Help with wcin/ wcout?

[Walter Horvath]

I'm sorry if this was already covered in another post, but for some reason, Dev-C++ doesn't seem to recognise the <iostream> file, or it atleast does so conditionally. In the code below:

============================

include <iostream>

include <string>

include <wchar.h>

include <cstdlib>

using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
std::wstring iobuf;
cout << "Enter a number\n";
getline(wcin,iobuf);
wcout << iobuf << "\n";
int n = _wtol(iobuf.c_str());
cout << "n = " << n << "\n";
return 0;
}

============================

It returns the following errors:

7 C:\Dev-Cpp\main.cpp _TCHAR' has not been declared 8 C:\Dev-Cpp\main.cpp ISO C++ forbids declaration ofargv' with no type
C:\Dev-Cpp\main.cpp In function int _tmain(int, int**)': 11 C:\Dev-Cpp\main.cppwcin' undeclared (first use this function)
12 C:\Dev-Cpp\main.cpp `wcout' undeclared (first use this function)

Do you have to declare wcin/ wcout seperately from <iostream>?

Sorry if this question is simple, redundant or repeated. I'm learning on my own in my spare time and I'm fairly new. Thanks.

[Walter Horvath]

Furthermore, the code below from Microsoft Developer's Network won't even execute correctly:

=========================

// iostream_cerr.cpp
// compile with: /EHsc
// By default, cerr and clog are the same as cout

include <iostream>

include <fstream>

using namespace std;

void TestWide( )
{
int i = 0;
wcout << L"Enter a number: ";
wcin >> i;
wcerr << L"test for wcerr" << endl;
wclog << L"test for wclog" << endl;
}

int main( )
{
int i = 0;
cout << "Enter a number: ";
cin >> i;
cerr << "test for cerr" << endl;
clog << "test for clog" << endl;
TestWide( );
}

=========================

[cpns]

First always post the "Compile Log" tab text, not the filtered "Compiler" tab text. It contains more complete information, including all your build options.

> 7 C:\Dev-Cpp\main.cpp `_TCHAR' has not been declared

_TCHAR is not defined in any of the headers you included. It is defined in tchar.h http://msdn.microsoft.com/en-us/library/c426s321(VS.80).aspx

> 11 C:\Dev-Cpp\main.cpp wcin' undeclared (first use this function) > 12 C:\Dev-Cpp\main.cppwcout' undeclared (first use this function)

Take a look in the actual header file, I believe you will find that they are defined only when some particular wide-character support macro is defined.

> Furthermore, the code below from Microsoft Developer's
> Network won't even execute correctly:

Give us a clue! Don't make us read your mind - it will render you senseless. ;-) What does it do, and what do you expect it to do? Posting a link to the original source would be useful too! (never mind: http://msdn.microsoft.com/en-us/library/6xwbdak2.aspx ). Since you have already observed that wcin and wcout are not defined, I am struggling to understand how you could have executed it at all, as it would not have compiled.

Clifford

[Stanis Kiadidi]

Hi,Walter.
I'm new to C++ too and I've just started using Dev-C++ 4.9.9.2 Beta(You can download it at this address: http://internap.dl.sourceforge.net/sourceforge/dev-cpp/devcpp-4.9.9.2_setup.exe).
I don't know if you've already gotten the solution to your problem. I used this peace of code to test this beta version and it worked:

include <iostream.h>

int main()
{
cout<<"The Compiler Works";
return 0;
}

Instead of <iostream> use <iostream.h> (http://www.cprogramming.com/compiler.html)

I hope this will help. Don't forget that I used Dev-C++ 4.9.9.2 Beta.

[cpns]

Yo seem to be answering a different question in any case. What has this dot to do with wide character I/O?

[Wayne Keen]

Probably assumed the "w" in front was a typo.

;)

Wayne

[Wayne Keen]

"Instead of <iostream> use <iostream.h> (http://www.cprogramming.com/compiler.html)"

NO! Don't ooffer advice if you are going to be THIS WRONG!

iostream.h has been deprecated (i.e. old and wrong) for 10 years.

Wayne