CWnd Class Members

Initialization Dialog-Box Item Functions Initialization Message Handlers
Window State Functions Data-Binding Functions System Message Handlers
Window Size and Position Menu Functions General Message Handlers
Window Access Functions Tool Tip Functions Control Message Handlers
Update/Painting Functions Timer Functions Input Message Handlers
Coordinate Mapping Functions Alert Functions Nonclient-Area Message Handlers
Window Text Functions Window Message Functions MDI Message Handlers
Scrolling Functions Clipboard Functions Clipboard Message Handlers
Drag-Drop Functions ActiveX Controls Menu Loop Notification
Caret Functions Overridables

Data Members

m_hWnd Indicates the HWND attached to this CWnd.

Construction/Destruction

CWnd Constructs a CWnd object.
DestroyWindow Destroys the attached Windows window.

Initialization

Create Creates and initializes the child window associated with the CWnd object.
PreCreateWindow Called before the creation of the Windows window attached to this CWnd object.
CalcWindowRect Called to calculate the window rectangle from the client rectangle.
GetStyle Returns the current window style.
GetExStyle Returns the window’s extended style.
Attach Attaches a Windows handle to a CWnd object.
Detach Detaches a Windows handle from a CWnd object and returns the handle.
PreSubclassWindow Allows other necessary subclassing to occur before SubclassWindow is called.
SubclassWindow Attaches a window to a CWnd object and makes it route messages through the CWnd’s message map.
UnsubclassWindow Detaches a window from a CWnd object
FromHandle Returns a pointer to a CWnd object when given a handle to a window. If a CWnd object is not attached to the handle, a temporary CWnd object is created and attached.
FromHandlePermanent Returns a pointer to a CWnd object when given a handle to a window. If a CWnd object is not attached to the handle, NULL is returned.
DeleteTempMap Called automatically by the CWinApp idle-time handler and deletes any temporary CWnd objects created by FromHandle.
GetSafeHwnd Returns m_hWnd, or NULL if the this pointer is NULL.
CreateEx Creates a Windows overlapped, pop-up, or child window and attaches it to a CWnd object.
CreateControl Create an OLE control that will be represented in an MFC program by a CWnd object.

Window State Functions

IsWindowEnabled Determines whether the window is enabled for mouse and keyboard input.
EnableWindow Enables or disables mouse and keyboard input.
GetActiveWindow Retrieves the active window.
SetActiveWindow Activates the window.
GetCapture Retrieves the CWnd that has the mouse capture.
SetCapture Causes all subsequent mouse input to be sent to the CWnd.
GetFocus Retrieves the CWnd that currently has the input focus.
SetFocus Claims the input focus.
GetDesktopWindow Retrieves the Windows desktop window.
GetForegroundWindow Returns a pointer to the foreground window (the top-level window with which the user is currently working).
SetForegroundWindow Puts the thread that created the window into the foreground and activates the window.
GetIcon Retrieves the handle to an icon.
SetIcon Sets the handle to a specific icon.
GetWindowContextHelpId Retrieves the help context identifier.
SetWindowContextHelpId Sets the help context identifier.
ModifyStyle Modifies the current window style.
ModifyStyleEx Modifies the window’s extended style.

Window Size and Position

GetWindowPlacement Retrieves the show state and the normal (restored), minimized, and maximized positions of a window.
SetWindowPlacement Sets the show state and the normal (restored), minimized, and maximized positions for a window.
GetWindowRgn Retrieves a copy of the window region of a window.
SetWindowRgn Sets the region of a window.
IsIconic Determines whether CWnd is minimized (iconic).
IsZoomed Determines whether CWnd is maximized.
MoveWindow Changes the position and dimensions of CWnd.
SetWindowPos Changes the size, position, and ordering of child, pop-up, and top-level windows.
ArrangeIconicWindows Arranges all the minimized (iconic) child windows.
BringWindowToTop Brings CWnd to the top of a stack of overlapping windows.
GetWindowRect Gets the screen coordinates of CWnd.
GetClientRect Gets the dimensions of the CWnd client area.

