MFC CListCtrl中的setitemtext和LVN_ITEMCHANGED问题 [英] setitemtext and LVN_ITEMCHANGED problem in MFC CListCtrl

问题描述

大家好，

我在窗体视图上有一个列表控件.由于各种原因，我正在表单视图中处理LVN_ITEMCHANGED消息.在特定情况下，我想更改第二行第0列的文本，因此我使用了setItemText()来做到这一点.这一次，我再次收到LVN_ITEMCHANGED消息，引起了一个大问题(递归调用).
如何停止第二条消息?

Hello all,

I have a list control on a form view. I am handling LVN_ITEMCHANGED message in form view for various reasons. In a particular case, I want to change the text of a 2nd row, 0th column, so I used setItemText() to do that. At this time, again I am receiving LVN_ITEMCHANGED message, causing a big problem(recursive call).
How can I stop this second message?

推荐答案

您可以尝试根据 ^ ]

You could try checking the uChanged parameter of the message as per http://msdn.microsoft.com/en-us/library/bb774845(v=vs.85).aspx[^]

void CMyClass::OnItemChanged(NMHDR *pNMHDR, LRESULT *pResult) {
	*pResult = 1; //or =0 if you want the message to continue to be processed
	pNMLV = (LPNMLISTVIEW)pNMHDR;
	if (!(pNMLV->uChanged & LVIF_TEXT)) {
		//SetItemText();
	}
}

我不确定这是否行得通，您可能需要尝试一下并检查pNMLV的值，以查看第一次调用和递归调用之间的变化.

Im not sure if that will work, you may need to experiment with it a little and check the values of pNMLV to see what is changing between the first call and the recursive call.

实现目标的一种方法是在调用setItemText()之前先设置boolean成员("internalListChange"或类似名称)，然后再对其进行重置.然后在您的消息处理程序中，从头开始，测试internalListChange = true并返回是否为它.

One way to achieve your aims is to have a boolean member (''internalListChange'' or similar) set it before your call to setItemText() and reset it after. Then in your message handler, right at the beginning, test for internalListChange = true and return if it is.

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