Hello Everyone,
First of all many thanks for making this nice toolkit available to us!
I have a suggestion about improvement I see could be useful. The
scenario is the following:
1. From another win32 application, DLL is loaded using LoadLibrary()
2. Library starts new thread and call FLTK program from this thread.
It does work fine.
3. After job is done, library is unloaded from the program space
using FreeLibrary().
The procedure (1-3) also works under Linux using dlsym().
In fact in both cases I use pthreads :))
The problem is that under Win32 FLTK window class is not unregistered therefore
(1-3) works only once; if DLL is loaded again, FLTK tries to register class
again and CreateWindowEx() function from Fl_win32.cxx fails.
I found a work around by obtaining FLTK class name in UTF16 as the following:
wchar_t class_namew[100];
char class_name[100];
strcpy(class_name, "FLTK");
// convert UTF-8 class_name to wchar_t for RegisterClassExW and
CreateWindowExW
fl_utf8toUtf16(class_name,strlen(class_name), // in
(unsigned short*)class_namew, // out
sizeof(class_namew)/sizeof(wchar_t));
Now in DllMain wheh DLL is unloaded I call
case DLL_PROCESS_DETACH:
HINSTANCE hInst = GetModuleHandle(NULL);
BOOL ret = UnregisterClass(class_namew, hInst);
After these fixes DLL can be loaded and FLTK code used multiple
times.
I would suggest to add something to Fl class to allow user to
unregister class under Win32 on demand, or have access to class ATOM This would
help if class name in future versions would change.
Just a suggestion,
Best Regards,
Mikhail
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