Mac Forum / Applications / Firefox / Mozilla / May 2005

Ok, I've run into another problem.

I have a need to manually run the event loop occasionally.  In Win32, I
do

   if (::PeekMessage(&msg, nsnull, 0, 0, PM_NOREMOVE)) {
       if (::GetMessage(&msg, nsnull, 0, 0)) {
           wasHandled = PR_FALSE;
           ::NS_HandleEmbeddingEvent(msg, wasHandled);
           if (!wasHandled) {
               ::TranslateMessage(&msg);
               ::DispatchMessage(&msg);
           }
       }
   }

and in Unix I do

   while(gtk_events_pending()) {
       gtk_main_iteration();
   }

So I was thinking in Mac, I could do:

   NSEvent *currentEvent = [NSApp currentEvent];
   [NSApp sendEvent: currentEvent];

So I defined this function prototype in a .h, and implemented it in a
.mm file:

#ifdef __cplusplus
extern "C" {
#endif

JNIEXPORT void JNICALL cocoaProcessEventLoop(void);

#ifdef __cplusplus
}
#endif

The JNIEXPORT and JNICALL things are just macros that expand out
to properly mark the function as an export.

And the function has this simple implementation:

JNIEXPORT void JNICALL cocoaProcessEventLoop(void) {
   NSEvent *currentEvent = [NSApp currentEvent];
   [NSApp sendEvent: currentEvent];
}

However, when I try to link the library containing the C++ and .mm
files I get this error:

ld: cocoa/CocoaBrowserControlCanvas.o illegal reference to symbol:
_NSApp defined in indirectly referenced dynamic library
/System/Library/Frameworks/AppKit.framework/Versions/C/AppKit
ld: cocoa/CocoaBrowserControlCanvas.o illegal reference to symbol:
_objc_msgSend defined in indirectly referenced dynamic library
/usr/lib/libobjc.A.dylib
ld: warning multiple definitions of symbol _finite
/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Libraries/libjava.jnilib(single
module) definition of _finite
/usr/lib/libpthread.dylib(finite.o) definition of _finite
ld: warning multiple definitions of symbol _ldexp
/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Libraries/libjava.jnilib(single
module) definition of _ldexp
/usr/lib/libpthread.dylib(frexpldexp.o) definition of _ldexp
ld: warning multiple definitions of symbol _frexp
/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Libraries/libjava.jnilib(single
module) definition of _frexp
/usr/lib/libpthread.dylib(frexpldexp.o) definition of _frexp
ld: warning multiple definitions of symbol _isnan
/System/Library/Frameworks/JavaVM.framework/Versions/1.4.2/Libraries/libjava.jnilib(single
module) definition of _isnan
/usr/lib/libpthread.dylib(isnan.So) definition of _isnan
/usr/bin/libtool: internal link edit command failed

Can someone please help with this error?

I'm very new to Cocoa so I'm probably doing something simple.