DWriteCreateFactory Function

Artikel
07/27/2011

Creates a DirectWrite factory object that is used for subsequent creation of individual DirectWrite objects.

Syntax

HRESULT DWriteCreateFactory(
  __in   DWRITE_FACTORY_TYPE factoryType,
  __in   REFIID iid,
  __out  IUnknown **factory
);

Parameter

factoryType [in]
A value that specifies whether the factory object will be shared or isolated.
iid [in]
A GUID value that identifies the DirectWrite factory interface, such as __uuidof(IDWriteFactory).
factory [out]
An address of a pointer to the newly created DirectWrite factory object.

Rückgabewert

Ist Funktion erfolgreich, wird "S_OK" zurückgegeben. Andernfalls wird ein HRESULT-Fehlercode zurückgegeben.

Hinweise

This function creates a DirectWrite factory object that is used for subsequent creation of individual DirectWrite objects. DirectWrite factory contains internal state data such as font loader registration and cached font data. In most cases it is recommended you use the shared factory object, because it allows multiple components that use DirectWrite to share internal DirectWrite state data, and thereby reduce memory usage. However, there are cases when it is desirable to reduce the impact of a component, such as a plug-in from an untrusted source, on the rest of the process, by sandboxing and isolating it from the rest of the process components. In such cases, it is recommended you use an isolated factory for the sandboxed component.

The following example shows how to create a shared DirectWrite factory.


if (SUCCEEDED(hr))
{
    hr = DWriteCreateFactory(
        DWRITE_FACTORY_TYPE_SHARED,
        __uuidof(IDWriteFactory),
        reinterpret_cast<IUnknown**>(&pDWriteFactory_)
        );
}

Anforderungen

Mindestens unterstützter Client	Windows 7, Windows Vista with SP2 and Platform Update for Windows Vista
Mindestens unterstützter Server	Windows Server 2008 R2, Windows Server 2008 with SP2 and Platform Update for Windows Server 2008
Header	Dwrite.h
Bibliothek	Dwrite.lib
DLL	Dwrite.dll

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