MsiDoActionA function (msiquery.h)

The MsiDoAction function executes a built-in action, custom action, or user-interface wizard action.

Syntax

UINT MsiDoActionA(
  [in] MSIHANDLE hInstall,
  [in] LPCSTR    szAction
);

Parameters

[in] hInstall

Handle to the installation provided to a DLL custom action or obtained through MsiOpenPackage, MsiOpenPackageEx, or MsiOpenProduct.

[in] szAction

Specifies the action to execute.

Return value

This function returns UINT.

Remarks

The MsiDoAction function executes the action that corresponds to the name supplied. If the name is not recognized by the installer as a built-in action or as a custom action in the CustomAction table, the name is passed to the user-interface handler object, which can invoke a function or a dialog box. If a null action name is supplied, the installer uses the upper-case value of the ACTION property as the action to perform. If no property value is defined, the default action is performed, defined as "INSTALL".

Actions that update the system, such as the InstallFiles and WriteRegistryValues actions, cannot be run by calling MsiDoAction. The exception to this rule is if MsiDoAction is called from a custom action that is scheduled in the InstallExecuteSequence table between the InstallInitialize and InstallFinalize actions. Actions that do not update the system, such as AppSearch or CostInitialize, can be called.

Requirements

See also

Installer Action Functions