Unitech PT600, Programming Reference Manual

Page: 46 / 77

3C
Create File with Handle
Entry Parameter: AH = 3CH
DS:DX ; pointer to file name buffer
Return Value: if success, AX = Handle and CARRY flag is cleared
if failed, AX = 3 and CARRY flag is set
Note: If the file already exists, the function will truncate it to zero
length.
Example:
int TS_create_file(char *fn)
{
regs.h.ah=0x3Ch;
segregs.ds = FP_SEG(fn);
regs.x.dx = FP_OFF(fn);
int86x(0x21,&regs,&regs,&segregs);
if ((regs.x.cflag & 0x01) == 1) return(-1);
else return(regs.x.ax);
}
3D Open File with Handle
Entry Parameter: AH = 3DH
AL = 0 ; read only
1 ; write only
2 ; read and write
DS:DX ; pointer to file name buffer
Return Value: if success, AX = Handle and CARRY flag is cleared
if failed , AX = 2 and CARRY flag is set
Example:
int TS_open_file(char *fn,int mode)
{
regs.h.ah=0x3Dh;
regs.h.al=(unsigned char)mode;
segregs.ds = FP_SEG(fn);
regs.x.dx = FP_OFF(fn);
int86x(0x21,&regs,&regs,&segregs);
if ((regs.x.cflag & 0x01) == 1) return(-1);
else return(regs.x.ax);
}