我在使用Selection控件的block对象调用PickPoint(),编译出现了这个错误error C2039: 'PickPoint' : is not a member of 'NXOpen::BlockStyler::UIBlock'

是的，您在使用Selection控件的block对象调用PickPoint时会出现这个错误，因为Selection控件的block对象是UIBlock类型的对象，而UIBlock类型并没有PickPoint函数。

要在BlockStyler中使用PickPoint函数，您可以使用BlockStyler::Utilities::PickPoint方法，该方法可用于选择工作区中的点，并返回所选点的坐标。

下面是一个使用BlockStyler::Utilities::PickPoint的示例代码：

#include "NXOpen/BlockStyler_UIBlock.hxx"
#include "NXOpen/BlockStyler.hxx"
#include "NXOpen/NXMessageBox.hxx"
#include "NXOpen/Part.hxx"
#include "NXOpen/PartCollection.hxx"
#include "NXOpen/Point.hxx"
#include "NXOpen/Point3d.hxx"
#include "NXOpen/Selection.hxx"
#include "NXOpen/SelectionResponse.hxx"
#include "NXOpen/TaggedObject.hxx"

using namespace NXOpen;
using namespace NXOpen::BlockStyler;

class MyClass
{
    public:
        static void OnButtonClick(const NXOpen::BlockStyler::UIBlock* block)
        {
            Part* workPart = NXOpen::Session::GetSession()->Parts()->Work();

            // 获取Selection控件的block对象
            UIBlock* selectionBlock = block->FindBlock("mySelection");
            Selection* selection = static_cast<Selection*>(selectionBlock->GetReference());

            // 获取选择的点的坐标
            Point3d pickedPoint = BlockStyler::Utilities::PickPoint(workPart);

            // 将选择的点的坐标设置为选择集中的对象的坐标
            SelectionResponse::ObjectInfo objectInfo;
            selection->PickObject("Select an object", "Point", Selection::SelectionScope::AnyInAssembly, 
                                  Selection::SelectionAction::ClearAndEnableSpecific, false, false, objectInfo);
            TaggedObject* pickedObject = TaggedObject::GetTaggedObject(objectInfo.objectTag);
            Point* point = dynamic_cast<Point*>(pickedObject);
            if (point != nullptr)
            {
                point->SetCoordinates(pickedPoint.X, pickedPoint.Y, pickedPoint.Z);
                workPart->ModelingViews()->WorkView()->Regenerate();
            }
        }
};

extern "C" DllExport int ufusr_ask_unload()
{
    return (int)Session::LibraryUnloadOptionImmediately;
}

extern "C" DllExport void ufusr(char* param, int* retCode, int paramLen)
{
    NXOpen::Part* part = NXOpen::Session::GetSession()->Parts()->BaseWork();
    NXOpen::BlockStyler::BlockDialog* dialog = NXOpen::BlockStyler::BlockDialog::Create();
    NXOpen::BlockStyler::UIBlock* selectionBlock = dialog->TopBlock()->FindBlock("mySelection");
    selectionBlock->SetDouble("MinimumWidth", 120.0);
    selectionBlock->SetLogical("AllowMultiple", false);
    selectionBlock->SetAllowedClass("Point");

    NXOpen::BlockStyler::UIBlock* button = dialog->TopBlock()->FindBlock("myButton");
    button->SetDouble("MinimumWidth", 120.0);
    button->SetHandler(MyClass::OnButtonClick);

    dialog->Show();
    delete dialog;
}

在上面的示例中，我们首先获取Selection控件的block对象，然后获取Selection对象。接下来，我们使用BlockStyler::Utilities::PickPoint方法选择一个点，并将选择的点的坐标设置为选择集中的对象的坐标。请注意，我们使用SelectionResponse::ObjectInfo和TaggedObject类获取所选对象，并将其转换为Point类以设置其坐标。

最后，我们更新显示以查看结果。