小程序生成二维码

1.小程序调用生成二维码成功的时候，返回的是一个二维码图片的二进制文件流。
2.前端接受到图片的二进制的资源，拼接成

'data:' . $mime . ';base64,'base64_encode($wx_result)，

直接返回前端接收，前端再cavase绘图。

如果需要浏览器可以直接查看返回的二进制流，拼接成

<image src="'data:' . $mime . ';base64,'base64_encode($wx_result)" >,直接浏览器可以查看。

代码如下：

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/*     * 生成活动分享页二维码*/    public function buildImgIndex()    {        try{            $unionid = post('unionid');            $fileName = $unionid.'.png';            $fileData = WidRead($fileName);            if($fileData){                echo $this->img_uri($fileData);exit;            }else{                $TokenData = getAccessToken();                if($TokenData['code'] == 200){                    $accessToken = $TokenData['data']['access_token'];                }else{                    echo jsonOut(returnArr(410,'','error'));exit;                }                $page = "pages/activityflower/activityflower";                $scene = "unionid=".$unionid;      $path = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=".$accessToken;                $parameter = array(                    "access_token" => $accessToken,                    'scene' => $scene,  //绑定该用户的unionid                    'page' => $page,                    'auto_color'=>false,                    'width'=>430                );                $parameter = json_encode($parameter);                $curl = new CurlCurl();                $curl->setHeader('content-type','application/json; charset=utf-8');                $curl->setOpt(CURLOPT_SSL_VERIFYPEER,false);                $curl->setOpt(CURLOPT_SSL_VERIFYHOST,false);                $curl->post($path,$parameter);                if($curl->error){                    $error_message = $curl->error_message;                    $error_code = $curl->error_code;                    $response = $curl->response_headers;                    $param['response'] = $response;                    $param['code'] = $error_code;                    $param['msg'] = $error_message;                    $param['contents'] = "coin connect  error";                    $curl->close();                    echo jsonOut(returnArr(400,'',''));                }else{                    $data = $curl->response;  //返回图片文件流                    $curl->close();                }                $dataJson = json_decode($data);//如果成功返回文件流 json_decode为null,其他就自带微信的错误返回                if($dataJson == null){                    WidWrite($fileName,$data);                    echo $this->img_uri($data);exit;                }else{                    echo jsonOut(returnArr(400,'',''));exit;                }            }        }catch(Exception $e){            $res = array("code" => $e->getCode(), 'msg' => $e->getMessage());            echo jsonOut(returnArr(400, $res, 'error'));exit;        }    }        /*     * 二进制转图片image/png     * */    public function img_uri($contents, $mime ="image/png")    {        $base64   = base64_encode($contents);        return ('data:' . $mime . ';base64,' . $base64);    }