我正在使用烧瓶进行python项目,我使用google map api在项目中显示地图.我实现了html2canvas脚本来成功捕获地图.但我在地图中也有标记,它没有捕获.所以我尝试使用html2canvasPythonProxy
这是我的模板gpsDataMap的javascript文件片段：

$(window).load(function(){
      $('#saveMap').click(function(){
          html2canvas(document.getElementById('map'), {
             "logging": true, //Enable log (use Web Console for get Errors and Warnings)
             "proxy":"/surveyApp/gpsDataMap/html2canvas-proxy",
             useCORS:true,
             "onrendered": function(canvas) {
              var img = new Image();
             img.onload = function() {
             img.onload = null;
             document.body.appendChild(img);
           };
            img.onerror = function() {
            img.onerror = null;
            if(window.console.log) {
               window.console.log("Not loaded image from canvas.toDataURL");
                  } else {
            alert("Not loaded image from canvas.toDataURL");
               }
              };
                img.src = canvas.toDataURL("image/png");
               }
            });

        });
    });

和我的python代码片段：

import os
import datetime

from flask import Flask, request, render_template, redirect, url_for, flash, Response
from flask.json import dumps
from flask import json
from flask import g, Blueprint, session, abort
from flask_principal import Identity, identity_changed, identity_loaded, RoleNeed, AnonymousIdentity
from flask_login import LoginManager, login_user, login_required, logout_user
from app import app
from model.user_info import SurveyForms

from flask.ext.pymongo import PyMongo

from inspect import getmembers, isfunction
import formConfig
import formTree
import fieldChoices
from dashboard import dashboardData
from collections import namedtuple
from pymongo import MongoClient
from flask import request


from html2canvasproxy import * #include html2canvasproxy in your application
import urlparse
import re




surveyApp_module = Blueprint('surveyApp_module', __name__)


app.config['MONGO_HOST'] = 'localhost'
app.config['MONGO_PORT'] = 27017
app.config['MONGO_DBNAME'] = 'survey'
mongo = PyMongo(app)

h2c = None
real_path = os.getcwd() + '/static/images'
virtual_path = '/gpsDataMap/images/'

@surveyApp_module.route('/')
@login_required
def show_formList():
    forms = []
    forms = [form.form_name for form in SurveyForms.select().where(SurveyForms.organization_name==session['organization_id'])]
    # strip .xml from string to compare with returnData
    forms =  [form.replace('.xml','') for form in forms]
    returnData = mongo.db.collection_names()
    returnData.pop(returnData.index('system.indexes'))
    intersected_forms = list(set(forms).intersection(returnData))
    if len(intersected_forms):
        return render_template('index_pjj.html', surveyEntries=intersected_forms)
    return render_template('index_pjj.html', surveyEntries=['No Survey'])

@surveyApp_module.route('/dashboard', methods=['POST'])
def dashboard():
    formName = request.form['whichSurvey']
    session['formName'] = formName
    formtree = formTree.formParseDict(formName)
    returnData = dashboardData(formName, mongo.db)
    summaryData = totalSummary(formName, mongo.db)
    jsonData = json.dumps(returnData)
    return render_template('dashboard.html', formName=formName, formTree=formtree, returnData=returnData, summaryData=summaryData, jsonData=jsonData)


@surveyApp_module.route('/gpsDataView', methods=['POST'])
def gpsDataView():
    formName = request.form['whichSurvey']
    gpsFields = formConfig.survey[formName]['gpsField']
    (location, fieldName, fieldSelection, fieldChoicesList) = "", "", "", []
    location = request.form['location']
    fieldName = request.form['fieldName']
    try:
        fieldSelection = request.form['fieldChoices']
    except KeyError:
        pass
    fieldChoicesList = request.form.getlist('fieldChoicesList')
    fieldData = commonFunctions.vizFieldList(formName)
    totalFieldData = commonFunctions.vizFieldListFull(formName)
    locationIdentifiers = fieldChoices.locationFieldChoices(formName, mongo.db)
    returnData = gpsVariate.getDataforGPSMap(formName, mongo.db, gpsFields, location, fieldName, fieldSelection, fieldChoicesList)
    return render_template('gpsDataMap.html', returnData=returnData, formName=formName, fieldData=fieldData, totalFieldData=totalFieldData, locationIdentifiers=locationIdentifiers)



    #Copy html2canvas.js to static folder (If not use cdns)
@surveyApp_module.route('/gpsDataMap/html2canvas.js')
def html2canvas_js():
    return app.send_static_file('html2canvas.js')



@surveyApp_module.route('/gpsDataMap/html2canvas-proxy')
def html2canvas_proxy():
    print ("is this proxy really calling ");
    h2c = html2canvasproxy(request.args.get('callback'), request.args.get('url'))
    h2c.userAgent(request.headers['user_agent'])
    # import pdb;pdb.set_trace()


    if request.referrer is not None:
        h2c.referer(request.referrer)

    h2c.route(real_path, virtual_path)

    r = h2c.result()
    # print r['mime']
    # print r['data']

    return Response(r['data'], mimetype=r['mime'])




 # Get images saved by html2canvasproxy
@surveyApp_module.route('/gpsDataMap/html2canvas/images/<image>')
def images(image):
    res = html2canvasproxy.resource(real_path, image)

    if res is None:
        return '', 404

    else:
        return res['data']

