The computer is doing 64 system
Compile software MSDEV3
The access2003 database software (MDB files)

1. Try many times to modify the connection string to nothing
2. Download the mdac components failed

Retrieves the hr;
Try
{
Hr=m_pConnection. CreateInstance (_uuidof (Connection));
If (SUCCEEDED (hr))
{
M_pConnection - & gt; The ConnectionString="File Name=data. Udl";
Hr=m_pConnection - & gt; Open (" ", ""," ", adConnectUnspecified);
If (FAILED (hr))
{
AfxMessageBox (" open file!" );
Return TRUE;
}

}
The else
{
AfxMessageBox (" createinstance of Connection fail!" );
Return TRUE;
}
}
Catch _com_error (e)
{
_bstr_t bstrSource (e.S ource ());
_bstr_t bstrDescription (e.D escription ());
AfxMessageBox (bstrSource + bstrDescription);
Return TRUE;
}
InitListCtr ();

CodePudding user response:

Are doing with vs2015, then ado database access

CodePudding user response:

A few years ago, when asked this question a lot, then the ADO component upgrade, GUID change
Your code to use the GUID with system do not match the GUID registered, so no registered
You can copy ADO a version, and then the code into the file, so the GUID is fixed this version