Window Access Functions

ChildWindowFromPoint Determines which, if any, of the child windows contains the specified point.
FindWindow Returns the handle of the window, which is identified by its window name and window class.
GetNextWindow Returns the next (or previous) window in the window manager’s list.
GetOwner Retrieves a pointer to the owner of a CWnd.
SetOwner Changes the owner of a CWnd.
GetTopWindow Returns the first child window that belongs to the CWnd.
GetWindow Returns the window with the specified relationship to this window.
GetLastActivePopup Determines which pop-up window owned by CWnd was most recently active.
IsChild Indicates whether CWnd is a child window or other direct descendant of the specified window.
GetParent Retrieves the parent window of CWnd (if any).
GetSafeOwner Retrieves the safe owner for the given window.
SetParent Changes the parent window.
WindowFromPoint Identifies the window that contains the given point.
GetDlgItem Retrieves the control with the specified ID from the specified dialog box.
GetDlgCtrlID If the CWnd is a child window, calling this function returns its ID value.
SetDlgCtrlID Sets the window or control ID for the window (which can be any child window, not only a control in a dialog box).
GetDescendantWindow Searches all descendant windows and returns the window with the specified ID.
GetParentFrame Retrieves the CWnd object’s parent frame window.
SendMessageToDescendants Sends a message to all descendant windows of the window.
GetTopLevelParent Retrieves the window’s top-level parent.
GetTopLevelOwner Retrieves the top-level window.
GetParentOwner Returns a pointer to a child window’s parent window.
GetTopLevelFrame Retrieves the window’s top-level frame window.
UpdateDialogControls Call to update the state of dialog buttons and other controls.
UpdateData Initializes or retrieves data from a dialog box.
CenterWindow Centers a window relative to its parent.

Update/Painting Functions

BeginPaint Prepares CWnd for painting.
EndPaint Marks the end of painting.
Print Draws the current window in the specified device context.
PrintClient Draws any window in the specified device context (usually a printer device context).
LockWindowUpdate Disables or reenables drawing in the given window.
UnlockWindowUpdate Unlocks a window that was locked with CWnd::LockWindowUpdate.
GetDC Retrieves a display context for the client area.
GetDCEx Retrieves a display context for the client area, and enables clipping while drawing.
RedrawWindow Updates the specified rectangle or region in the client area.
GetWindowDC Retrieves the display context for the whole window, including the caption bar, menus, and scroll bars.
ReleaseDC Releases client and window device contexts, freeing them for use by other applications.
UpdateWindow Updates the client area.
SetRedraw Allows changes in CWnd to be redrawn or prevents changes from being redrawn.
GetUpdateRect Retrieves the coordinates of the smallest rectangle that completely encloses the CWnd update region.
GetUpdateRgn Retrieves the CWnd update region.
Invalidate Invalidates the entire client area.
InvalidateRect Invalidates the client area within the given rectangle by adding that rectangle to the current update region.
InvalidateRgn Invalidates the client area within the given region by adding that region to the current update region.
ValidateRect Validates the client area within the given rectangle by removing the rectangle from the current update region.
ValidateRgn Validates the client area within the given region by removing the region from the current update region.
ShowWindow Shows or hides the window.
IsWindowVisible Determines whether the window is visible.
ShowOwnedPopups Shows or hides all pop-up windows owned by the window.
EnableScrollBar Enables or disables one or both arrows of a scroll bar.

Coordinate Mapping Functions

MapWindowPoints Converts (maps) a set of points from the coordinate space of the CWnd to the coordinate space of another window.
ClientToScreen Converts the client coordinates of a given point or rectangle on the display to screen coordinates.
ScreenToClient Converts the screen coordinates of a given point or rectangle on the display to client coordinates.

Window Text Functions

SetWindowText Sets the window text or caption title (if it has one) to the specified text.
GetWindowText Returns the window text or caption title (if it has one).
GetWindowTextLength Returns the length of the window’s text or caption title.
SetFont Sets the current font.
GetFont Retrieves the current font.

