120 lines
3.5 KiB
Go
120 lines
3.5 KiB
Go
// This file is part of https://github.com/racingmars/go3270/
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// Copyright 2020 by Matthew R. Wilson, licensed under the MIT license. See
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// LICENSE in the project root for license information.
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package main
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import (
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"fmt"
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"net"
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"os"
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"github.com/racingmars/go3270"
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)
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func init() {
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// put the go3270 library in debug mode
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go3270.Debug = os.Stderr
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}
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// A Screen is an array of go3270.Field structs. We will build two screens,
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// a query screen and a result screen:
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var screen1 = go3270.Screen{
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{Row: 0, Col: 27, Intense: true, Content: "3270 Example Application"},
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{Row: 2, Col: 0, Content: "Welcome to the go3270 example application. Please enter your name."},
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{Row: 4, Col: 0, Content: "First Name . . ."},
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{Row: 4, Col: 19, Name: "fname", Write: true},
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{Row: 4, Col: 40}, // field "stop" character
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{Row: 5, Col: 0, Content: "Last Name . . . ."},
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{Row: 5, Col: 19, Name: "lname", Write: true},
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{Row: 5, Col: 40}, // field "stop" character,
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{Row: 7, Col: 0, Content: "Press"},
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{Row: 7, Col: 6, Intense: true, Content: "enter"},
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{Row: 7, Col: 12, Content: "to submit your name."},
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{Row: 22, Col: 0, Content: "PF3 Exit"},
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}
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var screen2 = go3270.Screen{
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{Row: 0, Col: 27, Intense: true, Content: "3270 Example Application"},
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{Row: 2, Col: 0, Content: "Thank you for submitting your name. Here's what I know:"},
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{Row: 4, Col: 0, Content: "Your first name is"},
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{Row: 4, Col: 19, Name: "fname"}, // We're giving this field a name to replace its value at runtime
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{Row: 5, Col: 0, Content: "And your last name is"},
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{Row: 5, Col: 22, Name: "lname"}, // We're giving this field a name to replace its value at runtime
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{Row: 7, Col: 0, Content: "Press"},
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{Row: 7, Col: 6, Intense: true, Content: "enter"},
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{Row: 7, Col: 12, Content: "to enter your name again, or"},
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{Row: 7, Col: 41, Intense: true, Content: "PF3"},
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{Row: 7, Col: 45, Content: "to quit and disconnect."},
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{Row: 22, Col: 0, Content: "PF3 Exit"},
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}
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func main() {
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ln, err := net.Listen("tcp", ":3270")
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if err != nil {
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panic(err)
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}
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fmt.Println("LISTENING ON PORT 3270 FOR CONNECTIONS")
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fmt.Println("Press Ctrl-C to end server.")
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for {
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conn, err := ln.Accept()
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if err != nil {
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panic(err)
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}
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go handle(conn)
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}
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}
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// handle is the handler for individual user connections.
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func handle(conn net.Conn) {
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defer conn.Close()
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// Always begin new connection by negotiating the telnet options
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go3270.NegotiateTelnet(conn)
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// We will loop forever until the user quits with PF3
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var fieldValues map[string]string
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for {
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// Show the first screen, and wait to get a client response. Place
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// the cursor at the beginning of the first input field.
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// We're passing in the fieldValues map to carry values over from
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// the previous submission. We could pass nil, instead, if always want
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// the fields to start out blank.
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response, err := go3270.ShowScreen(screen1, fieldValues, 4, 20, conn)
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if err != nil {
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fmt.Println(err)
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return
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}
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// If the user pressed PF3, exit
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if response.AID == go3270.AIDPF3 {
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break
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}
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// If anything OTHER than "Enter", restart the loop
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if response.AID != go3270.AIDEnter {
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continue
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}
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// User must have pressed "Enter", so let's display the second screen,
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// echoing their responses back to them.
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fieldValues = response.Values
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response, err = go3270.ShowScreen(screen2, fieldValues, 0, 0, conn)
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if err != nil {
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fmt.Println(err)
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return
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}
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// If the user pressed PF3, exit
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if response.AID == go3270.AIDPF3 {
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break
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}
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// If they pressed anything else, just let the loop continue...
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continue
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}
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fmt.Println("Connection closed")
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}
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