This will be a long post...I hope someone has the patience to read it to the
end :).
I'm working on a Monotouch project that needs to use an Objective C API for
a barcode reader.
The files that come with the API are:
- A static library libScanApi.a.
- A couple of .h and .m helper files (ScanApiHelper.h, ScanApiHelper.m) that
use the objects defined in the libScanApi.a library and facilitate the
integration and usage of the API in an application.
Because the API is quite extensive, I decided to create a new static library
that included the helper files provided by the maker of the API and do
bindings to this new static library. I ended up with following
ApiDefinition.cs:
[BaseType (typeof (NSObject))]
interface SktManager {
[Export ("initWithDelegate:")]
IntPtr Constructor (BarcodeReceivedHandler manager);
//-(void) Open;
[Export ("Open:")]
void Open ();
//-(void) Close;
[Export ("Close:")]
void Close ();
}
[Model]
[BaseType (typeof (NSObject))]
interface BarcodeReceivedHandler {
//- (void)BarcodeReceived NSString*)value;
[Abstract, Export ("BarcodeReceived:")]
void BarcodeReceived (string value);
}
The API documentation mentions that the "External accessory framework" must
be added, so I changed the LinkWith attribute to include this framework:
[assembly: LinkWith ("libSktDLL.a", LinkTarget.ArmV7 | LinkTarget.ArmV6 |
LinkTarget.Simulator, ForceLoad = true, Frameworks ="ExternalAccessory")]
The binding project builds correctly, but the main project that is using the
binding dll (I'm trying to deploy to an iPad) shows the following errors:
/var/folders/hb/f40k80fj0s72pybcz810p_340000gn/T/tmp7166be2e.tmp/libSktDLL.a
Undefined symbols for architecture armv7:
"std::terminate()", referenced from:
-[CommandContext dealloc] in libSktDLL.a(ScanApiHelper.o)
CSktQueue::CSktQueue()in libSktDLL.a(SktQueue.o)
CSktQueue::~CSktQueue()in libSktDLL.a(SktQueue.o)
CSktXmlBracket::~CSktXmlBracket()in libSktDLL.a(SktSimpleXml.o)
CSktXmlTag::CSktXmlTag()in libSktDLL.a(SktSimpleXml.o)
CSktXmlTag::~CSktXmlTag()in libSktDLL.a(SktSimpleXml.o)
CSktXmlParser::Parse(char const*, unsigned long)in
libSktDLL.a(SktSimpleXml.o)
...
"___gxx_personality_sj0", referenced from:
-[CommandContext
initWithParam:ScanObj:ScanDevice:Device:Target:Response:] in
libSktDLL.a(ScanApiHelper.o)
-[CommandContext dealloc] in libSktDLL.a(ScanApiHelper.o)
-[CommandContext doCallback:] in libSktDLL.a(ScanApiHelper.o)
-[ScanApiHelper init] in libSktDLL.a(ScanApiHelper.o)
-[ScanApiHelper isDeviceConnected] in libSktDLL.a(ScanApiHelper.o)
-[ScanApiHelper open] in libSktDLL.a(ScanApiHelper.o)
-[ScanApiHelper removeCommand:] in libSktDLL.a(ScanApiHelper.o)
...
The output shows allot more errors. I've shown the top two for the sake of
brevity.
If I remove the LinkTarget.ArmV7 from the LinkWith attribute, the main
project compiles correctly but the app crashes as soon as I make a call to
the 'Open' method. No exception is thrown, the app just crashes instantly.
I took a look at the Organizer window in Xcode but I don't know how to
interpret the device log information for the crash:
Incident Identifier: 0ABEEDA2-15EA-49B6-82D9-C1346AAA5A5C
CrashReporter Key: 094b535c4ce505f7f3987594c5248358746a1538
Hardware Model: iPad2,2
Process: TestSktDllBinding [5997]
Path:
/var/mobile/Applications/FE82B8DF-C025-4AC3-B474-3726FD42D782/TestSktDllBinding.app/TestSktDllBinding
Identifier: TestSktDllBinding
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2012-08-09 17:34:30.273 +0100
OS Version: iPhone OS 5.1.1 (9B206)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_PROTECTION_FAILURE at 0x2fd00fc0
Crashed Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 TestSktDllBinding 0x00501978 monotouch_trampoline
(monotouch-glue.m:804)
1 TestSktDllBinding 0x0018ae44
wrapper_managed_to_native_MonoTouch_ObjCRuntime_Messaging_void_objc_msgSend_IntPtr_intptr_intptr_intptr
(monotouch.dll.7.s:32355)
2 TestSktDllBinding 0x00345014
wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
(mscorlib.dll.7.s:149759)
3 TestSktDllBinding 0x00451728
mono_jit_runtime_invoke (mini.c:5786)
4 TestSktDllBinding 0x004c1e18 mono_runtime_invoke
(object.c:2757)
5 TestSktDllBinding 0x00502610 monotouch_trampoline
(monotouch-glue.m:808)
6 TestSktDllBinding 0x0018ae44
wrapper_managed_to_native_MonoTouch_ObjCRuntime_Messaging_void_objc_msgSend_IntPtr_intptr_intptr_intptr
(monotouch.dll.7.s:32355)
7 TestSktDllBinding 0x00345014
wrapper_runtime_invoke_object_runtime_invoke_dynamic_intptr_intptr_intptr_intptr
(mscorlib.dll.7.s:149759)
....
I've tried to use the static library that I created in another Xcode project
and it worked fine. Am I doing something wrong regarding the bindings?
Thanks
--
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http://monotouch.2284126.n4.nabble.com/Problems-creating-bindings-to-a-barcode-reader-API-tp4656449.html
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