Initial release

.gitignore

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+dist
+rsrc.syso

main.go

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+package main
+
+import (
+	"net"
+	"net/http"
+	"os"
+	"path/filepath"
+
+	"github.com/lxn/walk"
+	. "github.com/lxn/walk/declarative"
+	"github.com/skip2/go-qrcode"
+)
+
+const size = 300
+
+func getIP() string {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		os.Stderr.WriteString("Oops: " + err.Error() + "\n")
+		os.Exit(1)
+	}
+
+	for _, a := range addrs {
+		if ipnet, ok := a.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {
+			if ipnet.IP.To4() != nil && ipnet.IP.To4()[0] == 192 {
+				return ipnet.IP.String()
+			}
+		}
+	}
+
+	return ""
+}
+
+func showError(text string) {
+	MainWindow{
+		Title:  "QR Serve",
+		Size:   Size{size + 100, 200},
+		Layout: VBox{},
+		Children: []Widget{
+			TextLabel{
+				Text:          text,
+				TextAlignment: AlignHCenterVCenter,
+			},
+		},
+	}.Run()
+}
+
+func main() {
+	if len(os.Args) < 2 {
+		showError("File not specified. Please open your file with QR Serve.")
+		return
+	}
+
+	filePath := os.Args[1]
+	fileName := filepath.Base(filePath)
+	ip := getIP()
+
+	ln, err := net.Listen("tcp", ip+":0")
+	if err != nil {
+		showError(err.Error())
+		return
+	}
+
+	defer ln.Close()
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		http.ServeFile(w, r, filePath)
+	})
+
+	go http.Serve(ln, nil)
+
+	q, _ := qrcode.New("http://"+ln.Addr().String()+"/"+fileName, qrcode.Medium)
+	bm, _ := walk.NewBitmapFromImage(q.Image(size))
+
+	MainWindow{
+		Title:  fileName,
+		Size:   Size{size + 100, size + 100},
+		Layout: VBox{},
+		Children: []Widget{
+			ImageView{
+				MinSize: Size{size, size},
+				MaxSize: Size{size, size},
+				Image:   bm,
+			},
+			TextLabel{
+				Text:          "Close this window when you're done downloading the file",
+				TextAlignment: AlignHCenterVCenter,
+			},
+		},
+	}.Run()
+}

qr-serve.manifest

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+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
+    <assemblyIdentity version="1.0.0.0" processorArchitecture="*" name="qrserve" type="win32"/>
+    <dependency>
+        <dependentAssembly>
+            <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
+        </dependentAssembly>
+    </dependency>
+    <application xmlns="urn:schemas-microsoft-com:asm.v3">
+        <windowsSettings>
+            <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitorV2, PerMonitor</dpiAwareness>
+            <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">True</dpiAware>
+        </windowsSettings>
+    </application>
+</assembly>

release.sh

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+rsrc -manifest ./qr-serve.manifest
+go build -ldflags="-H windowsgui"
+mkdir -p dist
+mv qr-serve.exe dist/