启用 ctreecntrl 树项中的复选框
我正在尝试在 Visual C++ 6.0 的 ctreecntrl 中启用/禁用树项中的复选框。我找到了对所有项目执行此操作的选项，但无法对每个项目执行此操作。有什么功能可以做到这一点吗？
I am trying to enable/disable checkboxes in treeitems in ctreecntrl of visual c++ 6.0. I have found the options to do that for all items, but couldn't do that per item basis. Is there any function to do that?
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要打开和关闭单个树项目的复选框，您需要发送
TVM_SETITEM消息，用于设置 TreeView 中项目的属性。文档说
wParam必须为零，而lParam是指向TVITEM结构 包含新的项目属性。因此，真正的战斗是相应地填写
TVITEM结构。以下是重要部分：hItem成员必须包含要修改的树项的句柄。mask成员应设置为TVIF_STATE，这表明state和stateMask成员有效。您将使用这些来打开和关闭复选框。state成员可以设置为 0，这将隐藏指定树项的复选框。要显示树项目的复选框，请设置
1 <<< 12.. （有关详细信息，请参阅文档）。stateMask成员应设置为TVIS_STATEIMAGEMASK以指示您正在更改项目的状态图像索引。由于您已设置
mask来指示您仅使用state和stateMask成员，因此您可以愉快地忽略其余成员。最后，一旦设置了
TVITEM结构，您就可以使用标准SendMessage函数，或TreeView_SetItem宏，将消息发送到树项。（当然，整个TreeView必须有
TVS_CHECKBOXESstyle 设置以使上述任何一项都可以工作！但你说你已经知道如何做到这一点。）To turn checkboxes on and off for individual tree items, you need to send
TVM_SETITEMmessages, which are used to set attributes for items in a TreeView.The documentation says the
wParammust be zero, and thelParamis a pointer to aTVITEMstructure that contains the new item attributes.So the real battle is in getting the
TVITEMstructure filled out accordingly. Here are the important parts:hItemmember must contain the handle to the tree item that you want to modify.maskmember should be set toTVIF_STATE, which indicates that thestateandstateMaskmembers are valid. Those are the ones you'll be using to turn checkboxes on and off.statemember can be set to 0, which will hide the checkbox for the specified tree item.To show the checkbox for the tree item, set this member of
1 << 12. (See the docs for details).stateMaskmember should be set toTVIS_STATEIMAGEMASKto indicate that you're changing the item's state image index.Since you've set
maskto indicate that you're only using thestateandstateMaskmembers, you can happily ignore the rest of the members.And finally, once you've got the
TVITEMstructure set, you can either use the standardSendMessagefunction, or theTreeView_SetItemmacro, to send the message to the tree item.(Of course, the entire TreeView must have the
TVS_CHECKBOXESstyle set in order for any of the above to work! But you said you already figured out how to do that.)