bool QWinInputContext::reconvertByQt() 
{
    // Reconversion performed by Qt.
    // Call this for Korean IME when wParam is VK_HANJA under WM_IME_KEYDOWN.

    QWidget *w = focusWidget();
    if(!w)
        return false;

    if (!(ImmGetProperty(GetKeyboardLayout(0), IGP_SETCOMPSTR) & SCS_CAP_SETRECONVERTSTRING))
        return false;

    unsigned int rcSizeWithout = reconvertString((LPARAM)NULL);
    if (rcSizeWithout <= sizeof(RECONVERTSTRING))
        return false;

    std::vector<char> rcStructure(rcSizeWithout, '\0');
    PRECONVERTSTRING reconvert = (PRECONVERTSTRING) &rcStructure[0];

    reconvert->dwSize = rcSizeWithout;
    unsigned int rcSizeWith = reconvertString(reconvert);

    HIMC imc = getContext(w->effectiveWinId());
    if (!imc)
        return false;

    if (!::ImmSetCompositionStringW(imc, SCS_SETRECONVERTSTRING, reconvert, rcSizeWith, NULL, 0)) {
        ::ImmReleaseContext(w->effectiveWinId(), imc);
        return false;
    }

    ::ImmReleaseContext(w->effectiveWinId(), imc);
    return true;
}