# IncompatibleEncodingError

**URL:** <https://www.ruby-forum.com/t/incompatibleencodingerror/141089>\
**Category:** Development\
**Created:** [June 21, 2008, 11:16pm UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089 "2008-06-21T23:16:14Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 21, 2008, 11:16pm UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/1 "2008-06-21T23:16:14Z")

</div>

e$B?\F#$G$9!#e(B

Ruby 1.9e$B$G$O$?$/$5$s$Ne(B"incompatible encodings: …“e$B$H$$$&Nce(B  
e$B30$rL$K$9$k$H;W$&$N$G$9$,!”$=$NNc30%/%i%9$re(BArgumentErrore$B$+e(B  
e$B$ie(BIncompatibleEncodingErrore$B$H$$$&$h$&$J@lMQ$NNc30%/%i%9$K$9e(B  
e$B$k$H$$$&$N$O$I$&$G$7$g$&$+!)e(B

“incompatible encodings: …“e$B$J%(%i!\<$rNc30$rJa$^$($d$9$/$9e(B  
e$B$k$H!”%(%s%3!\<%G%#%s%0$r@\_Dj$7D\>$7$F:F%A%c%l%s%8$9$k$H$+!”?Fe(B  
e$B@Z$J%(%i!\<%a%C%;!\<%8$r=PNO$9$k$H$$$&$h$&$J$3$H$,$7$d$9$/$J$ke(B  
e$B$H;W$$$^$9!#e(B

def parse(input)  
begin  
MyParser.new(input).parse  
rescue IncompatibleEncodingError  
puts “input encoding must be #{$!.expected\_encoding}”  
puts “but was #{$!.actual\_encoding}”  
nil  
end  
end

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 22, 2008, 9:43am UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/2 "2008-06-22T09:43:34Z")

</div>

e$B@.@%$G$9!#e(B

Kouhei S. wrote:

> def parse(input)  
> begin  
> MyParser.new(input).parse  
> rescue IncompatibleEncodingError  
> puts “input encoding must be #{$!.expected\_encoding}”  
> puts “but was #{$!.actual\_encoding}”  
> nil  
> end  
> end

e$B$?$7$+$K$=$l$O$$$$$+$b$7$l$^$;$s!#e(B

e$BLB$&$H$3$m$,!"e(B

- IncompatibleEncodingError e$B$K$9$k$+!"e(BEncodingError  
e$B$H0lCJ9-$/\<h$C$F$\*$/$+e(B
- e$B%9!\<%Q!\<%/%i%9$re(B ArgumentError e$B$K$9$k$+e(B  
e$B$"$?$j$G$7$g$&$+!#e(B

e$B$J$\*!"8=:\_e(B incompatible encoding e$B$de(B differ e$B$Ne(B  
ArgumentError e$B$,Ej$2$i$l$k\>l9g!"e(B  
e$B4|BT$5$l$k%(%s%3!\<%G%#%s%0$,$J$$\>l9g$bB?$$$N$G$O$J$$$+$H;W$$$^$9!#e(B

e$B4pK\E\*$K$Oe(B receiver e$B$N%(%s%3!\<%G%#%s%0$He(B argument  
e$B$N%(%s%3!\<%G%#%s%0$,e(B  
e$B0[$J$k$H$+$G$7$g$&$M!#e(B

# e$B$D$^$j!"e(Breceriver e$B$He(B argumente$B$,$H$l$k$Y$-$+$J$!!#e(B

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 23, 2008, 1:19pm UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/3 "2008-06-23T13:19:28Z")

</div>

e$B?\F#$G$9!#e(B

In [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
“[ruby-dev:35201] Re: IncompatibleEncodingError” on Sun, 22 Jun 2008  
16:41:16 +0900,  
“NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> > Ruby 1.9e$B$G$O$?$/$5$s$Ne(B"incompatible encodings: …“e$B$H$$$&Nce(B  
> > e$B30$rL$K$9$k$H;W$&$N$G$9$,!”$=$NNc30%/%i%9$re(BArgumentErrore$B$+e(B  
> > e$B$ie(BIncompatibleEncodingErrore$B$H$$$&$h$&$J@lMQ$NNc30%/%i%9$K$9e(B  
> > e$B$k$H$$$&$N$O$I$&$G$7$g$&$+!)e(B

