Question

The following code is generating warning C6284 when compiled with /analyze on MSVC 2008 : object passed as parameter ‘%s’ when string is required in call to function.

 CString strTmp, str;
 str = L"aaa.txt"
 strTmp.Format (L"File: %s", str);

I’m looking for a nice solution for this that would not require static_cast

Answer 1

Microsoft describes the usage of CString with variable argument functions here:

CString  kindOfFruit = "bananas";
int      howmany = 25;
printf_s( "You have %d %s\n", howmany, (LPCTSTR)kindOfFruit ); 

As an alternative you can also use the method PCXSTR CString::GetString() const; to try to fix the warning:

CString strTmp, str;
str = L"aaa.txt"
strTmp.Format (L"File: %s", str.GetString());