• Alexander Zhirov (19/19) Jul 18 2023 I'm trying to redirect unicode in the windows console, but when
• Adam D Ruppe (6/9) Jul 18 2023 If you checked the return value of this call, you'd find it fails
• Alexander Zhirov (3/14) Jul 18 2023 Just found
• Alexander Zhirov (2/3) Jul 18 2023 streams*
• Alexander Zhirov (42/45) Jul 18 2023 The redirection issue has been resolved. Another one has now
• Adam D Ruppe (4/5) Jul 18 2023 How does the cat program know what the encoding of the file is?
• Alexander Zhirov (5/8) Jul 19 2023 Strange. Everything works correctly on the command line. And the

Alexander Zhirov <azhirov1991 gmail.com> writes:

I'm trying to redirect unicode in the windows console, but when 
redirecting, empty files are created. If i do it without 
redirects, then the text is displayed correctly in the console:

```d
import core.sys.windows.windows;
import std.stdio;

void main() {
     wstring str = "Just text...";
     HANDLE h_stderr = GetStdHandle(STD_ERROR_HANDLE);
     HANDLE h_stdout = GetStdHandle(STD_OUTPUT_HANDLE);
     WriteConsoleW(h_stderr, str.ptr, cast(DWORD)str.length, NULL, 
NULL);
     WriteConsoleW(h_stdout, str.ptr, cast(DWORD)str.length, NULL, 
NULL);
}
```

```sh
.\app.exe 1> stdout.txt 2> stderr.txt
```

Adam D Ruppe <destructionator gmail.com> writes:

On Tuesday, 18 July 2023 at 21:31:54 UTC, Alexander Zhirov wrote:
     HANDLE h_stdout = GetStdHandle(STD_OUTPUT_HANDLE);
     WriteConsoleW(h_stderr, str.ptr, cast(DWORD)str.length, 
 NULL, NULL);


If you checked the return value of this call, you'd find it fails 
since WriteConsole only works if the output is, in fact, a 
console.

You need to use WriteFile when it is redirected, which you can 
detect with GetFileType to see if it is a character device or not.

Alexander Zhirov <azhirov1991 gmail.com> writes:

On Tuesday, 18 July 2023 at 22:09:40 UTC, Adam D Ruppe wrote:
 On Tuesday, 18 July 2023 at 21:31:54 UTC, Alexander Zhirov 
 wrote:
     HANDLE h_stdout = GetStdHandle(STD_OUTPUT_HANDLE);
     WriteConsoleW(h_stderr, str.ptr, cast(DWORD)str.length, 
 NULL, NULL);


 If you checked the return value of this call, you'd find it 
 fails since WriteConsole only works if the output is, in fact, 
 a console.

 You need to use WriteFile when it is redirected, which you can 
 detect with GetFileType to see if it is a character device or 
 not.

Just found 
[this](https://stackoverflow.com/questions/45805785/why-cant-i-redirect-outpu
-from-writeconsole) on the net. Hmm... I didn't know that Windows has its own
nuances in working with threads. Thanks for the tip.

Alexander Zhirov <azhirov1991 gmail.com> writes:

On Tuesday, 18 July 2023 at 22:12:17 UTC, Alexander Zhirov wrote:
 with threads

streams*

Alexander Zhirov <azhirov1991 gmail.com> writes:

On Tuesday, 18 July 2023 at 22:09:40 UTC, Adam D Ruppe wrote:
 You need to use WriteFile when it is redirected, which you can 
 detect with GetFileType to see if it is a character device or 
 not.

The redirection issue has been resolved. Another one has now 
emerged. Since I have unicode, I need to write 2 bytes each, 
which is exactly what happens. In this regard, incorrect output 
to the file. How to convert it otherwise? Or does it not depend 
on the output?

```d
import core.sys.windows.windows;
import std.stdio;
import std.utf;

void main() {
     wstring str = "Это тестовый текст";
     HANDLE h_stderr = GetStdHandle(STD_ERROR_HANDLE);
     switch (GetFileType(h_stderr)) {
         case FILE_TYPE_CHAR:
             WriteConsoleW(h_stderr, str.ptr, 
cast(DWORD)str.length, NULL, NULL);
             break;
         case FILE_TYPE_PIPE:
             auto utf_str = str.toUTF8;
             WriteFile(h_stderr, utf_str.ptr, 
cast(DWORD)utf_str.length, NULL, NULL);
             break;
         default:
     }
}
```

output:

```sh
PS C:\dlang\test> dmd.exe .\app.d
PS C:\dlang\test> .\app.exe
Это тестовый текст
PS C:\dlang\test> .\app.exe 2> .\stderr.txt
PS C:\dlang\test> cat .\stderr.txt
.\app.exe : ╨н╤В╨╛ ╤В╨╡╤Б╤В╨╛╨▓╤Л╨╣
╤В╨╡╨║╤Б╤В
строка:1 знак:1
+ .\app.exe 2> .\stderr.txt
+ ~~~~~~~~~~~~~~~~~~~~~~~~~
     + CategoryInfo          : NotSpecified: (╨н╤В╨╛ 
╤В╨╡╤Б╤В╨╛╨▓╤Л╨╣
╤В╨╡╨║╤Б╤В:String) [], RemoteException
     + FullyQualifiedErrorId : NativeCommandError


```

Adam D Ruppe <destructionator gmail.com> writes:

On Tuesday, 18 July 2023 at 23:52:06 UTC, Alexander Zhirov wrote:
 PS C:\dlang\test> cat .\stderr.txt

How does the cat program know what the encoding of the file is?

Try opening it in notepad or something and specifying the 
encoding. I betcha it is perfectly fine.

Alexander Zhirov <azhirov1991 gmail.com> writes:

On Wednesday, 19 July 2023 at 00:13:04 UTC, Adam D Ruppe wrote:
 How does the cat program know what the encoding of the file is?

 Try opening it in notepad or something and specifying the 
 encoding. I betcha it is perfectly fine.

Strange. Everything works correctly on the command line. And the 
file redirection works and `2>&1` works. But in PowerShell it 
gives errors. Moreover, PowerShell reacts to `FILE_TYPE_PIPE`, 
and CMD reacts to `FILE_TYPE_DISK`.