{"id":183470,"date":"2022-07-30T17:28:14","date_gmt":"2022-07-30T17:28:14","guid":{"rendered":"https:\/\/www.actcom.dk\/med-30-linjer-over-netvaerket\/"},"modified":"2023-08-18T11:18:32","modified_gmt":"2023-08-18T11:18:32","slug":"med-30-linjer-over-netvaerket","status":"publish","type":"post","link":"https:\/\/www.actcom.dk\/da\/med-30-linjer-over-netvaerket\/","title":{"rendered":"Med 30 linjer over netv\u00e6rket:"},"content":{"rendered":"
\n

En af de nemmeste muligheder for at etablere forbindelser via et netv\u00e6rk er tilg\u00e6ngelig med Microsoft Visual Basic, version 5.0 eller nyere. Selv uden ekspertviden om netv\u00e6rk vil du v\u00e6re i stand til at overf\u00f8re data over netv\u00e6rket;\u00a0her<\/span><\/a> kan du finde vores lille pr\u00f8veprogram. Du vil snart se, at 30 linjer kildetekst og vores sm\u00e5 adaptere er tilstr\u00e6kkelige til at overf\u00f8re serielle data via LAN \/ WAN.<\/p>\n

\"\"<\/a><\/p>\n

Programmeringen af disse API’er er endnu mindre kompliceret, end den almindelige funktion kr\u00e6ver integration af en COM-port, da hele kompleksiteten af netv\u00e6rksmekanismerne er pakket ind i Socket Port.<\/p>\n

De diagonale pile angiver, hvordan klient- og serverprogrammerne arbejder sammen. Alt du skal g\u00f8re er at implementere et program, afh\u00e6ngigt af om Com-Server skal betjenes i henholdsvis klient- eller servertilstand.<\/p>\n

Server Eller Klient?<\/h3>\n

Som TCP-klient er Com-Server i stand til uafh\u00e6ngigt at etablere en forbindelse, n\u00e5r data skal overf\u00f8res, og til at afbryde forbindelsen, n\u00e5r dataoverf\u00f8rslen er afsluttet. Mens der ikke oprettes forbindelse til en anden server, kan Com-Server ogs\u00e5 fungere som en server ved at acceptere forbindelsesanmodninger fra andre klienter.<\/p>\n

Ingen specielle indstillinger er n\u00f8dvendige for at betjene Com-Server som en TCP-server. I dette tilf\u00e6lde styres forbindelsen af din klientproces, dvs. at du b\u00e5de etablerer og afslutter forbindelsen. N\u00e5r en forbindelse er etableret, kan data udveksles mellem de to processer. Com-Serveren overf\u00f8rer dataene fra netv\u00e6rket til den serielle port eller I\/O-portene og l\u00e6ser data fra den serielle port eller I\/O-portene for at g\u00f8re dem tilg\u00e6ngelige for klientprocessen.<\/p>\n

TCP Eller UDP?<\/h3>\n

TCP er en forbindelsesbaseret protokol; mens data overf\u00f8res, er der en fast, logisk forbindelse mellem klient og server. TCP indeholder alle de mekanismer, der er n\u00f8dvendige for at \u00e5bne en forbindelse, sikre fejlfri dataoverf\u00f8rsel over netv\u00e6rket og derefter lukke forbindelsen. Her opretter og administrerer protokolstakken dedikerede buffere for hver forbindelse. Bem\u00e6rk, at hvis mange com-servere skal tilg\u00e5s fra en computer, kan du i ekstreme tilf\u00e6lde n\u00e5 en hukommelsesgr\u00e6nse.<\/p>\n

I mods\u00e6tning hertil indeholder UDP ikke mekanismerne til at gentage datapakker eller kontrollere dem for fuldst\u00e6ndighed. Dataoverf\u00f8rsel ved hj\u00e6lp af UDP anbefales, n\u00e5r der allerede er en v\u00e6rtsprotokol til sikring af fejlfri transmission mellem terminalenheden p\u00e5 Com-Server og applikationen p\u00e5 TCP \/ IP-stationen, eller n\u00e5r et stort antal netv\u00e6rksstationer skal tilg\u00e5s samtidigt.<\/p>\n

De (undertiden vigtige) s\u00e6rlige tilf\u00e6lde
\nFor dem, der g\u00f8r brug af socket-programmering, leverer Com-Server kontrol- og serviceporte, der giver mulighed for yderligere funktioner, som kan aktiveres parallelt med dataoverf\u00f8rslen i form af serverprocesser. Dette giver dig mulighed for f.eks. fjernkonfiguration og vedligeholdelse af enheden. Du kan finde flere oplysninger om dette emne i del 6\u00a0i Com-Server-manualen.<\/span><\/a><\/p>\n

G\u00e5 til eksempel<\/a><\/span><\/p>\n

Her ses relevante produkter:<\/h3>\n

{module title=”WT58461″}<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\n

Med 30 linjer over netv\u00e6rket: TCP \/ IP-port som en programmeringsgr\u00e6nseflade.<\/h3>\n

Med socket-API ‘en (f.eks. Winsock under Windows eller Berkely Sockets under UNIX) kan mange forskellige applikationer realiseres inden for din eksisterende software. API tilbyder alle funktioner til dataoverf\u00f8rsel via netv\u00e6rket.<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[437],"tags":[385],"class_list":["post-183470","post","type-post","status-publish","format-standard","hentry","category-applikationer-for-com-server","tag-comserver"],"acf":[],"yoast_head":"\nTCP\/IP port, RS232, RS422, RS485<\/title>\n<meta name=\"description\" content=\"Med 30 Linjer Over Netv\u00e6rket: TCP \/ IP-Stik Som En Programmeringsgr\u00e6nseflade\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.actcom.dk\/da\/med-30-linjer-over-netvaerket\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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