# Invalid byte sequence by pack format 'A' or 'a'

**URL:** <https://www.ruby-forum.com/t/invalid-byte-sequence-by-pack-format-a-or-a/154911>\
**Category:** Development\
**Created:** [December 5, 2008, 4:00am UTC](https://www.ruby-forum.com/t/invalid-byte-sequence-by-pack-format-a-or-a/154911 "2008-12-05T04:00:55Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![Yugui\_SYuki\_S.S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/dec6dc/32.png) [@Yugui\_SYuki\_S.S](https://www.ruby-forum.com/u/Yugui_SYuki_S.S)\
**Post date:** [December 5, 2008, 4:00am UTC](https://www.ruby-forum.com/t/invalid-byte-sequence-by-pack-format-a-or-a/154911/1 "2008-12-05T04:00:55Z")

</div>

Yuguie$B$G$9!#e(B

pack  
formate$B$Ne(B’A’e$B$He(B’a’e$B$,%j%U%!%l%s%9%^%K%e%"%k$N!Ve(BASCIIe$BJ8;zNs!W$H$$$&@bL@e(B  
e$B$KH?$7$FJ8;zNs$rC1$K%P%$%HNs$H$7$F8D?tJ,$@$1\>CHq$7$F$$$^$9!#e(B

str = “\xe3\x81\x82”.force\_encoding(“UTF-8”)  
p str #=\> "e$B$“e(B”  
str = [str].pack(“A”)  
p str #=\> “\xE3”  
p str.encoding #=\> #Encoding:UTF-8

e$B7k2L$H$7$F$3$N$h$&$Ke(Bvalide$B$G$J$$%P%$%HI=8=$,@8@.$5$l$k$3$H$b$"$j$^$9!#$3e(B  
e$B$l$O;EMM$G$7$g$&$+e(B?

e$B9M$(J}$H$7$F$Oe(B  
(1) stre$B$,e(BUS-ASCIIe$B$^$?$Oe(BASCII-8BITe$B$G$J$1$l$PNc30$rH/@8e(B  
(2) e$BLa$jCM$NJ8;zNs$re(BASCII-8BITe$B$K$9$ke(B

e$B$J$I$NA\*Br;h$,$"$jF@$k$H;W$$$^$9!#e(B

---

<div class="post-metadata">

**Author:** ![Yugui\_SYuki\_S.S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/dec6dc/32.png) [@Yugui\_SYuki\_S.S](https://www.ruby-forum.com/u/Yugui_SYuki_S.S)\
**Post date:** [December 8, 2008, 9:55am UTC](https://www.ruby-forum.com/t/invalid-byte-sequence-by-pack-format-a-or-a/154911/2 "2008-12-08T09:55:51Z")

</div>

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

In message “Re: [ruby-dev:37278] invalid byte sequence by pack format  
‘A’ or ‘a’”  
on Fri, 5 Dec 2008 11:52:14 +0900, “Yugui (Yuki S.)”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|pack formate$B$Ne(B’A’e$B$He(B’a’e$B$,%j%U%!%l%s%9%^%K%e%"%k$N!Ve(BASCIIe$BJ8;zNs!W$H$$$&@bL@e(B  
|e$B$KH?$7$FJ8;zNs$rC1$K%P%$%HNs$H$7$F8D?tJ,$@$1\>CHq$7$F$$$^$9!#e(B

|e$B7k2L$H$7$F$3$N$h$&$Ke(Bvalide$B$G$J$$%P%$%HI=8=$,@8@.$5$l$k$3$H$b$"$j$^$9!#$3e(B  
|e$B$l$O;EMM$G$7$g$&$+e(B?

e$BJ,3d$7$F9M$($^$7$g$&!#e(B

- e$B%F%s%W%l!\<%He(BAe$B$de(Bae$B$N%+%&%s%H$O%P%$%H?t$+J8;z?t$+!#e(B

- valide$B$G$J$$%P%$%HNs$r@8@.$9$k$3$H$O0U?^E\*$+e(B

- valide$B$G$J$$%P%$%HNs$K85$N%(%s%3!\<%G%#%s%0$rIU2C$9$k$+!"e(B  
ASCII-8BITe$B$K$9$k$+e(B

e$B$H$$$&$o$1$G!“8=\>u$O0U?^E\*$@$,!“L@$i$+$K2u$l$F$$$k\>l9g$K$Oe(B  
ASCII-8BITe$B$K$9$k$H$$$&%\*%W%7%g%s$O$”$j$($k!”$H$$$&$N$O;d$N7ke(B  
e$BO@$G$9!#e(B

```
                            e$B$^$D$b$He(B e$B$f$-$R$me(B /:|)

