Change default font roFontRegistry in Roku

I have created a page with roImageCanvas ,and i am trying to change its default font with another one.bellow is my code but this won't work.Please help me to resolve this error.thanks in advance.

 canvas = CreateObject("roImageCanvas")    
 port = CreateObject("roMessagePort")
 canvas.SetMessagePort(port)
 items = []

FontInterface=CreateObject("roFontRegistry") 'create global font access
Fontinterface.Register("pkg:/source/Univers.ttf")
Font=FontInterface.GetFont("Univers",36,false,false)
FontSmall=FontInterface.GetFont("Univers",15,false,false)


items.Push({
Text: "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s"
TextAttrs:{ font: Font, color: "#a0a0a0"}
TargetRect: {x: 200, y: 75, w: 300, h: 500}
})

items.Push({
Text: "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s"
TextAttrs:{ font: FontSmall, color: "#a0a0a0"}
TargetRect: {x: 600, y: 75, w: 300, h: 500}
})

canvas.SetLayer(0, { Color: "#00ff00", CompositionMode: "Source" })
canvas.SetLayer(1, items)
canvas.Show()

回答1:

Use

Font=FontInterface.Get("Univers",36,false,false)
FontSmall=FontInterface.Get("Univers",15,false,false)

Insted of

Font=FontInterface.GetFont("Univers",36,false,false)
FontSmall=FontInterface.GetFont("Univers",15,false,false)

回答2:

First, for the roImageCanvas, you should be using roFontRegistry.Get() instead of roFontRegistry.GetFont(). GetFont() is for use with the roScreen.

Second, are you sure the font family is actually "Univers"? After you've registered the font, you can call roFontRegistry.GetFamilies() to get a list of the registered font family names.