You need to understand the errors:

 Property 'arViewSize' cannot be found in forward class object 'CRParentViewController'

This means you have missed a step in my original instruction.  Look for this:

@property (nonatomic) CGSize arViewSize;

HTH

N

Hi,

I'm following your tips but I have these errors:

Great to hear :)

N

Thanks, I've solved them

1 - Click on the project in the Project Navigator, then on the Target and then on Summary.  Scroll down and you should see "Supported Interface Orientations" - so just click on the ones you wish to support and lock out the others.  This should prevent the autorotation messages.  If this doesn't work, then check the Apple docs

2 - What you need to do is not create a new CRViewController each time.  Simply create it once (holding a reference to it) and then push that instance each time. This way it is faster, and the scan line should work.

HTH

N

Thanks . I have rewrite it successfully.

two more questions 

question 1

how can it lock camera screen orientation into portait. 

if current screen orientation is portait, and it pass a self.view.frame.size into CRParentViewCtroller and push a CRParentViewCtroller, the screen work fine.

at this time, i rotate my ipad into landscape, the viewsize is wrong , a part of camera screen become black.

- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
{
   // BOOL retVal = [[CRQCARutils getInstance] shouldAutorotateToInterfaceOrientation:toInterfaceOrientation];
    return NO;
}

i tried to set the return value to No, it still rotate the screen. 

can you suggest me how to block the camera screen into portait  ?

question 2

as i use storyboard to push a CRviewController.

i have a startViewController with a button. as long as i push that button. CRViewController view will be pushed. all thing work fine, (the scanning bar is moving well)

and then i press back button on the navigation bar and push back to view of StartViewController, after i tap the start button on the StartViewController and push CRViewController again, i found the scanning bar is disappeare, but image recongition is working well. 

how can i get back scanning bar when i push CRViewController from view of StartViewController again in this case?

It is difficult to know what to say.

The errors are meaningless to me.

I think the only thing you can do is to start again :(

Sometimes this happens, but it happens to everyone.

In future you will also make sure that you take a project backup.

N

Hi Nalis,

as i lost my use drive with my vuforia project,  and your suggesting code are work for my lost project, thanks again.

  but this time, i rewrite the code. this is still not work. I use your suggesting code and method. but still not working.

can you give me some suggestions!! 

i have printscreen the error in following picture.

http://myweb.polyu.edu.hk/~10519118d/error.png

 CompileC /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/Objects-normal/armv7/StartAppDelegate.o Classes/CloudReco/StartAppDelegate.m normal armv7 objective-c com.apple.compilers.llvm.clang.1_0.compiler

    cd /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7

    setenv LANG en_US.US-ASCII

    setenv PATH "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/bin:/bin:/usr/sbin:/sbin"

    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -x objective-c -arch armv7 -fmessage-length=0 -std=c99 -fobjc-arc -Wno-trigraphs -fpascal-strings -O0 -Wno-missing-field-initializers -Wno-missing-prototypes -Wreturn-type -Wno-implicit-atomic-properties -Wno-receiver-is-weak -Wformat -Wno-missing-braces -Wparentheses -Wswitch -Wno-unused-function -Wno-unused-label -Wno-unused-parameter -Wunused-variable -Wunused-value -Wno-empty-body -Wno-uninitialized -Wno-unknown-pragmas -Wno-shadow -Wno-four-char-constants -Wno-conversion -Wno-constant-conversion -Wno-int-conversion -Wno-enum-conversion -Wno-shorten-64-to-32 -Wpointer-sign -Wno-newline-eof -Wno-selector -Wno-strict-selector-match -Wno-undeclared-selector -Wno-deprecated-implementations -DDEBUG -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -funroll-loops -fstrict-aliasing -Wprotocol -Wdeprecated-declarations -g -fvisibility=hidden -Wno-sign-conversion -miphoneos-version-min=6.1 -iquote /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/CloudReco-generated-files.hmap -I/Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/CloudReco-own-target-headers.hmap -I/Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/CloudReco-all-target-headers.hmap -iquote /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/CloudReco-project-headers.hmap -I/Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Products/Debug-iphoneos/include -I../sdk/build/include -I/Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/DerivedSources/armv7 -I/Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/DerivedSources -F/Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Products/Debug-iphoneos -mfpu=neon -include /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/PrecompiledHeaders/CloudReco_Prefix-emhsgvposyzxyrcndarouttudtfm/CloudReco_Prefix.pch -MMD -MT dependencies -MF /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/Objects-normal/armv7/StartAppDelegate.d --serialize-diagnostics /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/Objects-normal/armv7/StartAppDelegate.dia -c /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/StartAppDelegate.m -o /Users/vincent/Library/Developer/Xcode/DerivedData/CloudReco-garmofjcmcfdvoejikhopqmxrkev/Build/Intermediates/CloudReco.build/Debug-iphoneos/CloudReco.build/Objects-normal/armv7/StartAppDelegate.o

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/StartAppDelegate.m:8:

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/CRQCARutils.h:8:

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:8:

In file included from ../sdk/build/include/QCAR/Tool.h:18:

../sdk/build/include/QCAR/Matrices.h:16:1: error: unknown type name 'namespace'

namespace QCAR

^

../sdk/build/include/QCAR/Matrices.h:16:15: error: expected ';' after top level declarator

namespace QCAR

              ^

              ;

