func cstrToStr(cstr C.CFStringRef) (goString string) {
len := C.CFStringGetLength(cstr)
buf := make([]byte, len*2)
cbuf := (*C.char)(unsafe.Pointer(&buf[0]))
C.CFStringGetCString(cstr, cbuf, len*2, C.CFStringGetSystemEncoding())
return string(buf)
}
func fromCFString(cstr C.CFStringRef) string {
defer C.CFRelease(C.CFTypeRef(cstr))
var (
buf []C.char
ok C.Boolean
size uint = 1024
)
for ok == C.FALSE {
buf = make([]C.char, size)
ok = C.CFStringGetCString(cstr, &buf[0],
C.CFIndex(len(buf)), C.kCFStringEncodingUTF8)
size *= 2
}
return C.GoString(&buf[0])
}
func getCFDictValueUTF8String(dict C.CFDictionaryRef, key C.CFTypeRef) (string, error) {
valCFStringRef, err := getCFDictValueCFStringRef(dict, key)
if err != nil {
return "", err
}
log.Debugf("valCFStringRef: %#v", valCFStringRef)
if valCFStringRef == nil {
return "", errors.New("getCFDictValueUTF8String: Nil value")
}
strLen := C.CFStringGetLength(valCFStringRef)
log.Debugf("strLen: %d", strLen)
charUTF8Len := C.CFStringGetMaximumSizeForEncoding(strLen, C.kCFStringEncodingUTF8) + 1
log.Debugf("charUTF8Len: %d", charUTF8Len)
cstrBytes := make([]byte, charUTF8Len, charUTF8Len)
if C.Boolean(0) == C.CFStringGetCString(valCFStringRef, (*C.char)(unsafe.Pointer(&cstrBytes[0])), charUTF8Len, C.kCFStringEncodingUTF8) {
return "", errors.New("getCFDictValueUTF8String: CFStringGetCString: failed to convert value to string")
}
return C.GoString((*C.char)(unsafe.Pointer(&cstrBytes[0]))), nil
}