SendMessage函数lParam的空 [英] SendMessage lParam empty

问题描述

我试图存储在LV_ITEM的lParam的值：

I am trying to store a value in the lParam of a LV_ITEM:

;...
mov eax, value
mov lvi.lParam, eax
invoke SendMessage, hList, LVM_INSERTITEM, 0 addr lvi

LVI是（本地）LV_ITEM和hList是我的ListView控件的句柄。如果此项目现在点击，我尽量读它的值：

lvi is a (LOCAL) LV_ITEM, and hList is the handle of my ListView Control. If this item is now clicked, i try to read it's value:

invoke SendMessage,hList,LVM_GETNEXTITEM,-1,LVNI_FOCUSED
mov lvi.iItem, eax
mov lvi.iSubItem, 0
mov lvi.imask, LVIF_TEXT
mov lvi.cchTextMax,256
invoke SendMessage,hList,LVM_GETITEM, 0, addr lvi

同样LVI是（本地）LV_ITEM和hList ListView控件的句柄。
现在我可以阅读例如所述pszText（lvi.pszText），但lParam为始终为零。最后一次错误也返回零。

Again lvi is a (LOCAL) LV_ITEM, and hList the handle of the ListView. Now I can read e.g. the pszText (lvi.pszText), but the lParam is always zero. Last Error also returns zero.

任何帮助是pciated AP $ P $

Any help is appreciated

推荐答案

你的 LV_ITEM 的IMASK设置为 LVIF_TEXT + LVIF_PARAM ？如果没有，在 LV_ITEM 结构lParam的将被忽略。

Did you set the iMask of the LV_ITEM to LVIF_TEXT+LVIF_PARAM? If not, the lParam in the LV_ITEM structure is ignored.

;...
mov lvi.iMask, LVIF_TEXT+LVIF_PARAM
push value
pop lvi.lParam
invoke SendMessage, hList, LVM_INSERTITEM, 0 addr lvi

您还需要请求它以同样的方式：

You will also need to request it in the same way:

invoke SendMessage,hList,LVM_GETNEXTITEM,-1,LVNI_FOCUSED
mov lvi.iItem, eax
mov lvi.iSubItem, 0
mov lvi.imask, LVIF_TEXT+LVIF_PARAM
mov lvi.cchTextMax,256
invoke SendMessage,hList,LVM_GETITEM, 0, addr lvi 

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