> e$BLB$&$H$3$m$,!"e(B
> 
> - IncompatibleEncodingError e$B$K$9$k$+!"e(BEncodingError e$B$H0lCJ9-$/\<h$C$F$\*$/$+e(B
> - e$B%9!\<%Q!\<%/%i%9$re(B ArgumentError e$B$K$9$k$+e(B  
> e$B$"$?$j$G$7$g$&$+!#e(B

EncodingErrore$B$N2\<$Ke(BIncompatibleEncodingErrore$B$,$h$$$H;W$$$^$9!#e(B  
e$B$H$$$&$N$b!"e(B

> e$B$J$\*!"8=:\_e(B incompatible encoding e$B$de(B differ e$B$Ne(B ArgumentError e$B$,Ej$2$i$l$k\>l9g!"e(B  
> e$B4|BT$5$l$k%(%s%3!\<%G%#%s%0$,$J$$\>l9g$bB?$$$N$G$O$J$$$+$H;W$$$^$9!#e(B

e$B$H$$$&;~$O!“e(BIncompatibleEncodingErrore$B$8$c$J$$$b$C$H$=$l$C$]e(B  
e$B$$Nc30$,$-$?J}$,4r$7$=$&$@$+$i$G$9!#$=$7$F!”%(%s%3!\<%G%#%s%0e(B  
e$B4X78$NNc30$r$^$H$a$FJa$^$($?$$$H$-$N$?$a$Ke(BEncodingErrore$B$,?Fe(B  
e$B$K$J$C$F$$$k$HJXMx$=$&$@$+$i$G$9!#e(B

e$B%9!\<%Q!\<%/%i%9$Oe(BArgumentErrore$B$8$c$J$/$F$b$h$$5$$,$7$^$9!#e(B  
e$B!J8\_49@-$r5$$K$7$J$$$J$i!Ke(B

e$BNc$($P!"$3$&$$$&$H$-$Oe(BArgumentErrore$B$O$J$s$+0c$&$h$&$J5$$,$9e(B  
e$B$k$+$i$G$9!#e(B

# coding: utf-8

“e$B$”$\*$$$($\*e(B".sub(/e$B$$e(B/) {“e$B$+e(B”.encode(“eucJP”)}

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 23, 2008, 6:34pm UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/4 "2008-06-23T18:34:57Z")

</div>

e$B@.@%$G$9!#e(B

Kouhei S. wrote:

> EncodingErrore$B$N2\<$Ke(BIncompatibleEncodingErrore$B$,$h$$$H;W$$$^$9!#e(B  
> e$B$H$$$&$N$b!"e(B
> 
> > e$B$J$\*!"8=:\_e(B incompatible encoding e$B$de(B differ e$B$Ne(B ArgumentError e$B$,Ej$2$i$l$k\>l9g!"e(B  
> > e$B4|BT$5$l$k%(%s%3!\<%G%#%s%0$,$J$$\>l9g$bB?$$$N$G$O$J$$$+$H;W$$$^$9!#e(B
> 
> e$B$H$$$&;~$O!“e(BIncompatibleEncodingErrore$B$8$c$J$$$b$C$H$=$l$C$]e(B  
> e$B$$Nc30$,$-$?J}$,4r$7$=$&$@$+$i$G$9!#$=$7$F!”%(%s%3!\<%G%#%s%0e(B  
> e$B4X78$NNc30$r$^$H$a$FJa$^$($?$$$H$-$N$?$a$Ke(BEncodingErrore$B$,?Fe(B  
> e$B$K$J$C$F$$$k$HJXMx$=$&$@$+$i$G$9!#e(B

IRC e$B$G$bOC$7$?7k2L!"e(B

Encoding::IncompatibleError \< StandardError

e$B$r?7@\_$H$$$&$N$,:#$N$H$3$m:G1&Mc$K$J$C$F$$$^$9!#e(B  
Encoding e$B$H$+e(B Error e$B$H$+2?EY$b=q$+$J$/$F$$$$$7!#e(B

e$B$3$s$J46$8$G$I$&$G$7$g$&!#e(B

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 23, 2008, 6:41pm UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/5 "2008-06-23T18:41:24Z")

