blocks|key|299641|text|如果您想使用Graph+API来获取当前用户ID，则只需向以下地址发送请求：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|299642|https://graph.facebook.com/me?access_token=...|code-block|syntax|javascript|299643|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you want to use Graph API to get current user ID then just send a request to:

<pre><code>https://graph.facebook.com/me?access_token=...
</code></pre>

blocks|key|3026531|text|facebook的访问令牌看起来和"1249203702%7C2.h1MTNeLqcLqw__.86400.129394400-605430316%7C-WE1iH_CV-afTgyhDPc“很相似。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3026532|如果你使用%7C来分割中间部分，你会得到|3026533|2.h1MTNeLqcLqw__.86400.129394400-605430316|3026534|然后再分成-|3026535|最后部分605430316是用户id。|3026536|下面是从访问令牌中提取用户id的C#代码：|3026537|+++public+long+ParseUserIdFromAccessToken(string+accessToken)
+++{
++++++++Contract.Requires(!string.isNullOrEmpty(accessToken);

++++++++/*
+++++++++*+access_token:
+++++++++*+++1249203702%7C2.h1MTNeLqcLqw__.86400.129394400-605430316%7C-WE1iH_CV-afTgyhDPc
+++++++++*+++++++++++++++++++++++++++++++++++++++++++++++%7C_______%7C
+++++++++*+++++++++++++++++++++++++++++++++++++++++++++++++++%7C
+++++++++*++++++++++++++++++++++++++++++++++++++++++++++++user+id
+++++++++*/

++++++++long+userId+=+0;

++++++++var+accessTokenParts+=+accessToken.Split('%7C');

++++++++if+(accessTokenParts.Length+==+3)
++++++++{
++++++++++++var+idPart+=+accessTokenParts[1];
++++++++++++if+(!string.IsNullOrEmpty(idPart))
++++++++++++{
++++++++++++++++var+index+=+idPart.LastIndexOf('-');
++++++++++++++++if+(index+>=+0)
++++++++++++++++{
++++++++++++++++++++string+id+=+idPart.Substring(index+%2B+1);
++++++++++++++++++++if+(!string.IsNullOrEmpty(id))
++++++++++++++++++++{
++++++++++++++++++++++++return+id;
++++++++++++++++++++}
++++++++++++++++}
++++++++++++}
++++++++}

++++++++return+null;
++++}|code-block|syntax|javascript|3026538|警告：访问令牌的结构没有文档记录，可能并不总是适合上面的模式。使用它的风险自负。|offset|length|style|BOLD|3026539|更新由于Facebook的变化。从加密的访问令牌中获取userid的首选方法如下：|3026540|try
{
++++var+fb+=+new+FacebookClient(accessToken);
++++var+result+=+(IDictionary<string,+object>)fb.Get("/me?fields=id");
++++return+(string)result["id"];
}
catch+(FacebookOAuthException)
{
++++return+null;
}|3026541|entityMap^0|0|0|0|0|0|0|0|0|3|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|15|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|16|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|18|8|@]|9|@]|A|$O|P]]|$1|Q|3|R|5|6|7|19|8|@$S|1A|T|1B|U|V]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1C|8|@$S|1D|T|1E|U|V]]|9|@]|A|$]]|$1|Y|3|Z|5|N|7|1F|8|@]|9|@]|A|$O|P]]|$1|10|3|-4|5|6|7|1G|8|@]|9|@]|A|$]]]|11|$]]

The facebook acess token looks similar too
"1249203702|2.h1MTNeLqcLqw__.86400.129394400-605430316|-WE1iH_CV-afTgyhDPc"

if you extract the middle part by using | to split you get

2.h1MTNeLqcLqw__.86400.129394400-605430316

then split again by -

the last part 605430316 is the user id.

Here is the C# code to extract the user id from the access token:



<pre class="lang-cs prettyprint-override"><code> public long ParseUserIdFromAccessToken(string accessToken)
 {
 Contract.Requires(!string.isNullOrEmpty(accessToken);

 /*
 * access_token:
 * 1249203702|2.h1MTNeLqcLqw__.86400.129394400-605430316|-WE1iH_CV-afTgyhDPc
 * |_______|
 * |
 * user id
 */

 long userId = 0;

 var accessTokenParts = accessToken.Split('|');

 if (accessTokenParts.Length == 3)
 {
 var idPart = accessTokenParts[1];
 if (!string.IsNullOrEmpty(idPart))
 {
 var index = idPart.LastIndexOf('-');
 if (index &gt;= 0)
 {
 string id = idPart.Substring(index + 1);
 if (!string.IsNullOrEmpty(id))
 {
 return id;
 }
 }
 }
 }

 return null;
 }
</code></pre>

WARNING: 
The structure of the access token is undocumented and may not always fit the pattern above. Use it at your own risk.

