How to Convert a CString to a const char* in Unicode MFC Applications?

Converting CString to Const char* in Unicode MFC Applications

Problem:

How can I transform a CString, particularly when it contains TCHAR characters, to a const char* representation in a Unicode MFC application?

Solution:

To effectively convert a TCHAR CString to ASCII, you should utilize the CT2A macro. This macro not only allows for ASCII conversion but also enables conversion to UTF8 or other Windows code pages. Here are some examples to demonstrate its usage:

<code class="cpp">// Convert using the local code page
CString str(_T("Hello, world!"));
CT2A ascii(str);
TRACE(_T("ASCII: %S\n"), ascii.m_psz);

// Convert to UTF8
CString str(_T("Some Unicode goodness"));
CT2A ascii(str, CP_UTF8);
TRACE(_T("UTF8: %S\n"), ascii.m_psz);

// Convert to Thai code page
CString str(_T("Some Thai text"));
CT2A ascii(str, 874);
TRACE(_T("Thai: %S\n"), ascii.m_psz);</code>

In addition, there is a macro for converting from ASCII to Unicode (CA2T). You can utilize these macros in ATL/WTL applications provided you have VS2003 or later. More detailed information can be found in the MSDN documentation.

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