bool JumpToLine(HWND hwnd, int nLineNo)
{
    // 指定行にジャンプ
    long nCharIndex = SendMessage(hwnd, EM_LINEINDEX, nLineNo - 1, 0);
    TRACE("nCharIndex = %d\n", nCharIndex);
    PostMessage(hwnd, EM_SETSEL, nCharIndex, nCharIndex);
    PostMessage(hwnd, EM_SCROLLCARET, 0, 0);

    return true;
}