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<TITLE>Statusbar - "Ready" prompt replacement</TITLE>
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<FONT COLOR="#AOAO99">"Ready" prompt replacement</FONT></H3></CENTER>
<HR>
This sample was contributed by <A HREF="mailto:mfindlay@seanet.com">Mark Findlay</A>.
<H4>Replacing the "Ready" message at run time with custom text.</H4>
<P>The following will allow you to specify a replacement string to appear
in the status bar any time the customary "Ready" string would normally
appear.
<P>The difference between this and simply using the AFX_IDS_IDLEMESSAGE
is that this technique allows you to set the text to appear in place
of the "Ready" prompt AT RUN TIME.
<P>With this, you could for example, read a database, then display the
number of records read of a total record count, or display the time
it took to read the table, or the table name, etc.
<P>With this technique you can change the text as much as you like,
any time you like during the course of program execution.
<P>Thanks to Steve McAdams for his help in pointing me to the right
place to get things working.
<P>The function that handles this is copied almost verbatim from
the WINFRM.CPP CFrameWnd::OnSetMessageString. The only change
is to display our own message string.
<P>Our changes will take place in the CMainFrame class.
<H4>Step1:</H4>
Create a CString variable that will contain the text to display
<PRE><TT><FONT COLOR="#990000">
CString m_sStatusBarString;
</FONT></TT></PRE>
<H4>Step2:</H4>
Add the prototype in the CMainFrame.h file for the OnSetMessageString()
function
<PRE><TT><FONT COLOR="#990000">
//{{AFX_MSG(CMainFrame)
afx_msg LRESULT OnSetMessageString(WPARAM wParam, LPARAM lParam);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
</FONT></TT></PRE>
<H4>Step3:</H4>
Add the OnSetMessageString() handler to the CMainFrame.cpp file
<PRE><TT><FONT COLOR="#990000">
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
//{{AFX_MSG_MAP(CMainFrame)
ON_MESSAGE(WM_SETMESSAGESTRING, OnSetMessageString)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
</FONT></TT></PRE>
<H4>Step4:</H4>
Create the OnSetMessageString() function:
<PRE><TT><FONT COLOR="#990000">
//***************************************************************
LRESULT CMainFrame::OnSetMessageString(WPARAM wParam, LPARAM lParam)
{
UINT nIDLast = m_nIDLastMessage;
m_nFlags &= ~WF_NOPOPMSG;
CWnd* pMessageBar = GetMessageBar();
if (pMessageBar != NULL)
{
LPCTSTR lpsz = NULL;
CString strMessage;
// set the message bar text
if (lParam != 0)
{
ASSERT(wParam == 0);
m_sStatusBarString = (LPCTSTR)lParam; // Here is our string
lpsz = m_sStatusBarString;
}
else if (wParam != 0)
{
// map SC_CLOSE to PREVIEW_CLOSE when in print preview mode
if (wParam == AFX_IDS_SCCLOSE && m_lpfnCloseProc != NULL)
wParam = AFX_IDS_PREVIEW_CLOSE;
// If the "Ready" string is attempted to be read,
// use our string instead
if (wParam == AFX_IDS_IDLEMESSAGE)
lpsz = m_sStatusBarString;
else
{ // default for menu items etc.
GetMessageString(wParam, strMessage);
lpsz = strMessage;
}
}
// Set text of status bar
pMessageBar->SetWindowText(lpsz);
// update owner of the bar in terms of last message selected
CFrameWnd* pFrameWnd = pMessageBar->GetParentFrame();
if (pFrameWnd != NULL)
{
m_nIDLastMessage = (UINT)wParam;
m_nIDTracking = (UINT)wParam;
}
}
m_nIDLastMessage = (UINT)wParam; // new ID (or 0)
m_nIDTracking = (UINT)wParam; // so F1 on toolbar buttons work
return nIDLast;
}
</FONT></TT></PRE>
<H4>Step5:</H4>
WM_SETMESSAGESTRING is defined in afxpriv.h. Because we want to be able to use this
message in any file, add the include to the Stdafx.h file
<PRE><TT><FONT COLOR="#990000">
#include <afxpriv.h> // defines WM_SETMESSAGESTRING
</FONT></TT></PRE>
<P>That's all there is to it. To set the status bar text use the following
to invoke the OnSetMessageString() function:
<PRE><TT><FONT COLOR="#990000">
CString sReplacementText = "This text will always appear in place of Ready";
((CMainFrame*)AfxGetMainWnd())->SendMessage(WM_SETMESSAGESTRING,
(WPARAM)0, (LPARAM)sReplacementText.GetBuffer(0));
</FONT></TT></PRE>
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<p>Last updated: 17 May 1998
<P><HR>
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<CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER>
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