这是我的main.py脚本：

from app import app, db


from auth import *
from admin import admin
from model import *
from view import *
from filters.user_privilege import check_privilege
from filters.form_filter import filter_type

# custom filters
app.jinja_env.filters['check_privilege'] = check_privilege
app.jinja_env.filters['filter_type'] = filter_type


from surveyApp import surveyApp_module
app.register_blueprint(surveyApp_module, url_prefix='/surveyApp')

from view.accounts.login import login_module
app.register_blueprint(login_module)


if __name__ == '__main__':
    app.run(port=5555)

在这样做的同时,我在控制台中获得了以下内容：

html2canvas: Preload starts: finding background-images html2canvas.js:21
html2canvas: Preload: Finding images html2canvas.js:21
html2canvas: Preload: Done. html2canvas.js:21
html2canvas: start: images: 1 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 2 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 3 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 4 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 5 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 6 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 7 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 8 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 9 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 10 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 11 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 12 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 13 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 14 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 15 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 16 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 17 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 18 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 19 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 20 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 21 / 23 (failed: 0) html2canvas.js:21
html2canvas: start: images: 22 / 23 (failed: 0) html2canvas.js:21
GET http://127.0.0.1:5555/home/bhim/app/surveyApp_bhim/images/a0af53c02bd2f2aed37f1d895edcf3485117c512.png 404 (NOT FOUND) html2canvas.js:2249
html2canvas: start: images: 23 / 23 (failed: 1) html2canvas.js:21
Finished loading images: # 23 (failed: 1) html2canvas.js:21
html2canvas: Error loading background: html2canvas.js:21
html2canvas: Renderer: Canvas renderer done - returning canvas obj 

更新：
调试器结果：

folder => images,
timeout => 30,
mimetype => application/javascript,
ua => Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:29.0) Gecko/20100101 Firefox/29.0,
host => 127.0.0.1:5555,
scheme => http,
ref => ,
url => http://www.google.com,
callback => console.log,
default_callback => console.log,
status => 0,
routePath => /static/images/,
savePath => /home/bhim/app/surveyApp_bhim/static/images/,
prefix => htc_,
real_extension => ,
mimes => ['image/bmp', 'image/windows-bmp', 'image/ms-bmp', 'image/jpeg', 'image/jpg', 'image/png', 'image/gif', 'text/html', 'application/xhtml', 'application/xhtml+xml']

更新谷歌地图图像的屏幕截图

标记未被捕获.

解决方法:

1)使用useCORS：true或使用代理,不要同时使用两者.

2)您的路线不同,请参阅：

> virtual_path =’/ gpsDataMap / images /’
> @ surveyApp_module.route(‘/ gpsDataMap / html2canvas / images /< image>‘)

3)您的代理路由,似乎是错误的(在您的Javascript中)：

>“proxy”：“/ surveyApp / gpsDataMap / html2canvas-proxy”,
> @ surveyApp_module.route(‘/ gpsDataMap / html2canvas-proxy’)

你没有意识到所有错误,为什么带有“PROXY”的userCORS会感到困惑.

修复所有路由(路由是它们的虚拟路径)并修复你的javascript(不要使用userCORS :),请参阅：

$(window).load(function(){
    $('#saveMap').click(function(){
        html2canvas(document.getElementById('map'), {
                "logging": true, //Enable log (use Web Console for get Errors and Warnings)
                //useCORS:true, "COMMENTED", remove useCORS
                "proxy": YOUR_FIXED_ROUTE,
                "onrendered": function(canvas) {
                    var img = new Image();
                    img.onload = function() {
                        img.onload = null;
                        document.body.appendChild(img);
                    };

                    img.onerror = function() {
                        img.onerror = null;
                        if(window.console.log) {
                            window.console.log("Not loaded image from canvas.toDataURL");
                        } else {
                            alert("Not loaded image from canvas.toDataURL");
                        }
                    };
                    img.src = canvas.toDataURL("image/png");
                }
        });
    });
});

看,这是与“路线”混合的绝对路径：

获取http://127.0.0.1:5555/home/bhim/app/surveyApp_bhim/images/a0af53c02bd2f2aed37f1d895edcf3485117c512.png 404(未找到)html2canvas.js：2249

任何原因的代理响应路径都是错误的,请使用：

1)编辑你的代码,如下所示：

@surveyApp_module.route('/gpsDataMap/html2canvas-proxy')
def html2canvas_proxy():
    print ("is this proxy really calling ");
    h2c = html2canvasproxy(request.args.get('callback'), request.args.get('url'))
    h2c.userAgent(request.headers['user_agent'])

    if request.referrer is not None:
        h2c.referer(request.referrer)

    if request.args.get('debug_vars'): #Added
        return Response((',\n'.join(h2c.debug_vars())), mimetype='text/plain') #Added

    h2c.route(real_path, virtual_path)

    r = h2c.result()
    return Response(r['data'], mimetype=r['mime'])

2)在浏览器中运行：

http://127.0.0.1:5000/gpsDataMap/html2canvas-proxy?callback=console.log\u0026amp;url=http://www.google.com\u0026amp;debug_vars=1

3)获得结果并在你的任务中发布.