使用GOTK3和librsvg在Go中如何加载内联SVG

You can load inlined SVG with gdk.PixbufNewFromDataOnly through passing your svg string as slice of bytes to it then getting pixbuf from it and putting it to gtk.ImageNewFromPixbuf to get *gtk.Image to use it in your window.
And here is one of correct implementation of your mentioned ImageNewFromSvg function:

func ImageNewFromSvg(svg string) (*gtk.Image, error){
  pixbuff, err := gdk.PixbufNewFromDataOnly([]byte(svg))
  if err !=  nil {
    return nil, err
  }
  
  img, err := gtk.ImageNewFromPixbuf(pixbuff)
  
  if err !=  nil {
    return nil, err
  }
  
  return img, nil
}

实际GTK程序中的用法示例:

package main

import (
    "log"

    "github.com/gotk3/gotk3/gtk"
    "github.com/gotk3/gotk3/gdk"
)

func main() {
    gtk.Init(nil)

    win, err := gtk.WindowNew(gtk.WINDOW_TOPLEVEL)
    if err != nil {
        log.Fatal("Unable to create window:", err)
    }
    win.SetTitle("Svg Example")
    win.Connect("destroy", func() {
        gtk.MainQuit()
    })


    color := "#FF0000"
    svgdata := "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n" +
               "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n" +
               "<svg version=\"1.1\" id=\"Layer_1\" xmlns=\"http://www.w3.org/2000/svg\" xmlns:xlink=\"http://www.w3.org/1999/xlink\" x=\"0px\" y=\"0px\" width=\"32px\" height=\"32px\" viewBox=\"0 0 32 32\" enable-background=\"new 0 0 32 32\" xml:space=\"preserve\">\n" +
               "    <rect fill=\"" + color + "\" width=\"32\" height=\"32\"/>\n" +
               "</svg>"

    svgImage, err  := ImageNewFromSvg(svgdata)
    
    if err != nil {
        log.Fatal(err)
    }
    
    win.Add(svgImage)
    win.ShowAll()


    gtk.Main()
}  

func ImageNewFromSvg(svg string) (*gtk.Image, error){
  pixbuff, err := gdk.PixbufNewFromDataOnly([]byte(svg))
  if err !=  nil {
    return nil, err
  }
  
  img, err := gtk.ImageNewFromPixbuf(pixbuff)
  
  if err !=  nil {
    return nil, err
  }
  
  return img, nil
}

And output: