Re: Problem dynamically creating CStatic Label: (FAIL afxwin1.inl line

From:
David Wilkinson <no-reply@effisols.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Fri, 12 Sep 2008 08:50:37 -0400
Message-ID:
<u2IGnYNFJHA.4784@TK2MSFTNGP05.phx.gbl>
Samu wrote:

With a standard label, I cannot find any simple way to change the color.
Amazing!

Options seem to be (1) make CMyLabel from scratch, or (2) subclass CStatic

I've downloaded some code that does it:
http://www.codeguru.com/cpp/controls/staticctrl/article.php/c2909/

I've created my own Test container MFC app, and lifted the core code out of
the sample.

My code (1) dynamically creates a CStatic, then (2)feeds it to the lifted
code which will subclass it.

But (1) is failing here:
        pLabel->Create(
                  NULL,
                  WS_CHILD|WS_VISIBLE|SS_LEFT,
                  CRect(20,20,150,150),
                  pCWndParent
                  );

Here's the context:

    CWnd* pCWndParent;
    CStatic* pLabel;

    bool ret;

    switch( message )
    {
    case WM_CREATE:
        pCWndParent = CWnd::FromHandle(hwnd);
        pCWndParent->AssertValid();
        // Location X
        pLabel = new CStatic();
        pLabel->Create(
                  NULL,
                  WS_CHILD|WS_VISIBLE|SS_LEFT,
                  CRect(20,20,150,150),
                  pCWndParent
                  ); // FAILS

Last line fails with 'Debug Assert Failed afxwin1.inl, line 21'

Stepping into the code as far as I can:
line 696 of wincore.cpp triggers it: cs.hInstance = AfxGetInstanceHandle();

Heres the whole function:

BOOL CWnd::CreateEx(DWORD dwExStyle, LPCTSTR lpszClassName,
    LPCTSTR lpszWindowName, DWORD dwStyle,
    int x, int y, int nWidth, int nHeight,
    HWND hWndParent, HMENU nIDorHMenu, LPVOID lpParam)
{
    ASSERT(lpszClassName == NULL || AfxIsValidString(lpszClassName) ||
        AfxIsValidAtom(lpszClassName));
    ENSURE_ARG(lpszWindowName == NULL || AfxIsValidString(lpszWindowName));

    // allow modification of several common create parameters
    CREATESTRUCT cs;
    cs.dwExStyle = dwExStyle;
    cs.lpszClass = lpszClassName;
    cs.lpszName = lpszWindowName;
    cs.style = dwStyle;
    cs.x = x;
    cs.y = y;
    cs.cx = nWidth;
    cs.cy = nHeight;
    cs.hwndParent = hWndParent;
    cs.hMenu = nIDorHMenu;
    cs.hInstance = AfxGetInstanceHandle(); // <-- FAILS
:
:

I can't step into this line. 'Source not available'
Before, I could. Then I inserted some whitespace into a file to make it
clearer to follow the debug trace. This mashed the project(?!) - I got build
errors. Had to create a new project and move the files in. Now I can't step
into the code.
The 'Assert Failed ...' error message cites the offending file as
F:/blah/afxwin1.inl. But F: doesn't exist: I relabelled my external HDD
(with visual Studio on) to X: I don't know why it's looking in F:

Anyway, here's a StackDump at this point

     lbl2.exe!CWnd::CreateEx(unsigned long dwExStyle=0, const char * lpszClassName=0x00b31f94, const char * lpszWindowName=0x00000000, unsigned long dwStyle=1342177280, int x , int y , int nWidth=130, int nHeight=130, HWND__ * hWndParent=0x00070f5a, HMENU__ * nIDorHMenu=0x0000ffff, void * lpParam=0x00000000) Line 696 C++
  lbl2.exe!CWnd::Create(const char * lpszClassName=0x00b31f94, const char *
lpszWindowName=0x00000000, unsigned long dwStyle=1342177280, const tagRECT &
rect={...}, CWnd * pParentWnd=0x002b4844, unsigned int nID=65535,
CCreateContext * pContext=0x00000000) Line 757 C++
  lbl2.exe!CStatic::Create(const char * lpszText=0x00000000, unsigned long
dwStyle=1342177280, const tagRECT & rect={...}, CWnd * pParentWnd=0x002b4844,
unsigned int nID=65535) Line 28 C++
  lbl2.exe!WndProc(HWND__ * hwnd=0x00070f5a, unsigned int message=1,
unsigned int wparam=0, long lparam=2685088) Line 120 + 0x3c bytes C++
  user32.dll!7597f8d2()
  [Frames below may be incorrect and/or missing, no symbols loaded for
user32.dll]
  user32.dll!75971912()
  user32.dll!7597f73d()
  user32.dll!75980817()
  user32.dll!759739f7()
  ntdll.dll!771399ce()
  user32.dll!75973cf7()
  user32.dll!75973b94()
  user32.dll!7596fc9e()
  lbl2.exe!WinMain(HINSTANCE__ * hInstance=0x00920000, HINSTANCE__ *
hPrevInstance=0x00000000, char * szCmdLine=0x00312c53, int iCmdShow=1) Line
61 + 0x31 bytes C++
  lbl2.exe!__tmainCRTStartup() Line 263 + 0x2c bytes C
  lbl2.exe!WinMainCRTStartup() Line 182 C
  kernel32.dll!76c34911()
  ntdll.dll!7711e4b6()
  ntdll.dll!7711e489()

I tried putting
    AfxSetResourceHandle(hInst);
at location X in my code above, but it doesnt help :(

I tried googling. No luck.

Please can somebody help? I'm so frustrated, but also curious to know
what's going on.


Sam:

Not quite sure what your problem is here, but I suggest you start over.

You do not need to create a control dynamically in order to get a colored text
box. Just put an ordinary static text box on the dialog template, change its ID
to something other than the default IDC_STATIC, and then either

(a) Handle the WM_CTLCOLORSTATIC message in the dialog.

or

(b) Use the CColorStaticST class you found on CodeGuru. To do this, add the
class to your project and then add a control variable of type CColorStaticST to
the static control on the template (if you find that you can only add a control
variable of type CStatic, then do that, and then change the type by hand in the
header file of your dialog. This technique of changing a dialog control to a
customized one is fundamental to MFC, and you will use it often.

--
David Wilkinson
Visual C++ MVP

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