47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
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Note regarding ENABLE_EXTENDED_FLAGS (2016-05-30)
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There is a complicated interaction between the ENABLE_EXTENDED_FLAGS flag
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and the ENABLE_QUICK_EDIT_MODE and ENABLE_INSERT_MODE flags (presumably for
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backwards compatibility?). I studied the behavior on Windows 7 and Windows
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10, with both the old and new consoles, and I didn't see any differences
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between versions. Here's what I seemed to observe:
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- The console has three flags internally:
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- QuickEdit
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- InsertMode
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- ExtendedFlags
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- SetConsoleMode psuedocode:
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void SetConsoleMode(..., DWORD mode) {
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ExtendedFlags = (mode & (ENABLE_EXTENDED_FLAGS
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| ENABLE_QUICK_EDIT_MODE
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| ENABLE_INSERT_MODE )) != 0;
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if (ExtendedFlags) {
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QuickEdit = (mode & ENABLE_QUICK_EDIT_MODE) != 0;
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InsertMode = (mode & ENABLE_INSERT_MODE) != 0;
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}
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}
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- Setting QuickEdit or InsertMode from the properties dialog GUI does not
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affect the ExtendedFlags setting -- it simply toggles the one flag.
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- GetConsoleMode psuedocode:
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GetConsoleMode(..., DWORD *result) {
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if (ExtendedFlags) {
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*result |= ENABLE_EXTENDED_FLAGS;
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if (QuickEdit) { *result |= ENABLE_QUICK_EDIT_MODE; }
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if (InsertMode) { *result |= ENABLE_INSERT_MODE; }
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}
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}
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Effectively, the ExtendedFlags flags controls whether the other two flags
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are visible/controlled by the user application. If they aren't visible,
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though, there is no way for the user application to make them visible,
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except by overwriting their values! Calling SetConsoleMode with just
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ENABLE_EXTENDED_FLAGS would clear the extended flags we want to read.
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Consequently, if a program temporarily alters the QuickEdit flag (e.g. to
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enable mouse input), it cannot restore the original values of the QuickEdit
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and InsertMode flags, UNLESS every other console program cooperates by
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keeping the ExtendedFlags flag set.
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