arx编程中ado错误-IDispatch* error 3149

Question

我在arx程序设计中 
_ConnectionPtr m_pConnection;
_RecordsetPtr m_pRecordset;
m_pConnection.CreateInstance(_uuidof(Connection)); 
m_pRecordset.CreateInstance(_uuidof(Recordset));
m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\pm\\db1.mdb","","",adModeUnknown);
m_pRecordset->Open("select * from 表1",m_pConnection.GetInterfacePtr(),adOpenKeyset,adLockReadOnly,adCmdText);
//在m_pRecordset->open时出错(IDispatch* error 3149)
哪不对?
谢谢

Answer 1

你没有调用初始化函数
#import "E:\Program Files\Common Files\System\ado\msado15.dll" \
    no_namespace rename("EOF", "EndOfFile")
……
::CoInitialize(NULL)_ConnectionPtr m_pConnection;
_RecordsetPtr m_pRecordset;
m_pConnection.CreateInstance(_uuidof(Connection)); 
m_pRecordset.CreateInstance(_uuidof(Recordset));
m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\pm\\db1.mdb","","",adModeUnknown);
m_pRecordset->Open(("select * from 表1",_variant_t((IDispatch *)pConnection,true),adOpenKeyset,
            adLockOptimistic,adCmdText);……
CoUninitialize( ); 
祝你好运