Call this function to retrieve the password character that is displayed in an edit control when the user enters text.
If you create the edit control with the ES_PASSWORD style, the DLL that supports the control determines the default password character. The manifest or the InitCommonControlsEx method determines which DLL supports the edit control. If user32.dll supports the edit control, the default password character is ASTERISK ('*', U+002A). If comctl32.dll version 6 supports the edit control, the default character is BLACK CIRCLE ('●', U+25CF). For more information about which DLL and version supports the common controls, see Shell and Common Controls Versions.
This method sends the EM_GETPASSWORDCHAR message, which is described in the Windows SDK.