Windows 程式设计

Unicode使得程序更容易地跨越国界。

The handle to a window is one of the most important handles that a Windows program(pardon the expression) handles.

A Windows program can contain more than one window procedure. A window procedure is always associated with a particular window class that you register by calling RegisterClass.

(Remember that one window procedure could be handling messages for multiple windows that were created based on the same window class. The hwnd parameter lets the window procedure know which window is receiving the message.)

If the message field of the message retrieved from the message queue is anything except WM_QUIT (which equals 0x0012), GetMessage returns a nonzero value. A WM_QUIT message causes GetMessage to return 0.

For now,be aware that Windows has a variety of "mapping modes"that govern how the logical coordinates specified in GDI drawing functions are translated to the physical pixel coordinates of the display. The mapping mode is defined in the device context.

The device context also defines a clipping region.