Chapter 21: Connecting with a Network

Transcription

1 Pag 319 This chap discusss how o us h BASIC-256 wokig sams. Nwokig i BASIC-256 will allow fo a simpl "sock" cocio usig TCP (Tasmissio Cool Poocol). This chap is o ma o b a full ioducio o TCP/IP sock pogammig. Sock Cocio: TCP sam socks ca a cocio bw wo compus o pogams. Packs of ifomaio may b s ad civd i a bidicioal (o wo way) ma ov h cocio. To sa a cocio w d o compu o pogam o ac as a sv (o wai fo h icomig lpho call) ad h oh o b a cli (o mak h lpho call). Illusaio 40 shows gaphically how a sam cocio is mad. 1. Sv Cli 1. Sv liss fo cli o coc 2. Cli cocs o po 3. Bi-dicioal (2-way) commuicaio bw cli ad sv. Illusaio 40: Sock Commuicaio 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

2 Pag 320 Jus lik wih a lpho call, h pso makig h call (cli) ds o kow h pho umb of h pso hy a callig (sv). W call ha umb a IP addss. BASIC-256 uss IP vsio 4 addsss ha a usually xpssd as fou umbs spaad by piods (A.B.C.D) wh A, B, C, ad D a ig valus fom 0 o 255. I addiio o havig h IP addss fo h sv, h cli ad sv mus also alk o ach-oh ov a po. You ca hik of h po as a lpho xsio i a lag compay. A pso is assigd a xsio (po) o asw (sv) ad if you wa o alk o ha pso you (cli) call ha xsio. Th po umb may b bw 0 ad bu vaious I ad oh applicaios hav b svd pos i h ag of I is commdd ha you avoid usig hs pos. A Simpl Sv ad Cli: c21_simplsv.kbs sd a mssag o h cli o po 999 pi "lisig o po 9999 o " + addss() NLis 9999 NWi "Th simpl sv s his mssag." NClos Pogam 129: Simpl Nwok Sv c21_simplcli.kbs coc o simpl sv ad g h mssag ipu "Wha is h addss of h simpl_sv?", add$ if add$ = "" h add$ = " " 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

3 7 8 9 Pag 321 NCoc add$, 9999 pi NRad NClos Pogam 130: Simpl Nwok Cli lisig o po 9999 o xx.xx.xx.xx Sampl Oupu 129: Simpl Nwok Sv Wha is h addss of h simpl_sv? Th simpl sv s his mssag. Sampl Oupu 130: Simpl Nwok Cli addss addss ( ) Fucio ha us a sig coaiig h umic IPv4 wok addss fo his machi. lis lis lis lis poumb ( poumb ) sockumb, poumb ( sockumb, poumb ) Op up a wok cocio (sv) o a spcific po addss ad wai fo aoh pogam o coc. If sockumb is o spcifid sock umb zo (0) will b usd Jams M. Rau (CC BY-NC-SA 3.0 US)

4 Pag 322 clos clos ( ) clos sockumb clos ( sockumb ) Clos h spcifid wok cocio (sock). If sockumb is o spcifid sock umb zo (0) will b closd. wi wi wi wi sig ( sig ) sockumb, sig ( sockumb, sig ) Sd a sig o h spcifid op wok cocio. If sockumb is o spcifid sock umb zo (0) will b wi o. coc coc coc coc ) svam, poumb ( svam, poumb ) sockumb, svam, poumb ( sockumb, svam, poumb Op a wok cocio (cli) o a sv. Th IP addss o hos am of a sv a spcifid i h svam agum, ad h spcific wok po umb. If sockumb is o spcifid sock umb zo (0) will b usd fo h cocio Jams M. Rau (CC BY-NC-SA 3.0 US)

5 Pag 323 ad ad ( ) ad ( sockumb ) Rad daa fom h spcifid wok cocio ad u i as a sig. This fucio is blockig (i will wai uil daa is civd). If sockumb is o spcifid sock umb zo (0) will b ad fom. Nwok Cha: This xampl adds o w fucio (daa) o h wokig sams w hav alady ioducd. Us of his w fucio will allow ou wok clis o pocss oh vs, lik kysoks, ad h ad wok daa oly wh h is daa o b ad. Th wok cha pogam (Eo: Rfc souc o foud) combis h cli ad sv pogam io o. If you sa h applicaio ad i is uabl o coc o a sv h o is appd ad h pogam h bcoms a sv. This is o of may possibl mhods o allow a sigl pogam o fill boh ols c21_cha.kbs us po 9999 fo simpl cha ipu "Cha o addss (u fo sv o local hos)?", add$ if add$ = "" h add$ = " " y o coc o sv - if h is o o bcom o y NCoc add$, 9999 cach 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

6 Pag 324 pi "saig sv - waiig fo cha cli" NLis 9999 d y pi "cocd" whil u g ky pssd ad sd i k = ky if k <> 0 h call show(k) wi sig(k) g ky fom wok ad show i if NDaa() h k = i(nrad()) call show(k) paus.01 d whil d suboui show(kyvalu) if kyvalu= h pi ls pi ch(kyvalu); d suboui Pogam 131: Nwok Cha Th followig is obsvd wh h us o h cli yps h mssag "HI SERVER" ad h h us o h sv yps "HI CLIENT". Cha o addss (u fo sv o local hos)? saig sv - waiig fo cha cli 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

7 Pag 325 cocd HI SERVER HI CLIENT Sampl Oupu 131.1: Nwok Cha (Sv) Cha o addss (u fo sv o local hos)? cocd HI SERVER HI CLIENT Sampl Oupu 131.2: Nwok Cha (Cli) daa o daa() daa ( sockumb ) Rus u if h is wok daa waiig o b ad. This allows fo h pogam o coiu opaios wihou waiig fo a wok pack o aiv. Th big pogam his chap cas a wo play wokd ak bal gam. Each play is h whi ak o hi sc ad h oh play is h black ak. Us h aow kys o oa ad mov. Shoo wih h spac ba. 1 c21_bal.kbs 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