Scrolling Functions

GetScrollPos Retrieves the current position of a scroll box.
GetScrollRange Copies the current minimum and maximum scroll-bar positions for the given scroll bar.
ScrollWindow Scrolls the contents of the client area.
ScrollWindowEx Scrolls the contents of the client area. Similar to ScrollWindow, with additional features.
GetScrollInfo Retrieves the information that the SCROLLINFO structure maintains about a scroll bar.
GetScrollLimit Retrieves the limit of the scroll bar.
SetScrollInfo Sets information about the scroll bar.
SetScrollPos Sets the current position of a scroll box and, if specified, redraws the scroll bar to reflect the new position.
SetScrollRange Sets minimum and maximum position values for the given scroll bar.
ShowScrollBar Displays or hides a scroll bar.
EnableScrollBarCtrl Enables or disables a sibling scroll-bar control.
GetScrollBarCtrl Returns a sibling scroll-bar control.
RepositionBars Repositions control bars in the client area.

Drag-Drop Functions

DragAcceptFiles Indicates the window will accept dragged files.

Caret Functions

CreateCaret Creates a new shape for the system caret and gets ownership of the caret.
CreateSolidCaret Creates a solid block for the system caret and gets ownership of the caret.
CreateGrayCaret Creates a gray block for the system caret and gets ownership of the caret.
GetCaretPos Retrieves the client coordinates of the caret’s current position.
SetCaretPos Moves the caret to a specified position.
HideCaret Hides the caret by removing it from the display screen.
ShowCaret Shows the caret on the display at the caret’s current position. Once shown, the caret begins flashing automatically.

Dialog-Box Item Functions

CheckDlgButton Places a check mark next to or removes a check mark from a button control.
CheckRadioButton Checks the specified radio button and removes the check mark from all other radio buttons in the specified group of buttons.
GetCheckedRadioButton Returns the ID of the currently checked radio button in a group of buttons.
DlgDirList Fills a list box with a file or directory listing.
DlgDirListComboBox Fills the list box of a combo box with a file or directory listing.
DlgDirSelect Retrieves the current selection from a list box.
DlgDirSelectComboBox Retrieves the current selection from the list box of a combo box.
GetDlgItemInt Translates the text of a control in the given dialog box to an integer value.
GetDlgItemText Retrieves the caption or text associated with a control.
GetNextDlgGroupItem Searches for the next (or previous) control within a group of controls.
GetNextDlgTabItem Retrieves the first control with the WS_TABSTOP style that  follows (or precedes) the specified control.
IsDlgButtonChecked Determines whether a button control is checked.
IsDialogMessage Determines whether the given message is intended for the modeless dialog box and, if so, processes it.
SendDlgItemMessage Sends a message to the specified control.
SetDlgItemInt Sets the text of a control to the string that represents an integer value.
SetDlgItemText Sets the caption or text of a control in the specified dialog box.
SubclassDlgItem Attaches a Windows control to a CWnd object and makes it route messages through the CWnd’s message map.
ExecuteDlgInit Initiates a dialog resource.
RunModalLoop Retrieves, translates, or dispatches messages for a window that is in modal status.
ContinueModal Continues a window’s modal status.
EndModalLoop Ends a window’s modal status.

Data-Binding Functions

BindDefaultProperty Binds the calling object’s default simple bound property, as marked in the type library, to a cursor associated with a data-source control.
BindProperty Binds a cursour-bound property on a data-bound control to a data-source control and registers that relationship with the MFC binding manager.
GetDSCCursor Retrieves a pointer to the underlying cursor that is defined by the DataSource, UserName, Password, and SQL properties of a data-source control.

Menu Functions

GetMenu Retrieves a pointer to the specified menu.
SetMenu Sets the menu to the specified menu.
DrawMenuBar Redraws the menu bar.
GetSystemMenu Allows the application to access the Control menu for copying and modification.
HiliteMenuItem Highlights or removes the highlighting from a top-level (menu-bar) menu item.

ToolTip Functions

EnableToolTips Enables the tooltip control.
CancelToolTips Disables the tooltip control.
FilterToolTipMessage Retrieves the title or text associated with a control in a dialog box.
OnToolHitTest Detemines whether a point is in the bounding rectangle of the specified tool and retrieves information about the tool.

