Set user interface language for current thread

- Bind SetThreadUILanguage, SetThreadPreferredUILanguages and GetThreadUILanguage in c.s.j.p.win32.Kernel32
- test is written

Author: overpathz

contrib/platform/src/com/sun/jna/platform/win32/Kernel32.java

@@ -26,8 +26,7 @@
 import com.sun.jna.LastErrorException;
 import com.sun.jna.Native;
 import com.sun.jna.Pointer;
-import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR;
-import com.sun.jna.platform.win32.WinNT.HANDLE;
+import com.sun.jna.StringArray;
 import com.sun.jna.ptr.IntByReference;
 import com.sun.jna.ptr.PointerByReference;
 import com.sun.jna.win32.StdCallLibrary;
@@ -4387,4 +4386,76 @@ Pointer VirtualAllocEx(HANDLE hProcess, Pointer lpAddress, SIZE_T dwSize,
      * </p>
      */
     boolean VirtualUnlock(Pointer lpAddress, SIZE_T dwSize);
+
+    /**
+     * Sets the user interface language for the current thread.
+     *
+     * <p>
+     * Windows Vista and later: This function cannot clear the thread preferred UI languages list. Your MUI application
+     * should call SetThreadPreferredUILanguages to clear the language list.
+     * </p>
+     * <p>
+     * Windows XP: This function is limited to allowing the operating system to identify and set a value that is safe
+     * to use on the Windows console.
+     * </p>
+     *
+     * @param LangId Language identifier for the user interface language for the thread.
+     *
+     * @return Returns the input language identifier if successful.
+     *         If the input identifier is nonzero, the function returns that value.
+     *         If the language identifier is 0, the function always succeeds and returns
+     *         the identifier of the language that best supports the Windows console.
+     *
+     * <p>
+     * When a thread is created, the thread user interface language setting is empty and the user interface for
+     * the thread is displayed in the user-selected language. This function enables the application to change
+     * the user interface language for the current running thread.
+     * </p>
+     * <p>
+     * Windows Vista and later: Calling this function and specifying 0 for the language identifier is identical
+     * to calling SetThreadPreferredUILanguages with the MUI_CONSOLE_FILTER flag set. If the application specifies
+     * a valid nonzero language identifier, the function sets a particular user interface language for the thread.
+     * </p>
+     *
+     * @see <a href="https://learn.microsoft.com/en-us/windows/win32/api/winnls/nf-winnls-setthreaduilanguage">SetThreadUILanguage</a>
+     */
+    int SetThreadUILanguage(int LangId);
+
+    /**
+     * Sets the thread preferred UI languages for the current thread.
+     * @see <a href="https://learn.microsoft.com/en-us/windows/win32/intl/user-interface-language-management">User Interface Language Management</a>
+     *
+     * @param dwFlags            Flags identifying format and filtering for the languages to set.
+     *
+     * <p>
+     * The following format flags specify the language format to use for the thread preferred UI languages.
+     * The flags are mutually exclusive, and the default is MUI_LANGUAGE_NAME.
+     * </p>
+     * <p>
+     * We recommend that you use MUI_LANGUAGE_NAME instead of MUI_LANGUAGE_ID.
+     * </p>
+     *
+     * @param pwszLanguagesBuffer Pointer to a double null-terminated multi-string buffer that contains an ordered,
+     *                            null-delimited list, in the format specified by dwFlags.
+     * <p>
+     * To clear the thread preferred UI languages list, an application sets this parameter to a null string or an empty
+     * double null-terminated string. If an application clears a language list, it should specify either a format flag
+     * or 0 for the dwFlags parameter.
+     * </p>
+     *
+     * @param pulNumLanguages     Pointer to the number of languages that the function has set in the thread preferred UI languages list.
+     *                            When the application specifies one of the filtering flags, the function must set this parameter to NULL.
+     *
+     * @return Returns TRUE if the function succeeds or FALSE otherwise.
+     */
+    boolean SetThreadPreferredUILanguages(DWORD dwFlags, StringArray pwszLanguagesBuffer, ULONGByReference pulNumLanguages);
+
+    /**
+     * Returns the language identifier of the first user interface language for the current thread.
+     *
+     * @return Returns the identifier for a language explicitly associated with the thread by SetThreadUILanguage or
+     *         SetThreadPreferredUILanguages. Alternatively, if no language has been explicitly associated with the
+     *         current thread, the identifier can indicate a user or system user interface language.
+     */
+    int GetThreadUILanguage();
 }

contrib/platform/src/com/sun/jna/platform/win32/Kernel32Util.java

@@ -36,6 +36,7 @@
 import com.sun.jna.Memory;
 import com.sun.jna.Native;
 import com.sun.jna.Pointer;
+import com.sun.jna.StringArray;
 import com.sun.jna.platform.win32.WinNT.HANDLE;
 import com.sun.jna.platform.win32.WinNT.HANDLEByReference;
 import com.sun.jna.platform.win32.WinNT.HRESULT;
@@ -299,6 +300,31 @@ public static String getLastErrorMessage(int primaryLangId, int sublangId) {
                 .GetLastError(), primaryLangId, sublangId);
     }
 
