_T Macro Question

This is a discussion on _T Macro Question within the Windows Programming forums, part of the Platform Specific Boards category; I am new to MFC programming. How do you display variables using a _T macro Code: void CMainWindow::OnLButtonDown(UINT nFlags, CPoint ...

  1. #1
    Registered User mrafcho001's Avatar
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    _T Macro Question

    I am new to MFC programming.

    How do you display variables using a _T macro

    Code:
    void CMainWindow::OnLButtonDown(UINT nFlags, CPoint point)
    {
    	MessageBox(_T("You Have Left Clicked %d, %d", point.x, point.y), _T("LEFT CLICK"));
    
    }
    as you see i am trying to display where the user has clicked with the mouse

    But im not sure how to display the point.x and point.y falues

  2. #2
    Even death may die... Dante Shamest's Avatar
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    wsprintf the formatted text into a TCHAR buffer first. Then pass the buffer to MessageBox.

  3. #3
    Registered User mrafcho001's Avatar
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    Im not getting what you are saying... sorry
    could you show me?

    EDIT:

    NVM i got it, Thanks Dente!
    Last edited by mrafcho001; 06-10-2005 at 12:34 PM.

  4. #4
    Rog
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    When I am doing MFC programming (as opposed to API programming) I always use CString. It is an efficent class in terms of memory management, and all the string manipulation and conversion functions are already written (so you don't need to reinvent the wheel).

    For example:

    Code:
    // . . .
    CString str;
    str.Format("You clicked at point %d, %d", pt.x, pt.y);
    MessageBox(str);
    // . . .
    -Rog

  5. #5
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    you dont want to use wsprintf, because what if _UNICODE isn't defined? The correct way would be to use a tchar.h routine like _stprintf().

  6. #6
    Yes, my avatar is stolen anonytmouse's Avatar
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    Quote Originally Posted by bithub
    you dont want to use wsprintf, because what if _UNICODE isn't defined? The correct way would be to use a tchar.h routine like _stprintf().
    Are you confusing wsprintf (Windows sprintf) with swprintf? Anyway _stprintf is often a better choice as wsprintf provides only a subset of the functionality of _stprintf. For example, it does not support floating point values and has a short maximum buffer length. wsprintf depends on whether UNICODE is defined while _stprintf depends on whether _UNICODE is defined. You should always have both of these symbols defined, or neither.

  7. #7
    Registered User mrafcho001's Avatar
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    Quote Originally Posted by anonytmouse
    Are you confusing wsprintf (Windows sprintf) with swprintf? Anyway _stprintf is often a better choice as wsprintf provides only a subset of the functionality of _stprintf. For example, it does not support floating point values and has a short maximum buffer length. wsprintf depends on whether UNICODE is defined while _stprintf depends on whether _UNICODE is defined. You should always have both of these symbols defined, or neither.

    What do i define them as?

  8. #8
    erstwhile
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    For simple stuff, eg:
    Code:
    #define UNICODE
    #define _UNICODE
    #include <windows.h>
    #include <tchar.h>
    It's better to define such macros for your whole project, though; check your compiler documentation for how to do this.
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

  9. #9
    Registered User mrafcho001's Avatar
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    Im an MFC programmer (Well N00b programmer).

    Does TCHAR.h get included from afxwin.h?

  10. #10
    erstwhile
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    >>Does TCHAR.h get included from afxwin.h?<<

    No - check the header yourself.

    I don't do much mfc but I assume that if you define the unicode macros for your project, that should be good enough. Hopefully someone with considerably more than my next-to-none mfc experience will clarify this for you shortly.

    tchar.h (again, open it up and take a look) defines a bunch of unicode/non-unicode mappings for mainly string functions and the _T and TEXT macros (these latter two are also defined elsewhere, maybe winnt.h) so you should only include it if you need to. If you're using wsprintf, you won't need tchar.h because wsprintf is an api and should be available for you to use without any extra header includes.

    Actually, if you're using mfc just use the mfc cstring class (rog mentioned this already).

    msdn: Unicode Programming Summary.
    msdn: international programming (unicode, tchar.h etc).
    CProgramming FAQ
    Caution: this person may be a carrier of the misinformation virus.

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