140 lines
2.7 KiB
C++
140 lines
2.7 KiB
C++
#include <conio.h>
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#include <stdio.h>
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#include <io.h>
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#define ANCHO 80
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#define ALTOini 5
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#define ALTO 20
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#define ARRIBA 72
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#define ABAJO 80
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void MuestraLinea( char Como, char Donde, char *Quien )
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{
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if ( Como )
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{
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textattr( 1 );
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} else {
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textattr( 5 );
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}
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// Borramos la linearrr
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gotoxy( 2, Donde+ALTOini );
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cprintf( "%s", Quien );
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};
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void ObtenLinea( FILE *PT, int LINEA, char *Buffer )
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{
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fseek( PT, sizeof(char)*ANCHO*LINEA, SEEK_SET );
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fread( &Buffer, ANCHO*sizeof(char), 1, PT );
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};
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void PonLinea( FILE *PT, int LINEA, char *Buffer )
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{
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fseek( PT, sizeof(char)*ANCHO*LINEA, SEEK_SET );
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fwrite( &Buffer, ANCHO*sizeof(char), 1, PT );
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};
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void RefreshTexto( FILE *PT, int NLinicio )
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{
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char Buffer[ANCHO+1];
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int i;
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i = 0;
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while ( !feof( PT ) && i < 22 )
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{
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ObtenLinea( PT, (i+NLinicio), Buffer );
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MuestraLinea( 0, i, Buffer );
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i++;
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}
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};
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void PTextos( char *file )
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{
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FILE *PTxt;
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int Lvisual, Lrestante;
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char ok = 0;
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char Buffer[ANCHO+1];
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clrscr();
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if ( ( PTxt = fopen( file, "w+b" ) ) == NULL )
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{
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//--ERROR
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return;
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} else {
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Lvisual = 0;
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Lrestante = 0;
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RefreshTexto( PTxt, Lvisual+Lrestante );
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ObtenLinea( PTxt, Lvisual + Lrestante, Buffer );
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ok = 0;
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do {
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MuestraLinea( 1, Lvisual, Buffer );
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while( !kbhit() );
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MuestraLinea( 0, Lvisual, Buffer );
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switch ( getch() )
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{
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case 27:
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ok = 1;
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break;
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case 0:
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switch ( getch() )
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{
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case ARRIBA:
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Lvisual --;
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if ( Lvisual < 0 )
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{
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Lvisual = 0;
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Lrestante --;
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if ( Lrestante < 0 )
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Lrestante = 0;
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}
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RefreshTexto( PTxt, Lvisual + Lrestante );
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ObtenLinea( PTxt, Lvisual + Lrestante, Buffer );
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break;
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case ABAJO:
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Lvisual ++;
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if ( Lvisual > ALTO )
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{
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Lvisual = ALTO;
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Lrestante ++;
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// Deberias controlar las lineas intermedias, para ponerlas a cero
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}
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RefreshTexto( PTxt, Lvisual + Lrestante );
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ObtenLinea( PTxt, Lvisual + Lrestante, Buffer );
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break;
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}
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default:
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// Editamos la linearrr
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//********************************************************************************
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// EditaLinea( 2, Lvisual, Buffer );
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//********************************************************************************
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sprintf( Buffer, "Linea %d", Lvisual + Lrestante );
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PonLinea( PTxt, Lvisual + Lrestante, Buffer );
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break;
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}
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} while ( !ok );
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fclose( PTxt );
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}
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};
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void main( void )
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{
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PTextos( "Prueba.txt" );
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}
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