What ogre needs to do when creating a window manually

What you need to do when creating a window manually:
1. Read the configuration file and record the log
Full Screen = Yes
Video mode = 1024x1280
Colourdepth
Fsaa
Fsaaquality
Vsync
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All possible parameters:
Left
Top
Title
Parent?whandle
External?whandle
Vsync
Displayfrequency
Colourdepth
Depthbuffer
Fsaa
Fsaaquality
Border
Outerdimensions
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2. Define dwstyle
Full Screen/window according to Parameter Definition
3. Create and register wndclass
Set the default window Handler
Window icon
Mouse window
4. Call the createwindow Function
5. Add Message Processing (windowseventutilitiesd: _ addrenderwindow)
6. createdevice
7. Add mrendertargets and mprioritisedrendertargets
8. If this is the first window, obtain the d3d device and create the texturemanager.
9. Set the d3dcaps9 Structure
10. If it is a 16-bit deep setting mwbuffer = ture
11. Root: onetimepost1_winit () initialize plugin