菜鸟在线等 C++连接数据库出问题 请教高手

Question

#import "C:\Program Files\Common Files\System\ado\msado15.dll" no_namespace rename("EOF", "adoEOF")

 _ConnectionPtr m_pConnection;
 _RecordsetPtr m_pRecordset;
 _CommandPtr m_pCommand;
 HRESULT hr;
 try{
  	CoInitialize(NULL);
  	hr = m_pConnection.CreateInstance("ADODB.Connection");
  	if(SUCCEEDED(hr)) {
   		CString strCon = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Address.mdb";
   		hr = m_pConnection->Open(_bstr_t(strCon.GetBuffer(0)),"","",adModeReadWrite);
// 		m_pConnection->ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Address.mdb";
// 		hr = m_pConnection->Open("","","",adModeReadWrite);
   		m_pRecordset.CreateInstance("ADODB.Recordset");
   		_variant_t RecordsAffected;
   		m_pRecordset = m_pConnection->Execute("select * from Linkman",&RecordsAffected,adCmdText);
   		m_dataGrid.SetRefDataSource((LPUNKNOWN)m_pRecordset);
   		m_dataGrid.Refresh();
   		_variant_t vIndex = long(0);
   		_variant_t vCount = m_pRecordset->GetCollect(vIndex);
   		m_pRecordset->Close();
   		m_pConnection->Close();
   		CString strMessage;
   		strMessage.Format("共有%d条记录",vCount.iVal);
   		AfxMessageBox(strMessage);
   		MessageBox("连接成功");
   		CoUninitialize(); 
   		m_dataGrid.UpdateData(false);
  	} 
 }catch(_com_error e) {
 	CString erroraessage;
  	erroraessage.Format("连接数据库失败！\r\n错误信息：%s",e.ErrorMessage());
  	AfxMessageBox(erroraessage);
 } 

在open方法的时候抛出异常 是什么原因呢 

Answer 1

我调好很长时间就是过不去，想问问C++高手代码有没有问题

Answer 2

把错误返回码打出来不就知道为什么了.

hr是多少

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