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话不多说了,直接上代码:
//此时光标所在的位置
QTextCursor cursor = textEdit->textCursor();
//选中从start到end的这一段文本
int start = cursor.position();
int end = cursor.position()+5;
cursor.setPosition(start,QTextCursor::MoveAnchor);
cursor.setPosition(end,QTextCursor::KeepAnchor);
textEdit->setTextCursor(cursor);