8 Pag 326 uss po 9998 fo sv spidim 4 call akspi(0,whi) m call akspi(1,black) oppo call pojcilspi(2,blu) my sho call pojcilspi(3,d) oppo sho kspac = 32 klf = kigh = kup = kdow = d = pi / 20 dxy = 2.5 mov shodxy = 5 po = 9998 pi pi pi pi pi dicio chag spd sho mov spd po o commuica o "Tak Bal - You a h whi ak." "You missio is o shoo ad kill h" "black o. Us aows o mov ad" "spac o shoo." ipu "A you h sv? (y o )", mod$ if mod$ = "y" h pi "You a h sv. Waiig fo a cli o coc." NLis po ls ipu "Sv Addss o coc o (u fo local hos)?", add$ if add$ = "" h add$ = " " NCoc add$, po s my dfaul posiio ad sd o my oppo x = Jams M. Rau (CC BY-NC-SA 3.0 US)

9 Pag 327 y = 100 = 0 pojcil posiio dicio ad visibl p = fals px = 0 py = 0 p = 0 call wiposiio(x,y,,p,px,py,p) upda h sc colo g c 0, 0, gaphwidh, gaphhigh spishow 0 spishow 1 spiplac 0, x, y, 1, whil u g ky pssd ad mov ak o h sc k = ky if k <> 0 h if k = kup h x = ( gaphwidh + x + si() * dxy ) % gaphwidh y = ( gaphhigh + y - cos() * dxy ) % gaphhigh if k = kdow h x = ( gaphwidh + x - si() * dxy ) % gaphwidh y = ( gaphhigh + y + cos() * dxy ) % gaphhigh if k = klf h = - d if k = kigh h = + d if k = kspac h p = px = x py = y p = u 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

10 Pag 328 spishow 2 spiplac 0, x, y, 1, call wiposiio( x, y,, p, px, py, p ) if spicollid( 0, 1 ) h wi "F" pi "You jus a io h oh ak ad you boh did. Gam Ov." d mov my pojcil (if h is o) if p h px = px + si( p ) * shodxy py = py - cos( p ) * shodxy spiplac 2, px, py, 1, p if spicollid( 1, 2 ) h NWi "W" pi "You killd you oppo. Gam ov." d if px < 0 o px > gaphwidh o py < 0 o py > gaphhigh h p = fals spihid 2 call wiposiio( x, y,, p, px, py, p ) g posiio fom wok ad s locaio vaiabls fo h oppo flip h coodias as w dcod whil NDaa() posiio$ = NRad() whil posiio$ <> "" if lf(posiio$,1) = "W" h pi "You Did. - Gam Ov" d 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

11 Pag 329 if lf(posiio$,1) = "F" h pi "You w hi ad you boh did. Gam Ov" d op_x = gaphwidh - upad( f( posiio$ ), 3) op_y = gaphhigh upad( f( posiio$ ), 3) op_ = pi + upad( f( posiio$ ), 5) op_p = upad( f( posiio$ ), 1) op_px = gaphwidh upad( f( posiio$ ), 3) op_py = gaphhigh upad( f( posiio$ ), 3) op_p = pi + upad( f( posiio$ ), 5) display oppo spiplac 1, op_x, op_y, 1, op_ if op_p h spishow 3 spiplac 3, op_px, op_py, 1, op_p ls spihid 3 d whil d whil paus.05 d whil suboui wiposiio(x,y,,p,px,py,p) posiio$ = lpad$( i( x ), 3 ) + lpad$ ( i( y ), 3 ) + lpad$(, 5 ) + lpad$( p, 1 ) + lpad$( i( px ), 3 ) + lpad$( i( py ), 3 ) + lpad$ ( p, 5 ) NWi posiio$ d suboui fucio lpad$(, l ) 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

12 Pag 330 u a umb lf paddd i spacs s$ = lf(, l ) whil lgh( s$ ) < l s$ = " " + s$ d whil u s$ d fucio fucio upad( f( l$ ), l ) u a umb a h bgiig paddd i l spacs ad sho h sig by l ha w jus pulld off = floa( lf( l$, l ) ) if lgh( l$ ) > l h l$ = mid( l$, l + 1, ) ls l$ = "" u d fucio suboui akspi( spiumb, c ) colo c spipoly spiumb, {0,0, 7,0, 7,7, 14,7, 20,0, 26,7, 33,7, 33,0, 40,0, 40,40, 33,40, 33,33, 7,33, 7,40, 0,40} d suboui suboui pojcilspi( spiumb, c) colo c spipoly spiumb, {3,0, 3,8, 0,8} d suboui Pogam 132: Nwok Tak Bal 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

13 Pag 331 Sampl Oupu 43: Addig Machi - Usig Exi Whil Exciss: m j v p k v h d f k x d c i w l p i o l o i c o s c s a v x w i k d v g p g k c o m s o l c c o c cli, lis, clos, coc, lis, ad, wok, wi, po, sv, sock, cp 2014 Jams M. Rau (CC BY-NC-SA 3.0 US)

14 Pag Modify Poblm 12.4 o ca a wok cli/sv 2 play pig-pog gam Wi a simpl sv/cli ock-pap-scissos gam wh wo plays will comp Wi a complx wok cha sv ha ca coc o sval clis a oc. You will d a sv pocss o assig ach cli a diff po o h sv fo h acual cha affic Jams M. Rau (CC BY-NC-SA 3.0 US)