Golang : Simple image viewer with Go-GTK

This is a really simple command line image viewer program written in Golang. Instead of viewing images with Photoshop or web browser, I need this cross-platform command line image viewer to view the images generated by my image processor program.

To get it running.

First, install the gtk library.

Windows :

Download at http://www.gtk.org/download/windows.php

Linux: (you can use higher version instead of 2.0)

apt-get install libgtk2.0-dev libglib2.0-dev libgtksourceview2.0-dev

or

yum install libgtk2.0-dev libglib2.0-dev libgtksourceview2.0-dev

MacOSX:

Get the latest Homebrew

ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

then

brew install gtk

Next :

go get github.com/mattn/go-gtk/gdkpixbuf

go get github.com/mattn/go-gtk/glib

go get github.com/mattn/go-gtk/gtk

Once the gtk library is installed. Build this code below and execute ./imageviewer <your image file> - such as ./imageviewer helloworld.png

Here you go!

imageviewer.go

---

 package main

 import (
 "fmt"
 "github.com/mattn/go-gtk/glib"
 "github.com/mattn/go-gtk/gtk"
 "os"
 )

 func ErrorCheck(err error) {

 if err != nil {
 panic(err)
 }
 }

 func main() {
 if len(os.Args) != 2 {
 fmt.Printf("Usage : %s <image file>\n", os.Args[0])
 os.Exit(0)
 }

 imageFile := os.Args[1]

 gtk.Init(nil)
 window := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
 window.SetPosition(gtk.WIN_POS_CENTER)
 window.SetTitle("Golang GTK Really Primitive Image Viewer")
 window.SetIconName("gtk-dialog-info")
 window.Connect("destroy", func(ctx *glib.CallbackContext) {
 gtk.MainQuit()
 }, "Happy coding!")

 hbox := gtk.NewHBox(false, 1)

 hpaned := gtk.NewHPaned()
 hbox.Add(hpaned)

 frame1 := gtk.NewFrame(imageFile)
 framebox1 := gtk.NewHBox(false, 1)
 frame1.Add(framebox1)

 hpaned.Pack1(frame1, false, false)

 image := gtk.NewImageFromFile(imageFile)
 framebox1.Add(image)

 window.Add(hbox)
 imagePixBuffer := image.GetPixbuf()
 horizontalSize := imagePixBuffer.GetWidth()
 verticalSize := imagePixBuffer.GetHeight()
 window.SetSizeRequest(horizontalSize, verticalSize)
 window.ShowAll()
 gtk.Main()

 }

---

Sample output:

Reference:

https://github.com/mattn/go-gtk