Re: CFStrings on Win32

[Dave Addey <listmail1 at dsl dot pipex dot com>]

Hi Chris,

Thanks :-)

Firstly, it's defined as part of a parameters struct:

typedef struct
{
    // -------- Input parameters
    UInt32      NumberOfMoviesNeeded;
    UInt32      NumberOfTracksPerMovieNeeded;
    REALstring  FileLocation;

    // other stuff...

} SongLoaderData, *SongLoaderDataRef;


This struct is part of a class called SongLoader.  Because I work on a
background thread on Mac, I actually store the SongLoaderData

extern REALclassDefinition RB_SongLoader;    // forward declaration

struct RB_SongLoaderData
{
    // To be thread-safe, RB only manages a pointer to the memory.  Any
access to the memory itself will be done in a custom way by me!
    // The memory for the parameters themselves is assigned in the class
constructor below
    SongLoaderDataRef    myParametersRef;
};

The data is assigned as follows:

static void RB_SongLoaderConstructor (REALobject instance)
{
    ClassData (RB_SongLoader, instance, RB_SongLoaderData, me);
    
    OSStatus osErr = noErr;
    
    // allocate some thread-safe memory for the parameters
    me->myParametersRef = SongLoaderDataRef(calloc(1,
sizeof(SongLoaderData)));

    // Get a pointer to the parameters, so that we can modify their default
values
    SongLoaderDataRef    myParameters =
(SongLoaderDataRef)me->myParametersRef;

}

The parameters are then passed around by reference to various functions.

The particular code that is causing me a problem is:

        const char *FileLocationCString =
inParameters->FileLocation->CString();
        // this always returns a cstring with weird characters

        CFStringRef FileLocationCFString =
CFStringCreateWithCString(kCFAllocatorDefault, FileLocationCString,
REALGetStringEncoding(inParameters->FileLocation));
        // this works on Mac but not on Win (due to weird characters?) -
returns NULL every time

This is how I get and set the string:


static REALstring FileLocationGetter (REALobject instance, long param)
{
    ClassData (RB_SongLoader, instance, RB_SongLoaderData, me);
    SongLoaderDataRef myParameters = (SongLoaderDataRef)me->myParametersRef;
    return myParameters->FileLocation;
}

static void FileLocationSetter (REALobject instance, long param, REALstring
value)
{
    ClassData (RB_SongLoader, instance, RB_SongLoaderData, me);
    SongLoaderDataRef myParameters = (SongLoaderDataRef)me->myParametersRef;
    myParameters->FileLocation = value;
}



If you can get this working, I¹ll buy you a beer :-)

Dave.

> From: Chris Little <cslittle at mac dot com>
> Reply-To: REALbasic Plugins <realbasic-plugins at lists dot realsoftware dot 
> com>
> Date: Fri, 27 Jan 2006 09:24:41 -0500
> To: REALbasic Plugins <realbasic-plugins at lists dot realsoftware dot com>
> Conversation: CFStrings on Win32
> Subject: Re: CFStrings on Win32
> 
> on 1/27/06 8:48 AM, Dave Addey at listmail1 at dsl dot pipex dot com wrote:
> 
>> Hi all,
>> 
>> Thanks for all of the help with this.  Unfortunately, I still can't get it
>> to work.  All of this approach works for creating a CFString, but Cstring()
>> is still returning weird characters on Windows.  It's specifically the
>> CString from the REALstring which is causing problems, rather than the
>> CFString creation.  For some reason, the CString just isn't coming back out
>> correctly on Windows from within the plugin code.  (It's fine when set and
>> retrieved in RB).
>> 
>> I've spent ages pulling my hair out over this one, so I think I'm going to
>> try a different approach - perhaps using declares for this bit, and then
>> passing in CFObject references to the plugin instead.
> 
> Can you repost your current code.  I'll put it in a plug-in and try it here.
> 
> Chris
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