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Formatted MessageBox/AfxMessageBox

, 20 Oct 2010
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Need to Format/sprintf a string before displaying a messagebox? Here is solution!
You often need to format a string and populate it with relevant data before displaying a message box. For example
int nAge = 27;
TCHAR sName[]="Ajay";
float nSalary = 12500.50;
 
// Declare variable
CString strMessage;
 
// Format
strMessage.Format( _T("Name is %s, Age is %d, and salary is %.2f"), 
    sName, nAge, nSalary);
 
// Then display.
AfxMessageBox(strMessage);</br></br>
What if this can be acheived by single statement:
AfxMessageBoxFormatted(_T("Name is %s, Age is %d, and salary is %.2f"), 
   sName, nAge, nSalary);
And here is implementation of AfxMessageBoxFormatted:
void AfxMessageBoxFormatted(LPCTSTR pFormatString, ...)
{
    va_list vl;
    va_start(vl, pFormatString);
 
    CString strFormat;
    strFormat.FormatV(pFormatString, vl); // This Line is important!

    // Display message box.	
    AfxMessageBox(strFormat);
}</br></br>
If you don't you MFC, or don't want to use, you can implement MessageBoxFormatted as:
void MessageBoxFormatted(HWND hWnd, LPCTSTR pCaption, LPCTSTR pFormatString, ...)
{
    va_list vl;
    va_start(vl, pFormatString);
    
    TCHAR strFormat[1024]; // Must ensure size!

 
    // Generic version of vsprintf, works for both MBCS and Unicode builds 
    _vstprintf(strFormat, pFormatString, vl);
	
    // Or use following for more secure code
    // _vstprintf_s(strFormat, sizeof(strFormat), pFormatString, vl)

    ::MessageBox(hWnd, strFormat, pCaption,MB_ICONINFORMATION);
}</br></br></br></br>
And use it as:
MessageBoxFormatted(NULL,  // Or a valid HWND
    _T("Information"),
    _T("Name is %s, Age is %d, and salary is %.2f"),
    sName, nAge, nSalary);
If you don't understand stuff like TCHAR, LPCTSTR, _T, you better read this Tip/Trick: What are TCHAR, WCHAR, LPSTR, LPWSTR, LPCTSTR etc?[^]

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Ajay Vijayvargiya
Software Developer (Senior)
India India
Started programming with GwBasic back in 1996 (Those lovely days!). Found the hidden talent!
 
Touched COBOL and Quick Basic for a while.
 
Finally learned C and C++ entirely on my own, and fell in love with C++, still in love! Began with Turbo C 2.0/3.0, then to VC6 for 4 years! Finally on VC2008/2010.
 
I enjoy programming, mostly the system programming, but the UI is always on top of MFC! Quite experienced on other environments and platforms, but I prefer Visual C++. Zeal to learn, and to share!

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