</div>

e$B$^$D$b$He(B e$B$f$-$R$m$G$9e(B

In message “Re: [ruby-dev:35210] Re: IncompatibleEncodingError”  
on Tue, 24 Jun 2008 01:31:50 +0900, “NARUSE, Yui”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|Encoding::IncompatibleError \< StandardError  
|  
|e$B$r?7@\_$H$$$&$N$,:#$N$H$3$m:G1&Mc$K$J$C$F$$$^$9!#e(B  
|Encoding e$B$H$+e(B Error e$B$H$+2?EY$b=q$+$J$/$F$$$$$7!#e(B  
|  
|e$B$3$s$J46$8$G$I$&$G$7$g$&!#e(B

e$B$&!\<$s!“$^$”!"$$$$$s$8$c$J$$$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 24, 2008, 2:10pm UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/6 "2008-06-24T14:10:07Z")

</div>

At Tue, 24 Jun 2008 01:38:47 +0900,  
matz wrote:

> うーん、まあ、いいんじゃないでしょうか。  
> 　ほかに Encoding é–¢ä¿‚ã®ã‚¨ãƒ©ãƒ¼ã‚’è¿½åŠ ã™ã‚‹ã¨ãã‚‚ StandardError の  
> 直下にぶらさげるんでしょうか。

　IncompatibleEncodingError ってのは Encoding 関係で複数の例外を  
区別する必要が生じてからでよいので、とりあえず

class EncodingError \< StandardError; end

だけ導入するのはどうでしょうか。

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 25, 2008, 3:50am UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/7 "2008-06-25T03:50:38Z")

</div>

At 21:07 08/06/24, Akinori MUSHA wrote:

> At Tue, 24 Jun 2008 01:38:47 +0900,  
> matz wrote:
> 
> > In message “Re: [ruby-dev:35210] Re: IncompatibleEncodingError”  
> > on Tue, 24 Jun 2008 01:31:50 +0900, “NARUSE, Yui” [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> > writes:
> > 
> > |Encoding::IncompatibleError \< StandardError

> e$B!!$[$+$Ke(B Encoding e$B4X78$N%(%i!\<$rDI2C$9$k$H$-$be(B StandardError e$B$Ne(B  
> e$BD\>2\<$K$V$i$5$2$k$s$G$7$g$&$+!#e(B
> 
> e$B!!e(BIncompatibleEncodingError e$B$C$F$N$Oe(B Encoding e$B4X78$GJ#?t$NNc30$re(B  
> e$B6hJL$9$kI,MW$,@8$8$F$+$i$G$h$$$N$G!“$H$j$”$($:e(B
> 
> class EncodingError \< StandardError; end
> 
> e$B$@$1F3F~$9$k$N$O$I$&$G$7$g$&$+!#e(B

Encoding e$B$He(B transcode e$B$r0l=o$K$7$?J}$,$$$$$H9M$($k$H!"e(B  
e$B8=:\_0lHLE\*$JNc30$K$J$C$F$$$ke(B transcode.c e$BFb$N0lIt$N$H$3$m$be(B  
Encoding:: e$B2\<$KF~$l$k$3$H$,9M$($i$l$k!#e(B

e$B8=:\_$Ne(B transcode.c e$BFb$Ne(B rb\_raise  
e$B$rJ,@O$7$^$9$H\<!$NDL$j$K$J$j$^$9e(B:

```
    rb_raise(rb_eArgError, "transcoder from %s to %s has been 

```

already registered",  
e$BFbIt%(%i!\<$\_$?$$$J$b$N$G!"\<oN`$O$=$l$[$I5$$K$7$J$/$F$$$$!#e(B

```
    rb_raise(rb_eArgError, "invalid library name - %s",

```

e$BFbIt%(%i!\<$\_$?$$$J$b$N$G!"\<oN`$O$=$l$[$I5$$K$7$J$/$F$$$$!#e(B

```
    rb_raise(rb_eRuntimeError /*@@@change exception*/, "conversion 

```

undefined for byte sequence (maybe invalid byte sequence)“);  
e$BJQ49$,L$Dj5A$G!”$3$3$Oe(B Encoding::UndefinedCharacterError  
e$B$H$+=P$O$I$&$G$7$g$&$+!#e(B  
e$BE57?Nc$Oe(B UTF-8 e$B$+$iNc$($Pe(B EUC-JP e$B$X$NJQ49$G!"e(BEUC-JP  
e$B$GI=8=$G$-$J$$J8;z$N\>l9g!#e(B

```
    rb_raise(rb_eArgError, "unknown value for invalid: setting");

