BUG: Text from a Rich Edit Control Is Truncated During Dialog Data Exchange (DDX) (280447)

MORE INFORMATION

To work around this problem, add the following two functions to your project:

    DWORD CALLBACK ES2MemCallBack(DWORD_PTR dwCookie,
                                  LPBYTE pbBuff, LONG cb, LONG *pcb)
    {
        LPTSTR& lpszStrFill = *(LPTSTR*)dwCookie;
        memcpy(lpszStrFill, pbBuff, *pcb = cb);
        lpszStrFill += cb;
        *lpszStrFill = TCHAR('\0');

        return 0;
    }


    void AFXAPI DDX_RichText(CDataExchange* pDX, int nIDC, CString& value)
    {
        extern void AFXAPI AfxSetWindowText(HWND hWndCtrl, LPCTSTR lpszNew);
        HWND hWndCtrl = pDX->PrepareEditCtrl(nIDC);
        if (pDX->m_bSaveAndValidate)
        {
            int nLen = ::GetWindowTextLength(hWndCtrl);

            LPTSTR lpszStrFill = value.GetBufferSetLength(nLen);
            EDITSTREAM es = { (DWORD_PTR) &lpszStrFill, 0, ES2MemCallBack };
            ::SendMessage(hWndCtrl, EM_STREAMOUT, SF_TEXT, (LPARAM) &es);
            value.ReleaseBuffer();
        }
        else
        {
            AfxSetWindowText(hWndCtrl, value);
        }
    }

				

To add Class Wizard support for the new data exchange function, add the following lines to the .clw file or to the Ddx.clw file of your project:

See the "References" section of this article for more information about DDX and DDV Routines.

    ExtraDDXCount=1
    ExtraDDX1=7;;TextOver64KB;CString;;RichText;Retrieves text in excess of 64KB from RichEdit controls
				

Alternatively, if the ExtraDDXCount line already exists, you can increment the value of ExtraDDXCount by one.

NOTE: Seven is the numeric constant that indicates a rich edit control.

If you do not use the preceding step, you must manually replace all calls to DDX_Text with DDX_RichText. Then, you must move these calls outside the wizard-controlled code. Wizard-controlled code is the code that is bracketed by //{{AFX_DATA_INIT(...) and //}}AFX_DATA_INIT, and //{{AFX_DATA_MAP(...) //}}AFX_DATA_MAP.

For more information about DDX and dialog data validation (DDV) routines, see the "References" section.