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The OnCreate Method

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[The feature associated with this page, Windows Media Player SDK, is a legacy feature. It has been superseded by MediaPlayer. MediaPlayer has been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer instead of Windows Media Player SDK, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The OnCreate method is called when the plug-in window is first created.

The following code is used to implement this method:

LRESULT OnCreate(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    HWND hCtrl = ::CreateWindowEx(0L, _T("BUTTON"), _T("Search"),
        WS_CHILD | BS_PUSHBUTTON, 10, 10, 100, 30, m_hWnd, 
        (HMENU)IDC_SEARCH, _Module.GetResourceInstance(), NULL);
    ::ShowWindow(hCtrl, SW_SHOW );
    return 0;
}

This method creates the Search button and associates it with the IDC_SEARCH command ID, which is defined at the beginning of the file:

#define IDC_SEARCH 2000

This command ID is mapped to the OnSearch method in the message map section described previously.

Implementing CPluginWindow