![]() The wParam parameter of the first contains the character code of the diacritic the wParam parameter of the second contains the character code of the subsequent character key. If the subsequent keystroke generates a character that cannot be combined with a diacritic, the system generates two WM_CHAR messages. The wParam parameter of the WM_CHAR message contains the character code of the letter with the diacritic. Instead, it processes the WM_CHAR message generated by the subsequent keystroke. Although the wParam parameter of the WM_DEADCHAR message contains the character code of the diacritic for the dead key, an application typically ignores the message. ![]() TranslateMessage generates the WM_DEADCHAR message when it processes the WM_KEYDOWN message from a dead key. ![]() The window with the keyboard focus would receive the following sequence of messages: To enter the character consisting of an "o" with a circumflex, a German user would type the circumflex key followed by the "o" key. The circumflex key on a German keyboard is an example of a dead key. ![]() Instead, they are used to add a diacritic to the character produced by the subsequent keystroke. Some non-English keyboards contain character keys that are not expected to produce characters by themselves.
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