I am experiencing strange behavior working with native FB library. My
observations are below. I am using the code located at
https://github.com/kevinmcmahon/monotouch-facebook but I don't believe the
issues are related to the code. It seems they are related to MonoTouch or my
lack of understanding of it.
1. When using the code (after setting APP ID), the code does FB login/logout
OK. In this version of the code, an instance of SessionDelegate used for
login is created in ctor of DemoAppViewController.
2. If I create an additional instance of SessionDelegate just before login
and use that for login, I get error. The modified login code in
DemoAppViewController is as follows
void Login()
{
var sessionDelegate = new SessionDelegate(this);
_facebook.Authorize(new string[]{"read_stream",
"offline_access"},
sessionDelegate);
}
The error display is below.
3. If I modify the same function like this, I get a different error. The
error is below the prev error.
void Login()
{
var sessionDelegate = new SessionDelegate(this);
for (int i = 0; i < 10; i++) {
int j = i*i;
}
_facebook.Authorize(new string[]{"read_stream",
"offline_access"},
sessionDelegate);
}
What am I doing wrong here? My purpose is to develop a robust code and
clearly I am missing something here. Thanks in advance.
Error for case 2:
==========
Stacktrace:
at (wrapper managed-to-native)
MonoTouch.ObjCRuntime.Messaging.bool_objc_msgSend_IntPtr
(intptr,intptr,intptr) <IL 0x00027, 0xffffffff>
at FacebookSdk.Facebook.HandleOpenUrl (MonoTouch.Foundation.NSUrl) <IL
0x0002d, 0x000cf>
at FacebookSDKExamples.AppDelegate.HandleOpenURL
(MonoTouch.UIKit.UIApplication,MonoTouch.Foundation.NSUrl) [0x0000a] in
/Users/vinay/Projects/monotouch-facebookbase/FacebookSDKExamples/FacebookSDKExamples/Main.cs:55
at (wrapper runtime-invoke)
<Module>.runtime_invoke_void__this___object_object
(object,intptr,intptr,intptr) <IL 0x0005a, 0xffffffff>
at (wrapper managed-to-native)
MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr)
<IL 0x0009f, 0xffffffff>
at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x00038]
in /Developer/MonoTouch/Source/monotouch/monotouch/UIKit/UIApplication.cs:26
at MonoTouch.UIKit.UIApplication.Main (string[]) [0x00000] in
/Developer/MonoTouch/Source/monotouch/monotouch/UIKit/UIApplication.cs:31
at FacebookSDKExamples.Application.Main (string[]) [0x00000] in
/Users/vinay/Projects/monotouch-facebookbase/FacebookSDKExamples/FacebookSDKExamples/Main.cs:15
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object
(object,intptr,intptr,intptr) <IL 0x00050, 0xffffffff>
Native stacktrace:
0 FacebookSDKExamples 0x000dbcd4
mono_handle_native_sigsegv + 343
1 FacebookSDKExamples 0x0001a5c8
mono_sigsegv_signal_handler + 322
2 libSystem.B.dylib 0x92cc305b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 FacebookSDKExamples 0x00004dbf -[Facebook
handleOpenURL:] + 538
5 ??? 0x0ce15c00 0x0 + 216095744
6 ??? 0x0ce15af0 0x0 + 216095472
7 ??? 0x0ce0e465 0x0 + 216065125
8 ??? 0x0ce0e5eb 0x0 + 216065515
9 FacebookSDKExamples 0x0001a383
mono_jit_runtime_invoke
+ 1332
10 FacebookSDKExamples 0x001f8145 mono_runtime_invoke +
137
11 FacebookSDKExamples 0x002a884f monotouch_trampoline
+
2527
12 UIKit 0x01067125 -[UIApplication
_applicationOpenURL:payload:] + 342
13 UIKit 0x01065412 -[UIApplication
_callApplicationResumeHandlersForURL:payload:] + 131
14 UIKit 0x01076647 -[UIApplication
_handleApplicationResumeEvent:] + 1537
15 UIKit 0x01076039 -[UIApplication
handleEvent:withNewEvent:] + 4127
16 UIKit 0x0106dabf -[UIApplication
sendEvent:] + 71
17 UIKit 0x01072f2e
_UIApplicationHandleEvent + 7576
18 GraphicsServices 0x030e4992 PurpleEventCallback +
1550
19 GraphicsServices 0x030e4a19
PurpleEventSignalCallback + 42
20 CoreFoundation 0x01fc48ff
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
