Hi, the Logs say that you have not implemented initCloudReco() in native code:

Caused by: java.lang.UnsatisfiedLinkError: Native method not found: com.qualcomm.QCARSamples.ImageTargets.ImageTargets.initCloudReco:()I

Could you check that you have that function in your ImageTargets.cpp file ?

Thanks for your reply.

I was checked my ImageTargets.cpp. But initCloudReco() in ImageTarget.cpp was well entered.

This is my initCloudReco() in ImageTargets.cpp.

If initCloudReco() is right where i find next?

------------------------------------------------------------------------------------------------ ImageTargets.cpp (initCloudReco)

JNIEXPORT int JNICALL
Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_initCloudReco(JNIEnv *, jobject)
{
 LOG("Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_initCloudReco");

 QCAR::TrackerManager& trackerManager = QCAR::TrackerManager::getInstance();
 QCAR::ImageTracker* imageTracker = static_cast<QCAR::ImageTracker*>(
   trackerManager.getTracker(QCAR::Tracker::IMAGE_TRACKER));
 assert(imageTracker != NULL);

 //Get the TargetFinder:
 QCAR::TargetFinder* targetFinder = imageTracker->getTargetFinder();
 assert(targetFinder != NULL);

 // Start initialization:
 if (targetFinder->startInit(kAccessKey, kSecretKey))
 {
  targetFinder->waitUntilInitFinished();
 }

 int resultCode = targetFinder->getInitState();
 if ( resultCode != QCAR::TargetFinder::INIT_SUCCESS)
 {
  LOG("Failed to initialize target finder.");
  return resultCode;
 }

 // Use the following calls if you would like to customize the color of the UI
 // targetFinder->setUIScanlineColor(1.0, 0.0, 0.0);
 // targetFinder->setUIPointColor(0.0, 0.0, 1.0);

 return resultCode;
}

---------------------------------------------------------------------------------------- ImageTargets.java (initCloudRecoTask)

    /** An async task to initialize cloud-based recognition asynchronously. */
    private class InitCloudRecoTask extends AsyncTask<Void, Integer, Boolean>
    {
        // Initialize with invalid value
        private int mInitResult = -1;

        protected Boolean doInBackground(Void... params)
        {
            // Prevent the onDestroy() method to overlap:
            synchronized (mShutdownLock)
            {
                // Init cloud-based recognition:
                mInitResult = initCloudReco();
                return mInitResult == INIT_SUCCESS;
            }
        }


        protected void onPostExecute(Boolean result)
        {
            DebugLog.LOGD("InitCloudRecoTask::onPostExecute: execution "
                    + (result ? "successful" : "failed"));

            if (result)
            {
                // Done loading the tracker, update application status:
                updateApplicationStatus(APPSTATUS_INITED);

                // Hides the Loading Dialog
                loadingDialogHandler.sendEmptyMessage(HIDE_LOADING_DIALOG);

                mUILayout.setBackgroundColor(Color.TRANSPARENT);
            }
            else
            {
                // Create dialog box for display error:
                AlertDialog dialogError = new AlertDialog.Builder(
                  ImageTargets.this).create();
                dialogError.setButton(DialogInterface.BUTTON_POSITIVE,
                        getString(R.string.button_OK),
                        new DialogInterface.OnClickListener()
                        {
                            public void onClick(DialogInterface dialog,
                                    int which)
                            {
                                // Exiting application
                                System.exit(1);
                            }
                        });

                // Show dialog box with error message:
                String logMessage = "Failed to initialize CloudReco.";

                // NOTE: Check if initialization failed because the device is
                // not supported. At this point the user should be informed
                // with a message.
                if (mInitResult == INIT_ERROR_NO_NETWORK_CONNECTION)
                    logMessage = "Failed to initialize CloudReco because "
                            + "the device has no network connection.";
                else if (mInitResult == INIT_ERROR_SERVICE_NOT_AVAILABLE)
                    logMessage = "Failed to initialize CloudReco because "
                            + "the service is not available.";

                dialogError.setMessage(logMessage);
                dialogError.show();
            }
        }
    }

I see; but the runtime Log says that it cannot find initCloudReco() at runtime, for some reasons;

have you run ndk-build and refreshed the project in Eclipse ?

