The MsiEnumComponentQualifiers function enumerates the advertised qualifiers for the given component. This function retrieves one qualifier each time it is called.

Syntax

C++UINT MsiEnumComponentQualifiers(
  __in     LPTSTR szComponent,
  __in     DWORD iIndex,
  __out    LPTSTR lpQualifierBuf,
  __inout  DWORD *pcchQualifierBuf,
  __out    LPTSTR lpApplicationDataBuf,
  __inout  DWORD *pcchApplicationDataBuf
);

Parameters

szComponent [in]

Specifies component whose qualifiers are to be enumerated.

iIndex [in]

Specifies the index of the qualifier to retrieve. This parameter should be zero for the first call to the MsiEnumComponentQualifiers function and then incremented for subsequent calls. Because qualifiers are not ordered, any new qualifier has an arbitrary index. This means that the function can return qualifiers in any order.

lpQualifierBuf [out]

Pointer to a buffer that receives the qualifier code.

pcchQualifierBuf [in, out]

Pointer to a variable that specifies the size, in characters, of the buffer pointed to by the lpQualifierBuf parameter. On input, this size should include the terminating null character. On return, the value does not include the null character.

lpApplicationDataBuf [out]

Pointer to a buffer that receives the application registered data for the qualifier. This parameter can be null.

pcchApplicationDataBuf [in, out]

Pointer to a variable that specifies the size, in characters, of the buffer pointed to by the lpApplicationDataBuf parameter. On input, this size should include the terminating null character. On return, the value does not include the null character. This parameter can be null only if the lpApplicationDataBuf parameter is null.

Return Value

Value	Meaning
ERROR_BAD_CONFIGURATION	The configuration data is corrupt.
ERROR_INVALID_PARAMETER	An invalid parameter was passed to the function.
ERROR_MORE_DATA	A buffer is to small to hold the requested data.
ERROR_NO_MORE_ITEMS	There are no qualifiers to return.
ERROR_NOT_ENOUGH_MEMORY	The system does not have enough memory to complete the operation. Available with Windows Server 2003.
ERROR_SUCCESS	A value was enumerated.
ERROR_UNKNOWN_COMPONENT	The specified component is unknown.

 

Remarks

To enumerate qualifiers, an application should initially call the MsiEnumComponentQualifiers function with the iIndex parameter set to zero. The application should then increment the iIndex parameter and call MsiEnumComponentQualifiers until there are no more qualifiers (that is, until the function returns ERROR_NO_MORE_ITEMS).

When MsiEnumComponentQualifiers returns, the pcchQualifierBuf parameter contains the length of the qualifier string stored in the buffer. The count returned does not include the terminating null character. If the buffer is not big enough, MsiEnumComponentQualifiers returns ERROR_MORE_DATA, and this parameter contains the size of the string, in characters, without counting the null character. The same mechanism applies to pcchDescriptionBuf.

When making multiple calls to MsiEnumComponentQualifiers to enumerate all of the component's advertised qualifiers, each call should be made from the same thread.

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	MsiEnumComponentQualifiersW (Unicode) and MsiEnumComponentQualifiersA (ANSI)

See Also

System Status Functions

Send comments about this topic to Microsoft

Build date: 8/13/2009