CFStringRef to std::string function

Author: florianbecker

source/StringExtras.cpp

@@ -54,4 +54,22 @@ namespace vx {
 
     return stringLeftTrim( stringRightTrim( _string, _trim.empty() ? trimmed : _trim ), _trim.empty() ? trimmed : _trim );
   }
+
+#ifdef __APPLE__
+  std::string fromCFStringRef( CFStringRef _stringRef ) {
+
+    if ( auto fastCString = CFStringGetCStringPtr( _stringRef, kCFStringEncodingUTF8 ) ) {
+
+      return std::string( fastCString );
+    }
+
+    auto utf16length = CFStringGetLength( _stringRef );
+    auto maxUtf8len = CFStringGetMaximumSizeForEncoding( utf16length, kCFStringEncodingUTF8 );
+
+    std::string converted( static_cast<std::size_t>( maxUtf8len ), '\0' );
+    CFStringGetCString( _stringRef, converted.data(), maxUtf8len, kCFStringEncodingUTF8 );
+    converted.resize( std::strlen( converted.data() ) );
+    return converted;
+  }
+#endif
 }

source/StringExtras.h

@@ -28,6 +28,11 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+/* apple header */
+#ifdef __APPLE__
+  #include <CoreFoundation/CoreFoundation.h>
+#endif
+
 /* stl header */
 #include <string>
 
@@ -44,4 +49,8 @@ namespace vx {
   // trim from both ends of string (right then left)
   std::string &stringTrim( std::string &_string,
                            const std::string &_trim = {} );
+
+#ifdef __APPLE__
+  std::string fromCFStringRef( CFStringRef _stringRef );
+#endif
 }