Change text in writer without changing style and formats

[K.Misha]

One more question... before changing text i have this:



 

 

Reference < XTextDocument > xTextDocument (xWriterComponent,UNO_QUERY);

    Reference< XText > xText = xTextDocument->getText();

 

      rtl::OUString uText = xText->getString();

      rtl::OString str = rtl::OUStringToOString( uText,
RTL_TEXTENCODING_MS_1251 );

      char * str1 = (char *) str.getStr();

 

      Reference < XTextDocument > xTextDocument
(xWriterComponent,UNO_QUERY);

      Reference< XText > xText = xTextDocument->getText();

 

      int nLenOfWideCharStr =

            MultiByteToWideChar(

            CP_ACP,

            MB_PRECOMPOSED,

            str1,

            -1,

            NULL,

            0

        );

 

    const wchar_t * wVal = (PWSTR)HeapAlloc(GetProcessHeap(), 0,
nLenOfWideCharStr * sizeof(WCHAR));

 

    MultiByteToWideChar(

        CP_ACP,

        MB_PRECOMPOSED,

        str1,

        -1,

            (wchar_t *)wVal,

        nLenOfWideCharStr

    );      

      Reference<XTextCursor> xTextCursor = xText->createTextCursor();

      xTextCursor->goRight(iStartAt, 0);

      xTextCursor->setString(wVal);

 

after this code all tables and other styles were deleted. How can i change
text without deleting it?