+<H3><a name="newerrors">Why my code fails to compile with strange errors about new operator?</a></H3>
+
+The most common cause of this problem is the memory debugging settings in
+<tt>wx/msw/setup.h</tt>. You have several choices:
+
+<ul>
+ <li> Either disable overloading the global operator new completely by
+ setting <tt>wxUSE_GLOBAL_MEMORY_OPERATORS</tt> and
+ <tt>wxUSE_DEBUG_NEW_ALWAYS</tt> to 0 in this file
+ <li> Or leave them on but do <tt>#undef new</tt> after including any
+ wxWindows headers, like this the memory debugging will be still on
+ for wxWindows sources but off for your own code
+</ul>
+
+Notice that IMHO the first solution is preferable for VC++ users who can use
+the <a href="#vcdebug">VC++ CRT memory debugging features</a> instead.
+
+<H3><a name="mfcport">How do I port MFC applications to wxWindows?</a></H3>
+
+Set up your interface from scratch using wxWindows (especially wxDesigner --
+it'll save you a <i>lot</i> of time) and when you have a shell prepared, you can start
+'pouring in' code from the MFC app, with appropriate
+modifications. This is the approach I have used, and I found
+it very satisfactory. A two-step process then - reproduce the bare
+interface first, then wire it up afterwards. That way you deal
+with each area of complexity separately. Don't try to think MFC
+and wxWindows simultaneously from the beginning - it is easier to
+reproduce the initial UI by looking at the behaviour of the MFC
+app, not its code.
+
+<H3><a name="crash">Why do I sometimes get bizarre crash problems using VC++ 5/6?</a></H3>
+
+Some crash problems can be due to inconsistent compiler
+options (and of course this isn't limited to wxWindows).
+If strange/weird/impossible things start to happen please
+check (dumping IDE project file as makefile and doing text comparison
+if necessary) that the project settings, especially the list of defined
+symbols, struct packing, etc. are exactly the same for all items in
+the project. After this, delete everything (including PCH) and recompile.<P>
+
+VC++ 5's optimization code seems to be broken and can
+cause problems: this can be seen when deleting an object Dialog
+Editor, in Release mode with optimizations on. If in doubt,
+switch off optimisations, although this will result in much
+larger executables. It seems possible that the library can be created with
+strong optimization, so long as the application is not strongly
+optimized. For example, in wxWindows project, set to 'Minimum
+Size'. In Dialog Editor project, set to 'Customize: Favor Small
+Code' (and no others). This will then work.<P>
+
+<H3><a name="makefiles">How are the wxWindows makefiles edited under Windows?</a></H3>
+
+As of wxWindows 2.1, there is a new system written by Vadim Zeitlin, that
+generates the makefiles from templates using tmake.<P>
+
+Here are Vadim's notes:<P>
+
+<blockquote>
+To use these new makefiles, you don't need anything (but see below).
+However, you should NOT modify them because these files will be
+rewritten when I regenerate them using tmake the next time. So, if
+you find a problem with any of these makefiles (say, makefile.b32)
+you'll need to modify the corresponding template (b32.t in this
+example) and regenerate the makefile using tmake.<P>
+
+tmake can be found at
+<a href="http://www.troll.no/freebies/tmake.html" target=_new>www.troll.no/freebies/tmake.html</a>.
+It's a Perl5 program and so it needs Perl (doh). There is a binary for
+Windows (available from the same page), but I haven't used it, so
+I don't know if it works as flawlessly as "perl tmake" does (note
+for people knowing Perl: don't try to run tmake with -w, it won't
+do you any good). Using it extremely simple: to regenerate makefile.b32
+just go to distrib/msw/tmake and type<P>
+
+<pre>tmake -t b32 wxwin.pro -o ../../src/msw/makefile.b32</pre><P>
+
+The makefiles are untested - I don't have any of Borland, Watcom or
+Symantec and I don't have enough diskspace to recompile even with
+VC6 using makefiles. The new makefiles are as close as possible to the
+old ones, but not closer: in fact, there has been many strange things
+(should I say bugs?) in some of makefiles, some files were not compiled
+without any reason etc. Please test them and notify me about any problems.
+Better yet, modify the template files to generate the correct makefiles
+and check them in.<P>
+
+The templates are described in tmake ref manual (1-2 pages of text)
+and are quite simple. They do contain some Perl code, but my Perl is
+primitive (very C like) so it should be possible for anybody to make
+trivial modifications to it (I hope that only trivial modifications
+will be needed). I've tagged the ol makefiles as MAKEFILES_WITHOUT_TMAKE
+in the cvs, so you can always retrieve them and compare the new ones,
+this will make it easier to solve the problems you might have.<P>
+
+Another important file is filelist.txt: it contains the list of all
+files to be compiled. Some of them are only compiled in 16/32 bit mode.