+    /**
+     * Sets the user interface language for the current thread using primary and sub-language identifiers.
+     *
+     * @param langId Language identifier.
+     *
+     * @return Returns the input language identifier if successful.
+     */
+    public static int setThreadUILanguage(int langId) {
+        return Kernel32.INSTANCE.SetThreadUILanguage(langId);
+    }
+
+    /**
+     * Sets the thread preferred UI languages for the current thread.
+     *
+     * @param languages String array of preferred languages to set.
+     *
+     * @return Returns TRUE if the function succeeds or FALSE otherwise.
+     */
+    public static boolean setThreadPreferredUILanguages(String[] languages) {
+        DWORD dwFlags = new DWORD(0);
+        StringArray pwszLanguagesBuffer = new StringArray(languages);
+        ULONGByReference pulNumLanguages = new ULONGByReference(new ULONG(languages.length));
+        return Kernel32.INSTANCE.SetThreadPreferredUILanguages(dwFlags, pwszLanguagesBuffer, pulNumLanguages);
+    }
+
     /**
      * Return the path designated for temporary files.
      *

contrib/platform/test/com/sun/jna/platform/win32/Kernel32Test.java

@@ -63,6 +63,8 @@
 import com.sun.jna.NativeMappedConverter;
 import com.sun.jna.Platform;
 import com.sun.jna.Pointer;
+import com.sun.jna.StringArray;
+
 import com.sun.jna.platform.win32.BaseTSD.SIZE_T;
 import com.sun.jna.platform.win32.BaseTSD.ULONG_PTR;
 import com.sun.jna.platform.win32.BaseTSD.ULONG_PTRByReference;
@@ -2099,4 +2101,33 @@ public void testVirtualLockUnlock() {
         // Unlocking an unlocked region should fail
         assertFalse(Kernel32.INSTANCE.VirtualUnlock(mem, new SIZE_T(4096)));
     }
+
+    public void testSetThreadUILanguage() {
+        int langId = 0x0409; // English (United States)
+        int result = Kernel32.INSTANCE.SetThreadUILanguage(langId);
+        if (result == 0) {
+            int errorCode = Kernel32.INSTANCE.GetLastError();
+            fail("SetThreadUILanguage failed with error code " + errorCode);
+        }
+        assertEquals(langId, result);
+    }
+
+    public void testSetThreadPreferredUILanguages() {
+        WinDef.DWORD dwFlags = new WinDef.DWORD(0);
+        StringArray pwszLanguagesBuffer = (StringArray) StringArray.NULL;
+        WinDef.ULONGByReference pulNumLanguages = new WinDef.ULONGByReference();
+        boolean result = Kernel32.INSTANCE.SetThreadPreferredUILanguages(dwFlags, pwszLanguagesBuffer, pulNumLanguages);
+        assertTrue(result);
+    }
+
+    public void testGetThreadUILanguage() {
+        int langId = 0x0409; // English (United States)
+        int result = Kernel32.INSTANCE.SetThreadUILanguage(langId);
+        if (result == 0) {
+            int errorCode = Kernel32.INSTANCE.GetLastError();
+            fail("SetThreadUILanguage failed with error code " + errorCode);
+        }
+        int uiLangId = Kernel32.INSTANCE.GetThreadUILanguage();
+        assertEquals(langId, uiLangId);
+    }
 }

contrib/platform/test/com/sun/jna/platform/win32/Kernel32UtilTest.java

@@ -171,6 +171,22 @@ public void testFormatMessageFromErrorCodeWithNonEnglishLocale() {
         }
     }
 
+    public void testSetThreadUILanguage() {
+        int langId = 0x0409; // English (United States)
+        int result = Kernel32Util.setThreadUILanguage(langId);
+        if (result == 0) {
+            int errorCode = Kernel32.INSTANCE.GetLastError();
+            fail("SetThreadUILanguage failed with error code " + errorCode);
+        }
+        assertEquals(langId, result);
+    }
+
+    public void testSetThreadPreferredUILanguages() {
+        String[] languages = {};
+        boolean result = Kernel32Util.setThreadPreferredUILanguages(languages);
+        assertTrue(result);
+    }
+
     public void testGetTempPath() {
         assertTrue(Kernel32Util.getTempPath().length() > 0);
     }