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Download image over https using python
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# using socket | |
import socket | |
import time | |
HOST = 'data.pr4e.org' | |
PORT = 80 | |
mysock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) | |
mysock.connect((HOST, PORT)) | |
mysock.sendall(b'GET http://data.pr4e.org/cover3.jpg HTTP/1.0\r\n\r\n') | |
count = 0 | |
picture = b'' | |
while True: | |
data = mysock.recv(5120) # receive data in groups of 5120 characters | |
if len(data) < 1: break | |
time.sleep(0.25) # allows server to be "ahead" of us by 0.25s | |
count += len(data) | |
print(len(data), count) | |
# if we uncomment time.sleep(0.25), we are more likely to get < 5210 bytes sometimes | |
picture = picture + data | |
mysock.close() # close socket | |
# Look for the end of the header file | |
pos = picture.find(b'\r\n\r\n') # end indicated by 2 * (endline + newline) | |
print('Header length ', pos) | |
print(picture[:pos].decode()) # pos marks the end | |
# Skip past the header and save the picture data | |
picture = picture[pos + 4:] | |
fhand = open('stuff.jpg', 'wb') | |
fhand.write(picture) | |
fhand.close() # must ensure that file is permanently saved |
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# using urllib, which simplifies the code | |
import urllib.request, urllib.parse, urllib.error | |
img = urllib.request.urlopen('http://data.pr4e.org/cover3.jpg') # img is a string variable | |
fhand = open('cover3.jpg', 'wb') | |
size = 0 | |
while True: | |
info = img.read(100000) # reads 100,000 characters at a time, prevents crash | |
if len(info) < 1: break | |
size += len(info) | |
fhand.write(info) # for small files, we can simply go with fhand.write(img) | |
print(size, ' characters copied') # 230210 characters copied | |
fhand.close() |
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