Thank you so much AlessandroB!

I had forgotten the ndk-build ..

So Ndk-build again to clear the existing obj folder.

But got another problem.

ndk-build
Cygwin         : Generating dependency file converter script
Compile++ arm    : ImageTargets <= ImageTargets.cpp
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_startCamera(JNIEnv*, jobject)':
jni/ImageTargets.cpp:728:55: error: 'class QCAR::Tracker' has no member named 'getTargetFinder'
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_stopCamera(JNIEnv*, jobject)':
jni/ImageTargets.cpp:749:54: error: 'class QCAR::Tracker' has no member named 'getTargetFinder'
/cygdrive/c/workspace/android-ndk-r8d/build/core/build-binary.mk:269: recipe for target `obj/local/armeabi/objs/ImageTargets/ImageTargets.o' failed
make: *** [obj/local/armeabi/objs/ImageTargets/ImageTargets.o] Error 1

I don't know why 'class QCAR::Tracker' has no member named 'getTargetFinder' ..

Can you read my ImageTarget.cpp and ImageTarget.java code ?

If you can, I'm going to send email ..

Always, thank you for your answers.    :)

Thank you so much AlessandroB!

I had forgotten the ndk-build ..

And Some errors have been modified and perfected.

Thanks to you !!!      :) 

Great, glad to help :-)

4aries17 wrote:

Thank you so much AlessandroB!

I had forgotten the ndk-build ..

So Ndk-build again to clear the existing obj folder.

But got another problem.

ndk-build
Cygwin         : Generating dependency file converter script
Compile++ arm    : ImageTargets <= ImageTargets.cpp
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_startCamera(JNIEnv*, jobject)':
jni/ImageTargets.cpp:728:55: error: 'class QCAR::Tracker' has no member named 'getTargetFinder'
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_stopCamera(JNIEnv*, jobject)':
jni/ImageTargets.cpp:749:54: error: 'class QCAR::Tracker' has no member named 'getTargetFinder'
/cygdrive/c/workspace/android-ndk-r8d/build/core/build-binary.mk:269: recipe for target `obj/local/armeabi/objs/ImageTargets/ImageTargets.o' failed
make: *** [obj/local/armeabi/objs/ImageTargets/ImageTargets.o] Error 1

I don't know why 'class QCAR::Tracker' has no member named 'getTargetFinder' ..

Can you read my ImageTarget.cpp and ImageTarget.java code ?

If you can, I'm going to send email ..

Always, thank you for your answers.    :)

I have the same problem,

"Compile++ arm  : ImageTargets <= ImageTargets.cpp
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_startCamera(JNIEnv*, jobject)':
jni/ImageTargets.cpp:755:58: error: 'class QCAR::Tracker' has no member named 'getTargetFinder'
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargets_stopCamera(JNIEnv*, jobject)':
jni/ImageTargets.cpp:774:54: error: 'class QCAR::Tracker' has no member named 'getTargetFinder'
make: *** [obj/local/armeabi/objs/ImageTargets/ImageTargets.o] Error 1

can you please let me know how did u solve this problem?

I tried refreshing the project and NDK-build several times.

Hi sunilsud,

you need to cast the tracker to ImageTracker, i.e. instead of:

QCAR::Tracker* tracker = ...

use QCAR::ImageTracker* imageTracker = static_cast<QCAR::ImageTracker*>( ....)

