We create pen GUI object by CreatePen() API. CreatePen(fnPenStyle, nWidth, crColor) takes three arguments.
- fnPenStyle - pen style
- nWidth - pen width
- crColor - pen color
|PS_SOLID||Pen is solid.|
|PS_DASH||Pen is dashed. This style is valid only when the pen width is one or less in device units.|
|PS_DOT||Pen is dotted. This style is valid only when the pen width is one or less in device units.|
|PS_DASHDOT||Pen has alternating dashes and dots. This style is valid only when the pen width is one or less in device units.|
|PS_DASHDOTDOT||Pen has alternating dashes and double dots. This style is valid only when the pen width is one or less in device units.|
|PS_NULL||Pen is invisible.|
|PS_INSIDEFRAME||Pen is solid. When this pen is used in any graphics device interface (GDI) drawing function that takes a bounding rectangle, the dimensions of the figure are shrunk so that it fits entirely in the bounding rectangle, taking into account the width of the pen. This applies only to geometric pens.|
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MFC hides WinMain in its framework and includes source file on WinMain(). This explains how framework calls global CWinApp::Initinstance() from entry WinMain.
This is constructed during global C++ objects are constructed and is already available when Windows calls the WinMain function, which is supplied by the ...
Define a custom Window class structure, Register the class name, CreateWindow, Show windows and write message get and dispatch loop statements. Define the Window CallBack procedure and write the handlers.
DispatchMessage() is a API which indirectly triggers the Window CallBack procedure. Message structure members from this function are passed to the CallBack procedure. CallBack procedure should implement event handlers depending on the need of the application.
LPARAM and WPARAM are the two parameters in Window CallBack procedure. They signifies parameters of various events. They are used in handing individual events.
We need to write WinMain and need to follow all these in a Win32 application. However we need not to write much if we are writing an application with MFC ...
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