Timer Functions

SetTimer Installs a system timer that sends a WM_TIMER message when triggered.
KillTimer Kills a system timer.

Alert Functions

FlashWindow Flashes the window once.
MessageBox Creates and displays a window that contains an application-supplied message and caption.

Window Message Functions

GetCurrentMessage Returns a pointer to the message this window is currently processing. Should only be called when in an OnMessage message-handler member function.
Default Calls the default window procedure, which provides default processing for any window messages that an application does not process.
PreTranslateMessage Used by CWinApp to filter window messages before they are dispatched to the TranslateMessage and DispatchMessage Windows functions.
SendMessage Sends a message to the CWnd object and does not return until it has processed the message.
PostMessage Places a message in the application queue, then returns without waiting for the window to process the message.
SendNotifyMessage Sends the specified message to the window and returns as soon as possible, depending on whether the calling thread created the window.

Clipboard Functions

ChangeClipboardChain Removes CWnd from the chain of Clipboard viewers.
SetClipboardViewer Adds CWnd to the chain of windows that are notified whenever the contents of the Clipboard are changed.
OpenClipboard Opens the Clipboard. Other applications will not be able to modify the Clipboard until the Windows function is called.
GetClipboardOwner Retrieves a pointer to the current owner of the Clipboard.
GetOpenClipboardWindow Retrieves a pointer to the window that currently has the Clipboard open.
GetClipboardViewer Retrieves a pointer to the first window in the chain of Clipboard viewers.

ActiveX Controls

SetProperty Sets an ActiveX control property.
OnAmbientProperty Implement ambient property values.
GetControlUnknown Retrieves a pointer to an unknown ActiveX control.
GetProperty Retrieves an ActiveX control property.
InvokeHelper Invokes an ActiveX control method or property.

Overridables

WindowProc Provides a window procedure for a CWnd. The default dispatches messages through the message map.
DefWindowProc Calls the default window procedure, which provides default processing for any window messages that an application does not process.
PostNcDestroy This virtual function is called by the default OnNcDestroy function after the window has been destroyed.
OnNotify Called by the framework to inform a parent window an event has occurred in one of its controls or that the control needs information.
OnChildNotify Called by a parent window to give a notifying control a chance to respond to a control notification.
DoDataExchange For dialog data exchange and validation. Called by UpdateData.

Initialization Message Handlers

OnInitMenu Called when a menu is about to become active.
OnInitMenuPopup Called when a pop-up menu is about to become active.

System Message Handlers

OnSysChar Called when a keystroke translates to a system character.
OnSysCommand Called when the user selects a command from the Control menu, or when the user selects the Maximize or Minimize button.
OnSysDeadChar Called when a keystroke translates to a system dead character (such as accent characters).
OnSysKeyDown Called when the user holds down the ALT key and then presses another key.
OnSysKeyUp Called when the user releases a key that was pressed while the ALT key was held down.
OnCompacting Called when Windows detects that system memory is low.
OnDevModeChange Called for all top-level windows when the user changes device-mode settings.
OnFontChange Called when the pool of font resources changes.
OnPaletteIsChanging Informs other applications when an application is going to realize its logical palette.
OnPaletteChanged Called to allow windows that use a color palette to realize their logical palettes and update their client areas.
OnSysColorChange Called for all top-level windows when a change is made in the system color setting.
OnWindowPosChanging Called when the size, position, or Z-order is about to change as a result of a call to SetWindowPos or another window-management function.
OnWindowPosChanged Called when the size, position, or Z-order has changed as a result of a call to SetWindowPos or another window-management function.
OnDropFiles Called when the user releases the left mouse button over a window that has registered itself as the recipient of dropped files.
OnSpoolerStatus Called from Print Manager whenever a job is added to or removed from the Print Manager queue.
OnTimeChange Called for all top-level windows after the system time changes.
OnWinIniChange Called for all top-level windows after the Windows initialization file, WIN.INI, is changed.

