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MsiEnableLogW function (msi.h)

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The MsiEnableLog function sets the log mode for all subsequent installations that are initiated in the calling process.

Syntax

UINT MsiEnableLogW(
  [in] DWORD   dwLogMode,
  [in] LPCWSTR szLogFile,
  [in] DWORD   dwLogAttributes
);

Parameters

[in] dwLogMode

Specifies the log mode. This parameter can be one or more of the following values.

Value Meaning
INSTALLLOGMODE_FATALEXIT
 Logs out of memory or fatal exit information.
INSTALLLOGMODE_ERROR
 Logs the error messages.
INSTALLLOGMODE_EXTRADEBUG
 Sends extra debugging information, such as handle creation information, to the log file.

Windows 2000 and Windows XP:  This feature is not supported.
INSTALLLOGMODE_WARNING
 Logs the warning messages.
INSTALLLOGMODE_USER
 Logs the user requests.
INSTALLLOGMODE_INFO
 Logs the status messages that are not displayed.
INSTALLLOGMODE_RESOLVESOURCE
 Request to determine a valid source location.
INSTALLLOGMODE_OUTOFDISKSPACE
 Indicates insufficient disk space.
INSTALLLOGMODE_ACTIONSTART
 Logs the start of new installation actions.
INSTALLLOGMODE_ACTIONDATA
 Logs the data record with the installation action.
INSTALLLOGMODE_COMMONDATA
 Logs the parameters for user-interface initialization.
INSTALLLOGMODE_PROPERTYDUMP
 Logs the property values at termination.
INSTALLLOGMODE_VERBOSE
 Logs the information in all the other log modes, except for INSTALLLOGMODE_EXTRADEBUG. This sends large amounts of information to a log file not generally useful to users. May be used for technical support.
INSTALLLOGMODE_LOGONLYONERROR
 Logging information is collected but is less frequently saved to the log file. This can improve the performance of some installations, but may have little benefit for large installations. The log file is removed when the installation succeeds. If the installation fails, all logging information is saved to the log file.

Windows Installer 2.0:  This log mode is not available.

[in] szLogFile

Specifies the string that holds the full path to the log file. Entering a null disables logging, in which case dwlogmode is ignored. If a path is supplied, then dwlogmode must not be zero.

[in] dwLogAttributes

Specifies how frequently the log buffer is to be flushed.

Value Meaning
INSTALLLOGATTRIBUTES_APPEND
 If this value is set, the installer appends the existing log specified by szLogFile. If not set, any existing log specified by szLogFile is overwritten.
INSTALLLOGATTRIBUTES_FLUSHEACHLINE
 Forces the log buffer to be flushed after each line. If this value is not set, the installer flushes the log buffer after 20 lines by calling FlushFileBuffers.

Return value

Value Meaning
ERROR_INVALID_PARAMETER
 An invalid log mode was specified.
ERROR_SUCCESS
 The function succeeded.

Remarks

For a description of the Logging policy, see System Policy.

The path to the log file location must already exist when using this function. The Installer does not create the directory structure for the log file.

Note

The msi.h header defines MsiEnableLog as an alias that 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 is not encoding-neutral can lead to mismatches that result in compilation or runtime errors. For more information, see Conventions for Function Prototypes.

Requirements

Requirement Value
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

Interface and Logging Functions

Logging