Input output

Input output

Fire Wolf

Member #7,640

August 2006

I know how to output char
textout_ex( screen, font, "", x, y, makecol( 255, 0, 0), makecol( 0, 0, 0) );

How can I output an int?

I have looked around for documentation on it can't find anything...

Also how do I input...

gnolam

Member #2,030

March 2002

Quote:

How can I output an int?

I have looked around for documentation on it can't find anything...

You can't have looked very hard...
textprintf_ex()
It's in the manual.

Quote:

Also how do I input...

Parse error. Statement too vague.

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Fire Wolf

Member #7,640

August 2006

you know, input...

In my normal c++ I would normally type
cin >> example;

Where example is the value stored.

as an example...

I just tried textprintf_ex

I get
'textprintf_ex' : cannot convert parameter 7 from 'int' to 'const char *'

gnolam

Member #2,030

March 2002

My mention of the manual was a hint.

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Fire Wolf

Member #7,640

August 2006

Ugg took me ages to get my head around it, mental block I suppose...

int money;
textprintf_ex(screen, font, 10, 10, makecol(255, 100, 200),
1, "money: %d", money);

Johan Halmén

Member #1,550

September 2001

Input is a more complex task. I guess the best solution is to use a GUI element. If you use Allegro GUI, make a simple dialog, like:

char *my_input = "        ";
DIALOG dlg[] =
{
   /* (proc)      (x) (y) (w) (h) (fg) (bg)      (key) (flags) (d1) (d2) (dp)           (dp2) (dp3) */
   { d_edit_proc, 20, 28, 84, 16, 0,   16777215, 0,    0,      4,   0,   (void*)my_input, NULL, NULL },
   { NULL,        0,  0,  0,  0,  0,   0,        0,    0,      0,   0,   NULL,          NULL, NULL }
};

popup_dialog(dlg, -1);

After that you have your input in my_input. But RTFM, to get the size of the field correct. And to get the dialog closed properly with <enter>.

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Fire Wolf

Member #7,640

August 2006

What can I use to sort of stick the GUI to the background, and when it is clicked on you can edit the field, then when I click on a button confirm it stores what is in the box.

E.g. Entering a characters name and clicking confirm.

James Stanley

Member #7,275

May 2006

Can you not read? It stores what's in the box automatically, seeing as dp is a pointer to 'my_input'. You use update_dialog (check the manual, don't just do do_dialog(); and expect it to work). You don't need to do anything to stick it to the screen, it does it automatically. If you need to run some code at the same time, either implement your own proc, and run it from within the dialog, or use some other code I can't quite remember, either way RTFM.

Also, see here

Fire Wolf

Member #7,640

August 2006

But it disapears... I mean, the dialog disapears, I want it to stay there till I click confirm

James Stanley

Member #7,275

May 2006

Did you read the Allegro GUI Clinic that I linked to? That's a great resource and also where I learnt how to use dialogs. You will need a d_screen_proc (or something like that, I don't remember the name), so that the dialog can keep control of the screen.

When people post pieces of code here, they aren't necessarily tested or complete, and you are likely to have to interpret it or add bits.

EDIT:
It's called a d_clear_proc.

EDIT2:
Or, if you want a function like Input() from Blitz Basic (I highly doubt you've heard of it, but I can't think of another example, it's similar to console input), you would just implement a loop like below, possibly in a function to make it easier to use. This code is untested, incomplete, and is pseudo-code, because I'm not in a programming mood:

while(!character == 10) { //Carriage return
  character = readkey();
  if(!character == 8 /*I _THINK_ that is backspace, check a few other keys as well. Google for an ASCII code table.*/) {
    strcat(theinput, character);
    lettercount++;
  } else {
    theinput[lettercount] = '';
    lettercount--;
  }
}

You might want to add:
A blinking cursor
Arrow Key support
Home/End Key support
Multi-Line support
Anything else I can't think of right now

Derezo

Member #1,666

April 2001

Quote:

I THINK that is backspace

Capture it as an int and use if(character>>8 == KEY_BACKSPACE)
To add the character to the string AND it with 0xFF. Example: theinput[lettercount] = character&0xff;

Or if you're using C++, just use this, which I retrieved using the "search" function:

1#include <allegro.h>
2#include <string>
3using namespace std;
4 
5#define WHITE makecol(255, 255, 255)
6 
7int main()
8{
 // typical Allegro initialization
 allegro_init();
 install_keyboard();
 set_gfx_mode(GFX_AUTODETECT, 320, 240, 0, 0);
13 
 // all variables are here
 BITMAP* buffer = create_bitmap(320, 240); // initialize the double buffer
 string  edittext;                         // an empty string for editting
 string::iterator iter = edittext.begin(); // string iterator
 int     caret  = 0;                       // tracks the text caret
 bool    insert = true;                    // true of should text be inserted
 
 // the game loop
 do
 {
    while(keypressed())
    {
       int  newkey   = readkey();
       char ASCII    = newkey & 0xff;
       char scancode = newkey >> 8;
29 
       // a character key was pressed; add it to the string
       if(ASCII >= 32 && ASCII <= 126)
       {
          // add the new char, inserting or replacing as need be
          if(insert || iter == edittext.end())
             iter = edittext.insert(iter, ASCII);
          else
             edittext.replace(caret, 1, 1, ASCII);
38 
          // increment both the caret and the iterator
          caret++;
          iter++;
       }
       // some other, "special" key was pressed; handle it here
       else
          switch(scancode)
          {
             case KEY_DEL:
                if(iter != edittext.end()) iter = edittext.erase(iter);
             break;
50 
             case KEY_BACKSPACE:
                if(iter != edittext.begin())
                {
                   caret--;
                   iter--;
                   iter = edittext.erase(iter);
                }
             break;
          
             case KEY_RIGHT:
                if(iter != edittext.end())   caret++, iter++;
             break;
          
             case KEY_LEFT:
                if(iter != edittext.begin()) caret--, iter--;
             break;
          
             case KEY_INSERT:
                if(insert) insert = 0; else insert = 1;
             break;
71 
             default:
73 
             break;
          }
    }
    
    // clear screen
    clear(buffer);
80 
    // output the string to the screen
    textout(buffer, font, edittext.c_str(), 0, 10, WHITE);
83 
    // output some stats using Allegro's printf functions
    textprintf(buffer, font,  0, 20, WHITE, "length:   %d", edittext.length());
    textprintf(buffer, font,  0, 30, WHITE, "capacity: %d", edittext.capacity());
    textprintf(buffer, font,  0, 40, WHITE, "empty?:   %d", edittext.empty());
    if(insert)
       textout(buffer, font, "Inserting", 0, 50, WHITE);
    else
       textout(buffer, font, "Replacing", 0, 50, WHITE);
92 
    // draw the caret
    vline(buffer, caret * 8, 8, 18, WHITE);
95 
    // blit to screen
    blit(buffer, screen, 0, 0, 0, 0, 320, 240);
98 
 }while(!key[KEY_ESC]); // end of game loop
 
 // clean up
 destroy_bitmap(buffer);
 set_gfx_mode(GFX_TEXT, 0, 0, 0, 0);
 
 return 0;
106}
107END_OF_MAIN()

Written by 23yrold3yrold.

"He who controls the stuffing controls the Universe"