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Asked: 2026-06-05T22:47:16+00:00

Possible Duplicate: Why both UNICODE and _UNICODE? What is the difference between UNICODE and

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Possible Duplicate:
Why both UNICODE and _UNICODE?

What is the difference between UNICODE and _UNICODE?
Do we need to define both if compiling the program to use unicode characters?
Is there a reason we have 2 different identifiers for using unicode characters?

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1 Answer

  1. Editorial Team

    Raymond Chen has an answer:

    The plain versions without the underscore affect the character set the Windows header files treat as default. So if you define UNICODE, then GetWindowText will map to GetWindowTextW instead of GetWindowTextA, for example. Similarly, the TEXT macro will map to L"…" instead of "…".

    The versions with the underscore affect the character set the C runtime header files treat as default. So if you define _UNICODE, then _tcslen will map to wcslen instead of strlen, for example. Similarly, the _TEXT macro will map to L"…" instead of "…".

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