Hi, I'm studying OpenGL Programming in http://nehe.gamedev.net/

I'm in Tutorial #0 right now. (http://nehe.gamedev.net/tutorial/creating_an_opengl_window_(win32)/13001/)

I read the whole page, and coded all source code in my Visual Studio 2015.

I have a problem in all strings.

For example,

MessageBox(NULL, "Release Of DC And RC Failed", "SHUTDOWN ERROR", MB_OK | MB_ICONINFORMATION);

there I have 2 errors in between \" respectively.

I found the solution that include tchar.h header file and modify the code like :

MessageBox(NULL, _T("Release Of DC And RC Failed"), _T("SHUTDOWN ERROR"), MB_OK | MB_ICONINFORMATION);

then, there are no red underline now, but I still have a trouble.

in the code:

Thanks to Everybody! As you guys suggested, I should learn modern OpenGL haha.

Anyway, I solved my problem not modifying the codes, I changed my project property so not using character set in Unicode, but Multibyte. Who must study old OpenGL in some reasons, this would help you guys~

Most Win32 functions that take a string argument actually have two different versions for two different string types - ANSI strings and WIDE strings.

ANSI strings use some sort of multi-byte encoding (or just plain old ASCII) and resolve to char*. WIDE strings use UTF-16 encoding and resolve to wchar_t *.

For example, there is no actual MessageBox function. It's actually a trick that the Windows headers play - when there are ANSI and WIDE versions of a function, the windows headers automatically choose the right function for MessageBox to resolve to, based on your project settings. It looks something like this:

#ifdef _UNICODE

#define MessageBox MessageBoxW

#else

#define MessageBox MessageBoxA

#endif

Usually I just use the ANSI version, unless I have reason to believe I'll translate my project into a language other than English. Working with WIDE strings is more work. :)