畢竟要透過Qt來使用JavaScript,不是這麼多範例可以參考,所以後來就改變策略-------
在html上寫JS然後透過QWebView+QUrl來呼叫網頁達成目的!
需要知道的
1.JavaScript如何轉址
2.JavaScript的FB login SDK流程如何
3.如何取得response與accessToken(最重要!App通行證)
//
第一個網址:
我們需要自動轉址到Facebook Login畫面
第二個網址:
Login成功以後,需要轉址到第二個網址(如果都轉址到第一個網址,會造成無窮迴圈)
取得accessToken
第三個網址:
為了讓Qt取得accessToken我們必須要在網址上面動手腳,
也就是帶accessToken在網址上,因此第二網址再轉址到第三網址
以上為說明
-----------------------------------------------------------------------------------------------------------------------
1.test1.html
<!DOCTYPE html>
<html>
<head>
<title>Facebook Login</title>
<meta charset="UTF-8">
</head>
<body>
<p>測試文字</p>
<script>
var url2 = 'https://www.facebook.com/dialog/oauth?client_id=你的App ID&scope=email,user_birthday&redirect_uri=第二網址';
setTimeout("location.href=url2",1);//轉址目的地,自動轉址秒數
console.log('test2');
</script>
<div id="status">
</div>
</body>
</html>
2.test2.html
<!DOCTYPE html>
<html>
<head>
<title>Facebook Login JavaScript Example</title>
<meta charset="UTF-8">
</head>
<body>
<p>123</p>
<script>
<!--開頭initial-->
var url;
window.fbAsyncInit = function() {
// init the FB JS SDK
FB.init({
appId : '你的ID',
cookie : true, // enable cookies to allow the server to access
// the session
xfbml : true, // parse social plugins on this page
version : 'v2.2' // use version 2.2
});
FB.login(function(response) {
console.log('in FB.login');
if (response.authResponse) {
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Good to see you, ' + response.name + '.');
});
} else {
console.log('User cancelled login or did not fully authorize.');
}
});
// This is called with the results from from FB.getLoginStatus().
function statusChangeCallback(response) {
console.log('in function: statusChangeCallback');
console.log(response);
// The response object is returned with a status field that lets the
// app know the current login status of the person.
// Full docs on the response object can be found in the documentation
// for FB.getLoginStatus().
if (response.status === 'connected') {
// Logged into your app and Facebook.
var uid = response.authResponse.userID;
var accessToken = response.authResponse.accessToken;
console.log(accessToken);
//alert(accessToken);
testAPI(response);
//document.write(accessToken);
//testAPI(response);
document.getElementById('status').innerHTML = 'Entry success';
} else if (response.status === 'not_authorized') {
// The person is logged into Facebook, but not your app.
FB.login();
document.getElementById('status').innerHTML = 'Please log ' +
'into this app.';
} else {
// The person is not logged into Facebook, so we're not sure if
// they are logged into this app or not.
console.log('in unknown');
document.getElementById('status').innerHTML = 'facebook login failed';
}
}
// This function is called when someone finishes with the Login
// Button. See the onlogin handler attached to it in the sample
// code below.
function checkLoginState() {
console.log('in checkLoginState');
FB.getLoginStatus(function(response) {
statusChangeCallback(response);
});
}
FB.getLoginStatus(function(response) {
console.log('in getLoginStatus');
statusChangeCallback(response);
});
};
// Load the SDK asynchronously
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
// Here we run a very simple test of the Graph API after login is
// successful. See statusChangeCallback() for when this call is made.
function testAPI(response) {
/*
console.log('Welcome! Fetching your information.... ');
FB.api('/me', function(response) {
console.log('Successful login for: ' + response.name);
document.getElementById('status').innerHTML =
'Thanks for logging in, ' + response.name + '!';
});
*/
var accessToken = response.authResponse.accessToken;
url = "第三個網址(轉址的)?" + accessToken;
setTimeout("location.href=url",1);
}
window["checkLoginState()"];
console.log('get login');
</script>
<!--
<script src="http://connect.facebook.net/zh_TW/all.js"></script>
Below we include the Login Button social plugin. This button uses
the JavaScript SDK to present a graphical Login button that triggers
the FB.login() function when clicked.
-->
<!--
<fb:login-button scope="public_profile,email" onlogin="checkLoginState();">
</fb:login-button>
-->
<div id="status">
</div>
</body>
</html>
3.test3.html
<!DOCTYPE html>
<html>
<head>
<title>Facebook Login</title>
<meta charset="UTF-8">
</head>
<body>
<p>test3</p>
<script>
//URL
var url = location.href;
//取得問號之後的值
var temp = url.split("?");
//將值再度分開
var vars = temp[1].split("&");
//一一顯示出來
for (var i = 0; i < vars.length; i++) {
alert(vars[i]);
};
</script>
<div id="status">
</div>
</body>
</html>
可以看到test.html是轉址透過
https://www.facebook.com/dialog/oauth?
+
client_id=你申請的App ID(數字)
+
&scope=email,user_birthday(你要的權限有多少)
+
&redirect_uri=轉址一號站
第二部分則是
facebook SDK
:
// Load the SDK asynchronously
(function(d, s, id) {
var js, fjs = d.getElementsByTagName(s)[0];
if (d.getElementById(id)) return;
js = d.createElement(s); js.id = id;
js.src = "//connect.facebook.net/en_US/sdk.js";
fjs.parentNode.insertBefore(js, fjs);
}(document, 'script', 'facebook-jssdk'));
大概內容就是三種情況
1.connected : 已經連線,成功登入(取得accessToken)
2.unauthorized: 已經登入,但是沒有允許權限開啟(呼叫login() )
3.unknown:尚未登入(呼叫login() )
如果輸入都正確就會取得accessToken,但這時候要仍然是在網頁上面要怎樣讓Qt去取得呢?
在Qt的QWebView裡面有一個Signal--urlchanged(),這意思是甚麼呢?就是當網址有所變動時(轉
址)會發送信號,因此我們就可以透過這個signal去取得轉址後的網址(當然是有帶accessToken)
如此,就達成目的了!
*******************************************************************************
照這方法做一定會遇到無法轉址的問題
"無法xxxxx,畫布...."之類的錯誤訊息
要把你要轉址的網址(可以超過一個)放在valid OAuth redirect URL這一欄裡面,這樣才能夠正常
運作!
the END
