小程序生成二维码

时间：2020-12-30 11:04:26 收藏：0 阅读：0

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：

/*
    * 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 \Curl\Curl();
               $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);
   }