[英]Posting to Facebook timeline from iOS gives HTTP 400 on first try
我正在按照facebook SDK上的教程進行操作:
一切似乎都可以正常工作,除了在測試我的應用程序時,我在嘗試發布到Facebook牆的第一次嘗試時遇到HTTP錯誤400(或錯誤代碼5)。 如果我再次在應用程序中按“發布”按鈕,則第二次一切似乎正常。 第一次嘗試時,將用戶發送到facebook應用程序進行身份驗證,然后切換回該應用程序,然后為我提供HTTP400。第二次嘗試時,沒有應用程序切換,並且消息按預期發布到了Facebook牆上。
我試圖弄清楚為什么我的應用在第一次嘗試時就不會發布到牆上/時間軸上。 我的代碼與教程中的代碼相同。
編輯:
忘了提一下,我正在使用一個按鈕同時進行身份驗證和發布到牆上-這是IBAction中的代碼:
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
// The user has initiated a login, so call the openSession method
// and show the login UX if necessary.
[appDelegate openSessionWithAllowLoginUI:YES];
[FBRequestConnection startWithGraphPath:@"me/feed" parameters:postParams HTTPMethod:@"POST" completionHandler:^(FBRequestConnection *connection,id result,NSError *error)
{
NSString *alertText;
if (error) {
alertText = [NSString stringWithFormat:
@"error: domain = %@, code = %d", error.domain, error.code];
} else {
/*alertText = [NSString stringWithFormat:
@"Posted action, id: %@", [result objectForKey:@"id"]];*/
alertText = @"Posted!";
}
// Show the result in an alert
[[[UIAlertView alloc] initWithTitle:@"Facebook" message:alertText delegate:self cancelButtonTitle:@"OK!" otherButtonTitles:nil] show];
}];
我用mkral的有用注釋解決了此問題-代碼更改如下:
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
if (FBSession.activeSession.isOpen) { //session is open so can post right away
[FBRequestConnection startWithGraphPath:@"me/feed" parameters:postParams HTTPMethod:@"POST" completionHandler:^(FBRequestConnection *connection,id result,NSError *error)
{
NSString *alertText;
if (error) {
alertText = [NSString stringWithFormat:
@"error: domain = %@, code = %d", error.domain, error.code];
} else {
alertText = @"Posted!";
}
// Show the result in an alert
[[[UIAlertView alloc] initWithTitle:@"Facebook" message:alertText delegate:self cancelButtonTitle:@"OK!" otherButtonTitles:nil] show];
}];
}
else //session isn't open so authenticate first, then can post when back to app through notification
{
NSLog(@"Facebook Active Session not open");
// The user has initiated a login, so call the openSession method
// and show the login UX if necessary.
[appDelegate openSessionWithAllowLoginUI:YES];
}
因此,我首先檢查是否有活動的會話-如果可以直接發布到牆上/時間線,如果沒有,則打開一個會話。 然后,我注冊了一個通知(在viewDidLoad中),以通知我是否存在會話更改(在這種情況下,如果打開了會話),並且一旦經過身份驗證,它將發布到牆上。
- (void)viewDidLoad
{
[super viewDidLoad];
//register for the session change notification you defined in the app delegate (for example when session changes to logged in)
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(sessionStateChanged:)
name:FBSessionStateChangedNotification
object:nil];
}
- (void)sessionStateChanged:(NSNotification*)notification {
if (FBSession.activeSession.isOpen) {
[FBRequestConnection startWithGraphPath:@"me/feed" parameters:postParams HTTPMethod:@"POST" completionHandler:^(FBRequestConnection *connection,id result,NSError *error)
{
NSString *alertText;
if (error) {
alertText = [NSString stringWithFormat:
@"error: domain = %@, code = %d", error.domain, error.code];
} else {
alertText = @"Posted!";
}
// Show the result in an alert
[[[UIAlertView alloc] initWithTitle:@"Facebook" message:alertText delegate:self cancelButtonTitle:@"OK!" otherButtonTitles:nil] show];
}];
}
}
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