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    <p>Just declare use a static string as a default result:</p> <pre><code>TCHAR* GetDirectShowMessageDisplayText( int messageNumber ) { switch( messageNumber ) { // ... default: static TCHAR[] default_value = "This is a default result..."; return default_value; } } </code></pre> <p>You may also declare "default_value" outside of the function.</p> <p>UPDATE:</p> <p>If you want to insert a message number in that string then it won't be thread-safe (if you are using multiple threads). However, the solution for that problem is to use <a href="http://www.boost.org/doc/libs/1_35_0/doc/html/thread/thread_local_storage.html#thread.thread_local_storage.thread_specific_ptr" rel="nofollow noreferrer">thread-specific</a> string. Here is an example using <a href="http://www.boost.org/doc/libs/1_35_0/doc/html/thread.html." rel="nofollow noreferrer">Boost.Thread</a>:</p> <pre><code>#include &lt;cstdio&gt; #include &lt;boost/thread/tss.hpp&gt; #define TCHAR char // This is just because I don't have TCHAR... static void errorMessageCleanup (TCHAR *msg) { delete []msg; } static boost::thread_specific_ptr&lt;TCHAR&gt; errorMsg (errorMessageCleanup); static TCHAR * formatErrorMessage (int number) { static const size_t MSG_MAX_SIZE = 256; if (errorMsg.get () == NULL) errorMsg.reset (new TCHAR [MSG_MAX_SIZE]); snprintf (errorMsg.get (), MSG_MAX_SIZE, "Unexpected notification code (%d)", number); return errorMsg.get (); } int main () { printf ("Message: %s\n", formatErrorMessage (1)); } </code></pre> <p>The only limitation of this solution is that returned string cannot be passed by the client to the other thread.</p>
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    1. POIs it possible to *safely* return a TCHAR* from a function?
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    1. COThanks, I considered that, but I can't insert the messageNumber into the string.
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      1. USJohn MacIntyre
    2. CO@John: Sorry I didn't not notice that you want to put a number in that string. I've updated my answer accordingly.
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