cv2.imread阻塞了流量

Question

我试图使用cv2.imread()读取图像，但流程只是阻止那里，永远不会返回，试图读取已存在的文件，但同样的问题，我不知道是什么原因是

@app.route('/api/upload', methods=['GET', 'POST'])
def upload_file():
    print('request method is {}'.format(request.method))
    if request.method == 'POST':
        # check if the post request has the file part
        if 'file' not in request.files:
            print('file not in request.files')
            return redirect(request.url)
        file = request.files['file']
        if file.filename == '':
            print('filename is {}'.format(file.filename))
            return redirect(request.url)
        print(file and allowed_file(file.filename))
        if file and allowed_file(file.filename):
            print('receiving ... ', file.filename)
            filename = secure_filename(file.filename)
            ts = int(time.time())
            file_name = file_name_template.format(ts, filename)
            print(file_name)
            filePath = os.path.join(app.root_path, app.config['UPLOAD_FOLDER'], file_name)

            file.save(filePath)
            print('reading image')
            cv2.imread(filePath)
            return 'done' #never executed

注意：这是在WAMP server + WSGI上运行的烧瓶应用程序

Answer 1

我相信已经在另一个posting回答了这个问题。另见http://blog.rtwilson.com/how-to-fix-flask-wsgi-webapp-hanging-when-importing-a-module-such-as-numpy-or-matplotlib/。

基本上，它没有使用主解释器来运行cv2.imread，它在子解释器中运行不正常。