QTableWidget每个列头的指针怎么找到

QTableWidget每个列头的指针如何找到？
QHeaderView
Supports the box model. The sections of the header view are styled using the ::section sub control. The section Sub-control supports the :middle, :first, :last, :only-one, :next-selected, :previous-selected, :selected, and :checked pseudo states.
Sort indicator in can be styled using the ::up-arrow and the ::down-arrow Sub-control.
See Customizing QHeaderView for an example.

C/C++ code

m_pMyTable = new QTableWidget(3, 3, this);
QHeaderView* headerView = m_m_pMyTable->horizontalHeader();
headerView->setObjectName ("MyTableHeaderName");

:middle, :first, :last，这几个参数如何用它？

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呵呵 恭喜蛤~
QT的帮助文档，有时间多浏览一下，还是很多问题能解决的。