Subj : read foregrnd  / backgrnd colors
To   : borland.public.cpp.borlandcpp
From : "Rob C." <robb_christiansen@juno.com>
Date : Tue Aug 26 2003 03:51 pm


OK. So now I have it so the function returns the proper data, 
split up in a character array. Yes it works this way, but as you 
can see it is very clumsy, inelegant code. (And I get some not-
so-good warning messages). There must be a better way! 

For my program below it returns 7420, which is exactly right, 7 
for white background, 4 for red foreground, and 20 (decimal 32) 
for whitespace character. When I run the program with different 
foreground and background colors, again it is absolutely 
correct. 

What I need is to be able to tear the number apart, so I 
have ‘7,’ ‘4,’ and ‘20.’ The value returned is a hexadecimal 
number, however, and that causes problems for me. If it was 
decimal, for example, I could easily convert it to a character 
array and work with the subscripts.  

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

char *readattr(); //<- it says, no protype, but this is it, right?
int   readch();//<- it says, no protype, but this is it, right?

void window(int left, int top, int right, int bottom);
void textbackground(int newcolor);
void clrscr(void);
void gotoxy(int x, int y);

int readch()
{
	struct REGPACK rp = {0};

rp.r_ax = 0x0800;
intr(0x10, &rp);

return rp.r_ax & 0x00ff ;
}

char  *readattr()
{
	FILE *fp;
	struct REGPACK rp = {0};
   char attr[100];

rp.r_ax = 0x0800;
intr(0x10, &rp);

fp = fopen("convert.txt", "wt");
	if (fp == NULL)
     {
     printf("saveattr 42 error open convert.txt for write.\n");
	  getch();
     return 1;
     }
   fprintf( fp, "%x", rp.r_ax );
   fclose(fp);

fp = fopen("convert.txt", "rt");
	if (fp == NULL)
     {
     printf("saveattr 57 error open convert.txt for read.\n");	  getch();
     return 1;
     }
   fscanf( fp, "%s", attr );
   fclose(fp);

return attr; //rp.r_ax; //0x00ff ;
}

int main()
{
		int FG, BG, i, xcol, xrow, col=30, row=10;
      int SAVECOL, SAVEROW;
      char results[10], ch[5];

FG= 4;
BG= 7;
   textcolor(FG);
   textbackground(BG);

gotoxy( col, row-1 );
cprintf( "                                          \n" );

gotoxy( col, row );
cprintf( "   adfyghsfghdvgedhjghjrh \n" );

gotoxy( col, row+1 );
cprintf( "   adfyghsfghdvgedhjghjrh \r\n" );

gotoxy( col, row+2 );
cprintf( "   adfyghsfghdvgedhjghjrh \n" );

gotoxy( col, row+3 );
cprintf( "                          \n" );

xcol=5;
xrow=1;
SAVECOL = col;
SAVEROW = row;

while(1)
{ //94
gotoxy( col, row );

strcpy( results, readattr() ); // col, row ) );
i = readch();
sprintf( ch, "%d", i );

gotoxy( xcol, xrow );
cprintf( "  Background = '%c' \n", results[0] );

gotoxy( xcol, xrow+1 );
cprintf( "  Foreground = '%c' \n", results[1] );

gotoxy( xcol, xrow+2 );
cprintf( "  character =  '%s'\n", ch );

textcolor(3);
gotoxy( col, row );
cprintf( "%c\r\n", i );

   getch();

textcolor(FG);
gotoxy( col, row );
cprintf( "%c\r\n", i );

col++;
if( i == '\0' )
{
col = SAVECOL;
row++;
}

} //94

return;

}

.