iOS Question Error Aquiring Lock

Discussion in 'iOS Questions' started by hwatech, Apr 28, 2019.

  1. hwatech

    hwatech Member Licensed User

    I'm having trouble finding an article in the forum relating to this issue... I'm trying to make a simple db query in b4i 5.51 to fill a b4xcombobox and I am getting the following error:

    Error occurred on line: 46 (common)
    Error acquiring lock. Make sure that all transactions are closed.
    Stack Trace: (
    CoreFoundation __exceptionPreprocess + 331
    libobjc.A.dylib objc_exception_throw + 48
    CoreFoundation +[NSException raise:format:] + 197
    dbtest1 -[B4ISQL getLock] + 147
    dbtest1 -[B4ISQL ExecQuery2::] + 68
    dbtest1 -[b4i_common _fillcombo:] + 496
    dbtest1 -[b4i_common _initialize:::] + 1083
    CoreFoundation __invoking___ + 140
    CoreFoundation -[NSInvocation invoke] + 325
    dbtest1 +[B4I runDynamicMethod:method:throwErrorIfMissing:args:] + 1672
    dbtest1 -[B4IShell runMethod:] + 401
    dbtest1 -[B4IShell raiseEventImpl:method:args::] + 2373
    dbtest1 -[B4IShellBI raiseEvent:event:params:] + 1625
    dbtest1 __33-[B4I raiseUIEvent:event:params:]_block_invoke + 51
    libdispatch.dylib _dispatch_call_block_and_release + 12
    libdispatch.dylib _dispatch_client_callout + 8
    libdispatch.dylib _dispatch_main_queue_callback_4CF + 1276
    CoreFoundation __CFRunLoopRun + 2310
    CoreFoundation CFRunLoopRunSpecific + 626
    GraphicsServices GSEventRunModal + 65
    UIKitCore UIApplicationMain + 140
    dbtest1 main + 112
    libdyld.dylib start + 1
    ??? 0x0 + 1

    If I eliminate the call to the sql.ExecQuery(...) the UI part of the program runs fine, so I'm certain it has to do with the calls to the database.

    I am copying the dbtest1.db from dirassets to dirdocuments using the following:

    Sub CopyDBIfNeeded (Filename As String)
    If File.Exists(File.DirDocuments, Filename) = False Then
    File.Copy(File.DirAssets, Filename, File.DirDocuments, Filename)
    End If
    End Sub

    then executing the following before executing a query:

    sql.Initialize(File.DirDocuments, "dbtest1.db", False)

    I'm using a local Build Server 5.50

    Any help would be appreciated
  2. Erel

    Erel Administrator Staff Member Licensed User

    Please use [code]code here...[/code] tags when posting code.

    Are you ending all transactions? Are you closing all ResultSets?
  3. hwatech

    hwatech Member Licensed User

    Sorry, first time posting, I should have read the first timers doc...

    I just copied an example and this is the first resultset in the program. I'm probably missing something simple but it all works on the Android side. I did verify that the database file is there and the initialize statement seems fine

    Here is the where it's crashing

    Sub fillccombo
    Dim data As List

    '^^ crashes on this statement
        Do While rs.NextRow
    End Sub
  4. Erel

    Erel Administrator Staff Member Licensed User

    The problem is not here. Are you making any non-query commands? Can you upload the project?
  5. hwatech

    hwatech Member Licensed User

    Yes, here's the project, could I have some kind of permission problem on the build server?

    Attached Files:

  6. Erel

    Erel Administrator Staff Member Licensed User

    fillyearcombo is called from Initialize sub. The SQL object is only initialized later.

    You should initialize SQL from the initialize sub of the class. It is a mistake to initialize objects of other modules.
  7. hwatech

    hwatech Member Licensed User

    Thank You, and I was wrong, it wasn't working correctly on the android side. I introduced the common module once I went to b4i, I was doing the initialize in the main because I used DirInternal on the android side and needed to use DirDocuments on the iOS side and I wanted to keep the common module exactly the same for both apps
  8. hwatech

    hwatech Member Licensed User

    I see that DirInternal and DirDocuments are just strings so I can still make it global if I need to

    Thanks Again
  9. Erel

    Erel Administrator Staff Member Licensed User

    You need to learn how to work with XUI. You can then use XUI.DefaultFolder.
  10. techknight

    techknight Well-Known Member Licensed User

    you can use #IF B4I and #IF B4A Statements.
  11. hwatech

    hwatech Member Licensed User

    Thanks to both of you,

    yeah, I found the XUI.DefaultFolder, that's just what I needed, I'm still pretty new to B4X/XUI but I'm picking it up fast
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