```

e$B85$N%G!\<%?$KLdBj$,$“$k$H$$$&$3$H$G!”$3$l$OB\>$N$H$3$m$GF1$8%(%i!\<$,=P$k$He(B  
e$B0l=o$K$7$?$$$H;W$$$^$9!#E57?Nc$Oe(B UTF-8 e$B$Ge(B UTF-8  
e$B=P$J$$%P%$%HNs$J$I!#e(B

```
    rb_raise(rb_eArgError, "wrong number of arguments (%d for 

```

1…2)", argc);  
e$B$3$l$Oe(B encode e$B%a%\>%I$KEj$2$?0z?t$N?t$,0c$&$H$$$&$3$H$G!"B?J,e(B  
ArgError e$B$G$$$$$@$m$&!#e(B

```
    rb_raise(rb_eArgError, "transcoding not supported (from %s to 

```

%s)“, from\_e, to\_e);  
e$B$3$l$O3d$j$He(B rescue e$B$9$k$N$,B?$$$N$G$O$J$$$+$H;W$$$^$9e(B  
(e$BNc$($P2?$+FC\<l$Je(B encoding  
e$B$XJQ49$7$F$_$F!"$3$l$,$@$a$G$7$?$iF1$87ONs$N$b$C$H%Y!\<%8%C%/$J$b$N$r$d$C$F$_$k$H$+e(B)  
e$B$J$N$G!”$b$7$+$7$F6hJL$7$F$b$$$$$N$+$J!#e(B

```
    rb_raise(rb_eArgError, "not fully converted, %td bytes left", 

```

sp+slen-fromp);  
e$B$3$l$OJ8;z$,ESCf$G@Z$i$l$F$$$k\>l9g$J$I5/$3$j$^$9$N$G!"e(BEncoding::  
e$B2\<$G$$$$$H;W$$$^$9!#e(B

e$B%"%I%P%$%9$r59$7$/$\*4j$$$7$^$9!#e(B Martin.

#-#-# Martin J. Du"rst, Assoc. Professor, Aoyama Gakuin University  
#-#-# [http://www.sw.it.aoyama.ac.jp](http://www.sw.it.aoyama.ac.jp)[mailto:removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)

---

<div class="post-metadata">

**Author:** ![Kouhei\_S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/k/f4b2a3/32.png) [@Kouhei\_S](https://www.ruby-forum.com/u/Kouhei_S)\
**Post date:** [June 25, 2008, 9:17am UTC](https://www.ruby-forum.com/t/incompatibleencodingerror/141089/8 "2008-06-25T09:17:32Z")

</div>

At Wed, 25 Jun 2008 10:48:06 +0900,  
e$B@.@%$G$9!#e(B

Martin D. wrote:

> > e$B!!$[$+$Ke(B Encoding e$B4X78$N%(%i!\<$rDI2C$9$k$H$-$be(B StandardError e$B$Ne(B  
> > e$B8=:\_0lHLE\*$JNc30$K$J$C$F$$$ke(B transcode.c e$BFb$N0lIt$N$H$3$m$be(B  
> > Encoding:: e$B2\<$KF~$l$k$3$H$,9M$($i$l$k!#e(B

Transcodee$B%/%i%9$,:n$i$l$k$3$H$,$J$$$J$i$P!“0l=o$NJ}$,$$$$$+$b$7$l$^$;$s!#e(B  
e$B:n$i$l$k$3$H$,$b$7$”$k$H!"G:$^$7$$$G$9$M$’!#e(B

> e$B8=:\_$Ne(B transcode.c e$BFb$Ne(B rb\_raise e$B$rJ,@O$7$^$9$H\<!$NDL$j$K$J$j$^$9e(B:
> 
> ```
> rb_raise(rb_eArgError, "transcoder from %s to %s has been already registered",
> 
> ```
> 
> e$BFbIt%(%i!\<$\_$?$$$J$b$N$G!"\<oN`$O$=$l$[$I5$$K$7$J$/$F$$$$!#e(B
> 
> ```
> rb_raise(rb_eArgError, "invalid library name - %s",
> 
> ```
> 
> e$BFbIt%(%i!\<$\_$?$$$J$b$N$G!"\<oN`$O$=$l$[$I5$$K$7$J$/$F$$$$!#e(B

