Hello All,
I am attempting to use UnicodeString as a basis for unicode functionality in my C++ libraries, that are in turn going to be used in multiple environments - one of which will be Mac/Cocoa.
One of the aims in my C++ interfaces is to explicitly state when the user has to provide me with Unicode compatible data, and when not - via the use of the ICU UnicodeString object.
I've written a simple test program to see if the Unicode data pumped into a UnicodeString object, can in turn then be used by the NSString Cocoa API. So far, I'm having some, what I believe to be, simple issues, that are stopping me dead. I'm assuming that I've missed something fundamental - either the way in which I'm populating the UnicodeString, or passing it through to the NSString objects is wrong...
Always good, are code examples... what follows is:
- populate UnicodeString with data (via UNICODE_STRING_SIMPLE), in this case, the word 'breakfast' in German
- get a (const char *) ptr to that data, and feed it into NSString - telling NSString what format this is (UTF-16 in this case)
- print out the contents of the NSString.
If everything goes well, then the NSString contents will be the same as what I fed the UnicodeString - right?
Not in my case, it all goes bad. I would really appreciate it if someone could cast their eyes over the code below, and perhaps spread some light on the issue.
-- the output produced by the code below --
[Session started at 2006-09-13 15:24:30 +0200.]
2006-09-13 15:24:30.921 UnicodeCPPSpike[2322] UnicodeWord length is 11
2006-09-13 15:24:30.934 UnicodeCPPSpike[2322] the word is: , and 0 in length
2006-09-13 15:24:30.934 UnicodeCPPSpike[2322] the utf8 string, printed simply is:
2006-09-13 15:24:30.934 UnicodeCPPSpike[2322] utf8breakfastLength = 0
2006-09-13 15:24:30.934 UnicodeCPPSpike[2322] converted from cpp's utf8 format, using stringWithUTF8String:
UnicodeCPPSpike has exited with status 0.
-- end of the output --
---- the code ----
int main (int argc, const char * argv[]) {
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
// and the UNICODE_STRING_SIMPLE() will nicely convert my literals into UnicodeString objects, then I've
// got the ICU internal format - i.e. UTF-16. Now should be an easy matter of providing this to the NSString
UnicodeString word( UNICODE_STRING_SIMPLE("Frühstück") );
NSLog(@"UnicodeWord length is %d", word.length());
// the NSString stringWithCString:encoding: doesn't have a Cocoa enum for the
// UTF-16 encoding, but can make one via CFStringConvertEncodingToNSStringEncoding() method
UInt32 encodingUTF16 = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingUTF16);
// create an NSString with this 'word' object, telling NSString what format the
// unicode chars are using... in this case, the UnicodeString uses UTF-16 internally.
NSString *breakfast = [NSString stringWithCString:(const char *)word.getTerminatedBuffer()
encoding:encodingUTF16];
int breakfastLength = [breakfast length];
NSLog(@"the word is: %@, and %d in length", breakfast, breakfastLength);
// Take the NSString data as UTF-8 and put it into a standard, boring old std::string
const char *utf8breakfast = [breakfast UTF8String];
int utf8breakfastLength = strlen(utf8breakfast);
NSLog(@"the utf8 string, printed simply is: %s", utf8breakfast);
NSLog(@"utf8breakfastLength = %d", utf8breakfastLength);
// hmmm... things are not going well, print this byte by byte...
for(int index = 0; utf8breakfast[index]; ++index)
std::cout << "char " << index << ": " << utf8breakfast[index] << std::endl;
// convert the utf8 back into NSString, we should see 'Frühstück'
NSString *convertedFromCPP = [NSString stringWithUTF8String:utf8breakfast];
NSLog(@"converted from cpp's utf8 format, using stringWithUTF8String: %@", convertedFromCPP);
[pool release];
return 0;
}
---- the end of the code ----
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