[C++ CE]放置参数化单元时修改参数值

Question

//ElmentHandler eh;(参数化单元)

FindInstancesScopePtr scope = FindInstancesScope::CreateScope(eh, FindInstancesScopeOption(DgnECHostType::All)); ECQueryPtr query = ECQuery::CreateQuery(ECQUERY_PROCESS_SearchAllClasses); DgnECInstanceIterable iterable = Bentley::DgnPlatform::DgnECManager::GetManager().FindInstances(*scope, *query); for (DgnECInstanceIterable::const_iterator it = iterable.begin(); it != iterable.end(); ++it) { DgnECInstancePtr instance = *it; ECN::ECClassCR instanceClass = instance->GetClass(); WString classDisplayName = instanceClass.GetDisplayLabel(); 
 ECPropertyIterable properties = instanceClass.GetProperties(); for (ECPropertyIterable::const_iterator it = properties.begin(); it != properties.end(); ++it) { ECValue v; ECPropertyCP pProp = (*it); if (pProp->GetName().find(L"ParameterValuesContainer")) continue; 
 ECValue v1; 
 WCharCP propertyAccessString = pProp->GetName().c_str(); ECObjectsStatus status = instance->GetValue(v1, propertyAccessString, 0); if (ECOBJECTS_STATUS_Success != status) continue; 
 } 
 } 
 
 现在我能获取ECValue v1，调试看到其如下形式: 
 
 看了下帮助文档没发现读取struct里面的值的函数，希望得到大家的帮助！

郑 岗 · Accepted Answer

C++提取一个属性为数组的情况需要通过以下步骤完成： 
 
 首先通过属性名获取ECValue，判断ECValue是否为Array数组，如果是提取ArrayInfo; 
 通过ArrayInfo获取当前属性包含数组元素个数，以便提供数组索引； 
 再次根据该属性名和数组索引（遍历），获取ECValue,如果该ECValue包含Struct(结构体)，则需要通过以下语句获取 IECInstance ； 
 IECInstancePtr _intance = v . GetStruct (); 
 该结构体属性获取跟常规一样，详细步骤看以下代码加深影响： 
 
 FindInstancesScopePtr scope = FindInstancesScope::CreateScope((ElementHandleCR)*entry, FindInstancesScopeOption(DgnECHostType::All));
	ECQueryPtr query = ECQuery::CreateQuery(ECQUERY_PROCESS_SearchAllClasses);
	DgnECInstanceIterable iterable = Bentley::DgnPlatform::DgnECManager::GetManager().FindInstances(*scope, *query);
	int i = 0;
	for (DgnECInstanceIterable::const_iterator it = iterable.begin(); it != iterable.end(); ++it)
	{
 DgnECInstancePtr instance = *it;
 WString filename;
 filename.Sprintf(L"D:\%d.xml", i);
 instance->WriteToXmlFile(filename.data(), true, true);
 ECN::ECClassCR instanceClass = instance->GetClass();
 WString classDisplayName = instanceClass.GetDisplayLabel();
 wprintf(L"%s
", classDisplayName.data());
 ECPropertyIterable properties = instanceClass.GetProperties();
 for (ECPropertyIterable::const_iterator it = properties.begin(); it != properties.end(); ++it)
 {
 ECValue v;
 ECPropertyCP pProp = (*it);
 if (pProp->GetName().Equals(L"ParameterValuesContainer")){
 if (pProp->GetIsArray())
 {
 //输出参数化单元参数定义有哪些属性
 ArrayECPropertyCP aep = pProp->GetAsArrayProperty();
 ECN::ECClassCP _instanceClass = aep->GetStructElementType();
 ECPropertyIterable _properties = _instanceClass->GetProperties(false);
 wprintf(L"ECClass:%s
", _instanceClass->GetName().data());
 for (ECPropertyIterable::const_iterator it1 = _properties.begin(); it1 != _properties.end(); ++it1)
 {
 wprintf(L"PropertyName:%s：Type:%s
", (*it1)->GetName().data(), (*it1)->GetTypeName().data());
 }
 /*
 输出信息为：
 DgnCellParameters
 PropertyName:Adhoc_Name：Type:string
 PropertyName:Adhoc_Value：Type:string
 PropertyName:Adhoc_Label：Type:string
 PropertyName:Adhoc_Type：Type:int
 PropertyName:Adhoc_ExtendType：Type:string
 PropertyName:Adhoc_Unit：Type:string
 PropertyName:Adhoc_IsReadOnly：Type:boolean
 PropertyName:Adhoc_IsHidden：Type:boolean
 PropertyName:Meta_DefinitionScope：Type:boolean
 PropertyName:Meta_Hidden：Type:boolean
 可以看出参数定义信息各个属性的名称和类型，可以看出我们只需要提取Adhoc_Label和Adhoc_Value就可以了
 两个属性都是String类型
 */
 //获取数组个数
 instance->GetValue(v, pProp->GetName().data());
 ArrayInfo ai = v.GetArrayInfo();
 int count = ai.GetCount();

 for (int index = 0; index < count; index++)
 {
 wprintf(L"---------------index:%d---------------
", index);
 instance->GetValue(v, pProp->GetName().data(), index);
 if (v.IsStruct()) wprintf(L"Struct
");
 IECInstancePtr _intance = v.GetStruct();
 for (ECPropertyIterable::const_iterator it1 = _properties.begin(); it1 != _properties.end(); ++it1)
 {
 if ((*it1)->GetName().Equals(L"Adhoc_Label") || (*it1)->GetName().Equals(L"Adhoc_Value"))
 {
 ECValue _v;
 _intance->GetValue(_v, (*it1)->GetName().data());
 if (_v.IsUtf8())
 {
 Utf8CP _string = _v.GetUtf8CP();
 WString string(_string);
 wprintf(L"PropertyName:%s：Value:%s
", (*it1)->GetName().data(), string.data());
 }
 else
 {
 WCharCP string = _v.GetString();
 wprintf(L"PropertyName:%s：Value:%s
", (*it1)->GetName().data(), string);
 }

 }

 }

 }

 }
 else{
 printf("Not Array
");
 }
 }
 }
 i++;
	} 
 详细请看注释，结果输出为：

[C++ CE]放置参数化单元时修改参数值

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