Microsoft Programmer's Library 1.3

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Text File | 1985-11-22 | 9.5 KB | 595 lines

CRT FILE UTILITIES LIBRARY FUNCTIONS NAME cursor Position the screen cursor at passed location SYNOPSIS int cursor(x,y) int x, /* X coordinate for cursor position */ y; /* Y coordinate for cursor position */ FUNCTION Force the IBM PC cursor to the specified location. Works through direct BIOS calls, (int 10). NOTE the order of cursor address is X,Y where x is the horizontal position and y the vertical. RETURNS Nothing. EXAMPLE { int x,y; x = 0; y = 10; cursor(x,y); /* move cursor to beginning line 10 */ cursor(40,12); /* move cursor to center of screen */ } SEE ALSO erase, clr_from, clrline 1 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME erase Clear the entire screen SYNOPSIS int erase() FUNCTION Erase the entire IBM PC screen. Note this is done through direct BIOS calls to int 10. RETURNS Nothing. EXAMPLE { erase(); /* screen is now clear */ } SEE ALSO cursor, clr_from, clrline 2 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME clr_from Clear the screen from the x,y position down SYNOPSIS int clr_from(x,y) int x, /* X coordinate for start of erase */ y; /* Y coordinate for start of erase */ FUNCTION Used to erase to the end of the screen. This routine uses direct BIOS calls to int 10. Note also that the X coordinate should be 0 or strange things may happen, since the erase is done by scrolling a window on the screen. RETURNS Nothing. EXAMPLE { int x,y; cursor(0,10),printf("hello there"); cursor(0,20),printf("Only this line will be erased"); clr_from(0,15); /* screen is cleared from 0,15 to 79,24 */ } SEE ALSO cursor, erase, clrline 3 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME clrline Clear the screen to the end of this line SYNOPSIS int clrline() FUNCTION Clear to end of line function. Locates current cursor position and clears screen from there to end of the line. Uses direct BIOS calls to int 10. RETURNS Nothing. EXAMPLE { erase(); cursor(0,10),printf("Hello world, how are you doing?"); cursor(11,10); clrline(); /* erases ", how are you doing?" */ } SEE ALSO cursor, erase, clr_from 4 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME beep Sound the speaker at a low frequency SYNOPSIS int beep() FUNCTION Sets the speaker frequency to a pleasant low tone and "beeps" for about a quarter second. This function uses direct access to IBM PC hardware ports. The beep is used for error responses in the data field handler routines. RETURNS Nothing. EXAMPLE { /*-- if the value is good return so, else tell them its bad -*/ if (a > b) return(ok); else { beep(); return(bad); } } 5 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME box Draw a box using IBM block graphics on screen SYNOPSIS int box(ulx,uly,lrx,lry) int ulx, /* upper left hand X coordinate of box */ uly, /* upper left hand Y coordinate of box */ lrx, /* lower right hand X coordinate of box */ lry; /* lower right hand Y coordinate of box */ FUNCTION Draw a box using IBM PC block graphics characters on the screen. You must pass the routine the upper left hand corner of the box and the lower right hand corner of the box. This routine use the bdos library function to perform its work. RETURNS Nothing. EXAMPLE { box(0,0,79,24); /* draw a box around the whole screen */ box(10,10,20,20); /* draw a smaller box inside the first */ } SEE ALSO hline, vline 6 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME hline Draw a horizontal line SYNOPSIS int hline(character,length) int character, /* character to send to the screen (8 bits) */ length; /* number of characters to draw */ FUNCTION Draw a horizontal line using the passed character and length. This function is useful in finishing off boxes, or ruling off areas in them. Uses the bdos library function. It draws from the left of the screen to the right. RETURNS Nothing. EXAMPLE { box(0,0,79,24); /* draw a big box */ cursor(30,1),printf("M E N U T I T L E"); cursor(0,2),bdos(6,204,0); /* wall of a title block */ hline(205,78); /* inside the box */ bdos(6,185,0); } SEE ALSO box, vline 7 CRT FILE UTILITIES LIBRARY FUNCTIONS NAME vline Draw a vertical line on the screen SYNOPSIS int vline(x,y,character,length) int x, /* X coordinate to start */ y, /* Y coordinate to start */ character, /* character to use (int) */ length; /* number of characters to draw */ FUNCTION Draw a vertical line on the screen. You tell it the starting X and Y address, the character to draw, and the length of the line. The routine uses bdos library function calls. It draws from the top of the screen down. RETURNS Nothing. EXAMPLE { erase(); vline(40,0,186,25); /* divide the screen in half with a */ /* double line character */ } SEE ALSO box, hline 8 CRT FILE UTILITIES LIBRARY FUNCTIONS Lattice Utilities These object file utilities are being distributed at no charge to all people who are interested in obtaining them. The BBS form of these files includes only the large code - large data model (-ml) object files and matching documentation. If these utilities sound interesting try them out. We will supply the source code on an IBM PC DSDD disk to these utilities, so you can use any of the four memory models, for a price of $25.00. Users of this software may incorporate it into any product they desire. There is no charge for this. You may NOT sell this package by itself in any form what so ever. The only exceptions to this are a limited distribution fee for Clubs and or Users Groups not to exceed $10.00 per disk. Warranty NONE! We are not responsible or liable for any damages either real or consequential. This package is free after all. Note that this software has been running in several different commercial packages for three years now so it must do something right. Copyright 1983, 1984, 1985 by Elfring Consulting, Inc. All rights reserved Full source code is available for $25.00 from: Elfring Consulting, Inc. 4N899 W. Mary Drive St. Charles, Illinois 60174 312-377-3520 9