我已经在c ++中实现了vb功能,我已经在c ++中替换了以下逻辑,但是却出现了问题:
我必须从VB转换为c ++,并且在获取属性时c ++中的代码崩溃。
原始VB代码:
For Each loTDef In aoDBUser.TableDefs
Set loProp = Nothing
On Error Resume Next
Set loProp = loTDef.Properties("Description")
If Not loProp Is Nothing Then
If loProp.Value = TEMP_TABLE Then
End If
End If
Next
新的C ++代码:
CString test::Property()
{
//
// OVERVIEW:
// Get the value for the given Custom Property
//
DAOProperties *pColProp = NULL;
DAOProperty *pProp = NULL;
CDaoDatabase cDBase;
cDBase.Open(CV_GetUserDatabasePath(_T("TEST.mdb")));
CString strDbVer;
DAOProperties* pPrp = 0;
DAOProperty* pRev = 0;
try
{
if ( !cDBase.IsOpen() )
return(_T(""));
DAO_CHECK(cDBase.m_pDAODatabase->get_Properties(&pPrp));
if ( pPrp != 0 )
{
COleVariant varRevVal;
COleVariant varName(_T("Description"), VT_BSTRT);
DAO_CHECK(pPrp->get_Item(varName, &pRev));//crashing going to catch
if (pRev != 0)
{
DAO_CHECK(pRev->get_Value(&varRevVal));
pRev->Release();
pRev = 0;
}
pPrp->Release();
pPrp = 0;
strDbVer = V_BSTRT(&varRevVal);
}
}
catch (...)
{
}
cDBase.Close();
}
它在DAO_CHECK(pPrp->get_Item(varName, &pRev));
中崩溃的方式
但是我不知道为什么会这样。