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

Convert CString to const char* in Unicode MFC Applications

Converting a CString from Unicode (TCHAR) to ASCII (const char*) is essential for interacting with legacy code or external libraries in Unicode MFC applications. Here's how you can achieve this:

Using CT2A Macro

The CT2A macro provides a convenient way to convert a Unicode CString to ASCII. It takes the CString as an argument and an optional second argument to specify the code page. By default, it uses the local code page.

<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);</code>

Additional Use Cases

The CT2A macro can also be employed to convert a Unicode CString to UTF8 or any other Windows code page:

<code class="cpp">// 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>

CA2T Macro and Compatibility

There is also a complementary CA2T macro that converts from ASCII to Unicode. Both the CT2A and CA2T macros can be used in ATL/WTL applications with Visual Studio 2003 or later.

Additional Resources

For more in-depth information on these macros and code page conversion, refer to the Microsoft Developer Network (MSDN).

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