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CRichEditCtrl and CHARFORMAT2

teff
teff asked
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Last Modified: 2013-11-19
Dear Experts,

in my application I'm using a CRichEditCtrl on a PropertyPage to design context specific help texts. For this, I have to set double underline and hidden style to selected text portions. The usual CHARFORMAT doesn't support this.

In \MSDEV\INCLUDE\RICHEDIT.H there is a CHARFORMAT2 which has such flags and I derived a new Class from CRichEditCtrl to overwrite SetSelectionCharFormat() to have a correct dwSize set before posting the message.

BOOL CMyRichEditCtrl::SetSelectionCharFormat(CHARFORMAT2 &cf)
{
      ASSERT(::IsWindow(m_hWnd));
      cf.cbSize = sizeof(CHARFORMAT2);
      return (BOOL)::SendMessage(m_hWnd, EM_SETCHARFORMAT, SCF_SELECTION, (LPARAM)&cf);
}

But this has no effect. Neither the new styles are visible (which is ok coz it's mensioned in RICHEDIT.H) nor the styles are stored when streaming out with SF_RTF.

Does anyone have an idea? Answers are highly appreciated. Thanx in advance.

Environment: WIN NT 4.0, MSVC 4.2

Best regards,
Teff
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Tommy HuiEngineer

Commented:
If you take a look at CRichEditCtrl's source code in WinCtrl4.cpp, you'll see that the class has been hardcoded to use version 1.0 of the richedit control. You can derive your own class from CRichEditCtrl to override the create to use the version 2.0 of RICHEDIT.

Note that you should use the class name of RICHEDIT_CLASS instead of a string constant.


Author

Commented:
Hello thui,

thanx for your answer. I derived my class as you proposed and overrode the create as follows:

BOOL CHelpEditCtrl::Create(DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID)
{
      m_hInstRichEdit = LoadLibraryA("RICHED32.DLL");
      if (m_hInstRichEdit == NULL)
            return FALSE;

      CWnd* pWnd = this;
      return pWnd->Create(RICHEDIT_CLASS, NULL, dwStyle, rect, pParentWnd, nID);
}

But with this, the WIN-API ::CreateEx returns NULL and the GetLastError() returns 0x057F.

What have I done wrong? Do I need the complete _AFX_RICHEDIT_STATE stuff from WinCtrl4.cpp?

I'm looking forward to your answer.

Yours,
Teff
Engineer
Commented:
If you look in Winerror.h, GetLastError() returning 057F means it cannot find the wndclass. That means that the RichEdit control does not exist on your system. Or it means you did not initialize the rich edit control correctly. You should probably load riched20.dll I would assume.

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Author

Commented:
Hello thui,

thanx again. I will now close this question, but I'm not absolutely happy with it.
As you see in my code example I load RICHED20.DLL, in a wrong way I assume. But I'm not experienced enough to do this AFX_ stuff as in WINCTRL4.CPP. So if you have a final proposal (or example) please let me know.

Bye, Teff
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