ASM Community

Hi Bit7,

for DOS :

- set DTA addr ---> new DTA ( int 21 - 1a)
- find_first_file and set wildcard your filename ( int 21 - 4eh)
- DTA+0f = starting cluster number of current directory
- DTA+13 = starting cluster number of current directory


For example: (*.com file )

.data



newdta  db 32 dup (?)      ; new DTA

wildcard db 'yourfile.ext',0 ; Your filename here



.code



;org 100h for COM file



 push cs  ; cs=ds=es for DOS segments

 push cs

 pop ds

 pop es



 mov ax,01a00h    ; set DTA new adress 

 lea dx, newdta

 int 21h

 

 mov ah,04eh

 lea dx, wildcard

 mov cx,0ffh       ; Attr  ff= all files and DIR's

 int 21h



 lea dx,newdta+13h  ; current dir 

 ...  

 

for int 21- 04eh : http://www.iro.umontreal.ca/~feeley/cours/ift2240/doc/assembly/int21-4e.html

for int 21 -01ah : http://www.iro.umontreal.ca/~feeley/cours/ift2240/doc/assembly/int21-1a.html

for DTA ( disk transfer adress) : http://www.iro.umontreal.ca/~feeley/cours/ift2240/doc/assembly/dta.html

look this adress for more help:

http://216.26.161.91/vbapi/ref/w/win32_find_data.html
http://www.karbosguide.com/hardware/module6a4.htm
http://www.cybertrails.com/~fys/longfile.htm



Windows FindFirstFile API not included like DOS DTA+0f and DTA+13. Sorry I dont know how to make for Windows. May be DeviceIOControl but i dont try.



have nice days!