How do I convert a CString to const char* in Unicode MFC applications?

Converting CString to const char* in Unicode MFC Applications

Converting a TCHAR CString to ASCII in a Unicode MFC application requires the usage of the CT2A macro. This macro allows for the conversion of the string to various encodings, including ASCII, UTF8, and others.

Code Example:

To convert a CString to ASCII using the local code page:

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

To convert to UTF8:

<code class="cpp">CString str(_T("Some Unicode goodness"));
CT2A ascii(str, CP_UTF8);
TRACE(_T("UTF8: %S\n"), ascii.m_psz);</code>

To convert to a specific code page, such as Thai (874):

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

Additionally, there is a macro called CA2T for converting from ASCII to Unicode, which can be used in ATL/WTL applications with Visual Studio 2003 or later.

For further details, consult the MSDN documentation on these macros.

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