Exit a running program by pressing "Esc" key

quddos · #1 06-Mar-2009, 13:33

How can I exit a running program by pressing "esc" key? Actually I want to use it in my minesweeper assignment. The game is complete but only that portion is incomplete.

Mexican Bob · #2 07-Mar-2009, 04:54

Quote:

Originally Posted by quddos

How can I exit a running program by pressing "esc" key? Actually I want to use it in my minesweeper assignment. The game is complete but only that portion is incomplete.

Hope that you don't mind that this is a "C" response to your "C++" question, but it may work for your needs.

CPP / C++ / C Code:

#include <cstdio>

using namespace std;

const char* ASCII[] =  { "NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL", "BS",  "TAB", "LF",  "VT",  "FF",  "CR",  "SO",  "SI",
                         "DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB", "CAN", "EM",  "SUB", "ESC", "FS",  "GS",  "RS",  "US",
                         "SPC", "!",   "\"",  "#",   "$",   "%",   "&",   "'",   "(",   ")",   "*",   "+",   ",",   "-",   ".",   "/",
                         "0",   "1",   "2",   "3",   "4",   "5",   "6",   "7",   "8",   "9",   ":",   ";",   "<",   "=",   ">",   "?",
                         "@",   "A",   "B",   "C",   "D",   "E",   "F",   "G",   "H",   "I",   "J",   "K",   "L",   "M",   "N",   "O",
                         "P",   "Q",   "R",   "S",   "T",   "U",   "V",   "W",   "X",   "Y",   "Z",   "[",   "\\",  "]",   "^",   "_",
                         "`",   "a",   "b",   "c",   "d",   "e",   "f",   "g",   "h",   "i",   "j",   "k",   "l",   "m",   "n",   "o",
                         "p",   "q",   "r",   "s",   "t",   "u",   "v",   "w",   "x",   "y",   "z",   "{",   "|",   "}",   "~",   "DEL"};

int main()
{
    const static char ESC   = 0x1B;
    char c = 0;
    do
    {
        c = getchar();
        printf("key pressed = %s\n", ASCII[(size_t)c]);
    } while(c != ESC);
    return 0;
}

Output:

Code:

$ ./esc_key

key pressed = LF
a
key pressed = a
key pressed = LF
b
key pressed = b
key pressed = LF
c
key pressed = c
key pressed = LF
D
key pressed = D
key pressed = LF
4
key pressed = 4
key pressed = LF
$
key pressed = $
key pressed = LF
^[
key pressed = ESC

MxB

quddos · #3 07-Mar-2009, 13:05

yar your code is a little bit helpful i need to exit the runnig program at any instant.but your code only exit when compiler reades getchar() statement.thankx buddy.

Mexican Bob · #4 07-Mar-2009, 18:34

Quote:

Originally Posted by quddos

yar your code is a little bit helpful i need to exit the runnig program at any instant.but your code only exit when compiler reades getchar() statement.thankx buddy.

Hello?! What did you tell us about "your program?" Nothing. What did you tell us about the system that you're using? Nothing. My code only "exits" when the compiler reads getchar is NOT TRUE. My code only exits when a conditional expression evaluates to true and that is when a character "c" is equal to the ASCII value for the escape key.

If you want to exit the program "at any instant" then you probably will need a PLATFORM SPECIFIC method of trapping and/or handling the escape key. You'll note that you did not provide the platform you're using in any of your remarks. Therefore, I provided you with a platform agnostic way of responding to key presses. If that doesn't satisfy your requirements, do not "blame" my response, blame YOUR set of requirements as you posted.

If you are using Windoze, which is highly likely considering your attention to detail, I'd recommend that you trap VK_ESC in your main Windows procedure when looking for WM_KEYDOWN. Of course, that is assuming a lot, which I didn't do previously.

If you want to modify your requirements after posting, please do so, but don't act like I didn't "solve" the problem as you presented it simply because I didn't give you the answer that you wanted, but failed to ask in a specific and direct way. What makes you think that I will give you any more useful information than the computer that you're trying to program? It will do exactly what you tell it to do. If that isn't what you want, you need to approach the problem from a different perspective...because you haven't yet found the one that works, huh?

MxB

quddos · #5 08-Mar-2009, 01:27

I have posted complete code of my assignment. I am using Windows as operating system and dev as compiler. Now kindly tell me how would I exit the program at any instant by pressing esc key.

