MsiUseFeatureA function (msi.h)

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

INSTALLSTATE MsiUseFeatureA(
  [in] LPCSTR szProduct,
  [in] LPCSTR szFeature
);

Parameters

[in] szProduct

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

[in] szFeature

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.

Note

The msi.h header defines MsiUseFeature as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

   
Minimum supported client Windows Installer 5.0 on Windows Server 2012, Windows 8, 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 or Windows XP. See the Windows Installer Run-Time Requirements for information about the minimum Windows service pack that is required by a Windows Installer version.
Target Platform Windows
Header msi.h
Library Msi.lib
DLL Msi.dll

See also

Application-Only Functions