发信人: kingfox()
整理人: wenbobo(2002-08-13 10:45:44), 站内信件
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【 在 jamwang (雨后) 的大作中提到: 】
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int86, int86x? <DOS.H>
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General 8086 software interrupt interfaces
Declaration:
?int int86(int intno, union REGS *inregs, union REGS *outregs);
?int int86x(int intno, union REGS *inregs, union REGS *outregs,
struct SREGS *segregs);
Remarks:
int86 and int86x execute an 8086 software interrupt specified by the
argument intno.
With int86x, you can invoke an 8086 software interrupt that takes a va
lue o
DS different from the default data segment, and/or takes an argument i
n ES.
Before the interrupt
------------------------
Before executing the software interrupt, these functions copy register
values from inregs into the registers.
int86x also copies the segregs->ds and segregs->es values into the
corresponding registers before executing the software interrupt.
This feature allows programs that use far pointers or a large data mem
ory
model to specify which segment is to be used for the software interrup
t.
After the interrupt
------------------------
After the software interrupt returns, these functions copy the followi
ng:
?current register values to outregs
?status of the carry flag to the x.cflag field in outregs
?value of the 8086 flags register to the x.flags field in outregs
int86x also restores DS and sets the segregs->es and segregs->ds field
s to
the values of the corresponding segment registers.
If the carry flag is set, it usually indicates that an error has occur
red.
>>NOTE: inregs can point to the same structure that outregs points to.
Return Value:
Both functions return the value of AX after completion of the software
interrupt.
If the carry flag is set, indicating an error (outregs -> x.cflag != 0
),
these functions set _doserrno to the error code.
Examples:
int86 example
-------------------------
#include <stdio.h>
#include <conio.h>
#include <dos.h>
#define VIDEO 0x10
void movetoxy(int x, int y)
{
union REGS regs;
regs.h.ah = 2; /* set cursor position */
regs.h.dh = y;
regs.h.dl = x;
regs.h.bh = 0; /* video page 0 */
int86(VIDEO, ®s, ®s);
}
int main(void)
int86 example
哌哌哌哌哌哌哌?
#include <stdio.h>
#include <conio.h>
#include <dos.h>
#define VIDEO 0x10
void movetoxy(int x, int y)
{
union REGS regs;
regs.h.ah = 2; /* set cursor position */
regs.h.dh = y;
regs.h.dl = x;
regs.h.bh = 0; /* video page 0 */
int86(VIDEO, ®s, ®s);
}
int main(void)
int86 example
哌哌哌哌哌哌哌?
#include <stdio.h>
#include <conio.h>
#include <dos.h>
#define VIDEO 0x10
void movetoxy(int x, int y)
{
union REGS regs;
regs.h.ah = 2; /* set cursor position */
regs.h.dh = y;
regs.h.dl = x;
regs.h.bh = 0; /* video page 0 */
int86(VIDEO, ®s, ®s);
}
int main(void)
{
clrscr();
movetoxy(35, 10);
printf("Hello\n");
return 0;
}
--
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