < 4000; i++)
        *(src + i) = charsrc[i];
}
void main(){
    oldint = getvect(0x09);
    setvect(0x09,getContents);
    keep(0,1000);
    restoreContents();


}

[Elkvis]

On any modern operating system, this program is all but certain to crash. This might be valid on an old dos system, or maybe even running inside an emulator like dosbox, but the entire exercise that you're performing here is obsolete.

[devilShadow]

This is a TSR program which invokes int9 when ctrl+alt+L key pressed and then clear the screen get the backup of text screen and then prints the characters on screen
Second when ctrl+alt+R key pressed then it restored the contents on the screen.
it can work as a screen saver

[algorism]

We know what it is. What kind of system are you trying to run it on?

[devilShadow]

64 Bit OS-Windows it works over my system using Emulator (DOSBOX 16 bit) but here in this code i didnt putt the code of keyboard invocation in AL register or so what ?
Can you please insert the code into it for the keys pressing

[devilShadow]

@Elkvis suggest me the code to call the interrupt 9 only when ctrl+alt+L key pressed

[Elkvis]

Writing code like this is literally a waste of time. There is absolutely no market, and no legitimate purpose to learn how to write directly to the screen in DOS. DOS is obsolete and learning to code for it will not help you in any way. Get a modern book on C programming, and get a real development environment, such as Code::Blocks or Eclipse, which are both free, or CLion, which is a commercial product, but if you're a student, you may be able to get a free license.

[Elkvis]

@Elkvis suggest me the code to call the interrupt 9 only when ctrl+alt+L key pressed

No. I won't. You're wasting your time with this garbage.

[devilShadow]

Writing code like this is literally a waste of time. There is absolutely no market, and no legitimate purpose to learn how to write directly to the screen in DOS. DOS is obsolete and learning to code for it will not help you in any way. Get a modern book on C programming, and get a real development environment, such as Code::Blocks or Eclipse, which are both free, or CLion, which is a commercial product, but if you're a student, you may be able to get a free license.

This is a part of my assingment today is the last date of university i have to submit it.

[algorism]

This is a part of my assingment today is the last date of university i have to submit it.

Then you shouldn't have left it to the last minute.

You could maybe experiment with conio.h's _getch function, but people aren't much interested in this antiquated style of programming around here. Maybe there's a DOS-lovers site somewhere you could try. E.g., DOS Programming, Undocumented DOS, and DOS Secrets

[devilShadow]

Then you shouldn't have left it to the last minute.

You could maybe experiment with conio.h's _getch function, but people aren't much interested in this antiquated style of programming around here. Maybe there's a DOS-lovers site somewhere you could try. E.g., DOS Programming, Undocumented DOS, and DOS Secrets

Will you suggest me the code as you are an expert ?

[Codeplug]

What is this "D.O.S" you speak of?

gg

[algorism]

Will you suggest me the code as you are an expert ?

I have no interest in it and am certainly not an expert! You're the one running a DOS emulator on a windows machine, not me. Experiment with _getch and see what values it spews back when you hit your desired key combo.

[devilShadow]

What is this "D.O.S" you speak of?

gg

I need the code for ctrl+alt+L key pressing to call int9

[Codeplug]

Save off the original int9 interupt function, install your own interrupt function in its place, and see what the scan codes are when pressing ctrl+alt+L.

Or - if it's not too late - drop out of the class and ask for your money back.

gg