Re: Can't get static SolidBrush to initialize... what am I missing?
"Stick" <Stick@discussions.microsoft.com> wrote in message
news:1BE4185E-8059-4FA1-98E4-F7C57877506F@microsoft.com
I think I must not be understanding something about initializing
static object. I'm trying to avoid having to re-create SolidBrushes
each time I use a draw() routine. So, I decided that it made sense
to create a static brush to use over and over.
So, in a class .h I declare a static SolidBrush like this:
static SolidBrush brush_Mfd_Blk; // Cannot initialize here
then in the class .cpp file I define & attempt to initialize it like
this:
SolidBrush Cdu::brush_Mfd_Blk( Color(255, 0, 0, 0));
and then attempt to use it in a classes draw() method like this:
m_pGraphics->FillRectangle(&brush_Mfd_Blk, RectF(0, 0, m_bmp_w,
m_bmp_h));
and while everything compiles fine... I can see in the debugger that
the Brush never gets initialilzed! The code works fine if I define
the SolidBrush as an auto var in the draw() routine.
Do you know what I am doing wrong? I am missing something in the
language.
I know very little about GDI+ but...
To call GDI+ functions, you need to first initialize GDI+ with a call to
GdiplusStartup. I'm guessing that you do that in WinMain or in some function
that is called directly or indirectly from WinMain. Since static variables
are initialized before WinMain is entered, you are therefore using GDI+
before the call to GdiplusStartup, so the initialization of your brushes is
failing.
Assuming my diagnosis is correct, you should be able to solve the problem as
follows.
1. Create a class that calls GdiplusStartup in its constructor and
GdiplusShutdown in its destructor.
2. Declare an instance of this class at namespace scope in the .cpp file
prior to your SolidBrush definitions.
Note that if you have definitions of static variables in multiple files,
then you will come up against the "static initialization order fiasco"
http://www.parashift.com/c++-faq-lite/ctors.html#faq-10.15
--
John Carson