GetKeyboardLayoutList function (winuser.h)

Retrieves the input locale identifiers (formerly called keyboard layout handles) corresponding to the current set of input locales in the system. The function copies the identifiers to the specified buffer.

int GetKeyboardLayoutList(
  [in]  int nBuff,
  [out] HKL *lpList
);

[in] nBuff

Type: int

The maximum number of handles that the buffer can hold.

[out] lpList

Type: HKL*

A pointer to the buffer that receives the array of input locale identifiers.

Type: int

If the function succeeds, the return value is the number of input locale identifiers copied to the buffer or, if nBuff is zero, the return value is the size, in array elements, of the buffer needed to receive all current input locale identifiers.

If the function fails, the return value is zero. To get extended error information, call GetLastError.

The input locale identifier is a broader concept than a keyboard layout, since it can also encompass a speech-to-text converter, an Input Method Editor (IME), or any other form of input.

Beginning in Windows 8: The preferred method to retrieve the language associated with the current keyboard layout or input method is a call to Windows.Globalization.Language.CurrentInputMethodLanguageTag. If your app passes language tags from CurrentInputMethodLanguageTag to any National Language Support functions, it must first convert the tags by calling ResolveLocaleName.

Conceptual

GetKeyboardLayout

Keyboard Input

Reference