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 \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"
)
{
$base
64
= base
64
_encode($contents);
return (
'data:'
. $mime .
';base64,'
. $base
64
);
}
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