Commit 4326303

[SUBEDIT Sample: Superclasses a Standard Windows Control](http://msdn.microsoft.com/30e46bdc-ed92-417c-b6b8-359017265a7b)

The **Data Source** button lets you set up the specified data source using the specified OLE DB provider. When you click this button, the **Data Link Properties** dialog box appears. For more information on building connection strings and the **Data Link Properties** dialog box, see [Data Link API Overview](https://msdn.microsoft.com/library/ms718102.aspx) in the Windows SDK documentation.

Select the check boxes to specify the kinds of updates to be supported in the consumer (the default is none). Each of the following will set [DBPROP_IRowsetChange](https://msdn.microsoft.com/library/ms715892.aspx) and the appropriate entries for [DBPROP_UPDATABILITY](https://msdn.microsoft.com/library/ms722676.aspx) in the property set map.

[Connection Strings and Data Links (OLE DB)](https://msdn.microsoft.com/library/ms718376.aspx)

You can specify project properties (for example, [whether to link statically to the CRT](../../atl/programming-with-atl-and-c-run-time-code.md)) in the [Project Properties](../../ide/general-property-page-project.md) page, and you can set [build configurations](/visualstudio/ide/understanding-build-configurations) for an ATL project. See [Using Projects to Build Applications](http://msdn.microsoft.com/3339fa90-bac2-4b95-8361-662a2e0e7dfe) for more information.

[UpdatePV Sample](../../visual-cpp-samples.md)

|[CComAggObject::CreateInstance](#createinstance)|This static function allows you to create a new **CComAggObject<** `contained` **>** object without the overhead of [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615).|

This static function allows you to create a new **CComAggObject<**`contained` **>** object without the overhead of [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615).

A standard HRESULT value. See [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615) in the Windows SDK for a description of possible return values.

In the following example, `CDocument` is a wizard-generated ATL class derived from `CComCoClass` that implements the `IDocument` interface. The class is registered in the object map with the OBJECT_ENTRY_NON_CREATEABLE_EX_AUTO macro so clients can't create instances of the document using [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615). `CApplication` is a CoClass that provides a method on one of its own COM interfaces to create instances of the document class. The code below shows how easy it to create instances of the document class using the `CreateInstance` member inherited from the `CComCoClass` base class.

This static function allows you to create a new **CComObject<**`Base`**>** object, without the overhead of [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615).

|[CComPolyObject::CreateInstance](#createinstance)|(Static) Allows you to create a new **CComPolyObject<** `contained` **>** object without the overhead of [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615).|

Allows you to create a new **CComPolyObject<**`contained` **>** object without the overhead of [CoCreateInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615).

Returns S_OK on success, or REGDB_E_CLASSNOTREG, CLASS_E_NOAGGREGATION, CO_E_CLASSSTRING or E_NOINTERFACE on failure. See [CoCreateClassInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615) and [CLSIDFromProgID](http://msdn.microsoft.com/library/windows/desktop/ms688386) for a description of these errors.

If the first form of the method is called, [CLSIDFromProgID](http://msdn.microsoft.com/library/windows/desktop/ms688386) is used to recover the CLSID. Both forms then call [CoCreateClassInstance](http://msdn.microsoft.com/library/windows/desktop/ms686615).