wc(視窗類)

視窗類結構體WNDCLASSEX介紹：

一、結構體原型：

typedef struct{

UINTcbSize;

UINTstyle;

WNDPROClpfnWndProc;

intcbClsExtra;

intcbWndExtra;

HINSTANCEhInstance;

HICONhIcon;

HCURSORhCursor;

HBRUSHhbrBackground;

LPCTSTRlpszMenuName;

LPCTSTRlpszClassName;

HICONhIconSm;

} WNDCLASSEX, *PWNDCLASSEX;

二、成員介紹

1、cbSizeWNDCLASSEX的大小。在調用GetClassInfoEx前必須要先設定它值。我們可以用sizeof（WNDCLASSEX）來獲得準確的值。

2、style視窗類的樣式，它的值可以是視窗樣式值的任意組合。可以有以下的值：

Constant/value	Description
CS_BYTEALIGNCLIENT 0x1000	Aligns the window's client area on a byte boundary (in the x direction). This style affects the width of the window and its horizontal placement on the display.
CS_BYTEALIGNWINDOW 0x2000	Aligns the window on a byte boundary (in the x direction). This style affects the width of the window and its horizontal placement on the display.
CS_CLASSDC 0x0040	Allocates one device context to be shared by all windows in the class. Because window classes are process specific, it is possible for multiple threads of an application to create a window of the same class. It is also possible for the threads to attempt to use the device context simultaneously. When this happens, the system allows only one thread to successfully finish its drawing operation.
CS_DBLCLKS 0x0008	Sends a double-click message to the window procedure when the user double-clicks the mouse while the cursor is within a window belonging to the class.
CS_DROPSHADOW 0x00020000	Enables the drop shadow effect on a window. The effect is turned on and off throughSPI_SETDROPSHADOW. Typically, this is enabled for small, short-lived windows such as menus to emphasize their Z order relationship to other windows.
CS_GLOBALCLASS 0x4000	Indicates that the window class is an application global class. For more information, see the "Application Global Classes" section ofAbout Window Classes.
CS_HREDRAW 0x0002	Redraws the entire window if a movement or size adjustment changes the width of the client area.
CS_NOCLOSE 0x0200	DisablesCloseon the window menu.
CS_OWNDC 0x0020	Allocates a unique device context for each window in the class.
CS_PARENTDC 0x0080	Sets the clipping rectangle of the child window to that of the parent window so that the child can draw on the parent. A window with theCS_PARENTDCstyle bit receives a regular device context from the system's cache of device contexts. It does not give the child the parent's device context or device context settings. SpecifyingCS_PARENTDCenhances an application's performance.
CS_SAVEBITS 0x0800	Saves, as a bitmap, the portion of the screen image obscured by a window of this class. When the window is removed, the system uses the saved bitmap to restore the screen image, including other windows that were obscured. Therefore, the system does not sendWM_PAINTmessages to windows that were obscured if the memory used by the bitmap has not been discarded and if other screen actions have not invalidated the stored image. This style is useful for small windows (for example, menus or dialog boxes) that are displayed briefly and then removed before other screen activity takes place. This style increases the time required to display the window, because the system must first allocate memory to store the bitmap.
CS_VREDRAW 0x0001	Redraws the entire window if a movement or size adjustment changes the height of the client area.

wc(視窗類)

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