Microsoft KB Archive/131991

= How to change the mouse pointer for a window in MFC by using Visual C++ =

Article ID: 131991

Article Last Modified on 11/21/2006

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APPLIES TO

 Microsoft Foundation Class Library 4.2, when used with:  Microsoft Visual C++ 1.5 Professional Edition

 Microsoft Visual C++ 1.51

 Microsoft Visual C++ 1.52 Professional Edition

 Microsoft Visual C++ 1.0 Professional Edition</li></ul>

 Microsoft Visual C++ 2.0 Professional Edition</li></ul>

 Microsoft Visual C++ 2.1</li></ul>

 Microsoft Visual C++ 4.0 Standard Edition</li></ul>

 Microsoft Visual C++ 5.0 Enterprise Edition</li></ul>

 Microsoft Visual C++ 6.0 Enterprise Edition</li></ul>

 Microsoft Visual C++ 5.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Professional Edition</li></ul>

 Microsoft Visual C++ 6.0 Standard Edition</li></ul>

<ul> <li>Microsoft Visual C++ .NET 2002 Standard Edition</li></ul>

<ul> <li>Microsoft Visual C++ .NET 2003 Standard Edition</li></ul>

<ul> <li>Microsoft Visual C++ 2005 Express Edition</li></ul> </li></ul>

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This article was previously published under Q131991

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Note Microsoft Visual C++ .NET (2002) supports both the managed code model that is provided by the Microsoft .NET Framework and the unmanaged native Microsoft Windows code model. The information in this article applies only to unmanaged Visual C++ code.

Note Microsoft Visual C++ 2005 supports both the managed code model that is provided by the .NET Framework and the unmanaged native Windows code model.

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SUMMARY
In a Windows-based application, a window is always created based on a window class. The window class identifies several characteristics of the windows based on it, including the default mouse pointer (cursor). In some cases, an application may want to change the pointer associated with certain windows that it creates. This article describes three methods an MFC application can use to display different pointers at different times.

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MORE INFORMATION
Here are some situations when you might want an MFC application to display different pointers at different times:
 * When the default pointer isn't a good user-interface object for a particular application. For example, an I-beam pointer is more suitable than the arrow for a text editor window in NotePad. This could involve changing the pointer for the entire run of the application.
 * When an application performs a lengthy operation, such as disk I/O, an hourglass pointer is more appropriate than the arrow. By changing the pointer to an hourglass, you provide good visual feedback to the user. This could involve changing the pointer for a limited period of time.

Three methods
Here are three ways an application can change the mouse pointer in a window:
 * Override the CWnd::OnSetCursor function. Call Windows API SetCursor function to change the pointer.
 * Register your own window class with the desired mouse pointer, override the CWnd::PreCreateWindow function, and use the newly-registered window class to create the window.
 * To show the standard hourglass pointer, an application can call the CCmdTarget::BeginWaitCursor, which displays the hourglass, and call CmdTarget::EndWaitCursor to revert back to the default pointer. This scheme works only for the duration of a single message. If the mouse is moved before a call to EndWaitCursor is made, Windows sends a WM_SETCURSOR message to the window underneath the pointer. The default handling of this message resets the pointer to the default type, the one registered with the class, so you need to override CWnd::OnSetCursor for that window, and reset the pointer back to the hourglass.

Code to illustrate the three methods
The following code shows by example how to change the mouse pointer of a CView derived class window by using the three methods. m_ChangeCursor is a member variable of CMyView class and is of type BOOL. It indicates whether a different pointer type needs to be displayed.

Method one
Change the mouse pointer for the CMyView object by overriding CWnd::OnSetCursor function. Use ClassWizard to establish the message map function CMyView::OnSetCursor for Windows message WM_SETCURSOR and supply the body of the function as follows: BOOL CMyView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) {           if ( m_ChangeCursor ) {                 ::SetCursor(AfxGetApp->LoadStandardCursor(IDC_WAIT)); return TRUE; }

return CView::OnSetCursor(pWnd, nHitTest, message); }

Method two
Register your own window class containing the desired mouse pointer by using either the AfxRegisterClass or AfxRegisterWndClass function. Then create the view window based on the registered window class. For more information on registering window classes in MFC, please see MFC Tech Note 1, "Window Class Registration." BOOL CMyView::PreCreateWindow(CREATESTRUCT& cs) {         cs.lpszClass = AfxRegisterWndClass(            CS_DBLCLKS | CS_HREDRAW | CS_VREDRAW, // use any window styles            AfxGetApp->LoadStandardCursor(IDC_WAIT),            (HBRUSH) (COLOR_WINDOW + 1));         // background brush

return CView::PreCreateWindow(cs) }

Method three
Call the BeginWaitCursor and EndWaitCursor functions to change the mouse pointer.

NoteCWinApp::DoWaitCursor(1) and CWinApp::DoWaitCursor(-1) work similarly to BeginWaitCursor and EndWaitCursor, respectively. void CMyView::PerformLengthyOperation {           BeginWaitCursor;  // or AfxGetApp->DoWaitCursor(1)

//...

EndWaitCursor;   // or AfxGetApp->DoWaitCursor(-1) } Note If calls to BeginWaitCursor and EndWaitCursor are not in the same handler, you must override OnSetCursor as follows: BOOL CMyView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) {           if (m_ChangeCursor) {                 RestoreWaitCursor; return TRUE; }

return CView::OnSetCursor(pWnd, nHitTest, message); } In this example, set m_ChangeCursor to TRUE just before the call to BeginWaitCursor, and set it back to FALSE after the call to EndWaitCursor.

Keywords: kbcursor kbhowto kbuidesign kbwndw KB131991

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