handle to char*

LongJumper

Unregistered

Post: #1

May 18, 2005 — 08:12 PM

I can't remember how to do this.

I'm getting a handle that contains text data from TXNGetData, and need to turn it into a c-string.

LongJumper

Unregistered

Post: #2

May 18, 2005 — 11:09 PM

Well, I got it, and it was a pain in the ass. But here is the solution for someone else who stumbles upon the many ridicolous problems that are associated with it:

Code:

//Getting a cstring from a TXNObject - harder than it should be.

    ControlID id;

    Handle h;

    HIViewRef textField;

    TXNObject t;

    TXNDataType runType;

    UInt32 startOffset, endOffset;

    CFRange range;

    CFIndex len;

    //which control has the text field

    id.signature = APP_CODE;

    id.id = TEXT_FIELD;

    //Get the HIView associated with contorl

    HIViewFindByID(HIViewGetRoot(FrontWindow()),id, &textField);

    //Get the TXNOBject associated with the HIView->ControlRef

    t = HITextViewGetTXNObject(textField);

    //Find where the text is in it

    TXNGetIndexedRunInfoFromRange(t, 0, 0, TXNDataSize(t), &startOffset, &endOffset, &runType, 0, NULL);

    //Get the actual data into a handle

    TXNGetData(t, startOffset, endOffset, &h);

    //Create a CFData reference to the data, which we will make a string with

    HLock(h);

        CFDataRef stringData = CFDataCreate(kCFAllocatorDefault, (UInt8*)*h, GetHandleSize(h));

    HUnlock(h);

    //Don't need the handle anmore, get rid of it

    DisposeHandle(h);

    //Now build the first string from the CFData we've created

    CFStringRef stringRef = CFStringCreateFromExternalRepresentation(kCFAllocatorDefault, stringData, kCFStringEncodingUnicode);

    //We no longer need that data now

    CFRelease(stringData);

    //Now, create a UniChar array of the characters so we can make a new string

    //Get the length and position of the string

    len = CFStringGetLength(stringRef);

    range.location = 0;

    range.length = len;

    //build the actual string

    UniChar* uStr = new UniChar[len];

    CFStringGetCharacters(stringRef, range, uStr);

    //no longer need the first string

    CFRelease(stringRef);

    //Make another cfstring, because going from cfdata->cfstringref->cstring doesn't work in this situation

    CFStringRef toCstr = CFStringCreateWithCharacters(kCFAllocatorDefault, uStr, len);

    //Now turn THIS one into a c string

    const char* cstr = CFStringGetCStringPtr(toCstr, kCFStringEncodingMacRoman);

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