Handling Unicode in an IME-Aware Application
Two issues are involved with the IMM and its handling of Unicode. The first issue is that the Unicode versions of IMM functions retrieve the size of a buffer in bytes instead of 16-bit Unicode characters. The second issue is that the IMM normally retrieves Unicode characters (instead of DBCS characters) in the WM_CHAR and WM_IME_CHAR messages.
Windows supports a Unicode interface for the IMM, in addition to the ANSI interface originally supported.
Build date: 11/16/2013