Session.Message method

The Message method of the Session object performs any enabled logging operations and defers execution to the UI handler object associated with the engine. Logging may be selectively enabled for the various message types. See the EnableLog method.

If record field 0 contains a formatting string, it is used to format the data in the other fields. Else if the message is an error, warning, or user message, an attempt is made to find a message template in the Error table for the current database using the error number found in field 1 of the record for message types and return values.

Session.Message(
  kind,
  record
)

kind

The kind parameter is required to be one of the following values. To display a message box with push buttons and icons, calculate the value of kind by adding the standard message box styles used by MessageBox and MessageBoxEx to msiMessageTypeError, msiMessageTypeWarning, or msiMessageTypeUser. For more information see the Remarks section below.

Expand table

Constant	Meaning
msiMessageTypeFatalExit &H00000000	Premature termination, possibly fatal out of memory.
msiMessageTypeError &H01000000	Formatted error message, [1] is message number in Error table.
msiMessageTypeWarning &H02000000	Formatted warning message, [1] is message number in Error table.
msiMessageTypeUser &H03000000	User request message, [1] is message number in Error table.
msiMessageTypeInfo &H04000000	Informative message for log, not to be displayed.
msiMessageTypeFilesInUse &H05000000	List of files in use that need to be replaced.
msiMessageTypeResolveSource &H06000000	Request to determine a valid source location.
msiMessageTypeOutOfDiskSpace &H07000000	Insufficient disk space message.
msiMessageTypeActionStart &H08000000	Start of action, [1] action name, [2] description, [3] template for ACTIONDATA messages.
msiMessageTypeActionData &H09000000	Action data. Record fields correspond to the template of ACTIONSTART message.
msiMessageTypeProgress &H0A000000	Progress bar information. See the description of record fields below.
msiMessageTypeCommonData &H0B000000	To enable the Cancel button set [1] to 2 and [2] to 1. To disable the Cancel button set [1] to 2 and [2] to 0

 

record

Required Record object containing a message-specific field.

Message Record Fields

The following describes the record field definitions when msiMessageTypeProgress is passed as the message type.

Field 1 specifies the type of the progress message. The meaning of the other fields depend upon the value in this field. The possible values that can be set into Field 1 are as follows.

The meaning of Field 2 depends upon the value in Field 1 as follows.

The meaning of Field 3 depends upon the value in Field 1 as follows.

The meaning of Field 4 depends upon the value in Field 1 as follows.

Displaying Message Boxes

To display a message box with push buttons and icons, calculate the value of kind by adding the standard message box styles used by MessageBox and MessageBoxEx to msiMessageTypeError, msiMessageTypeWarning, or msiTypeUser. The available push button options for VBScript are vbOKOnly (MB_OK), vbOKCancel (MB_OKCANCEL), vbAbortRetryIgnore (MB_ABORTRETRYIGNORE), vbYesNoCancel (MB_YESNOCANCEL), vbYesNo (MB_YESNO), and vbRetryCancel (MB_RETRYCANCEL). The available icon options for VBScript are vbCritical (MB_ICONERROR), vbQuestion (MB_ICONQUESTION), vbExclamation (MB_ICONWARNING), and vbInformation (MB_ICONINFORMATION).

For example, the following call sends a msiMessageTypeError message with the vbExclamation icon and vbYesNo buttons.

Session.Message &H01000034, record

If a custom action calls the Message method, the custom action should be capable of handling a cancellation by the user and should return msiDoActionStatusUserExit.