Powershell使用scanf进行编程的管道

Question

Recently I moved from Windows' cmd.exe to PowerShell. Later on I discovered that Microsoft decided to abandon standard stdin redirection method abc.exe < input.txt and recommends using Get-Content input.txt | .\\abc.exe Get-Content input.txt | .\\abc.exe .

Unfortunately new method crashed my app. I created this simple program to find the source of the problem

#include <cstdio>

int main() {
    int x = -1;
    scanf("%d", &x);
    printf("%d", x);

    return 0;
}

and discovered that this test program returns -1 instead of number inside input.txt.

I also tested commands like echo 1 | .\\abc.exe echo 1 | .\\abc.exe and type input.txt | .\\abc.exe type input.txt | .\\abc.exe and all of them print -1 to stdout.

I would be grateful for any help.

Edit 1:

Result of $OutputEncoding command:

IsSingleByte      : True                                  
BodyName          : us-ascii                              
EncodingName      : US-ASCII                              
HeaderName        : us-ascii                              
WebName           : us-ascii                              
WindowsCodePage   : 1252                                  
IsBrowserDisplay  : False                                 
IsBrowserSave     : False                                 
IsMailNewsDisplay : True                                  
IsMailNewsSave    : True                                  
EncoderFallback   : System.Text.EncoderReplacementFallback
DecoderFallback   : System.Text.DecoderReplacementFallback
IsReadOnly        : True                                  
CodePage          : 20127

Edit 2:

I created this simple program to see what is piped to program:

#include <cstdio>

int main() {

    char l;
    while(scanf("%c", &l)) {
        printf("%d\n", l);
    }

    return 0;
}

After running Get-Content input.txt | .\\abc.exe Get-Content input.txt | .\\abc.exe it keeps printing 10 which corresponds to ASCII "line feed" character.

Answer 1

Apparently PowerShell has multiple places where encoding needs to be set before everything starts to work fine.

Finally I came up with this solution - add lines that are below this text to your PS profile file:

[Console]::InputEncoding = [System.Text.Encoding]::UTF8
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
chcp 1250 // Change here for preferable Windows Code Page. 1250 is Central Europe
$OutputEncoding = [Console]::OutputEncoding
Clear-Host // clear screen because chcp prints text "Active code page: (code page)"

After including these lines Get-Content started to behave correctly.