如何使用Facebook iOS SDK检索Facebook响应 [英] How to retrieve Facebook response using Facebook iOS SDK

问题描述

我正在使用Facebook iOS SDK for iPhone。我初始化Facebook实例

  facebook = [[Facebook alloc] initWithAppId：kAppId]; 
  

然后我登录：

  [facebook authorize：permissions delegate：self]; 
  

登录Facebook后，我正在执行以下操作获取用户个人资料信息：

  [facebook requestWithGraphPath：@meandDelegate：self]; 
 NSMutableData * response = [fbRequest responseText]; 
 unsigned char * firstBuffer = [response mutableBytes]; 
 NSLog（@Got Facebook Profile：：\％s\\\\
，（char *）firstBuffer）; 
  

但是我在控制台上收到以下内容：

 收到Facebook个人资料：（null）
  

我做错了什么，我相信Facebook的响应是一个json字符串，我正在寻找一个json字符串。

解决方案

我以为可能是应该做一个维基，告诉人们我是怎么做的。因为很多人都面临着类似的问题。

我所做的第一件事就是在Facebook上。

m类我在以下方法中添加了以下语句

 （void）authorizeWithFBAppAuth：（BOOL）tryF​​BAppAuth 
 safariAuth： （BOOL）trySafariAuth 
 trySafariAuth = NO; 
  

这可以防止Safari浏览器页面打开Facebook登录，但会在应用中弹出一个屏幕本身。然后我为Facebook创建了一个帮助类，头文件代码在这里。

  #import< UIKit / UIKit.h> 
 #importFBConnect.h
 
 @interface FaceBookHelper：UIViewController 
< FBRequestDelegate，
 FBDialogDelegate，
 FBSessionDelegate> {
 
 Facebook * facebook; 
 NSArray *权限; 
} 
 
 
 @property（只读）Facebook * facebook; 
 
  - （void）login; 
 
  - （void）getUserInfo：（id）sender; 
 
  - （void）getUserFriendList：（id）sender; 
 
  - （void）postToFriendsWall; 
  

.m文件。

  static NSString * kAppId = @xxx; 
 #define ACCESS_TOKEN_KEY @fb_access_token
 #define EXPIRATION_DATE_KEY @fb_expiration_date
 
 @implementation FaceBookHelper 
 
 @synthesize Facebook; 
 
 ////////////////////////////////////// ////////////////////////////////////////////////// ////// 
 // UIViewController 
 
 / ** 
 *初始化
 * / 
  - （id）init {
 if（self = [super init]）{
 facebook = [[Facebook alloc] initWithAppId：kAppId]; 
 facebook.sessionDelegate = self; 
 permissions = [[NSArray arrayWithObjects：
 @email，@read_stream，@user_birthday，
 @user_about_me，@publish_stream，@offline_access，nil ]留] 
 [自我登录]; 
} 
 return self; 
 
} 
 
 
 ///////////////////////// ////////////////////////////////////////////////// ////////////////// 
 // NSObject 
 
  - （void）dealloc {
 [facebook release]; 
 [权限释放]; 
 [super dealloc]; 
} 
 ////////////////////////////////////// ////////////////////////////////////////////////// //////// 
 //私人
 
 / ** 
 *登录。 
 * / 
  - （void）login {
 //仅当访问令牌无效时授权
 //如果*是*有效，则不需要进行身份验证。只要移动
如果（！[facebook isSessionValid]）{
 [facebook authorize：permissions delegate：self]; 
} 
} 
 
 / ** 
 *这只是你在accessToken上获得保留的地方
 * 
 * * / 
  - （void）fbDidLogin {
 NSLog（@已登录）; 
 NSLog（@访问令牌是％@，facebook.accessToken）; 
 NSLog（@到期日为％@，facebook.expirationDate）; 
 //将值存储在NSUserDefaults 
 NSUserDefaults * defaults = [NSUserDefaults standardUserDefaults]; 
 [defaults setObject：facebook.accessToken forKey：ACCESS_TOKEN_KEY]; 
 [defaults setObject：facebook.expirationDate forKey：EXPIRATION_DATE_KEY]; 
 [默认同步]; 
 //这是登录的最佳地点，因为这里我们知道用户已经登录了
 [self getUserInfo：self]; 
 // [self getUserFriendList：self]; 
 // [self postToFriendsWall]; 
} 
 