e$BF10U$7$^$9!#e(B  
e$B$`$7$m$3$l$i$Oe(B rb\_bug e$B$H$+$NJ}$,$$$$$N$+$b!#e(B

> ```
> rb_raise(rb_eRuntimeError /*@@@change exception*/, "conversion undefined for byte sequence (maybe invalid byte sequence)");
> 
> ```
> 
> e$BJQ49$,L$Dj5A$G!"$3$3$Oe(B Encoding::UndefinedCharacterError e$B$H$+=P$O$I$&$G$7$g$&$+!#e(B  
> e$BE57?Nc$Oe(B UTF-8 e$B$+$iNc$($Pe(B EUC-JP e$B$X$NJQ49$G!"e(BEUC-JP e$B$GI=8=$G$-$J$$J8;z$N\>l9g!#e(B

UndefinedCharacterError e$B$G$7$g$&$Me(B  
e$B%(%i!\<%a%C%;!\<%8$Oe(B  
"conversion undefined in for byte sequence in "  
e$B$H$$$&$h$&$K!"e(Bfrom encoding e$B$He(B to encoding  
e$B$,J,$+$C$?J}$,$$$$$+$b$7$l$^$;$s!#e(B

> ```
> rb_raise(rb_eArgError, "unknown value for invalid: setting");
> 
> ```
> 
> e$B85$N%G!\<%?$KLdBj$,$"$k$H$$$&$3$H$G!"$3$l$OB\>$N$H$3$m$GF1$8%(%i!\<$,=P$k$He(B  
> e$B0l=o$K$7$?$$$H;W$$$^$9!#E57?Nc$Oe(B UTF-8 e$B$Ge(B UTF-8 e$B=P$J$$%P%$%HNs$J$I!#e(B

e$B$3$N%(%i!\<$C$F!"e(BString#encode(enc, invalid: value) e$B$Ne(B value  
e$B$,IT@5$J\>l9g$Ne(B  
e$B%(%i!\<$8$c$J$$$G$9$+$M!#e(B

e$B$5$F$\*$-!"2\<$N%G!\<%?$KLdBj$,$k\>l9g$Oe(B  
re.c 1179 e$B9TL$Ne(B “broken string” e$B$d!"e(B  
parse.y e$B$Ne(B “invalid …” e$B$,F1$8\<oN`$G$9$M!#e(B

> ```
> rb_raise(rb_eArgError, "wrong number of arguments (%d for 1..2)", argc);
> 
> ```
> 
> e$B$3$l$Oe(B encode e$B%a%\>%I$KEj$2$?0z?t$N?t$,0c$&$H$$$&$3$H$G!"B?J,e(B ArgError e$B$G$$$$$@$m$&!#e(B

e$B$=$&$G$9$M!#e(B

> ```
> rb_raise(rb_eArgError, "transcoding not supported (from %s to %s)", from_e, to_e);
> 
> ```
> 
> e$B$3$l$O3d$j$He(B rescue e$B$9$k$N$,B?$$$N$G$O$J$$$+$H;W$$$^$9e(B (e$BNc$($P2?$+FC\<l$Je(B encoding  
> e$B$XJQ49$7$F$_$F!"$3$l$,$@$a$G$7$?$iF1$87ONs$N$b$C$H%Y!\<%8%C%/$J$b$N$r$d$C$F$_$k$H$+e(B)  
> e$B$J$N$G!"$b$7$+$7$F6hJL$7$F$b$$$$$N$+$J!#e(B

e$B$G$9$M!"JL$K$7$F$b$$$$$+$b$7$l$^$;$s!#e(B  
UnsupportedConversion ?

> ```
> rb_raise(rb_eArgError, "not fully converted, %td bytes left", sp+slen-fromp);
> 
> ```
> 
> e$B$3$l$OJ8;z$,ESCf$G@Z$i$l$F$$$k\>l9g$J$I5/$3$j$^$9$N$G!"e(BEncoding:: e$B2\<$G$$$$$H;W$$$^$9!#e(B

e$B$&!\<$s!"$I$&$G$7$g$&!#e(B  
e$B%(%i!\<$N$=$b$=$b$N860x$O3N$+$K0z?t$G$"$ke(BStringe$B$,IT40A4$@$+$i$J$N$G$9$,!"e(B  
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