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{ loginScreen.Visibility = Visibility.Visible; mainCanvas.Visibility = Visibility.Collapsed; } Since the authentication cookie might be valid when a user first visits the application, your application should call ValidateUser and react accordingly (such as displaying a message that the user is logged in; similar to how web sites display it). If you don t want to (or can t) use the ASP.NET authentication service, the ASP.NET authentication service serves as a good model for an authentication service you could implement. Using the RoleService Once a user is authenticated and logged in, the RoleService is used to obtain the roles the user belongs to and to check whether he belongs to a specified role as part of the authorization process. Let s take a look at the methods the RoleService provides: GetRolesForCurrentUser: Returns an array of strings containing the roles the currently authenticated user belongs to IsCurrentUserInRole: Takes a role name and returns true if the user is a member of the role Once the user is authenticated and logged in, you can retrieve the list of roles the user is in using the GetRolesForCurrentUser method. If your application will make a number of rolebased decisions, it s better to cache this list of roles locally instead of repeatedly calling the IsCurrentUserInRole service method. Again, we create an instance of the RoleService client and register the GetRolesForCurrentUser event handler: roleClient = new RoleServiceClient(); roleClient.GetRolesForCurrentUserCompleted += new EventHandler<GetRolesForCurrentUserCompletedEventArgs> (roleClient_GetRolesForCurrentUserCompleted); One opportunity to cache the user s roles occurs when the user successfully logs in although you might want to delay this, since it adds to the amount of time it takes to log the user in. You d also have to handle loading roles for when the user is already logged in: roleClient.GetRolesForCurrentUserAsync();

The find operator (=~) returns a java.util.regex.Matcher.26 A matcher is a component that applies a regular expression to a string. The result is a two-dimensional array of matches. The first dimension contains the match, and the second dimension contains the groups within the match. A group is the defined within the regular expression using parentheses. In the example in Listing 2-31, the regular expression defines four groups. When the expression is applied to a string, the groups are individually accessible. This is useful for identifying and accessing portions of a string.

## Load functions and set programwide variables ## Endless loop (exit from within get_form) ## Initialize transaction record ## Display record and get user entry

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Once the callback for this web service method occurs, the roles are cached in a List<string>: private List<string> cachedRoles; private void roleClient_GetRolesForCurrentUserCompleted(object sender, GetRolesForCurrentUserCompletedEventArgs e) { cachedRoles = new List<string>(); foreach (string role in e.Result) { cachedRoles.Add(role); } } public bool isUserInRole(string role) { return(cachedRoles.Contains(role)); } The application can now use the isUserInRole method, instead of the RoleService directly, to make role-based decisions.

01 02 03 04 05 06 07 08 def winpath=/C:\windows\system32\somedir/ def matcher = winpath =~ /(\w{1}):\\(\w+)\\(\w+)\\(\w+)/ println matcher println matcher[0] // ["C:\windows\system32\somedir", "C", "windows", // "system32", "somedir"] println matcher[0][1] // C def newPath = matcher.replaceFirst('/etc/bin/') println newPath // /etc/bin

The current transaction is printed by tr_form. The fixed fields are printed at the top, on the second line (defined by the line variable), and each changeable field is printed on its own line. These are double spaced, the spacing being governed by the value of $linespace. tr_form() { line=2 linespace=2 printat $line 1 ## Use_show_date from standard-funcs ( 1) _show_date "$e_date" printf " TR#: $B%s$UB Entry Date: $B%s$UB$cle" "$tr_num" "$_SHOW_DATE" _show_date "${tr_date:=$DATE}" tr_field Date 1 "$_SHOW_DATE" [ -n "$acct" ] && lookup "$acct" "$GLDIR/accounts" && acct_name=$_LOOKUP tr_field Account 2 "$acct${acct_name:+ - $acct_name}"

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