Update
Due to changes in Facebook.
the preferred method to get userid from the encrypted access token is as follows:

<pre class="lang-cs prettyprint-override"><code>try
{
 var fb = new FacebookClient(accessToken);
 var result = (IDictionary&lt;string, object&gt;)fb.Get("/me?fields=id");
 return (string)result["id"];
}
catch (FacebookOAuthException)
{
 return null;
}
</code></pre>

blocks|key|3240727|text|最简单的方法是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3240728|https://graph.facebook.com/me?fields=id&access_token="xxxxx"|code-block|syntax|javascript|3240729|然后，您将获得只包含userid的json响应。|3240730|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The easiest way is 

<pre><code>https://graph.facebook.com/me?fields=id&amp;access_token="xxxxx"
</code></pre>

then you will get json response which contains only userid.

blocks|key|302007|text|在FacebookSDK+v2.1中(我不能检查旧版本)。我们有|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302008|NSString+*currentUserFBID+=+[FBSession+activeSession].accessTokenData.userID;|code-block|syntax|javascript|302009|然而，根据FacebookSDK中的评论|302010|@讨论可能不会为登录行为(如iOS系统帐户)填充此信息。|302011|因此，您可能应该检查它是否可用，然后是否使用它，或者调用请求来获取用户id。|302012|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

in FacebookSDK v2.1 (I can't check older version). We have

<pre><code>NSString *currentUserFBID = [FBSession activeSession].accessTokenData.userID;
</code></pre>

However according to the comment in FacebookSDK

@discussion This may not be populated for login behaviours such as the iOS system account.

So may be you should check if it is available, and then whether use it, or call the request to get the user id

blocks|key|302016|text|使用最新的API，下面是我使用的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|302017|/*params*/
NSDictionary+*params+=+@{
+++++++++++++++++++++++++@"access_token":+[[FBSDKAccessToken+currentAccessToken]+tokenString],
+++++++++++++++++++++++++@"fields":+@"id"
+++++++++++++++++++++++++};
/*+make+the+API+call+*/
FBSDKGraphRequest+*request+=+[[FBSDKGraphRequest+alloc]
++++++++++++++++++++++++++++++initWithGraphPath:@"me"
++++++++++++++++++++++++++++++parameters:params
++++++++++++++++++++++++++++++HTTPMethod:@"GET"];

[request+startWithCompletionHandler:%5E(FBSDKGraphRequestConnection+*connection,
++++++++++++++++++++++++++++++++++++++id+result,
++++++++++++++++++++++++++++++++++++++NSError+*error)+{
++++NSDictionary+*res+=+result;
++++//res+is+a+dict+that+has+the+key
++++NSLog([res+objectForKey:@"id"]);|code-block|syntax|javascript|302018|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

With the newest API, here's the code I used for it

<pre><code>/*params*/
NSDictionary *params = @{
 @"access_token": [[FBSDKAccessToken currentAccessToken] tokenString],
 @"fields": @"id"
 };
/* make the API call */
FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
 initWithGraphPath:@"me"
 parameters:params
 HTTPMethod:@"GET"];

[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection,
 id result,
 NSError *error) {
 NSDictionary *res = result;
 //res is a dict that has the key
 NSLog([res objectForKey:@"id"]);
</code></pre>

blocks|key|3026673|text|您可以在onSuccess(LoginResult+loginResult)上使用以下代码|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|3026674|3026675|+loginResult.getAccessToken().getUserId();|blockquote|3026676|3026677|entityMap^0|4|Y|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|P|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|Q|8|@]|D|@]|E|$]]|$1|J|3|-4|5|6|7|R|8|@]|D|@]|E|$]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

You can use below code on onSuccess(LoginResult loginResult)