  - （void）fbDidNotLogin：（BOOL）已取消{
 NSLog（@无法登录）; 
} 
 
  - （void）getUserInfo：（id）sender {
 [facebook requestWithGraphPath：@meandDelegate：self]; 
} 
 
  - （void）getUserFriendList：（id）sender {
 [facebook requestWithGraphPath：@me / friendsandDelegate：self]; 
} 
 ////////////////////////////////////// ///////////////////// 
 // FBRequestDelegate 
 
 / ** 
 *当Facebook API请求返回响应时调用。这个回调
 *可以让您访问原始响应。在
 *（void）请求之前调用：（FBRequest *）请求didLoad：（id）result，
 *传递解析的响应对象。 
 * / 
  - （void）request：（FBRequest *）request didReceiveResponse :( NSURLResponse *）response {
 NSLog（@Inside didReceiveResponse：received response）; 
 // NSLog（@状态码@，[response statusCode]）; 
 NSLog（@URL @，[响应URL]）; 
} 
 
 / ** 
 *当请求返回并且其响应已解析为
 *对象时调用。结果对象可以是字典，数组，字符串，
 *或数字，具体取决于API响应的格式。如果您需要访问原始响应
 *，请使用：
 * 
 *（void）request：（FBRequest *）请求
 * didReceiveResponse :( NSURLResponse *）响应
 * / 
  - （void）request：（FBRequest *）request didLoad：（id）result {
 NSLog（@Inside didLoad）; 
 if（[result isKindOfClass：[NSArray class]]）{
 result = [result objectAtIndex：0]; 
} 
 //当我们要求用户信息时，会发生这种情况。 
 if（[result isKindOfClass：[NSDictionary class]]）{
 // NSDictionary * hash = result; 
 NSLog（@Birthday：％@，[result objectForKey：@birthday]）; 
 NSLog（@Name：％@，[result objectForKey：@name]）; 
} 
 if（[result isKindOfClass：[NSData class]]）
 {
 NSLog（@Profile Picture）; 
 // [profilePicture release]; 
 // profilePicture = [[UIImage alloc] initWithData：result]; 
} 
 NSLog（@请求返回％@，结果）; 
 // if（[result objectForKey：@owner]）{} 
 
}; 
 
 / ** 
 *当错误阻止Facebook API请求成功完成
 *时调用。 
 * / 
  - （void）request：（FBRequest *）请求didFailWithError：（NSError *）错误{
 // [self.label setText：[error localizedDescription]]; 
}; 
 
 
 //////////////////////////////////// //////////////////////// 
 // FBDialogDelegate 
 
 / ** 
 * UIServer对话框成功返回时调用。 
 * / 
  - （void）dialogDidComplete：（FBDialog *）dialog {
 // [self.label setText：@publish successfully]; 
} 
 
 @end 
  

I am using the Facebook iOS SDK for iPhone. I initialize the Facebook instance

facebook = [[Facebook alloc] initWithAppId:kAppId];

And then I do login:

[facebook authorize:permissions delegate:self];

After I logged in to Facebook I am doing the following to get the user profile information:

[facebook requestWithGraphPath:@"me" andDelegate:self];
NSMutableData *response = [fbRequest responseText];
unsigned char *firstBuffer = [response mutableBytes];
NSLog(@"Got Facebook Profile: : \"%s\"\n", (char *)firstBuffer);

But I get the following on my console:

Got Facebook Profile: "(null)"

What am I doing wrong, also I believe that Facebook response is a json string and I am looking to get a hold of that json string.

解决方案

I thought may be I should make it a wiki and tell the people how I am doing it. because lot of people are facing similar problem.

The first thing that I did was.

In Facebook.m class I added the following statement in the following method

(void)authorizeWithFBAppAuth:(BOOL)tryFBAppAuth
                             safariAuth:(BOOL)trySafariAuth
 trySafariAuth = NO;

This prevents a safari page to get open for the facebook login, but it pops up a screen in app itself. Then i created a helper class for Facebook, the header file code is here.

