OpenEuphoria

Deleting a file

• Posted by Architek <architek at GEOCITIES.COM> Apr 28, 1997
• 1153 views

Hi, I've got a problem:
I need to delete a file, but don't want to use the system() function,
cause it has to be "transparent" to the user. So I got this bright
idea of using DOS interrupts (#21). At the end is the code I used, but
it doesn't work... I keep getting DOS error 2 (file not found) and
5 (access denied). Can anyone tell me what is wrong? Is there any
other way to that?
I also needed to copy a file but I solve that with a loop of getc() and
puts() until an EOF.. is there another eficient way?

Thanks.


-------------CUT HERE--------------

-- SYS_DEL()
-- Uses DOS INT #21, service #41 to delete a file given an ASCIIZ filename
-- Returns 1 if succesfull, else return 0 and displays DOS error code

-- INT reference: HelpPC 2.1
function sys_del(sequence filename)
    sequence reg_list
    integer buff

    buff = allocate_low(length(filename)+1)
    poke(buff,filename)
    poke(buff+length(filename),0)

    reg_list = repeat(0,10)

    reg_list[REG_AX] = #4100
    reg_list[REG_DS] = floor(buff/16)
    reg_list[REG_DX] = remainder(buff,16)

    reg_list = dos_interrupt(#21,reg_list)
    free_low(buff)

    if remainder(reg_list[REG_FLAGS],2) != 0 then
        puts(1, "DOS error number :")
        print(1,reg_list[REG_AX])
        puts(1,"\n")
        return 0
    else
        return 1
    end if
end function

--------END OF CODE--------

--

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