Amiga Computing - Commodore Is Awesome

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n recent instalments I've been discussing a number of coding approaches involving console device control character sequences and by last month, these had found their way into a program that set up a screen form. This allowed data to be entered and collected from a set of predefined 'fields' on the screen. I drew your attention to the fact that this preliminary script used independent statements for setting up and collecting data from each field (see listing I) and hinted that there is a far better approach available. The trick, of course, IS to use stem-based compound variables to represent field names, row and column screen position co-ordinates, and lengths of reply fields, and it is this arrangement that I want to deal with this month. A compound variable data table is going to be used to store the values required for the CursorWritell, Showlnputfield() and CursorRead(' routines of the existing script. Listing 2 shows the new data table and thc key thong to notice is that the field numbers It looking good but... Despite the improvements with this month's script there is, however, still one area that provides a potential trouble spot. It concerns seine of the static definitions used within the example code. You'll notice that. where procedures (I.e. AFtexx functions with their own symbol tables and execution environments) are being used, some items (for example, (SC and all have to be defined in more than one place. Despite procedural isolation being, In the main, a very good thing, the fact that 'pseudoonstant definitions, which are deliberately intended to be global, are blocked and have to be redefined within each procedure that uses them is unfortunate. As always there is a way around this difficulty. but I'm afraid you'll have to wait until next month to find out what it lit Cuing In1J Mu *b r a. S t Please safe , t a w S o l l e Sw rammd. • 8 1 . 4 a l a W M o t o c a p o P a I m m o ! l l p l 14 tom teal SOW TOM leMEMMENI m i t e : i l l NMI• 1 I Wo rtb o o tt ' r o w a n n o d now form part of the compound variable tails. The immediate benefit here is that do/end type loops can now be used to perform all forms of setting up and data collection operations. For example the field names and cleared reply fields can now be produced using the code shown in listing 3 Because these loop-based routines, along with others that you'll find on this months example script, can handle any number of field items, this means that no matter how complex a form definition you decide to use, these routines will be able to handle it S t e . I S • • 1101 te ttiolat J be Vie mist tn (HICO MftPt tint IWN) pq This inonth's script displa y may look much like tha t he m Mat month, but underneath the surfa ce a n awful lot ha s changstd! of form 'records' to be stored. has been added. At the moment, however, all that happens is that a 'dummy save routine gets called and, as each record is selected for storage. the form data just gets written back to the Shell window las a sort of 'visible prompt' to confirm that something is happening)! As the entenng of each set of information is completed, the script will ask if you want to store the current record or not, and whether you want to enter further data. All these things are achieved with fairly mundane use of a CursorWhtel) routine using these types of statements: Input data can also now be collected using compound variables, with the contents of each completed form, i.e. a complete input record', forming part of a single compound variable set =NNW call Curoorldriteraw_windov,22,C,SCUEN_PROPPTS) (replyS.i) Needless to say this, compared to the la.teadthifaii_windold,U relatively simple approach used last month, is a big improvement. if Opper(0)...1' then call Savelataf) When you run this month's example (by Another improvement to be found on this typing rx october_example at a Shell window) a months offering is that if, at any time while form pretty much the same as that used in the entering information, you want to scrap the previous instalment's code is produced currently displayed data, you can now Just hit chose, incidentally, to keep the form description the Escape key to clear the form and return to the same in order to allow easy comparison the first data input Meld again. In order to do with the field definition approach used last this I've had to modify the CursorReadt) routine month. Underneath the surface, so that it detects when The ESCape key is call Curscrarittirow_viadoo,10,4,f1ELDI call Cursofariteraii_kiindok,10,3d,l1ELD?) call Corsafarittlfoli_ call tufsorWfitetrom_ dirichra,14,4,FIELD4) colt Cursoilriteraw_irloidda,16,4,FIELD5) ciii Cursoraritelfaa_aindov,18,4,F11.06) call Cursordrittiraw_mindov,20,4,f1E107) however, you'll see that quite a lot of code has changed, and as well as implementing the compound variable loop tricks already mentioned, some preliminary code, to allow any number pressed. Because of the way the routine was designed. this was quite easy to do and simply involved defining an ESC variable (as the value 'lax) and adding an additional ESC case to the routine's SelectArlhen statements. call Showin5utlielerow_window,10,a call 4ShoiladotrieldlroiLaindow,10Cattooth(FIEL call tanoth(fi 12 Satiminputfieldl Ettlitt, raw_windov,12,a+leng8 if ill.D3)+1,31) call 16 )al,?) SbouleputFitiC raii_nindew,14,4+Linglii(FIELD4)+1,31) cell StioNtripACit ren_eindow,16 colt ) •5tindiniNtileterme_gindev,10,4*Length(f 111.0610,10) call 4+LengtEMLOS)+1,3 Shaatroputfittalria_iirodaidD,4•Lensti(littinti,10) 1 Listing to La st month's program e ffe ctive ly treated e a ch fie ld a s a n inde pe nde nt ite m bisplayfore: do lei to FIELI_COMIT coil Curcoratite(raw_iiindow,f.i.f,f,i.c,f.i.naae) trod ttearfors: do 1.1 to FIELO_COUNT ) FIELLCOUNTo7 f.l.niao.lormasei ; f.i.f , flasaWinflielo: '; 1.2.r.10; f.2. 10; f.3.nomec'addrosi: f . • ; f.3.r.12; f.3.c. , f.4.nale.' ' ; f.4.r.14; f.4.co4; f.5.naaa.' ' ; f.5.r.16; f.5.c.4; f.e.nama 0f.l.nolie.'Iticalione:'; f.1.r Postcod . • .l.la fa.L.f 1.3.l..37 1.4,1=31 f.S.I.37 f.6.L.10 f.7.1.10 1111 Listing 2 : The ne w styli* li compound va ria ble H e ld de finHions call Showloputfieldirom_vindood.1.f,I.i.cflangthil.l.ma 1i.i.L) end ti. 1 return , 1 Listing 3 : Compound va ria ble s a llow short loops like those to ha ndle a ny numbe r of forrn se tting up a nd re a ding ope ra tions e: 20; f . l . c z a ; ' ; f . d . Amiga Computing OCTOBER 1995 • • • • • • • • •• • • • • • •• • Paul Oueraa °dim a ORM tridi for 5etting up ARPHH Men form de5rlotion5 111
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Amiga Computing - Commodore Is Awesome

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