XineramaQueryScreens only returns a PXineramaScreenInfo

[KenJean]

Just ran into this on a two-monitor set-up.

When invoking XineramaQueryScreens (in xinerama.nim,) the function merely returns a PXineramaScreenInfo - i.e. a pointer to a XineramaScreenInfo object.

The original C Xlib XineramaQueryScreens function returns a pointer to a pointer of PXineramaScreenInfo objects. (i.e. a pointer to an array of XineramaScreenInfo objects.) As it is now in Nim I can only access the first XineramaScreenInfo object, not the second.

I'm sure there is a way to force cast this PXineramaScreenInfo into an array of PXineramaScreenInfos. I'm not so up to speed with Nim yet, but I guess I can figure it out.

In any case, I thought I'd report this little quirk.

⇒ KJ

[KenJean]

Figured out a way around the problem:

let pDisplay = XOpenDisplay(nil)
var numberOfMonitors: cint
let screenInfo = XineramaQueryScreens(pDisplay, numberOfMonitors.addr())
let arrayPointer = cast[ptr UncheckedArray[XineramaScreenInfo]](screenInfo)

Now arrayPointer can be used to access the metrics of each monitor, e.g.:

arrayPointer[0].width = width of the first monitor
arrayPointer[1].width = width of the second monitor

... just leaving a trail here in case someone does a web search on this.

⇒ KJ