21 CoreFoundation 0x01f2288b
__CFRunLoopDoSources0 +
571
22 CoreFoundation 0x01f21d86 __CFRunLoopRun + 470
23 CoreFoundation 0x01f21840 CFRunLoopRunSpecific
+
208
24 CoreFoundation 0x01f21761 CFRunLoopRunInMode +
97
25 GraphicsServices 0x030e31c4 GSEventRunModal + 217
26 GraphicsServices 0x030e3289 GSEventRun + 115
27 UIKit 0x01076c93 UIApplicationMain +
1160
28 ??? 0x077f0d03 0x0 + 125766915
29 ??? 0x077f0ad4 0x0 + 125766356
30 ??? 0x077f00d4 0x0 + 125763796
31 ??? 0x077efeb6 0x0 + 125763254
32 ??? 0x077f007e 0x0 + 125763710
33 FacebookSDKExamples 0x0001a383
mono_jit_runtime_invoke
+ 1332
34 FacebookSDKExamples 0x001f8145 mono_runtime_invoke +
137
35 FacebookSDKExamples 0x001fa82c
mono_runtime_exec_main +
669
36 FacebookSDKExamples 0x001f9c16
mono_runtime_run_main +
843
37 FacebookSDKExamples 0x000adf0f mono_jit_exec + 200
38 FacebookSDKExamples 0x0000d648 main + 4060
39 FacebookSDKExamples 0x0000c451 _start + 208
40 FacebookSDKExamples 0x0000c380 start + 40
Debug info from gdb:
dyld: could not load inserted library: /Users/vinay/Library/Application
Support/iPhone
Simulator/4.3.2/Applications/1A19A12A-F177-4D9B-ABAE-62A4EC88FBC3/FacebookSDKExamples.app/monotouch-fixes.dylib
=================================================================
Got a SIGSEGV while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================
Error for case 3:
==========
Toplevel exception: System.MissingMethodException: No constructor found for
FacebookSDKExamples.SessionDelegate::.ctor(System.IntPtr)
at System.Activator.CreateInstance (System.Type type, BindingFlags
bindingAttr, System.Reflection.Binder binder, System.Object[] args,
System.Globalization.CultureInfo culture, System.Object[]
activationAttributes) [0x000f1] in
/Developer/MonoTouch/Source/mono/mcs/class/corlib/System/Activator.cs:280
at System.Activator.CreateInstance (System.Type type, System.Object[]
args, System.Object[] activationAttributes) [0x00000] in
/Developer/MonoTouch/Source/mono/mcs/class/corlib/System/Activator.cs:234
at System.Activator.CreateInstance (System.Type type, System.Object[]
args) [0x00000] in
/Developer/MonoTouch/Source/mono/mcs/class/corlib/System/Activator.cs:229
at MonoTouch.ObjCRuntime.Runtime.ConstructNSObject (IntPtr ptr, IntPtr
klass) [0x0000d] in
/Developer/MonoTouch/Source/monotouch/monotouch/ObjCRuntime/Runtime.cs:167
at MonoTouch.ObjCRuntime.Runtime.GetNSObject (IntPtr ptr) [0x0001f] in
/Developer/MonoTouch/Source/monotouch/monotouch/ObjCRuntime/Runtime.cs:210
at MonoTouch.ObjCRuntime.Runtime.GetNSObjectWrapped (IntPtr ptr) [0x00000]
in
/Developer/MonoTouch/Source/monotouch/monotouch/ObjCRuntime/Runtime.cs:227
at (wrapper native-to-managed)
MonoTouch.ObjCRuntime.Runtime:GetNSObjectWrapped (intptr)
at (wrapper managed-to-native)
MonoTouch.ObjCRuntime.Messaging:bool_objc_msgSend_IntPtr
(intptr,intptr,intptr)
at FacebookSdk.Facebook.HandleOpenUrl (MonoTouch.Foundation.NSUrl url)
[0x00000] in <filename unknown>:0
at FacebookSDKExamples.AppDelegate.HandleOpenURL
(MonoTouch.UIKit.UIApplication application, MonoTouch.Foundation.NSUrl url)
[0x0000a] in
/Users/vinay/Projects/monotouch-facebookbase/FacebookSDKExamples/FacebookSDKExamples/Main.cs:55
at (wrapper managed-to-native)
MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String
principalClassName, System.String delegateClassName) [0x00038] in
/Developer/MonoTouch/Source/monotouch/monotouch/UIKit/UIApplication.cs:26
at MonoTouch.UIKit.UIApplication.Main (System.String[] args) [0x00000] in
/Developer/MonoTouch/Source/monotouch/monotouch/UIKit/UIApplication.cs:31
at FacebookSDKExamples.Application.Main (System.String[] args) [0x00000]
in
/Users/vinay/Projects/monotouch-facebookbase/FacebookSDKExamples/FacebookSDKExamples/Main.cs:15
--
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