python开发_imghdr_图像格式支持

1 imghdr.what(filename, h=None) 
2        Tests the image data contained in the file named by filename, and returns a string describing the image type. If optional h is provided, t         he filename is ignored and h is assumed to contain the byte stream to test.

1 imghdr.tests 
2       A list of functions performing the individual tests. Each function takes two arguments: the byte-stream and an open file-like object. When         what() is called with a byte-stream, the file-like object will be None.
3 
4       The test function should return a string describing the image type if the test succeeded, or None if it failed.

 1 #python imghdr
 2 
 3 #Author   :   Hongten
 4 #Mailto   :   hongtenzone@foxmail.com
 5 #Blog     :   http://www.cnblogs.com/hongten
 6 #QQ       :   648719819
 7 #Version  :   1.0
 8 #Create   :   2013-09-09
 9 
10 import os
11 import imghdr
12 
13 #global var
14 #image path
15 IMG_PATH = None
16 
17 __author__ = ['Hongten']
18 
19 def get_ext(path):
20     '''return a string describing the image type.'''
21     if os.path.exists(path):
22         return imghdr.what(path)
23     else:
24         print('the path [{}] dose not exit!'.format(path))
25 
26 def init():
27     global IMG_PATH
28     IMG_PATH = 'C:\\test\\hongten.jpg'
29 
30 def main():
31     init()
32     img_ext = get_ext(IMG_PATH)
33     print('the image : [{}],and the type is :[{}]'.format(IMG_PATH, img_ext))
34 
35 if __name__ == '__main__':
36     main()

the image : [C:\test\hongten.jpg],and the type is :[jpeg]