Windows 下 web.py上传图片乱码的解决办法

今天在Windows平台下用web.py搭了个服务器，接收上传的图片并存储，参考的是官方cookbook里的示例代码：

def POST(self):
        x = web.input(myfile={})
        filedir = '/path/where/you/want/to/save' # change this to the directory you want to store the file in.
        if 'myfile' in x: # to check if the file-object is created
            filepath=x.myfile.filename.replace('\\','/') # replaces the windows-style slashes with linux ones.
            filename=filepath.split('/')[-1] # splits the and chooses the last part (the filename with extension)
            fout = open(filedir +'/'+ filename,'w') # creates the file where the uploaded file should be stored
            fout.write(x.myfile.file.read()) # writes the uploaded file to the newly created file.
            fout.close() # closes the file, upload complete.
        raise web.seeother('/upload')

然后在服务器端打开存储的图片，是大片大片的色块，完全不能用，一定是编码出问题了，网上搜了一下，参考豆瓣里这个 帖子，把

fout = open(filedir +'/'+ filename,'w')

替换成

fout = open(filedir +'/'+ filename,'wb')

问题就解决了。

原来，Windows下默认的写入是按照字符来写入的，而我们的图片是2进制的，所以在文件的打开方式参数里用‘b’来说明按照2进制来写入，问题就解决了。