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Why Cout() and Cerr() work so different? [message #44969]

Tue, 04 August 2015 23:43

kov_serg
Messages: 37
Registered: August 2008
Location: Russia

Member

Why this code outputs different lines of text? (OS:WinXP SP3 32bit Upp:8760)

#include <Core/Core.h>

using namespace Upp;

CONSOLE_APP_MAIN 
{
	Cout()<<"ABCD - АБВГД\n";
	Cerr()<<"ABCD - АБВГД\n";
}

Output:

ABCD - АБВГД
ABCD - ╨Р╨С╨Т╨У╨Ф

Attachment: pic001.PNG
(Size: 36.38KB, Downloaded 627 times)

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Re: Why Cout() and Cerr() work so different? [message #44970 is a reply to message #44969]

Wed, 05 August 2015 08:08

sergeynikitin
Messages: 748
Registered: January 2008
Location: Moscow, Russia

Contributor

Under Linux

ABCD - АБВГД
ABCD - АБВГД

SergeyNikitin<U++>( linux, wine )
{
under( Ubuntu || Debian || Raspbian );
}

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Re: Why Cout() and Cerr() work so different? [message #44971 is a reply to message #44970]

Wed, 05 August 2015 08:12

sergeynikitin
Messages: 748
Registered: January 2008
Location: Moscow, Russia

Contributor

Win exe under wine

ABCD - ╨Р╨С╨Т╨У╨Ф
ABCD - ╨Р╨С╨Т╨У╨Ф
<--- Finished, press any key to close the window --->

SergeyNikitin<U++>( linux, wine )
{
under( Ubuntu || Debian || Raspbian );
}

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Re: Why Cout() and Cerr() work so different? [message #44973 is a reply to message #44969]

Wed, 05 August 2015 13:05

mirek
Messages: 14050
Registered: November 2005

Ultimate Member

kov_serg wrote on Tue, 04 August 2015 23:43

Why this code outputs different lines of text? (OS:WinXP SP3 32bit Upp:8760)
#include <Core/Core.h>

using namespace Upp;

CONSOLE_APP_MAIN 
{
	Cout()<<"ABCD - АБВГД\n";
	Cerr()<<"ABCD - АБВГД\n";
}
Output:
ABCD - АБВГД
ABCD - ╨Р╨С╨Т╨У╨Ф

It is because different code is used for Cerr output. Cout performs character set conversion (UTF8->console OEM charset), Cerr does not.

The reason is that conversion has some bad properties and it was deemed unlikely that somebody outputs unicode to error output. We might have been wrong... Smile

Mirek

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Re: Why Cout() and Cerr() work so different? [message #44974 is a reply to message #44973]

Wed, 05 August 2015 13:40

kov_serg
Messages: 37
Registered: August 2008
Location: Russia

Member

Cerr() outputs error message with directory name. It works fine until directory has russian name.
I just not understand why behaviour is different. Should it be same? May be it should be fixed.

ps: Under ubuntu it works fine becase terminal has utf-8 encoding.

#include <Core/Core.h>

using namespace Upp;

CONSOLE_APP_MAIN
{
	CoutUTF8(); // this forces behaviour to be same
	String fn="C:\\АБВ\\list.txt";
	Cout()<<"loading "<<fn<<"\n";
	Cerr()<<"problem "<<fn<<"\n";
}

[Updated on: Wed, 05 August 2015 13:52]

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Re: Why Cout() and Cerr() work so different? [message #44975 is a reply to message #44974]

Wed, 05 August 2015 14:05

kov_serg
Messages: 37
Registered: August 2008
Location: Russia

Member

But this does not help. It becames even worse.

index.php?t=getfile&id=4825&private=0

Attachment: pic002.PNG
(Size: 45.88KB, Downloaded 556 times)

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Re: Why Cout() and Cerr() work so different? [message #44996 is a reply to message #44969]

Wed, 12 August 2015 12:18

Mindtraveller
Messages: 917
Registered: August 2007
Location: Russia, Moscow rgn.

Experienced Contributor

I guess charset conversion fot Cout/Cerr could be a bad kind of surprise. This is something you don't wait for when use it.

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Re: Why Cout() and Cerr() work so different? [message #45023 is a reply to message #44996]

Thu, 20 August 2015 08:20

mirek
Messages: 14050
Registered: November 2005

Ultimate Member

To tell the truth, all is also complicated by the fact that in win32, we present itself to system as "non-UNICODE" application (because of now obsolete demand to support Win95/Win98). That means the console runs in OEM charset... So the conversion is UTF8->OEM charset Sad

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