我用
QTextCursor cursor = textCursor();
cursor.setPosition(0, QTextCursor::MoveAnchor);
int position = document()->findBlockByNumber (10).position();
cursor.movePosition(QTextCursor::NoMove, QTextCursor::KeepAnchor, position);
cursor.select(QTextCursor::BlockUnderCursor);
cursor.deletePreviousChar();
可是就第一行的内容被清除了,也没删得掉,一点作用都没有
求帮忙