VC++ non-rectangular form (four corners of the arc) of the code examples, like some form music player, some games and other forms, in addition to angle into a curved, there are rounded corners, oval form and not Rules of the form, I realize the process is to set the dialog background " TRANSPARENT" (transparent), and the message processor WM_CTLCOLORDLG create a " space pen" (NULL) to draw the background of the dialog box, and then TransparenBlt itself the bitmap into the dialog box.

View.h
View.cpp
StdAfx.h
StdAfx.cpp
Resource.h
nonrect.rc
NonRect.mak
NonRect.h
NonRect.dsw
NonRect.dsp
NonRect.dep
NonRect.cpp
nonrect.aps
NonRect.001
makefile
MainFrm.h
MainFrm.cpp
Doc.h
Doc.cpp
RES\app.ico
...\app.rc2
...\Toolbar.bmp
RES

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