General Message Handlers

OnCommand Called when the user selects a command.
OnActivate Called when CWnd is being activated or deactivated.
OnActivateApp Called when the application is about to be activated or deactivated.
OnCancelMode Called to allow CWnd to cancel any internal modes, such as mouse capture.
OnChildActivate Called for multiple document interface (MDI) child windows whenever the size or position of CWnd changes or CWnd is activated.
OnClose Called as a signal that CWnd should be closed.
OnCopyData Copies data from one application to another.
OnCreate Called as a part of window creation.
OnCtlColor Called if CWnd is the parent of a control when the control is about to be drawn.
OnDestroy Called when CWnd is being destroyed.
OnEnable Called when CWnd is enabled or disabled.
OnEndSession Called when the session is ending.
OnEnterIdle Called to inform an application’s main window procedure that a modal dialog box or a menu is entering an idle state.
OnEraseBkgnd Called when the window background needs erasing.
OnGetMinMaxInfo Called whenever Windows needs to know the maximized position or dimensions, or the minimum or maximum tracking size.
OnIconEraseBkgnd Called when CWnd is minimized (iconic) and the background of the icon must be filled before painting the icon.
OnKillFocus Called immediately before CWnd loses the input focus.
OnMenuChar Called when the user presses a menu mnemonic character that doesn’t match any of the predefined mnemonics in the current menu.
OnMenuSelect Called when the user selects a menu item.
OnMove Called after the position of the CWnd has been changed.
OnMoving Indicates that a user is moving a CWnd object.
OnDeviceChange Notifies an application or device driver of a change to the hardware configuration of a device or the computer.
OnStyleChanged Indicates that the Windows function has changed one or more of the window's styles.
OnStyleChanging Indicates that the Windows function is about to change one or more of the window's styles.
OnPaint Called to repaint a portion of the window.
OnParentNotify Called when a child window is created or destroyed, or when the user clicks a mouse button while the cursor is over the child window.
OnQueryDragIcon Called when a minimized (iconic) CWnd is about to be dragged by the user.
OnQueryEndSession Called when the user chooses to end the Windows session.
OnQueryNewPalette Informs CWnd that it is about to receive the input focus.
OnQueryOpen Called when CWnd is an icon and the user requests that the icon be opened.
OnSetFocus Called after CWnd gains the input focus.
OnShowWindow Called when CWnd is to be hidden or shown.
OnSize Called after the size of CWnd has changed.
OnSizing Indicates that the user is resizing the rectangle.
OnStyleChanged Indicates that one or more of the window's styles has changed.
OnStyleChanging Indicates that one or more of the window's styles is about to change.

Control Message Handlers

OnCharToItem Called by a child list box with the LBS_WANTKEYBOARDINPUT style in response to a WM_CHAR message.
OnCompareItem Called to determine the relative position of a new item in a child sorted owner-draw combo box or list box.
OnDeleteItem Called when an owner-draw child list box or combo box is destroyed or when items are removed from the control.
OnDrawItem Called when a visual aspect of an owner-draw child button control, combo-box control, list-box control, or menu needs to be drawn.
OnDSCNotify Called in response to an event that a data-source control fires when a control to which the data-source control is bound modifies or attempts to modify the underlying cursor.
OnGetDlgCode Called for a control so the control can process arrow-key and TAB-key input itself.
OnMeasureItem Called for an owner-draw child combo box, list box, or menu item when the control is created. CWnd informs Windows of the dimensions of the control.
SendChildNotifyLastMsg Provides a notification message to a child window, from the parent window, so the child window can handle a task.
ReflectChildNotify Helper function which reflects a message to its source.
OnWndMsg Indicates if a windows message was handled.
ReflectLastMsg Reflects the last message to the child window.
OnVKeyToItem Called by a list box owned by CWnd in response to a WM_KEYDOWN message.

