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Re: [Carbon] Using Speech in Cocoa

On Sunday, September 30, 2001, at 03:55 PM, cocoa-dev-
email@hidden wrote:

I've just started playing around with SpeechSynthesis from one of my
cocoa docklings. What I understand is that I simply need to call
SpeakString (SpeakString([AlarmTitle cString]);) to have the default
voice telling me something. Unfortunately, what it doesn't say what it
should ('Time to go home'), but rather something like 'loren bfx qt".
And if I call the string directly(SpeakString ("Time to go home"), I get
"Time to go home as in FulScreenView" which happens to be the name of
the class. Weird huh?

The problem is that SpeakString() takes a Pascal style string as input, not a C string. In a Pascal string, the first byte holds a number telling how long the string is, and the rest of the bytes hold the characters. So when you pass a C string into the function, it takes the first byte as the length and speaks that number of characters, even if it passes the null character that marks the end of the C string.

The easiest way to get a Pascal string from an NSString is to use the CoreFoundation function CFStringGetPascalStringPtr().

SpeakString(CFStringGetPascalStringPtr((CFStringRef)AlarmTitle));

You should read the notes at the top of CFString.h regarding some conditions where this function may return NULL.

--
Brian Webster
email@hidden
http://homepage.mac.com/bwebster



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