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.
Your applications should use RegisterClassW to cause the WM_CHAR and WM_IME_CHAR messages to retrieve Unicode characters instead of DBCS characters in the wParam parameter.
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