Per-client codepage detection and handling

example4/help.go

@@ -48,7 +48,7 @@ var helpScreen = go3270.Screen{
 // generator function for it is a stand-alone function and not a method on the
 // session.
 func help(returnTransaction go3270.Tx) go3270.Tx {
-	return func(conn net.Conn, _ go3270.DevInfo, data any) (
+	return func(conn net.Conn, devinfo go3270.DevInfo, data any) (
 		go3270.Tx, any, error) {
 		_, err := go3270.HandleScreen(
 			helpScreen,                  // the screen to display
@@ -58,7 +58,8 @@ func help(returnTransaction go3270.Tx) go3270.Tx {
 			nil,
 			"errormsg", // name of field to put error messages in
 			23, 79,     // cursor coordinates
-			conn)
+			conn,
+			devinfo.Codepage())
 		if err != nil {
 			return nil, nil, err
 		}

example4/login.go

@@ -58,7 +58,7 @@ var loginScreenRules = go3270.Rules{
 
 // login transaction accepts a string value in data if the login screen
 // should be initialized with an error message.
-func (sess *session) login(conn net.Conn, _ go3270.DevInfo,
+func (sess *session) login(conn net.Conn, devinfo go3270.DevInfo,
 	data any) (go3270.Tx, any, error) {
 
 	fieldValues := make(map[string]string)
@@ -81,7 +81,8 @@ func (sess *session) login(conn net.Conn, _ go3270.DevInfo,
 			go3270.AIDClear},
 		loginErr, // name of field to put error messages in
 		4, 16,    // cursor coordinates
-		conn)
+		conn,
+		devinfo.Codepage())
 	if err != nil {
 		return nil, nil, err
 	}
@@ -170,7 +171,7 @@ type newuserData struct {
 	errmsg   string
 }
 
-func (sess *session) newuser(conn net.Conn, _ go3270.DevInfo, data any) (
+func (sess *session) newuser(conn net.Conn, devinfo go3270.DevInfo, data any) (
 	go3270.Tx, any, error) {
 
 	fieldValues := make(map[string]string)
@@ -195,7 +196,8 @@ func (sess *session) newuser(conn net.Conn, _ go3270.DevInfo, data any) (
 		},
 		loginErr, // name of field to put error messages in
 		4, 16,    // cursor coordinates
-		conn)
+		conn,
+		devinfo.Codepage())
 	if err != nil {
 		return nil, nil, err
 	}

example4/mainmenu.go

@@ -79,7 +79,7 @@ type mainmenuData struct {
 
 // mainmenu transaction accepts a mainmenuData struct as the data if the
 // option field or error message should be populated.
-func (sess *session) mainmenu(conn net.Conn, _ go3270.DevInfo, data any) (
+func (sess *session) mainmenu(conn net.Conn, devinfo go3270.DevInfo, data any) (
 	go3270.Tx, any, error) {
 
 	fieldValues := make(map[string]string)
@@ -107,7 +107,8 @@ func (sess *session) mainmenu(conn net.Conn, _ go3270.DevInfo, data any) (
 		},
 		mainmenuError, // name of field to put error messages in
 		1, 13,         // cursor coordinates
-		conn)
+		conn,
+		devinfo.Codepage())
 	if err != nil {
 		return nil, nil, err
 	}
@@ -183,7 +184,7 @@ var exampleScreen = go3270.Screen{
 // exampleFeature is a transaction that will act as a placeholder for real
 // application functionality. It accepts a string in the data which will
 // be displayed on the panel.
-func (sess *session) exampleFeature(conn net.Conn, _ go3270.DevInfo,
+func (sess *session) exampleFeature(conn net.Conn, devinfo go3270.DevInfo,
 	data any) (go3270.Tx, any, error) {
 
 	fieldValues := make(map[string]string)
@@ -210,7 +211,8 @@ func (sess *session) exampleFeature(conn net.Conn, _ go3270.DevInfo,
 		},
 		mainmenuError, // name of field to put error messages in
 		23, 79,        // cursor coordinates
-		conn)
+		conn,
+		devinfo.Codepage())
 	if err != nil {
 		return nil, nil, err
 	}