Input Message Handlers

OnChar Called when a keystroke translates to a nonsystem character.
OnDeadChar Called when a keystroke translates to a nonsystem dead character (such as accent characters).
OnHScroll Called when the user clicks the horizontal scroll bar of CWnd.
OnKeyDown Called when a nonsystem key is pressed.
OnKeyUp Called when a nonsystem key is released.
OnLButtonDblClk Called when the user double-clicks the left mouse button.
OnLButtonDown Called when the user presses the left mouse button.
OnLButtonUp Called when the user releases the left mouse button.
OnMButtonDblClk Called when the user double-clicks the middle mouse button.
OnMButtonDown Called when the user presses the middle mouse button.
OnMButtonUp Called when the user releases the middle mouse button.
OnMouseActivate Called when the cursor is in an inactive window and the user presses a mouse button.
OnMouseMove Called when the mouse cursor moves.
OnMouseWheel Called when a user rotates the mouse wheel. Uses Windows NT 4.0 message handling.
OnRegisteredMouseWheel Called when a user rotates the mouse wheel. Uses Windows 95 and Windows NT 3.51 message-handling.
OnRButtonDblClk Called when the user double-clicks the right mouse button.
OnRButtonDown Called when the user presses the right mouse button.
OnRButtonUp Called when the user releases the right mouse button.
OnSetCursor Called if mouse input is not captured and the mouse causes cursor movement within a window.
OnTimer Called after each interval specified in SetTimer.
OnVScroll Called when the user clicks the window’s vertical scroll bar.
OnCaptureChanged Sends a message to the window that is losing the mouse capture.

Nonclient-Area Message Handlers

OnNcActivate Called when the nonclient area needs to be changed to indicate an active or inactive state.
OnNcCalcSize Called when the size and position of the client area need to be calculated.
OnNcCreate Called prior to OnCreate when the nonclient area is being created.
OnNcDestroy Called when the nonclient area is being destroyed.
OnNcHitTest Called by Windows every time the mouse is moved if CWnd contains the cursor or has captured mouse input with SetCapture.
OnNcLButtonDblClk Called when the user double-clicks the left mouse button while the cursor is within a nonclient area of CWnd.
OnNcLButtonDown Called when the user presses the left mouse button while the cursor is within a nonclient area of CWnd.
OnNcLButtonUp Called when the user releases the left mouse button while the cursor is within a nonclient area of CWnd.
OnNcMButtonDblClk Called when the user double-clicks the middle mouse button while the cursor is within a nonclient area of CWnd.
OnNcMButtonDown Called when the user presses the middle mouse button while the cursor is within a nonclient area of CWnd.
OnNcMButtonUp Called when the user releases the middle mouse button while the cursor is within a nonclient area of CWnd.
OnNcMouseMove Called when the cursor is moved within a nonclient area of CWnd.
OnNcPaint Called when the nonclient area needs painting.
OnNcRButtonDblClk Called when the user double-clicks the right mouse button while the cursor is within a nonclient area of CWnd.
OnNcRButtonDown Called when the user presses the right mouse button while the cursor is within a nonclient area of CWnd.
OnNcRButtonUp Called when the user releases the right mouse button while the cursor is within a nonclient area of CWnd.

MDI Message Handlers

OnMDIActivate Called when an MDI child window is activated or deactivated.

Clipboard Message Handlers

OnAskCbFormatName Called by a Clipboard viewer application when a Clipboard owner will display the Clipboard contents.
OnChangeCbChain Notifies that a specified window is being removed from the chain.
OnDestroyClipboard Called when the Clipboard is emptied through a call to the Windows function.
OnDrawClipboard Called when the contents of the change.
OnHScrollClipboard Called when a Clipboard owner should scroll the Clipboard image, invalidate the appropriate section, and update the scroll-bar values.
OnPaintClipboard Called when the client area of the Clipboard viewer needs repainting.
OnRenderAllFormats Called when the owner application is being destroyed and needs to render all its formats.
OnRenderFormat Called for the Clipboard owner when a particular format with delayed rendering needs to be rendered.
OnSizeClipboard Called when the size of the client area of the Clipboard-viewer window has changed.
OnVScrollClipboard Called when the owner should scroll the Clipboard image, invalidate the appropriate section, and update the scroll-bar values.

Menu Loop Notification

OnEnterMenuLoop Called when a menu modal loop has been entered.
OnExitMenuLoop Called when a menu modal loop has been exited.

CWnd Overview |  Base Class Members |  Hierarchy Chart

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