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DAO database initialization

Posted on 1998-12-01
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Last Modified: 2012-05-04
My application is a Win32 console application, using MFC as a static library.  When I execute the following code I get a strange problem.  When the AfxDaoInit() function is called I am not able to clear the history list of iexplorer 4.0 . (From the view menu select the internet options , clear history). iexplorer application doesnot respond until my application exits. The code is as below.

#include <afxdao.h>
#include <windows.h>


int main()
{
      CDaoDatabase obj_Database;

      AfxDaoInit();
      try
      {
      obj_Database.Open("mydata.mdb", FALSE, FALSE);
      }
      catch (CDaoException* e)
      {      
            int iIndex;
            
            for(iIndex = 0; iIndex < e->GetErrorCount(); iIndex++)
            {
                  e->GetErrorInfo(iIndex);
                  printf("%s\n", (e->m_pErrorInfo)->m_strDescription);
            }
            return(FALSE);
      }
      getchar(); // this is to keep my app running.
      db.Close();
      obj_Database.Close();
      AfxDaoTerm();
      return(TRUE);
}
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Question by:necjc
1 Comment
 

Accepted Solution

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necfm earned 100 total points
ID: 1969738
The problem is that COM  creates an invisible window which must have a message loop running. When IE generates "broadcast" messages the desktop will hang if not all windows respond!
The AfxDaoInit() probably calls CoInitialize() which creates a new COM-apartment (and a window), you have to dispatch messages in this thread to avoid these problems and also to get COM to work.
A simple loop like this will solve the problem in your test program:Replace getchar(); with

  MSG msg;
  while (GetMessage(&msg,NULL,0,0) == 1) {
   TranslateMessage(&msg);
   DispatchMessage(&msg);
}

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