Dev C++ linker error: undefined reference

This is a discussion on Dev C++ linker error: undefined reference within the Windows Programming forums, part of the Platform Specific Boards category; This is the first time Ive done any programming since a few classes 6 years ago, so the answer is ...

  1. #1
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    Unhappy Dev C++ linker error: undefined reference

    This is the first time Ive done any programming since a few classes 6 years ago, so the answer is likely to be pretty basic.

    I am compliling a Text editor in Dev C++ and getting the following error:

    [Linker error] undefined reference to `SetLayeredWindowAttributes@16'

    I have found that SetLayeredAttributes resides in user32.lib and the windows.h header file.

    I believe SetLayeredWindowAttributes@16 is comming from user32.def file. This is the only file on my computer that include the whole string. (It shows up a number of times minus the @16)

    The linker has the following switches:

    -lkernel32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -loleaut32 -luuid -lodbc32 -lodbccp32 -lcomctl32 -lShlwapi -lopengl32 -lglu32 -luser32
    ../../lib/libuser32.a (<-- I added this one hopping to force recognition)

    No where in my code do I directly access this method, not certain which one of the includes is calling it.

    I dont have a clue what to try from here. Any help would be greatly appreciated.

    -Josh D.

  2. #2
    and the hat of int overfl Salem's Avatar
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    Perhaps because its called something else?

    From MSDN
    BOOL SetLayeredWindowAttributes(
    HWND hwnd,
    COLORREF crKey,
    BYTE bAlpha,
    DWORD dwFlags
    );
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  3. #3
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    I don't know exactly these things (Dev-Cpp, etc.) get put together, but here's what I found:

    With my Cygwin gnu installation (gcc 3.3.1) on my WinXP box I found that the function was there (using nm libuser32.a in the lib\w32api directory. (Found an entry _SetLayeredWindowAttributes@16 under ds00487.o)

    I downloaded and installed Dev-Cpp, navigated to its lib directory, found libuser32.a, but, alas nm libuser32.a did not find the function. Just for kicks I looked in all of the .a files, and did not find an entry for _SetLayeredWindowAttributes or anything similar.

    So, I know this doesn't solve your problem, but maybe someone here can take it farther.

    Dave

  4. #4
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    Salems suggestion still didnt work

    I didnt like the solution, because it will mask any future changes to this system include, but at I needed to try something.

    I copied

    BOOL SetLayeredWindowAttributes(
    HWND hwnd,
    COLORREF crKey,
    BYTE bAlpha,
    DWORD dwFlags
    );

    into one of my header files.

    I no longer get the previous problem. Now I get

    93 C:\Dev-Cpp\Projects\NoteXPad\glLogoControl.cpp
    invalid conversion from `DWORD (*)(void*)' to `DWORD (*)(void*)'

    Huh? Its complaining because of an invalid conversion from type A to type A? What am I missing here?

  5. #5
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    Wink sorry, should include some info

    You probably cant help much without info on the line in question...

    Code:
    glData->hThread = CreateThread(NULL, 0, glLogoDrawThread, glData, 0, &glData->dwThread); // create the rendering thread
    where

    struct gldata_t *glData = (struct gldata_t *)LocalAlloc(LPTR, sizeof(struct gldata_t));

    Thanks for whatever help anyone can render.

  6. #6
    erstwhile
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    undefined reference to `SetLayeredWindowAttributes@16'
    These type of errors are common and have a common solution: check the header where the function is declared and meet any preprocessor condition that is required. In this case, SetLayeredWindowAttributes is declared in winuser.h and requires that you #define _WIN32_WINNT 0x0500 ( or #define _WIN32_WINNT _NT5 for recent winapi versions of mingw) prior to #include <windows.h>.
    invalid conversion from `DWORD (*)(void*)' to `DWORD (*)(void*)'
    Don't have a clue. Here's an example of the use of CreateThread with accompanying ThreadProc, comparison with which may give you some ideas about why your compiler is generating that error.
    CProgramming FAQ
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  7. #7
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    Talking Thanks Ken

    Thanks Ken,
    That was indeed the solution.

    Thanks also for the link to CreateThread information. I dont have a solution yet, but this is my first time working with threads, so thats not surprising.

  8. #8
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    Question

    Hold the phone. This is just getting more and more bizzarre.

    I narrowed the offending parameter to glLogoDrawThread through trial and error. I passed zero for this and it worked, only now the initial problem is back. So the "fix" only postponed the initial error.

    Just to see if I could get something more informative out of the error message for the second issue, I tried changing glLogoDrawThread to both *glLogoDrawThread and &glLogoDrawThread. Neither of these changed the error message at all.
    Does that make any kind of sense?

    I wonder if McDonalds is hiring any fry cooks?

  9. #9
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    One last piece of probably useless information.
    I can explicitly typecast it by:
    (DWORD(*)(void*))glLogoDrawThread

    and I then go on my merry way to the the "SetLayeredWindowAttributes@16" issue again.

  10. #10
    erstwhile
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    Originally posted by josh_d
    and I then go on my merry way to the the "SetLayeredWindowAttributes@16" issue again.
    You're not trying to use the function with win9x are you (min os: win 2000)?
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  11. #11
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    No sir,
    Win2k pro.

  12. #12
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    Thread moved to Windows board

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