```

---

<div class="post-metadata">

**Author:** ![Yugui\_SYuki\_S.S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/dec6dc/32.png) [@Yugui\_SYuki\_S.S](https://www.ruby-forum.com/u/Yugui_SYuki_S.S)\
**Post date:** [December 8, 2008, 12:39pm UTC](https://www.ruby-forum.com/t/invalid-byte-sequence-by-pack-format-a-or-a/154911/3 "2008-12-08T12:39:23Z")

</div>

Yukihiro M. e$B$5$s$O=q$-$^$7$?e(B:

> e$BO@$G$9!#e(B  
> validitye$B$r8!::$7$F7k2L$N%(%s%3!\<%G%#%s%0$,JQ$o$k$H$$$&A\*Br;h$O!"$J$s$@$+e(B  
> e$B0l4S@-$,$J$/$F;H$$$E$i$=$&$G$9!#e(B

e$B$J$i$P!"$=$Ne(B2e$B$D$NA\*Br;h$NCf$G$O%(%s%3!\<%G%#%s%0$rJ]$D$[$&$K$J$j$^$9$,!"e(B  
e$B;d$O\>o$Ke(BASCII-8BITe$B$,NI$$$H;W$C$F$$$^$9!#e(B

valide$B$G$J$$J8;zNs$r@8@.$7F@$k$3$H$,0U?^E_e(B(=e$B%^%k%A%P%$%HJ8;zNs$KBP$7$F$be(B  
e$B%P%$%HC10L$G=hM}$9$k$3$H$,0U?^E_e(B)e$B$@$H$9$k$H!"e(B’a’,  
'A’e$B$O!"ItJ,J8;zNs$rJ#e(B  
e$B\<L$9$ke(Bpacke$B$G$O$J$/!"J8;zNs$N%P%$%HI=8=$rE\>\<L$9$ke(Bpacke$B$J$N$G$O$J$$$G$7$g$&$+!#e(B

---

<div class="post-metadata">

**Author:** ![Yugui\_SYuki\_S.S](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/y/dec6dc/32.png) [@Yugui\_SYuki\_S.S](https://www.ruby-forum.com/u/Yugui_SYuki_S.S)\
**Post date:** [December 8, 2008, 3:23pm UTC](https://www.ruby-forum.com/t/invalid-byte-sequence-by-pack-format-a-or-a/154911/4 "2008-12-08T15:23:06Z")

</div>

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

In message “Re: [ruby-dev:37318] Re: invalid byte sequence by pack  
format ‘A’ or ‘a’”  
on Mon, 8 Dec 2008 20:32:12 +0900, “Yugui (Yuki S.)”  
[removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) writes:

|validitye$B$r8!::$7$F7k2L$N%(%s%3!\<%G%#%s%0$,JQ$o$k$H$$$&A\*Br;h$O!"$J$s$@$+e(B  
|e$B0l4S@-$,$J$/$F;H$$$E$i$=$&$G$9!#e(B

e$B5$;}$A$O$o$+$j$^$9!#e(B

|e$B$J$i$P!"$=$Ne(B2e$B$D$NA_Br;h$NCf$G$O%(%s%3!\<%G%#%s%0$rJ]$D$[$&$K$J$j$^$9$,!"e(B  
|e$B;d$O\>o$Ke(BASCII-8BITe$B$,NI$$$H;W$C$F$$$^$9!#e(B  
|  
|valide$B$G$J$$J8;zNs$r@8@.$7F@$k$3$H$,0U?^E_e(B(=e$B%^%k%A%P%$%HJ8;zNs$KBP$7$F$be(B  
|e$B%P%$%HC10L$G=hM}$9$k$3$H$,0U?^E\*e(B)e$B$@$H$9$k$H!"e(B’a’, 'A’e$B$O!"ItJ,J8;zNs$rJ#e(B  
|e$B\<L$9$ke(Bpacke$B$G$O$J$/!"J8;zNs$N%P%$%HI=8=$rE\>\<L$9$ke(Bpacke$B$J$N$G$O$J$$$G$7$g$&$+!#e(B

e$BM}6~$+$i$O$=$&$J$N$G$9$,!"%(%s%3!\<%G%#%s%0\>pJs$,;D$;$k;~$K;De(B  
e$B$7$F$\*$+$J$$$H!"e(Bunpacke$B$N;~$K85$KLa$i$J$$%1!\<%9$,A}$($^$9!#J#e(B  
e$B?t$N%(%s%3!\<%G%#%s%0$re(Bpacke$B$7$F$7$^$C$?;~$K$O;EJ}$,$J$$$G$9$,!"e(B  
packe$B$7$?J8;zNs$N%(%s%3!\<%G%#%s%0$,C10l$J$i$Pe(Bunpacke$B$G%(%s%3!\<e(B  
e$B%G%#%s%0\>pJs$b4^$a$FLa$C$F$[$7$/$J$$$G$9$+!)e(B

```
                            e$B$^$D$b$He(B e$B$f$-$R$me(B /:|)

```