Paxar Gold 6037EX - Manual (Page 140)

4-104 Programmer’s Manual
v i d R e a d C A
Description
Reads a character and attribute from the current cursor location
for the specified display page.
Syntax
void far vidReadCA(unsigned char far* lpuchChr,
unsigned char far* lpuchAttr,
short sPage);
Parameters
lpuchChr A variable pointer to the character.
lpuchAttr A variable pointer to the character’s attribute.
Returned values are:
0x07 Normal video
0x70 Reverse video
sPage The display page. For 4-row printers, values are 0-
3. For 8-row printers, values are 0-1.
Return Values
None
Example
#include <stdio.h>
#include "mmsultra.h"
void main(void)
{
unsigned char ucCharacter = 32; // Character at position
unsigned char ucAttribute = 32; // Attribute at position
vidSetPage(0); // Set page
vidPutCursor(0, 0, 0); // Move cursor
// Read char and
// attribute
vidReadCA(&ucCharacter, &ucAttribute, 0);
vidScroll(0, 0, 7, 19, 0, 0x07); // Clear screen