我正在尝试通过 FBConnect 最新的 SDK 提取用户的基本信息。我的代码很简单：
- (void)viewDidLoad {
[super viewDidLoad];
facebook = [[Facebook alloc] initWithAppId:fbAppId];
NSArray* permissions = [[NSArray arrayWithObjects:@"user_about_me",@"read_stream",nil]retain];
[facebook authorize:permissions delegate:self];
[facebook requestWithGraphPath:@"me" andDelegate:self];
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
fbAppId, @"app_id",
[NSString stringWithFormat: @"Some Text"], @"description",
@"My Test App", @"name",
@"Test Facebook Graph API",@"message",
nil];
[facebook dialog:@"feed" andParams:params andDelegate:self];
}
- (BOOL) application: (UIApplication*) application handleOpenURL:(NSURL *)url {
return [facebook handleOpenURL:url];
}
- (void) fbDidLogin {
NSLog(@"FB didLogin");
}
- (void) fbDidNotLogin:(BOOL)cancelled {
NSLog(@"FB didNotLogin");
}
- (void) request:(FBRequest *)request didLoad:(id)result {
NSLog(@"request-didLoad-result");
}
- (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response {
NSLog(@"received response");
}
到目前为止，一切都很顺利。通过用户墙上的对话框发布提要可以正常工作。当我尝试使用以下方式获取用户的名称等信息时，会出现问题：
[facebook requestWithGraphPath:@"me" andDelegate:self];
但是 fbDidLogin 和 requestDidLoad 都没有被调用。对于 requestDidLoad，我检查了 didLoadRawResponse，因为它在请求 didLoad 之前被调用：
- (void)request:(FBRequest *)request didLoadRawResponse:(NSData*)data {
NSString *response = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
NSLog(@"Response is = %@",response);
[response release];
}
我得到的回应是以下身份验证错误：
{"error":{"type":"OAuthException","message":"An active access token must be used to query information about the current user."}}
原因和解决方法是什么？