I've solved the casting errors in startCamera and stopCamera, but I still get this one:

$ ndk-build
Compile++ arm    : ImageTargets <= ImageTargets.cpp
jni/ImageTargets.cpp: In member function 'virtual void ImageTargets_UpdateCallback::QCAR_onUpdate(QCAR::State&)':
jni/ImageTargets.cpp:127:7: error: 'state' was not declared in this scope
make: *** [obj/local/armeabi/objs/ImageTargets/ImageTargets.o] Error 1

This is my onUpdate function:

virtual void QCAR_onUpdate(QCAR::State& /*state*/)
    {
        //NEW code for Cloud Reco
		QCAR::TrackerManager& trackerManager = QCAR::TrackerManager::getInstance();
		QCAR::ImageTracker* imageTracker = static_cast<QCAR::ImageTracker*>(
					  trackerManager.getTracker(QCAR::Tracker::IMAGE_TRACKER));
		 
		// Get the target finder:
		QCAR::TargetFinder* targetFinder = imageTracker->getTargetFinder();
		 
		// Check if there are new results available:
		const int statusCode = targetFinder->updateSearchResults();
		 
		if (statusCode < 0)
		{
			char errorMessage[80];
		 
			sprintf(errorMessage, "Error with status code %d at frame %d", statusCode, 
						state.getFrame().getTimeStamp());
		}
		else if (statusCode == QCAR::TargetFinder::UPDATE_RESULTS_AVAILABLE)
		{
			// Process new search results
			if (targetFinder->getResultCount() > 0)
			{
				const QCAR::TargetSearchResult* result = targetFinder->getResult(0);
		 
				// Check if this target is suitable for tracking:
				if (result->getTrackingRating() > 0)
				{
					// Create a new Trackable from the result:
					QCAR::Trackable* newTrackable = targetFinder->enableTracking(*result);
		 
					 if (newTrackable != 0)
					 {
						 LOG("Successfully created new trackable '%s' with rating '%d'.",
		 
						 newTrackable->getName(), result->getTrackingRating());
		 
						 if (strcmp(result->getUniqueTargetId(), lastTargetId) != 0)
						 {
							  // If the target has changed...
							  // app-specific: do something 
							  // (e.g. generate new 3D model or texture)
						  }
		 
						  strcpy(lastTargetId, result->getUniqueTargetId());
		 
						  // Stop Cloud Reco scanning
						  targetFinder->stop();
		 
						  scanningMode = false;
						  showStartScanButton = true;
					  }
			}
		}
	}
}

I can compile the original .cpp correctly, but it doesn't use that State variable either. Any idea where this is coming from?

Hi, just replace this line:

virtual void QCAR_onUpdate(QCAR::State& /*state*/)

with this:

virtual void QCAR_onUpdate(QCAR::State& state)

Thanks for such a quick answer, that solved that error and I could build the project. Thing is, I'm trying to modify this project so I get a message in Java with the Trackable's name, using this tutorial: https://developer.vuforia.com/resources/dev-guide/open-web-site-and-display-toast-target-detection, and now I got a new error:

$ ndk-build
Compile++ arm    : ImageTargets <= ImageTargets.cpp
jni/ImageTargets.cpp: In function 'void Java_com_qualcomm_QCARSamples_ImageTargets_ImageTargetsRenderer_renderFrame(JNIEnv*, jobject)':
jni/ImageTargets.cpp:500:46: error: 'class QCAR::State' has no member named 'getActiveTrackable'
make: *** [obj/local/armeabi/objs/ImageTargets/ImageTargets.o] Error 1

I've been using it in my older project and I never got that error. I was using the ImageTargets example from 1.5.9, but now I want to use Cloud Recognition and I'm trying to start the project again. Right now I have the ImageTargets with Cloud Reco, but when I replace the 'for' loop from the tutorial i get that last error. Do I have to cast the state or is it something else?

// Get the trackable:
    const QCAR::Trackable* trackable = state.getActiveTrackable(tIdx);
    // Compare this trackable's id to a globally stored id
    // If this is a new trackable, find the displayMessage java method and
    // call it with the trackable's name
    if (trackable->getId() != lastTrackableId) {
        jstring js = env->NewStringUTF(trackable->getName());
        jclass javaClass = env->GetObjectClass(obj);
        jmethodID method = env->GetMethodID(javaClass, "displayMessage", "(Ljava/lang/String;)V");
        env->CallVoidMethod(obj, method, js);
        lastTrackableId = trackable->getId();
    }

Ok, I think i solved it, I changed all references to trackable: trackable->getId(), to trackabl.getId().

That seemed to do the trick.

Sounds great.