共找到7條詞條名為wc的結果 展開
wc
窗口類
在Windows中運行的程序，大多數都有一個或幾個可以看得見的窗口，而在這些窗口被創建起來之前，操作系統怎麼知道該怎樣創建該窗口，以及用戶操作該窗口的各種消息交給誰處理呢？所以VC在調用Windows的API（CreateWindow或者CreateWindowEx）創建窗口之前，要求程序員必須定義一個窗口類（不是傳統C++意義上的類）來規定所創建該窗口所需要的各種信息，主要包括：窗口的消息處理函數、窗口的風格、圖標、滑鼠、菜單等。
目錄
窗類構介紹：
、構型：
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前必須要先設置它值。我們可以用sizeof（WNDCLASSEX）來獲得準確的值。
2、style窗口類的樣式，它的值可以是窗口樣式值的任意組合。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 through SPI_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 | Disables Closeon 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 the CS_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. Specifying CS_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 send WM_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. |
3、lpfnWndProc指向窗口處理函數（回調函數）。處理窗口事件，像單擊滑鼠會怎樣，右擊滑鼠會怎樣，都是由此函數控制的。
4、cbClsExtra為窗口類的額外信息做記錄，初始化為0。
5、cbWndExtra記錄窗口實例的額外信息，系統初始為0.如果程序使用WNDCLASSEX註冊一個從資源文件里創建的對話框，則此參數必須設置為DLGWINDOWEXTRA
6、hInstance：本模塊的事例句柄。
7、hIcon窗口類的圖標，為資源句柄，如果設置為NULL，系統將為窗口提供一個默認的圖標。
8、hCursor窗口類的滑鼠樣式，為滑鼠樣式資源的句柄，如果設置為NULL，系統提供一個默認的滑鼠樣式。
9、hbrBackground窗口類的背景刷，為背景刷句柄，也可以為系統顏色值，如果顏色值已給出，則必須轉化為以下的HBRUSH的值
·COLOR_ACTIVEBORDER
·COLOR_ACTIVECAPTION
·COLOR_APPWORKSPACE
·COLOR_BACKGROUND
·COLOR_BTNFACE
·COLOR_BTNSHADOW
·COLOR_BTNTEXT
·COLOR_CAPTIONTEXT
·COLOR_GRAYTEXT
·COLOR_HIGHLIGHT
·COLOR_HIGHLIGHTTEXT
·COLOR_INACTIVEBORDER
·COLOR_INACTIVECAPTION
·COLOR_MENU
·COLOR_MENUTEXT
·COLOR_SCROLLBAR
·COLOR_WINDOW
·COLOR_WINDOWFRAME
·COLOR_WINDOWTEXT
10.lpszMenuName指向一個以NULL結尾的字元串，同目錄資源的名字一樣。如果使用整型id表示菜單，可以用MAKEINTRESOURCE定義一個宏。如果它的值為NULL,那麼該類創建的窗口將都沒有默認的菜單。
11.lpszClassName指向窗口類的指針，LPSTR類型。
12.hIconSm小圖標的句柄，在任務欄顯示的圖標，可以和上面的那個一樣。
三、實例
HWND hWND; //窗口句柄變數
MSG msg;//消息結構體變數
WNDCLASSEX wndclass;//窗口類結構體變數
//以下是對wndclass各成員賦值
wndclass.cbSize = sizeof(WNDCLASSEX);
wndclass.cbClsExtra=0;
wndclass.cbWndExtra =0;
wndclass.lpfnWndProc = WinProc;
wndclass.style = CS_VREDRAW | CS_HREDRAW | CS_OWNDC | CS_DBLCLKS;
wndclass.hInstance = hinstance;
wndclass.hCursor =LoadCursor(NULL, IDC_ARROW);
wndclass.hIcon =LoadIcon(NULL,IDI_APPLICATION);
wndclass.hIconSm = LoadIcon(NULL,IDI_APPLICATION) ;
wndclass.lpszMenuName = NULL;
wndclass.hbrBackground =(HBRUSH) GetStockObject(BLACK_BRUSH);
wndclass.lpszClassName =WND_CLS_NAME;
//下面是利用wndcalss結構體的信息註冊一個窗口類
if (!RegisterClassEx(&wndclass))
return 0;
//……
return 0;