The MsiUseFeatureEx 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 MsiUseFeatureEx(
  __in  LPCTSTR szProduct,
  __in  LPCTSTR szFeature,
  __in  DWORD dwInstallMode,
  __in  DWORD dwReserved
);

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.

dwInstallMode [in]

This parameter can have the following value.

Value	Meaning
INSTALLMODE_NODETECTION	Return value indicates the installation state.

 

dwReserved [in]

Reserved for future use. This value must be set to 0.

Return Value

Value	Meaning
INSTALLSTATE_ABSENT	The feature is not installed.
INSTALLSTATE_ADVERTISED	The feature is advertised
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 MsiUseFeatureEx 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	MsiUseFeatureExW (Unicode) and MsiUseFeatureExA (ANSI)

See Also

Application-Only Functions

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Build date: 8/13/2009