L macro

[George2]

Hello everyone,


I am using Visual Studio 2003 and Windows Console project, I find when using L macro to convert character to wide character, the compiler will report an error that L macro is not defined.

I find it is not defined in either <windows.h> or <TCHAR.h> -- when adding the two header files, the compile error is the same.

Could anyone explain how to use L macro in Visual Studio 2003 and Windows Console project? Which header file is needed?


thanks in advance,
George

[Philip Nicoletti]

1) I don't think there is an "L macro". I think it is merely designates
a wide character or a string literal made up of wide characters.

2) an example:

#include <string>
#include <iostream>

using namespace std;

int main (int argc, char** argv)
{
    wstring w = L"Hello";

    wcout << w << L'\n';

    return 0;
}

[nitin1979]

1) I don't think there is an "L macro". I think it is merely designates
a wide character or a string literal made up of wide characters.

2) an example:

#include <string>
#include <iostream>

using namespace std;

int main (int argc, char** argv)
{
    wstring w = L"Hello";

    wcout << w << L'\n';

    return 0;
}

New term for me wcout and wstring,
Philip brother can you explain it to me what's the importance of using wcout and wstring

[sunnypalsingh]

wcout - The object controls insertions to the standard output as a wide stream.
wstring - A type that describes a specialization of the template class basic_string with elements of type wchar_t.

[George2]

Thanks Philip,


If L is not a macro, what is it?

I find my previous fault is I am compiling a C file (.c) and when I rename the file to .cpp, it could compile.


regards,
George

1) I don't think there is an "L macro". I think it is merely designates
a wide character or a string literal made up of wide characters.

2) an example:

#include <string>
#include <iostream>

using namespace std;

int main (int argc, char** argv)
{
    wstring w = L"Hello";

    wcout << w << L'\n';

    return 0;
}

[MikeAThon]

If L is not a macro, what is it?

It's part of the definition and syntax of the language. It's no different (in principle) from use of "F" at the end of a number to indicate a float, or "0x" at the beginning of a number to indicate a hex number.

Mike

[George2]

Thanks Mike,

It's part of the definition and syntax of the language. It's no different (in principle) from use of "F" at the end of a number to indicate a float, or "0x" at the beginning of a number to indicate a hex number.

Mike

I want to confirm that L can only be used in C++ and can not be used in C?


regards,
George

[exterminator]

I want to confirm that L can only be used in C++ and can not be used in C?

Valid for both!

[George2]

Thanks exterminator,

Valid for both!

I have tried that it works for both. It is my careless fault before.


regards,
George