Unitech PT600, Programming Reference Manual

Page: 48 / 77

Entry Parameter: AH = 40H
BX = Handle of file
CX = number of bytes to write
DS:DX ; pointer to data buffer
Returned Value: if success, AX = number of written bytes and
CARRY flag is cleared
if failed, AX = 6 and CARRY flag is set
Example:
int TS_write_file(int hdl,int cnt,char *str)
{
segregs.ds = FP_SEG(str);
regs.x.dx = FP_OFF(str);
regs.h.ah=0x40;
regs.x.bx=hdl;
regs.x.cx=cnt;
int86x(0x21,&regs,&regs,&segregs);
if ((regs.x.cflag & 0x01) == 0) return(regs.x.ax);
else return(-1);
}
41
Delete File
Entry Parameter: AH = 41H
DS:DX ; pointer to file name buffer
Return Value: if success, CARRY flag is cleared
if failed, AX = 2 and CARRY flag is set
Example :
int TS_delete_file(char *fn)
{
TD_intdos_O(0x41,0,fn);
if ((regs.x.cflag & 0x01) == 0) return(1);
else return(-1);
}
42 Move File Pointer
Entry Parameter: AH = 42H
AL = 0 ; offset from beginning
1 ; offset from current
2 ; offset from end