ACNews #02 08 июля 2001

Программирование

Programming - the command line TR-DOS.

     - - - - On the command line
| I do not remember when, but I have already offered to echo 
this way. More He casually described in the ZX-Guide # 3.


   He concludes that to facilitate interaction between the 
programs themselves, they will use to call each other command 
line type: 

   RUN "prog", parameter

   Command Line E_LINE - is predetermined by the system
a place to store such parameters. Logical, in my opinion, not
come up with. A comma as a separator chosen for the community 
already existing commands with multiple parameters and our 
challenges. In this case, TR-DOS little interest in the 
contents of the command line after the comma. 

   In AC Edit 0.5S through a line you can specify the name of a 
loaded fayla.Poskolku possible extensions of the files are not 
exhausted by the standard TR-DOS extensions, I decided to do 
without any kind of points and quotes - just specify the name 
of 9 bytes with one word written by the extension ... 

   Implemented this way:

      LD HL, (23641); address kom.stroki E_LINE

      LD BC, 7; the first 7 bytes kom.stroki known to bungle

      ADD HL, BC

      LD A, ",

      CPIR; looking for a comma (because we do not know how 
many letters 

           ; User typed in the title of our program? ;)))

      JR NZ, notFND

      LD DE, 23773; TR-DOS file descriptor

      LD C, 9

      LDIR

      LD C, # A; "search catalog item"

      CALL # 3D13; looking to 9 bytes, because usually (23,814) 
= 9 

      LD A, C; obtain the number of directory entry

      INC C; C = # FF means that the file was not found

      JR Z, notFND

      LD C, 8; "reading directory entry"

      CALL # 3D13
And now the handle at 23773 Old contains about the right file!
; What to do next, now depends on the specific program:

      LD HL, 23773

      CALL PRCDESC +3

      CALL EXTLU

      JR OK
notFND ...

       ...
OK ...


   If you really run the program through the TR-DOS, then (as
found) TR-DOS few converts the string in its
taste: replaces strings, similar to BASIC tokens, the tokens 
themselves. Thus, it is impossible to perform through the 
TR-DOS command such as: 

   RUN "ACEdit5S", AlCoNew2p
And so, you can:

   RUN "ACEdit5S", AlCoNws2p

   Of course, I am aware that no one program is being
in his right mind would not ship another via the command line
TR-DOS. Usually all this happens through protsedurku run BASIC 
file, such as the one that was written BASIL'om (ZX-Guide # 3) 

        LD HL, # YYYY; 16 BYTES INFO

        LD DE, 23773; ABOUT

        LD BC, 16; BASIC FILE.

        LDIR

        LD A, # C9

        LD (23746), A

        LD HL, RNBASIC

        PUSH HL

        LD DE, 23448

        LD BC, END_COD-RNBASIC

        LDIR

        LD HL, 10072; FOR

        EXX; OUTPUT

        LD IY, 23610; In

        IM 1; BASIC.

        EI

        RET
RNBASIC

       DISP 23,448

        LD HL, 23867

        LD DE, 23868

        LD (HL), 0

        LD BC, 41668

        LDIR; Purification of the 48 th MEMORY


        LD A, # 38; PAPER 7

        LD (23693), A; 'INK 0.

        LD (23624), A; and two lower line of the screen are the 
same. 


        LD BC, 65167; CLEAR TO 65167

        CALL 7863, and the maximum length of the file.


        LD HL, 4867; CONNECTION

        PUSH HL;

        LD (23613), SP;

        LD HL, (23631) 48-GO

        LD DE, 15;

        ADD HL, DE;

        LD DE, 5566, BASIC

        EX DE, HL;

        LD BC, 4;

        LDIR; SB 128-TH

        RES 4, (IY +1);

        LD HL, 7030;

        PUSH HL; MEMORY.


        LD HL, RNBAS2

        PUSH HL

        LD HL, 10608;

        PUSH HL;

        LD HL, 10528;

        PUSH HL; LOADING.

        LD HL, 10570;

        PUSH HL;

        JP 15663;

RNBAS2 LD HL, (23649)

        LD A, (HL)

        DEC HL

        LD L, (HL)

        LD H, A

        LD (23618), HL; STRING Auto

        XOR A; Performed

        LD (23620), A; 1-st TEAM.

        RET

       ENT
END_COD

   So, nothing prevents us to launch this form
command line, consisting of a comma and the file name, and 
stick to E_LINE (23,641), its address (or rather, the address 
of 7 less)! | 

                                                   - - - -
------------------- As a dry text;)

   If you really want to get the source code from the previous 
article, we have to remove the control characters. 

   Method # 1 (lamersky):
We go to the Find / Replace and type in the "Enter what to look 
for a" symbol of white (SS / E, 7) Input in the field and what 
to replace the "symbol probela.Nazhimaem Enter. See: Replaced 
OK. Continue the same for the yellow, green, etc. flowers:)))


   Method # 2 (kodersky;)):
Maaalenkuyu write a program that does the same thing, 
perekodiruem through her text, and then erase the program;))) 

   The result can be given at the mercy ALASM 4.42 ...
-------------------------------------------------- -------------