How to check if an OLEDB driver is installed on the system?

Question

How can I make sure that a certain OLEDB driver is installed when I start my application? I use ADO from Delphi and would like to display a descriptive error message if the

Answer 1

namespace Common {
  public class CLSIDHelper {

  [DllImport("ole32.dll")]
  static extern int CLSIDFromProgID([MarshalAs(UnmanagedType.LPWStr)] string lpszProgID, out Guid pclsid);


  public static Guid RetrieveGUID(string Provider) {
    Guid CLSID = Guid.Empty;
    int Ok = CLSIDFromProgID(Provider, out CLSID);
    if (Ok == 0)
       return CLSID;
    return null;
  }
 }
}