Creating Controls Dynamically in ATL

As in MFC, you can create controls dynamically with ATL. The steps required are these:

Insert the appropriate #import statement in the dialog header file or in the StdAfx.h file.

Add two member variables to your dialog or window class:

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CAxWindow m_wndPrinter; // host window IVSPrinterPtr m_spPrinter; // pointer to control

When the dialog or window is created, create the control and its host window.

Example Title	Copy Code
// initialize ATL ActiveX hosting AtlAxWinInit(); // create the control (will fail if not registered) m_spPrinter.CreateInstance(__uuidof(VSPrinter))); ATLASSERT(m_spPrinter != NULL); // create the host window (nID = IDC_VSPRINTER1) // the nID is needed if you want to sink events. RECT rc; GetClientRect(&rc); m_wndPrinter.Create(m_hWnd, rc, NULL, WS_CHILD \| WS_VISIBLE, 0, IDC_ VSPRINTER1);

Example Title

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// initialize ATL ActiveX hosting

AtlAxWinInit();

 

// create the control (will fail if not registered)

m_spPrinter.CreateInstance(__uuidof(VSPrinter)));

ATLASSERT(m_spPrinter != NULL);

 

// create the host window (nID = IDC_VSPRINTER1)

// the nID is needed if you want to sink events.

RECT rc;

GetClientRect(&rc);

m_wndPrinter.Create(m_hWnd, rc, NULL, WS_CHILD | WS_VISIBLE,

                    0, IDC_ VSPRINTER1);

Attach the control to the host window.

Example Title	Copy Code
CComPtr<IAxWinHostWindow> spHost; m_wndPrinter.QueryHost(&spHost); spHost->AttachControl(m_spPrinter, m_wndPrinter);

As in MFC, this approach requires you to hook up the event handlers manually. You can also copy wizard-generated code, which does two things: it adds an IDispEventImpl declaration to your class so it inherits the ATL event handling mechanisms and adds an event sink map to your class using BEGIN_SINK_MAP, SINK_ENTRY and END_SINK_MAP macros. You still need to add the call to AtlAdviseSinkMap in order to start getting the events.