First working version.

.gitignore

@@ -0,0 +1,2 @@
+config.json
+screenshot.png

go.mod

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+module goscreenshot
+
+go 1.21.10
+
+require (
+	github.com/bwmarrin/discordgo v0.28.1
+	github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237
+)
+
+require (
+	github.com/gen2brain/shm v0.0.0-20230802011745-f2460f5984f7 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/jezek/xgb v1.1.0 // indirect
+	github.com/lxn/win v0.0.0-20210218163916-a377121e959e // indirect
+	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b // indirect
+	golang.org/x/sys v0.11.0 // indirect
+)

go.sum

@@ -0,0 +1,22 @@
+github.com/bwmarrin/discordgo v0.28.1 h1:gXsuo2GBO7NbR6uqmrrBDplPUx2T3nzu775q/Rd1aG4=
+github.com/bwmarrin/discordgo v0.28.1/go.mod h1:NJZpH+1AfhIcyQsPeuBKsUtYrRnjkyu0kIVMCHkZtRY=
+github.com/gen2brain/shm v0.0.0-20230802011745-f2460f5984f7 h1:VLEKvjGJYAMCXw0/32r9io61tEXnMWDRxMk+peyRVFc=
+github.com/gen2brain/shm v0.0.0-20230802011745-f2460f5984f7/go.mod h1:uF6rMu/1nvu+5DpiRLwusA6xB8zlkNoGzKn8lmYONUo=
+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
+github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/jezek/xgb v1.1.0 h1:wnpxJzP1+rkbGclEkmwpVFQWpuE2PUGNUzP8SbfFobk=
+github.com/jezek/xgb v1.1.0/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
+github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237 h1:YOp8St+CM/AQ9Vp4XYm4272E77MptJDHkwypQHIRl9Q=
+github.com/kbinani/screenshot v0.0.0-20230812210009-b87d31814237/go.mod h1:e7qQlOY68wOz4b82D7n+DdaptZAi+SHW0+yKiWZzEYE=
+github.com/lxn/win v0.0.0-20210218163916-a377121e959e h1:H+t6A/QJMbhCSEH5rAuRxh+CtW96g0Or0Fxa9IKr4uc=
+github.com/lxn/win v0.0.0-20210218163916-a377121e959e/go.mod h1:KxxjdtRkfNoYDCUP5ryK7XJJNTnpC8atvtmTheChOtk=
+golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b h1:7mWr3k41Qtv8XlltBkDkl8LoP3mpSgBW8BUoxtEdbXg=
+golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sys v0.0.0-20201018230417-eeed37f84f13/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.11.0 h1:eG7RXZHdqOJ1i+0lgLgCpSXAp6M3LYlAo6osgSi0xOM=
+golang.org/x/sys v0.11.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

main.go

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+package main
+
+import (
+	"encoding/json"
+	"image/png"
+	"os"
+	"time"
+
+	"github.com/bwmarrin/discordgo"
+	"github.com/kbinani/screenshot"
+)
+
+const screenshot_path = "screenshot.png"
+const config_path = "config.json"
+
+func GetConfig() (string, string, error) {
+	configFile, err := os.ReadFile(config_path)
+
+	if err != nil {
+		panic(err)
+	}
+
+	isValid := json.Valid(configFile)
+
+	if !isValid {
+		println("Configuration in config.json is not valid JSON.")
+		panic(isValid)
+	}
+
+	var config map[string]interface{}
+
+	json.Unmarshal(configFile, &config)
+
+	token := config["token"].(string)
+	channelId := config["channelId"].(string)
+
+	return token, channelId, nil
+}
+
+func SendScreenshots(discord *discordgo.Session, channelId string, sleepDuration time.Duration) {
+	for {
+		new_image, err := screenshot.CaptureDisplay(0)
+
+		if err != nil {
+			panic(err)
+		}
+
+		file, err := os.Create(screenshot_path)
+
+		if err != nil {
+			panic(err)
+		}
+
+		err = png.Encode(file, new_image)
+
+		if err != nil {
+			panic(err)
+		}
+
+		err = file.Close()
+
+		if err != nil {
+			panic(err)
+		}
+
+		file, err = os.Open(screenshot_path)
+
+		if err != nil {
+			panic(err)
+		}
+
+		_, err = discord.ChannelFileSend(channelId, screenshot_path, file)
+
+		if err != nil {
+			panic(err)
+		}
+
+		err = file.Close()
+
+		if err != nil {
+			panic(err)
+		}
+
+		time.Sleep(sleepDuration)
+	}
+}
+
+func main() {
+	token, channelId, err := GetConfig()
+
+	if err != nil {
+		panic(err)
+	}
+
+	discord, err := discordgo.New("Bot " + token)
+
+	if err != nil {
+		panic(err)
+	}
+
+	sleepDuration, err := time.ParseDuration("3s")
+
+	if err != nil {
+		panic(err)
+	}
+
+	SendScreenshots(discord, channelId, sleepDuration)
+}