#import <UIKit/UIKit.h>
#import "FBConnect.h"

@interface FaceBookHelper : UIViewController
<FBRequestDelegate,
FBDialogDelegate,
FBSessionDelegate>{

Facebook    *facebook;
NSArray *permissions;
}


@property(readonly) Facebook *facebook;

- (void)login;

-(void)getUserInfo:(id)sender;

- (void)getUserFriendList:(id)sender;

-(void)postToFriendsWall;

The .m file.

static NSString* kAppId = @"xxx";
#define ACCESS_TOKEN_KEY @"fb_access_token"
    #define EXPIRATION_DATE_KEY @"fb_expiration_date"

@implementation FaceBookHelper

@synthesize facebook;

//////////////////////////////////////////////////////////////////////////////////////////////////
// UIViewController

/**
 * initialization
 */
- (id)init {
    if (self = [super init]) {
        facebook = [[Facebook alloc] initWithAppId:kAppId];
        facebook.sessionDelegate = self;
        permissions =  [[NSArray arrayWithObjects:
                              @"email", @"read_stream", @"user_birthday", 
                              @"user_about_me", @"publish_stream", @"offline_access", nil] retain];
        [self login];
    }
    return self;

}


///////////////////////////////////////////////////////////////////////////////////////////////////
// NSObject

- (void)dealloc {
    [facebook release];
    [permissions release];
    [super dealloc];
}
///////////////////////////////////////////////////////////////////////////////////////////////////
// private

/**
 * Login.
 */
- (void)login {
    // only authorize if the access token isn't valid
    // if it *is* valid, no need to authenticate. just move on
    if (![facebook isSessionValid]) {
           [facebook authorize:permissions delegate:self];
    }
}

/**
 * This is the place only where you will get the hold on the accessToken
 *
 **/
- (void)fbDidLogin {
    NSLog(@"Did Log In");
    NSLog(@"Access Token is %@", facebook.accessToken );
    NSLog(@"Expiration Date is %@", facebook.expirationDate );
    // Store the value in the NSUserDefaults
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:facebook.accessToken forKey:ACCESS_TOKEN_KEY];
    [defaults setObject:facebook.expirationDate forKey:EXPIRATION_DATE_KEY];
    [defaults synchronize];
    // This is the best place to login because here we know that user has already logged in
    [self getUserInfo:self];
    //[self getUserFriendList:self];
    //[self postToFriendsWall];
}

- (void)fbDidNotLogin:(BOOL)cancelled {
    NSLog(@"Failed to log in");
}

    - (void)getUserInfo:(id)sender {
      [facebook requestWithGraphPath:@"me" andDelegate:self];
    }

    - (void)getUserFriendList:(id)sender {
      [facebook requestWithGraphPath:@"me/friends" andDelegate:self];
    }
////////////////////////////////////////////////////////////////////////////////
// FBRequestDelegate

/**
 * Called when the Facebook API request has returned a response. This callback
 * gives you access to the raw response. It's called before
 * (void)request:(FBRequest *)request didLoad:(id)result,
 * which is passed the parsed response object.
 */
- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {
    NSLog(@"Inside didReceiveResponse: received response");
    //NSLog(@"Status Code @", [response statusCode]);
    NSLog(@"URL @", [response URL]);
}

/**
 * Called when a request returns and its response has been parsed into
 * an object. The resulting object may be a dictionary, an array, a string,
 * or a number, depending on the format of the API response. If you need access
 * to the raw response, use:
 *
 * (void)request:(FBRequest *)request
 *      didReceiveResponse:(NSURLResponse *)response
 */
- (void)request:(FBRequest *)request didLoad:(id)result {
    NSLog(@"Inside didLoad");
    if ([result isKindOfClass:[NSArray class]]) {
        result = [result objectAtIndex:0];
    }
    // When we ask for user infor this will happen.
    if ([result isKindOfClass:[NSDictionary class]]){
        //NSDictionary *hash = result;
        NSLog(@"Birthday: %@", [result objectForKey:@"birthday"]);
        NSLog(@"Name: %@", [result objectForKey:@"name"]); 
    }
    if ([result isKindOfClass:[NSData class]])
    {
        NSLog(@"Profile Picture");
        //[profilePicture release];
        //profilePicture = [[UIImage alloc] initWithData: result];
    }
    NSLog(@"request returns %@",result);
    //if ([result objectForKey:@"owner"]) {}

};

/**
 * Called when an error prevents the Facebook API request from completing
 * successfully.
 */
- (void)request:(FBRequest *)request didFailWithError:(NSError *)error {
  //[self.label setText:[error localizedDescription]];
};


////////////////////////////////////////////////////////////////////////////////
// FBDialogDelegate

/**
 * Called when a UIServer Dialog successfully return.
 */
- (void)dialogDidComplete:(FBDialog *)dialog {
//[self.label setText:@"publish successfully"];
}

@end

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