+Some other are only compiled with some compilers (others can't compile
+them) - all this info is contained in this file.<P>
+
+So now adding a new file to wxWindows is as easy as modifying filelist.txt
+(and Makefile.ams for Unix ports) and regenerating the makefiles - no
+need to modify all files manually any more.<P>
+
+ Finally, there is also a file vc6.t which I use myself: this one
+generates a project file for VC++ 6.0 (I didn't create vc5.t because
+I don't need it and can't test it, but it should be trivial to create
+one from vc6.t - probably the only things to change would be the
+version number in the very beginning and the /Z option - VC5 doesn't
+support edit-and=continue). This is not an officially supported way
+of building wxWindows (that is, nobody guarantees that it will work),
+but it has been very useful to me and I hope it will be also for
+others. To generate wxWindows.dsp run<P>
+
+<pre>tmake -t vc6 wxwin.pro -o ../../wxWindows.dsp</pre><P>
+
+Then just include this project in any workspace or open it from VC IDE
+and it will create a new workspace for you.<P>
+
+If all goes well, I'm planning to create a template file for Makefile.ams
+under src/gtk and src/motif and also replace all makefiles in the samples
+subdirectories with the project files from which all the others will be
+generated. At least it will divide the number of files in samples
+directory by 10 (and the number of files to be maintained too).
+</blockquote>
+
+<P>
+
+<H3><a name="vcdebug">How do you use VC++'s memory leak checking instead of that in wxWindows?</a></H3>
+
+Vadim Zeitlin:
+
+<pre>
+On the VC++ level, it's just the matter of calling _CrtSetDbgFlag() in the very
+beginning of the program. In wxWindows, this is done automatically when
+compiling with VC++ in debug mode unless wxUSE_GLOBAL_MEMORY_OPERATORS or
+__NO_VC_CRTDBG__ are defined - this check is done in wx/msw/msvcrt.h which
+is included from app.cpp which then calls wxCrtSetDbgFlag() without any
+ifdefs.
+
+This works quite well: at the end of the program, all leaked blocks with their
+malloc count are shown. This number (malloc count) can be used to determine
+where exactly the object was allocated: for this it's enough to set the variable
+_crtBreakAlloc (look in VC98\crt\srs\dbgheap.c line 326) to this number and
+a breakpoint will be triggered when the block with this number is allocated.
+
+For simple situations it works like a charm. For something more complicated
+like reading uninitialized memory a specialized tool is probably better...
+
+Regards,
+VZ
+</pre>
+
+<P>
+
+<H3><a name="shortcutproblem">Why are menu hotkeys or shortcuts not working in my application?</a></H3>
+
+This can happen if you have a child window intercepting EVT_CHAR events and swallowing
+all keyboard input. You should ensure that event.Skip() is called for all input that
+isn'used by the event handler.
+
+<H3><a name="#regconfig">Why can I not write to the HKLM part of the registry with wxRegConfig?</a></H3>
+
+Currently this is not possible because the wxConfig family of classes is
+supposed to deal with per-user application configuration data, and HKLM is
+only supposed to be writeable by a user with Administrator privileges. In theory,
+only installers should write to HKLM. This is still a point debated by the
+wxWindows developers. There are at least two ways to work around it if you really
+need to write to HKLM.<P>
+
+First, you can use wxRegKey directly, for example:
+
+<pre>
+ wxRegKey regKey;
+
+ wxString idName(wxT("HKEY_LOCAL_MACHINE\\SOFTWARE\\My Company\\My Product\\Stuff\\"));
+ idName += packid;
+
+ regKey.SetName(idName);
+
+ {
+ wxLogNull dummy;
+ if (!regKey.Create())
+ {
+ idName = wxT("HKEY_CURRENT_USER\\SOFTWARE\\My Company\\My Product\\Stuff\\");
+ idName += packid;
+ regKey.SetName(idName);
+ if (!regKey.Create())
+ return FALSE;
+ }
+ }
+
+ if (!regKey.SetValue(wxT("THING"), (long) thing)) err += 1;
+
+ regKey.Close();
+
+</pre>
+
+Or, you can employ this trick suggested by Istvan Kovacs:
+
+<pre>
+class myGlobalConfig : public wxConfig
+{
+ myGlobalConfig() :
+ wxConfig ("myApp", "myCompany", "", "", wxCONFIG_USE_GLOBAL_FILE)
+{};
+ bool Write(const wxString& key, const wxString& value);
+}
+
+bool myGlobalConfig::Write (const wxString& key, const wxString& value)
+{
+ wxString path = wxString ("SOFTWARE\\myCompany\\myApp\\") + wxPathOnly(key);
+ wxString new_path = path.Replace ("/", "\\", true);
+ wxString new_key = wxFileNameFromPath (key);
+ LocalKey().SetName (wxRegKey::HKLM, path);
+ return wxConfig::Write (new_key, value);
+}
+</pre>
projects / wxWidgets.git / blobdiff