---
name: "XtSetLanguageProc"
section: "3x"
platform: "linux"
package: "libxt-dev"
version: "4.3.0.dfsg.1-14sarge7"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/XtSetLanguageProc/3x"
---

# XtSetLanguageProc(3x)

set the language procedure

## NAME

XtSetLanguageProc - set the language procedure

## SYNTAX

Widget XtSetLanguageProc(XtAppContext *app\_context*, XtLanguageProc *proc*, XtPointer *client\_data*);

## ARGUMENTS

- *app\_context*

  Specifies the application context in which the language procedure is to be used, or NULL.

- *proc*

  Specifies the language procedure, or NULL.

- *client\_data*

  Specifes addional client data to be passed to the language procedure when it is called.

## DESCRIPTION

*XtSetLanguageProc* sets the language procedure that will be called from *XtDisplayInitialize* for all subsequent Displays initialized in the specified application context. If *app\_context* is NULL, the specified language procedure is registered in all application contexts created by the calling process, including any future application contexts that may be created. If  *proc* is NULL a default language procedure is registered. *XtSetLanguageProc* returns the previously registered language procedure. If a language procedure has not yet been registered, the return value is unspecified but if this return value is used in a subsequent call to *XtSetLanguageProc*, it will because the default language procedure to be registered.

The default language procedure does the following:

- •

  Sets the locale according to the environment. On ANSI C-based systems this is done by calling *setlocale*( *LC\_ALL*, language ). If an error is encountered a warning message is issued with *XtWarning*.

- •

  Calls *XSupportsLocale* to verify that the current locale is supported. If the locale is not supported, a warning message is issued with *XtWarning* and the locale is set to \`\`C''.

- •

  Calls *XSetLocaleModifiers* specifying the empty string.

- •

  Returns the value of the current locale. On ANSI C-based systems this is the return value from a final call to *setlocal*( *LC\_ALL*, NULL ).

A client wishing to use this mechanism to establish locale can do so by calling *XtSetLanguageProc* prior to  *XtDisplayInitialize.*

## SEE ALSO

*X Toolkit Intrinsics - C Language Interface*\
 *Xlib - C Language X Interface*