Looking at your data, the header is at offset 0x60, not 0x50. If I use infile.seek(0x60) it works fine.
Kent
Aaron Elbaz wrote:
Hi,
My question is sort of on the difficult side, but I promise I'm a newb ;) So maybe it isn't..
Frederick Lundh himself gave me this chunk of code..and I can't get it to work. I was hoping someone could spot the error.
The goal is to extract a png image file from a binary simcity 4 file. #import struct # #def pngcopy(infile, outfile): # # # copy header # header = infile.read(8) # if header != "\211PNG\r\n\032\n": # raise IOError("not a valid PNG file") # outfile.write(header) # # # copy chunks, until IEND # while 1: # chunk = infile.read(8) # size, cid = struct.unpack("!l4s", chunk) # outfile.write(chunk) # outfile.write(infile.read(size)) # outfile.write(infile.read(4)) # checksum # if cid == "IEND": # break # #infile = open("/home/flamesrock/Desktop/peachville.sc4", "rb") #infile.seek(0x50) #outfile = open("myimage.png", "wb") #pngcopy(infile, outfile) #outfile.close() #infile.close()
It returns the IO error when I try it on this and other files: http://simcitysphere.com/peachville.sc4
I've confirmed the position using a hex editor (its the first 'P' or 0x50 in the file) http://simcitysphere.com/peachville.png
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