Re: Loading a .dll in ActiveX

From:

Ajay Kalra <ajaykalra@yahoo.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Thu, 3 Apr 2008 08:23:03 -0700 (PDT)

Message-ID:

<924febc7-3449-49cb-9f3a-351b07a38b9f@b1g2000hsg.googlegroups.com>

Why not debug and see where the error is coming rather than taking a
guess. In addition, I am assuming you are putting path to DEBUG only
for testing when loading a DLL. This doesnt make sense in production
code.

Its also possible that your DLL depends upon other DLLs which are not
found when you try to load your control. Run Depens.exe on your DLL
and see if it can find all the modules it needs.

--
Ajay

On Apr 3, 10:29 am, rbickert <rbick...@discussions.microsoft.com>
wrote:

I'm currently attempting to successfully wrap a dll with an activex ocx. So
far it has gone well and I have compiled my program, which is quite large.
When I attempt to run the ocx is the Test Container, I get a "Failed to
create control:Unspecified error" message. I'm assuming it has to do with how
I implement the dll. I have tried two ways, which are listed below.

============================================================
BOOL CActiveXPropPage::OnInitDialog()
{
    CDialog::OnInitDialog();

// Load the DLL library

m_hLib = LoadLibraryW
((LPCWSTR)"..\\..\\DAPassThru\\Debug\\DAPassThru.dll");
if( m_hLib || (m_hLib = (LoadLibraryW((LPCWSTR)"DAPassThru.dll")) ) )
{
    if( !LoadProcs() ) // Load the DLL
entry points
        WriteDebugString("Could NOT get all proc addresses");

    if( m_DADllVersion )
        m_DADllVersion( &m_DAMajor, &m_DAMinor, &m_DARelease );

// outputDebug("Loaded DAPassThruDll Version %d.%d.%d", m_DAMajor,
m_DAMinor, m_DARelease);

    if( m_DAOpen )
        m_DAOpen( &m_hDA, &m_uFlags, &CallBack, NULL );

// outputDebug("Opened DAPassThruDll with %d flags", m_uFlags);

// updateMenus( m_uFlags );

    if( m_DASetDebug )
        m_DASetDebug( TRUE );}

else return 0;
==========================================================

and

==========================================================
BOOL CActiveXApp::InitInstance()
{
    BOOL bInit = COleControlModule::InitInstance();
// m_hButtonControl = NULL;
    if (bInit)
    //Loading the .dll 'cause its a ***!
        m_hButtonControl= ::LoadLibrary( _T( "dapassthru.dll" ));
    return bInit;

    if (m_hButtonControl == NULL)
    {
        return bInit;
    }}

=========================================================

Is there a better way to load a dll? Both methods compile, but I still get
the same error message. The dll is also located in the same directory as the
ocx when I run it. Could it be possible that it is due to something else? Any
help would be greatly appreciated. Thanks guys.