var img: ptr cchar= nil #
var w, h: cuint = 0     #DECLARED AS VAR

var file = open("test.png")
var data = readAll(file).string
lodepngDecode32(img, w, h, data[0].addr, data.len.csize)

#Error: type mismatch: got (ptr cchar, cuint, cuint, ptr char, csize) but expected one of:
#img.lodepng_decode32(image: var ptr cchar, width: var cuint, height: var cuint, file: var ptr char, insize: csize)