Error C2664 Char
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Error C2664 Cannot Convert Argument
up vote 0 down vote favorite I'm looking at using boost::serialization and was trying to use a string helper given on http://www.ocoudert.com which has the interface SerializeCStringHelper(char*& s) : s_(s) {} SerializeCStringHelper(const char*& s) : s_(const_cast
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Error C2664 In Visual C++
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a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up error C2664: cannot convert parameter 1 from 'int' to 'int []' up vote http://stackoverflow.com/questions/17773838/reference-to-a-const-char-error-c2664 0 down vote favorite #include
Studio Languages , Windows Desktop Development > C++ Standards, Extensions, and Interop General discussion 5 Sign in to vote Note: This is a FAQ, not a question being asked. Question I'm trying to compile a https://social.msdn.microsoft.com/Forums/vstudio/en-US/c1b08c0a-a803-41c3-ac8c-84eba3be1ddb/faq-cannot-convert-from-const-char-to-lpctstr?forum=vclanguage piece of code such as: MessageBox("Hello world!"); ... when I compile the project, the compiler http://www.codeproject.com/Questions/665654/CString-to-const-char-type-casting-error yields: error C2664: 'CWnd::MessageBoxW' : cannot convert parameter 1 from 'const char [12]' to 'LPCTSTR' What am I doing wrong? Problem This error message means that you are trying to pass a multi-byte string (const char [12]) to a function which expects a unicode string (LPCTSTR). The LPCTSTR type extends to const TCHAR*, where TCHAR is char when you error c2664 compile for multi-byte and wchar_t for unicode. Since the compiler doesn't accept the char array, we can safely assume that the actual type of TCHAR, in this compilation, is wchar_t. Resolution You will have to do one of two things: Change your project configuration to use multibyte strings. Press ALT+F7 to open the properties, and navigate to Configuration Properties > General. Switch Character Set to "Use Multi-Byte Character Set". Indicate that the string literal, error c2664 cannot in this case "Hello world!" is of a specific encoding. This can be done through either prefixing it with L, such as L"Hello world!", or surrounding it with the generic _T("Hello world!") macro. The latter will expand to the L prefix if you are compiling for unicode (see #1), and nothing (indicating multi-byte) otherwise. Variations Another error message, indicating the same problem, would be: cannot convert parameter 1 from 'const char [12]' to 'LPCWSTR' Where LPCWSTR maps to a wchar_t pointer, regardless of your build configuration. This problem can be resolved primarily by using solution #2, but in some cases also #1. A lot of the Microsoft provided libraries, such as the Platform SDK, have got two variations of each function which takes strings as parameters. In case of a unicode build, the actual functions are postfixed W, such as the MessageBoxW seen above. In case of multi-byte, the function would be MessageBoxA (ASCII). Which of these functions is actually used when you compile your application, depends on the setting described in resolution #1 above. References and recommended reads Support for Unicode Generic-Text Mappings in Tchar.h Unicode and Character Sets Conventions for Function Prototypes Monday, October 23, 2006 2:27 PM Moderator Microsoft is conducting an online survey to understand your opinion of the Msdn Web site. If you choose to participate, the onl
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