The MsiUseFeature function increments the usage count for a particular feature and indicates the installation state for that feature. This function should be used to indicate an application's intent to use a feature.

Syntax

C++INSTALLSTATE MsiUseFeature(
  __in  LPCTSTR szProduct,
  __in  LPCTSTR szFeature
);

Parameters

szProduct [in]

Specifies the product code for the product that owns the feature to be used.

szFeature [in]

Identifies the feature to be used.

Return Value

Value	Meaning
INSTALLSTATE_ABSENT	The feature is not installed.
INSTALLSTATE_ADVERTISED	The feature is advertised
INSTALLSTATE_BADCONFIG	The configuration data is corrupt.
INSTALLSTATE_INVALIDARG	Invalid function argument.
INSTALLSTATE_LOCAL	The feature is locally installed and available for use.
INSTALLSTATE_SOURCE	The feature is installed from the source and available for use.
INSTALLSTATE_UNKNOWN	The feature is not published.

 

Remarks

The MsiUseFeature function should only be used on features known to be published. INSTALLSTATE_UNKNOWN indicates that the program is trying to use a feature that is not published. The application should determine whether the feature is published before calling MsiUseFeature by calling MsiQueryFeatureState or MsiEnumFeatures. The application should make these calls while it initializes. An application should only use features that are known to be published.

Requirements

Version	Windows Installer 5.0 on Windows Server 2008 R2 or Windows 7. Windows Installer 4.0 or Windows Installer 4.5 on Windows Server 2008 or Windows Vista. Windows Installer on Windows Server 2003, Windows XP, and Windows 2000. See the Windows Installer Run-Time Requirements for information about the minimum Windows service pack that is required by a Windows Installer version.
Header	Msi.h
Library	Msi.lib
DLL	Msi.dll
Unicode and ANSI names	MsiUseFeatureW (Unicode) and MsiUseFeatureA (ANSI)

See Also

Application-Only Functions

Send comments about this topic to Microsoft

Build date: 8/13/2009