微信小程序中用Python生成二维码的两种方式

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微信小程序生成二维码：

所用语言python，有两种方式：

1： 后端传一段字符串给前端， 前端显示

2： 后端直接生成图片

1： 后端传一段字符串给前端， 前端显示

def get_wxCode(Request, UserInfo):
    try:
        scene = Request["scene"]
        access_token = get_wxCode_token()
        if not access_token:
            return False
        textmod = {"scene": scene, "page": "pages/index/main", "width": 430, "auto_color": True, "is_hyaline": False}
        textmod = json.dumps(textmod).encode(encoding='utf-8')
        header_dict = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko',
                       "Content-Type": "application/json"}
        url = 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' + access_token
        req = request.Request(url=url, data=textmod, headers=header_dict)
        res = request.urlopen(req)
        res = res.read()
        b64str = base64.b64encode(res)
        return b64str
    except Exception as e:
        print(e)
        return False

var getWXcode2 = function(hostname){  //获取管理端小程序码

    //动态获取域名，若为本地环境，则默认携带参数为wx-test
    //示例:londex.i-plc.cn
    var hostname1 =  window.location.host;
    hostname1 = hostname1.split('.')[0];
    if(hostname1 == '127' || hostname1 == 'localhost'){
        hostname1 = hostname;
    }
    if(window.localStorage.getItem('wxcode2')){
        $('#wxcodeImg2').attr('src','data:image/png;base64,'+ window.localStorage.getItem('wxcode2'));
        $('#wxCodeModal2').modal('show');
        return;
    }
    var params = {
        "scene":hostname1,
    };
    $.ajax({
        type:'post',
        url:'/request?rname=i_plc.Page.wechat_api.wechat.get_wxCode',
        data:params,
        success:function (res) {
            console.log(res)

            if(res === false){
                $.MessageBox.notify('warn', '获取失败，请稍后再试！');
            }else{
                console.log(res)
                $('#wxcodeImg2').attr('src','data:image/png;base64,'+res);
                $('#wxCodeModal2').modal('show');
                window.localStorage.setItem('wxcode2',res)
            }

        }
    });
};

2： 后端直接生成图片

def get_wxCode(Request, UserInfo):
    """
        生成小程序二维码
    :param Request:
    :param UserInfo:
    :return:
    """
    result = {"success": False}
    try:
        # scene = Request["scene"]
        access_token = get_wxCode_token()
        if not access_token:
            raise Exception("access_token")
        compid = Request["compid"]
        sql = "select compIndex from company where operationFlag=9 and compID=%s" % compid
        Result = SqlRun(sql)
        if Result["Data"] and Result["Data"][0] and Result["Data"][0][0]:
            scene = Result["Data"][0][0]

            textmod = {"scene": scene, "page": "pages/index/main", "width": 430, "auto_color": True, "is_hyaline": False}
            textmod = json.dumps(textmod).encode(encoding='utf-8')
            header_dict = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko',
                           "Content-Type": "application/json"}
            url = 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' + access_token
            req = request.Request(url=url, data=textmod, headers=header_dict)
            res = request.urlopen(req)
            res = res.read()
            b64str = base64.b64encode(res)
            imgdata=base64.b64decode(b64str)

            path = "static/tmpfiles/scan_%s.png" % file_name
            file = open(os.path.join(settings.BASE_DIR, path,), 'wb+')
            file.write(imgdata)
            file.close()

            result["code_url"] = path
            result["success"] = True
    except Exception as e:
        result["error_msg"] = str(e)
    return json.dumps(result)


def get_wxCode_token():
    try:
        textmod = {"grant_type": "client_credential",
            "appid": "wx44a452fb08b0a990",
            "secret": "9aedb0a274027bdd09612fbde3298129"
        }
        textmod = parse.urlencode(textmod)
        header_dict = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1; Trident/7.0; rv:11.0) like Gecko'}
        url = 'https://api.weixin.qq.com/cgi-bin/token'
        req = request.Request(url='%s%s%s' % (url, '?', textmod), headers=header_dict)
        res = request.urlopen(req)
        res = res.read().decode(encoding='utf-8')
        res = json.loads(res)
        access_token = res["access_token"]
        return access_token
    except Exception as e:
        print(e)
        return False

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