extract png from Qt exes (or any other one)

qtpngextract.lua

local pnghead = "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a\x00\x00\x00\x0d\x49\x48\x44\x52\x00"
local pngend = "\x49\x45\x4e\x44\xae\x42\x60\x82"


local file = io.open("exe.exe", "rb")
local filedata = file:read("*all")

file:close()


local searchpos1 = 1
local searchpos2 = 1

local count = 1
while true do

	searchpos1 = string.find(filedata, pnghead, searchpos2)
	if not searchpos1 then break end
	searchpos2 = string.find(filedata, pngend, searchpos1)
	local fHandle = io.open(tostring(count) .. ".png", "wb")
	fHandle:write(filedata:sub(searchpos1,searchpos2 + #pngend))
	assert(searchpos2, "no end")
	count = count + 1
end