How to get localized font names with the CoreText API

gistfile1.cpp

#include <iostream>
#include <CoreText/CTFont.h>
#include <CoreText/CTFontCollection.h>
#include <CoreFoundation/CFString.h>
#include <CoreFoundation/CFBase.h>

void callBack(const void *value, void *context) {
	CTFontDescriptorRef pDesc = static_cast<CTFontDescriptorRef>(value);
    
	CFStringRef pFamilyName = (CFStringRef)CTFontDescriptorCopyAttribute(pDesc, kCTFontFamilyNameAttribute);
	CFStringRef lang = CFSTR("ja");
	CFStringRef pLocalizedName = (CFStringRef)CTFontDescriptorCopyLocalizedAttribute(pDesc, kCTFontFamilyNameAttribute, &lang);
	CFShow(pFamilyName);
	char buf[128];
	CFStringGetCString(pLocalizedName, buf, 128, kCFStringEncodingUTF8);
	std::cout << buf << std::endl;
}


int main(int argc, const char * argv[])
{
    static const int nMaxDictEntries = 8;
    CFMutableDictionaryRef pCFDict = CFDictionaryCreateMutable(NULL,
                                                               nMaxDictEntries,
                                                               &kCFTypeDictionaryKeyCallBacks,
                                                               &kCFTypeDictionaryValueCallBacks);
    
    CFDictionaryAddValue( pCFDict, kCTFontCollectionRemoveDuplicatesOption, kCFBooleanTrue );
    CTFontCollectionRef pCollection = CTFontCollectionCreateFromAvailableFonts( pCFDict );
    CFRelease( pCFDict );
    
    CFArrayRef pFontArray = CTFontCollectionCreateMatchingFontDescriptors(pCollection);
    const long nFont = CFArrayGetCount(pFontArray);
    const CFRange aFullRange = CFRangeMake(0, nFont);
    CFArrayApplyFunction(pFontArray, aFullRange, callBack, 0);
    
    
    
    return 0;
}

Coo! But the code doesn't work for users who uses English system but want to display font name as Japanese...