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/StartAppDelegate.m:8:

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/CRQCARutils.h:8:

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:13:

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/Texture.h:19:1: error: unexpected '@' in program

@property (nonatomic, readonly) int height;

^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/Texture.h:20:1: error: unexpected '@' in program

@property (nonatomic) int textureID;

^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/Texture.h:21:1: error: unexpected '@' in program

@property (nonatomic, readonly) unsigned char* pngData;

^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/Texture.h:23:1: error: missing context for method declaration

- (BOOL)loadImage:(NSString*)filename;

^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/Texture.h:25:1: error: expected method body

@end

^

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/StartAppDelegate.m:8:

In file included from /Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/Classes/CloudReco/CRQCARutils.h:8:

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:20:3: warning: type specifier missing, defaults to 'int' [-Wimplicit-int]

} TargetType;

  ^~~~~~~~~~

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:55:5: error: type name requires a specifier or qualifier

    QCAR::DataSet *dataSet;

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:55:10: error: expected expression

    QCAR::DataSet *dataSet;

         ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:60:23: error: type name requires a specifier or qualifier

@property (nonatomic) QCAR::DataSet *dataSet;

                      ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:60:28: error: expected expression

@property (nonatomic) QCAR::DataSet *dataSet;

                           ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:81:5: error: unknown type name 'TargetType'

    TargetType targetType;      // for app to inform QCARutils

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:90:5: error: type name requires a specifier or qualifier

    QCAR::Matrix44F projectionMatrix; // OpenGL projection matrix

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:90:10: error: expected expression

    QCAR::Matrix44F projectionMatrix; // OpenGL projection matrix

         ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:100:5: error: type name requires a specifier or qualifier

    QCAR::DataSet * currentDataSet; // the loaded DataSet

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:100:10: error: expected expression

    QCAR::DataSet * currentDataSet; // the loaded DataSet

         ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:100:5: error: duplicate member 'QCAR'

    QCAR::DataSet * currentDataSet; // the loaded DataSet

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:90:5: note: previous declaration is here

    QCAR::Matrix44F projectionMatrix; // OpenGL projection matrix

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:105:5: error: type name requires a specifier or qualifier

    QCAR::CameraDevice::CAMERA activeCamera;

    ^

/Users/vincent/Development/fyp/Experiment/vuforia/modified_version2.0/CloudReco-2-0-7/ARCommon/QCARutils.h:105:10: error: expected expression

    QCAR::CameraDevice::CAMERA activeCamera;

         ^

fatal error: too many errors emitted, stopping now [-ferror-limit=]

1 warning and 20 errors generated.

After following this technique, I get a black screen before the camera shows the scanning of the image.  I am unable to lay the UIImageView with a default image on top of the black screen.  Let me know if you have any suggestions?

Thanks,

Jack

Awesome!

Glad to hear :)

Thanks, NalinS  , it is work now 

Hi Vincentwts,

This line indicates the problem:

VideoBackgroundConfig with screen size of zero received, skipping config step

Essentially the code is trying to initiate the AR view with a size of (0,0), so you need to find a way of setting this size.

I was able to get this up and running by doing the following:

1 Use a different StartAppDelegate instead of the one that comes with CloudReco:

@interface StartAppDelegate : UIResponder <UIApplicationDelegate>

@end

@implementation StartAppDelegate

@synthesize window = _window;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

{

    // Create the CR-specific QCARutils object to replace the standard one and

    // set the device orientation lock to automatic mode

    CRQCARutils *qUtils = [CRQCARutils getInstance];

    qUtils.deviceOrientationLock = DeviceOrientationLockAuto;

    CGRect screenBounds = [[UIScreen mainScreen] bounds];

//    _window = [[UIWindow alloc] initWithFrame: screenBounds];

    // Override point for customization after application launch - allows my collection view controller rather than the default    

    return YES;

}

- (void)applicationWillResignActive:(UIApplication *)application

{

    // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.

    // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.

}

- (void)applicationDidEnterBackground:(UIApplication *)application

{

    // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.

    // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

}

- (void)applicationWillEnterForeground:(UIApplication *)application

{

    // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{

    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.

}

- (void)applicationWillTerminate:(UIApplication *)application

{

    // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.

}

@end

2 - StartViewController as follows: (note that this has just one instance of CRParentViewController that is created once.  This is the recommened way to start/stop Vuforia, otherwise you will encounter problems.  Note also it sets a new variable in CRParentViewController called arViewSize - which is why it will not be zero.

@class CRParentViewController;

@interface StartViewController : UIViewController

- (IBAction)goButton:(id)sender;

@property (strong, nonatomic) CRParentViewController *cameraViewController;

@end

3 - In CRParentViewController.h add this

@property (nonatomic) CGSize arViewSize;

4 - Replace the following line in loadView

    // need to set size here to setup camera image size for AR

//    arViewController.arViewSize = arViewRect.size;

    // set size so its not zero

    arViewController.arViewSize = arViewSize;

    [parentView addSubview:arViewController.view];

...and if all goes well you should have a CloudReco View controller that gets pushed onto the navigation controller that you can transition in and out of :)

HTH

N