54 lines
2.0 KiB
Plaintext
54 lines
2.0 KiB
Plaintext
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Special notes about writing wxMSW code
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======================================
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0. Purpose
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----------
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This is just a collection of various notes which should be useful to anybody
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working on wxMSW codebase, please feel free to add more here.
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This text assumes familiarity with both Windows programming and wxWidgets so it
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doesn't cover any wxWidgets-wide issues not specific to Windows.
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1. Windows headers wrappers
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---------------------------
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In no event should the Windows headers such as <windows.h> or <commctrl.h> be
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included directly. So instead of #include <...> use "wx/msw/wrapwin.h" or
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"wx/msw/wrapcctl.h".
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For convenience it is also possible to replace #include <commdlg.h> and
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<shlobj.h> with #include "wx/msw/wrapcdlg.h" and wrapshl.h but this is less
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vital.
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Also notice that many convenient (albeit undocumented) functions and classes
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are declared in "wx/msw/private.h", please do become familiar with this file
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contents and use the utility classes and functions from it instead of
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duplicating their functionality (which can often be done only in exception
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unsafe way).
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2. Windows features checks
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--------------------------
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All checks of features not present in all Windows versions must be done both at
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compile-time (because, even though we use maximal value for WINVER in our code,
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some compilers come with headers too old to declare them) and at run-time
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(because wxMSW applications should run everywhere).
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The functions wxGetWinVersion() (from wx/msw/private.h) and wxApp::
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GetComCtl32Version() should be used to check Windows and comctl32.dll versions
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respectively.
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Any functions which may not be present in kernel32.dll/user32.dll/... in all
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Windows versions should be resolved dynamically, i.e. using wxDynamicLibrary as
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otherwise any wx application -- even not needing them at all -- would refuse to
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start up on Windows versions not implementing the feature in question. As an
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example, look at AlphaBlt()-related code in src/msw/dc.cpp.
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=== EOF ===
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Author: VZ
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