<blockquote>
 loginResult.getAccessToken().getUserId();
</blockquote>

blocks|key|3240833|text|你只需要点击另一个Graph+API：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3240834|https://graph.facebook.com/me?access_token={access-token}|code-block|syntax|javascript|3240835|它还会给出你的电子邮件Id和用户Id+(对于Facebook)。|3240836|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You just have to hit another Graph API:

<pre><code>https://graph.facebook.com/me?access_token={access-token}
</code></pre>

It will give your e-mail Id and user Id (for Facebook) also.

blocks|key|3026714|text|查看此answer，其中描述了如何获取ID响应。首先，您需要创建get+data方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3026715|const+https+=+require('https');
getFbData+=+(accessToken,+apiPath,+callback)+=>+{
++++const+options+=+{
++++++++host:+'graph.facebook.com',
++++++++port:+443,
++++++++path:+`${apiPath}access_token=${accessToken}`,+//+apiPath+example:+'/me/friends'
++++++++method:+'GET'
++++};

++++let+buffer+=+'';+//+this+buffer+will+be+populated+with+the+chunks+of+the+data+received+from+facebook
++++const+request+=+https.get(options,+(result)+=>+{
++++++++result.setEncoding('utf8');
++++++++result.on('data',+(chunk)+=>+{
++++++++++++buffer+%2B=+chunk;
++++++++});

++++++++result.on('end',+()+=>+{
++++++++++++callback(buffer);
++++++++});
++++});

++++request.on('error',+(e)+=>+{
++++++++console.log(`error+from+facebook.getFbData:+${e.message}`)
++++});

++++request.end();
}|code-block|syntax|javascript|3026716|然后只需在需要的时候使用您的方法，如下所示：|3026717|getFbData(access_token,+'/me?fields=id&',+(result)+=>+{
++++++console.log(result);
});|3026718|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/9577611/http-get-request-in-node-js-express^0|3|6|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|F|7|Y|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|Z|8|@]|9|@]|C|$]]|$1|K|3|L|5|F|7|10|8|@]|9|@]|C|$G|H]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Check out this <a href="https://stackoverflow.com/questions/9577611/http-get-request-in-node-js-express">answer</a>, which describes, how to get ID response.
First, you need to create method get data:

<pre><code>const https = require('https');
getFbData = (accessToken, apiPath, callback) =&gt; {
 const options = {
 host: 'graph.facebook.com',
 port: 443,
 path: `${apiPath}access_token=${accessToken}`, // apiPath example: '/me/friends'
 method: 'GET'
 };

 let buffer = ''; // this buffer will be populated with the chunks of the data received from facebook
 const request = https.get(options, (result) =&gt; {
 result.setEncoding('utf8');
 result.on('data', (chunk) =&gt; {
 buffer += chunk;
 });

 result.on('end', () =&gt; {
 callback(buffer);
 });
 });

 request.on('error', (e) =&gt; {
 console.log(`error from facebook.getFbData: ${e.message}`)
 });

 request.end();
}
</code></pre>

Then simply use your method whenever you want, like this:

<pre><code>getFbData(access_token, '/me?fields=id&amp;', (result) =&gt; {
 console.log(result);
});
</code></pre>

I have a Facebook desktop application and am using the <a href="http://en.wikipedia.org/wiki/Facebook_Platform#Graph_API" rel="noreferrer">Graph API</a>.
I am able to get the access token, but after that is done - I don't know how to get the user's ID.

My flow is like this: 

<ol>
<li>I send the user to <a href="https://graph.facebook.com/oauth/authorize" rel="noreferrer">https://graph.facebook.com/oauth/authorize</a> with all required extended permissions.</li>
<li>In my redirect page I get the code from Facebook.</li>
<li>Then I perform a HTTP request to graph.facebook.com/oauth/access_token with my API key and I get the access token in the response.</li>
</ol>

From that point on I can't get the user ID.

How can this problem be solved?

How to get the Facebook user id using the access token

我有一个Facebook桌面应用程序，正在使用。我能够获得访问令牌，但在那之后-我不知道如何获得用户的ID。我的流程是这样的：我将用户发送到，其中包含所有必需的扩展API我的重定向页面我从Facebook获取代码。然后，我使用我的API密钥执行对/oauth/ access _的请求，并在响应中获得访问令牌。从那时起，...

问如何使用访问令牌获取Facebook用户id
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