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Crash when loading a dataset from Documents

September 20, 2012 - 2:04am #1

Vuforia works fine when datasets are loaded from application bundle (readonly). The relevant call in QCARUtils.mm looks like this:

 

dataSet->load("MyDataSet.xml", QCAR::DataSet::STORAGE_APPRESOURCE);

 

When I try to load the same dataset from within Documents directory (writable), using the following call:

 

dataSet->load("/var/mobile/Applications/{APPID}/Documents/vuforia/MyDataSet.xml", QCAR::DataSet::STORAGE_ABSOLUTE);

 

I get some logs ending with "ImageTracker: Successfully created dataset" and then application crashes without any meaningful stacktrace. Here is console output:

 

2012-09-20 15:31:40.978 MyApp[7489:6407] INFO/AR(7489) 2012-09-20 15:31:40: ImageTracker: Successfully created dataset

[Switching to process 9731 thread 0x2603]

[Switching to process 9731 thread 0x2603]

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

        DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

        DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

        DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

        DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

Dwarf Error: Cannot find type of die [in module /Users/user/Library/Developer/Xcode/DerivedData/MyApp-eufzcreuyiqvfvgurkichzoloupf/Build/Products/Debug-iphoneos/MyApp.app.dSYM/Contents/Resources/DWARF/MyApp]      DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

(gdb) bt

#0  0x37a4af7e in objc_msgSend ()

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

        DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

Die: DW_TAG_<unknown> (abbrev = 100, offset = 1016726)

    has children: FALSE

    attributes:

        DW_AT_type (DW_FORM_ref4) constant ref: 1016731 (adjusted)

Dwarf Error: Cannot find type of die [in module /Users/user/Library/Developer/Xcode/DerivedData/MyApp-eufzcreuyiqvfvgurkichzoloupf/Build/Products/Debug-iphoneos/MyApp.app.dSYM/Contents/Resources/DWARF/MyApp]

 

 

I've get this with iPhone 4 (iOS 5.0.1, without modifications) and 4S (5.1.1, jailbroken). Both devices are GSM, if it's relevant.

XCode 4.4.1, OSX 10.7.4

Native app, not Unity.

 

I see that Android guys are able to load datasets from writable directories. Has anyone tried the same on iOS?

Crash when loading a dataset from Documents

September 20, 2012 - 2:29am #2

Hi Serban,

Yes this should work, and it should be relatively straightforward.

Please see this thread which also shows a better way to get the applications documents directory using NSHomeDirectory()

https://ar.qualcomm.at/content/read-xml-document-folder

Let me know if you are still having problems.

N

 

 

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