Summary

Synopsis

Windows Installer Service has built-in functionality that allows setup developers to exit or continue with the setup based on the custom action return codes.

This article discusses custom action return codes of DLL and VBScript type of custom actions.

Discussion

You can use custom actions of type DLL and VBScript in Express to exit or continue with the installation based on the return codes.

The following chart demonstrates the return codes of DLL and VBScript custom actions to exit or continue setups:

Return Codes

UINT __stdcall Myfunction(MSIHANDLE hInstall)
{
 int nreturnValue;
 nreturnValue = MessageBox(0, "Would you like to continue with the setup?", "Exit Code Test", MB_YESNO);
 if (nreturnValue == IDYES)
  return 0;
 else
  return 2;
}

Additional Information

Executables being launched via custom actions should always return 0 for success. The Windows Installer errors out if an EXE type custom action returns any number other than 0.

More information on this topic can be found in the MSI Help topic Custom Action Return Values.