Updated installer with custom action

installer/src/installer-lib/database.cpp

 /**
  * \file database.h MSI database
  */
 
 #include "database.h"
 #include "msiquery.h"
 
 //-----------------------------------------------------------------------------------------
 // Database
 //-----------------------------------------------------------------------------------------
-/**
- * \par Implementation Notes
- *    An MSI database handle is an overloaded type, used both for installation databases and one opened outside an installation.
- *    Hence this base constructor initializes with that handle.
- * 
- * \sa MSDN "Obtaining a Database Handle"
- *    http://msdn.microsoft.com/en-us/library/windows/desktop/aa370541(v=vs.85).aspx
- */
-Database::Database( MSIHANDLE handle )
-  : handle( handle )
+msi_handle Database::open_view( const wchar_t * query )
 {
-}
-
-Database::~Database()
-{
-  MsiCloseHandle( handle ) ;
+  MSIHANDLE view_handle ;
+  UINT x = MsiDatabaseOpenView( handle, query, & view_handle ) ;
+  if ( x == ERROR_BAD_QUERY_SYNTAX )
+  {
+    throw std::runtime_error( "Bad MSI query syntax" ) ;
+  }
+  else if ( x == ERROR_INVALID_HANDLE )
+  {
+    throw std::runtime_error( "Invalid handle" ) ;
+  }
+  return msi_handle( view_handle ) ;
 }
 
 //-----------------------------------------------------------------------------------------
 // Installation_Database
 //-----------------------------------------------------------------------------------------
 
 /**
  * Helper function for Installation_Database constructor.
  *
  * \par Resource Allocator
  *    Return value of this function, a handle, must be released in order to avoid a resource leak.
  *    Passing it as an argument to the Database constructor is adequate.
  */
-MSIHANDLE get_active_database( Immediate_Session & session )
+msi_handle get_active_database( Immediate_Session & session )
 {
-  MSIHANDLE h = MsiGetActiveDatabase( session.handle ) ;
+  MSIHANDLE h( MsiGetActiveDatabase( session.handle ) ) ;
   if ( h == 0 )
   {
     throw std::runtime_error( "Failed to retrieve active databases" ) ;
   }
-  return h ;
+  return msi_handle( h ) ;
 }
 
 /**
  * \par Implementation Notes
  *    The only thing this constructor needs to do is to initialize the base class.
  */
 Installation_Database::Installation_Database( Immediate_Session & session )
   : Database( get_active_database( session ) )
 {
   // empty body
-}
+} ;
+
+//-----------------------------------------------------------------------------------------
+// View
+//-----------------------------------------------------------------------------------------
+/**
+ * Implementation function for View::first().
+ */
+void view_first_body( UINT x )
+{
+  if ( x != ERROR_SUCCESS )
+  {
+    throw std::runtime_error( "MsiViewExecute call failed" ) ;
+  }
+}
+
+Record View::first()
+{
+  view_first_body( MsiViewExecute( _handle, 0 ) ) ;
+  return next() ;
+}
+
+Record View::first( Record & arguments )
+{
+ view_first_body( MsiViewExecute( _handle, arguments._handle ) ) ;
+ return next() ;
+}
+
+Record View::next()
+{
+  MSIHANDLE h ;
+  UINT x = MsiViewFetch( _handle, & h ) ;
+  if ( x == ERROR_NO_MORE_ITEMS )
+  {
+    return Record( Record::null_t() ) ;
+  }
+  else if ( x == ERROR_SUCCESS )
+  {
+    return Record( msi_handle( h ) ) ;
+  }
+  throw std::runtime_error( "Error fetch record from view" ) ;
+}
+