我在C ++ / CLI包装器中使用了C#dll。 dll返回一个ADODB :: Recordset ^对象,但是我需要包装器来返回一个_RecordsetPtr对象。 我怎样才能在两者之间进行转换?
这是我到目前为止所拥有的。我遇到的问题是,在for循环的最后一行之后,该函数跳转到return语句并结束。它不会继续循环,并且它不会击中" Object ^ rows =。 。 "线。
_RecordsetPtr TraserInterface::GetDistributorRecordset()
{
ADODB::Recordset^ recordset = TraserWrapper::Instance->traserInterface->DistributorRecordset;
ADODB::Fields^ fields = ((ADODB::RecordsetClass^)recordset)->default;
HRESULT hr;
_RecordsetPtr recordsetPtr("ADODB.Recordset");
for (int i = 0; i < fields->Count; i++)
{
ADODB::Field^ field = fields[i];
String^ fieldName = field->Name;
_bstr_t bstrName = MarshalString(fieldName).c_str();
int type = (int)field->Type;
int definedSize = field->DefinedSize;
int fieldAttrib = field->Attributes;
hr = recordsetPtr->Fields->Append(bstrName, (DataTypeEnum)type, definedSize, (FieldAttributeEnum)fieldAttrib);
}
Object^ rows = recordset->GetRows((int)ADODB::GetRowsOptionEnum::adGetRowsRest, (Object^)ADODB::BookmarkEnum::adBookmarkFirst, (Object^)fields);
// loop through rows and populate recordsetPtr . . .
return recordsetPtr;
}
答案 0 :(得分:1)
感谢Hans Passant,我找到了解决方案:
_RecordsetPtr TraserInterface::GetDistributorRecordset()
{
ADODB::Recordset^ recordset = TraserWrapper::Instance->traserInterface->DistributorRecordset);
IntPtr recordsetIntPtr = Marshal::GetIUnknownForObject(recordset);
IUnknown* unknown = (IUnknown*)(void*)recordsetIntPtr;
_RecordsetPtr recordsetPtr(unknown);
return recordsetPtr;
}