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    <p><code>wchar_t</code> is a c++ defined type, that is 16 bits in Visual Studio, but is 32bits in various gcc compilers. Its always capable of holding a unicode codepoint.</p> <p><code>TCHAR</code> and <code>_TCHAR</code> are not "unicode" characters - theyre meant to be used in code that may be compiled and/or used in Unicode OR Ansi programs:</p> <p><code>_TCHAR</code> is - from its leading underscore - a Microsoft C runtime library "extension" to the c++ standard. <code>_TCHAR</code> will, when <code>_UNICODE</code> is defined, be a 16bit character, when <code>_MBCS</code> is defined, be a multibyte character, and when neither is defined, be a singlebyte character. Use this type if you use MS CRT defined string functions that are prefixed with <code>_t</code>: <code>_tcscpy()</code> for example is the replacement for <code>strcpy()</code>/<code>wcscpy()</code>.</p> <p><code>TCHAR</code> is a defined by the Win32 API. This type is a <code>CHAR</code> when <code>UNICODE</code> is not defined, and a <code>WCHAR</code> when <code>UNICODE</code> is defined (note the lack of an underscore on this type). Windows API functions that take strings likewise expect <code>WCHAR</code> strings in <code>UNICODE</code> builds and <code>CHAR</code> strings in non unicode builds.</p> <p>To summarize:</p> <ul> <li><code>wchar_t</code> is a cross platform c++ defined type that can hold a unicode code point - on compilers other than Microsoft, is frequently 32bits wide.</li> <li><code>_TCHAR</code> is a microsoft defined type that is paired with <code>_tcs*</code> c runtime functions that changes its type based on the definition of <code>_UNICODE</code> and/or <code>_MBCS</code>.</li> <li><code>TCHAR</code> is a Windows API defined type that changes its type based on the definition (or not) of <code>UNICODE</code>.</li> <li><code>WCHAR</code> is the native Windows API type for dealing with unicode strings. When using a GCC toolset to build windows code, this will be 16bits wide where <code>wchar_t</code> might not.</li> </ul> <p>Does that help? I don't know.</p>
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    1. POStarting a new Windows app: Should I use _TCHAR or wchar_t for text?
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    1. USChris Becke
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    1. COIt certainly does. Does using TCHARs with the _tcs* functions break things on MBCS platforms?
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    2. COBreak things? No. As long as you ensure that _UNICODE is defined if UNICODE is and/or _MBCS is defined when UNICODE is not, then the Win32 types and the CRT "test" types will change in unison to be compatible. Win32 does not bother to define an explicit MBCS 'mode' as - their descision was not to treat multibyte from single byte character sets differently.
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