CPP / C++ / C Code:

/*
Abdul quddos
bte-fa07-003-8c
*/

#include<iostream>
#include<conio.h>
#include<stdlib.h>
#include<string.h>
#include<stdio.h>

using namespace std;
int main()
{      
      // clrscr();
       int i,j,x,x1,l2,y,t,r,x2,i1,j1,l=0;
       char a[8][8]={'o','m','o','o','m','o','o','m',
		            'm','o','o','o','m','o','m','o',
		            'o','o','m','o','o','m','m','o',
		            'm','o','o','m','o','o','m','o',
		            'o','o','o','m','o','m','o','m',
		            'o','m','o','m','o','o','m','m',
		            'o','m','o','m','o','o','o','m',
		            'm','o','m','m','o','m','m','o'};
		            
       char s[]={"abdul quddos"};
       char s1[15];
       cout<<"Enter Password   :";
       tag4:
       gets(s1);
       l2=strcmp(s1,s);
       if(l2!=0)
       {
        cout<<"Invalid Password  "<<endl;
         getch();
        cout<<"Enter valid password  :";
        goto tag4;
       }
       else if(l2==0)
       {
       cout <<" Login successfully "<<endl;
       }
       cout<<"\t\t\t\tMINESWEEPER\n\n\t\t\t\t    BY\n\n\t\t\t\tABDUL QUDDOS\n\n\n\n";            
       for(i=0;i<8;i++)
       {
       for(j=0;j<8;j++)
       {
       cout<<"\t"<<a[i][j];
       }
       cout<<"\n\n";
       }
       tag:
       tag2:    
       cout<<"\nenter your location : ";
       cout<<"\nenter row : ";
       cin>>x;
       if(x<0||x>8)
       {
           cin.clear();
           cin.ignore();
		   cout<<"\nInvalid input";
                   getch();
                   goto tag2;
                   }
       tag3:
       cout<<"enter column :";
       cin>>y;
       if(y<0||y>8)
       {
                   cin.clear();
                   cin.ignore();
                   cout<<"\nInvalid input";
                   getch();
                   goto tag3;
                   }
      for(i=0;i<8;i++)
      {
      for(j=0;j<8;j++)
      {
      if(i==x && j==y)
       {
	      if(a[i][j]=='m')
	      {
			    cout<<"\n\nYour value is : "<<a[i][j]<<" Game end";
			    break;
			    }
			    else if(a[i][j]=='o')
			    {
				 a[i][j]=x1;
				 l=0;
				 if((i==0)&&(j>0&&j<8))                       //row is 0 and column is (1-7)
				 {
                         
                          for(t=i;t<=i+1;t++)
				 {

						      for(r=j-1;r<=j+1;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                 }
                 else if((i>0&&i<8)&&(j==0))                  //row is(1-7) and column is 0
                 {
                      
                       for(t=i-1;t<=i+1;t++)
				 {

						      for(r=j;r<=j+1;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                 }
                 else if(i==0&&j==0)                           //row is 0 and column is 0
                 {
                      
                      
                       for(t=i;t<=i+1;t++)
				 {

						      for(r=j;r<=j+1;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                 }
                 
                 
                 else if((i>0&&i<7)&&(j>0&&j<7))                //row(1-6) and column (1-6)
                 {
                       for(t=i-1;t<=i+1;t++)
				 {

						      for(r=j-1;r<=j+1;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                  }
                  else if(i==7&&j==7)                          //row is 7 and column is 7
                  {
                        for(t=i-1;t<=i;t++)
				 {

						      for(r=j-1;r<=j;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                   }
                   else if(i==7&&j>0)                        //row is 7 and column is greater than 0
                   { 
                        for(t=i-1;t<=i;t++)
				 {

						      for(r=j-1;r<=j+1;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                        
                    }
                    else if(i>0&&j==7)                    //row is greater than 0 and column is 7
                    {
                          for(t=i-1;t<=i+1;t++)
				 {

						      for(r=j-1;r<=j;r++)
						      {
									   if(a[t][r]=='m')
									   {
											   l++;
											   }
									   }
						      }
                         
                     }
                 
                 
                     
                 
				
						      for(i1=0;i1<8;i1++)
						      {
								      for(j1=0;j1<8;j1++)
								      {
											 if(x1==a[i1][j1])
											 {
                                                             
													  for( r=48;r<57;r++)
													  {
               
													           x2=r;
													          if(l+48==x2)
													  {
													  a[x][y]=r;
                                                      cout<<"\t"<<a[i1][j1];
													  }
													  }
											 }
													  else
													  cout<<"\t"<<a[i1][j1];

								      }
								     
								      cout<<"\n\n";

						      }

				
			     }
			     goto tag;

       }
       }
       }
       getch();
       return 0;
       }

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Exit a running program by pressing "Esc" key

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