Write a line

Gluck · 16th April 2018, 09:21

I want write a line of text (in portable mode) in hosts file...

What have I to write?

Thanks

Anders · 16th April 2018, 12:45

Have you tried searching the forum and wiki?

Portable applications and host files don't really mix since you have to be elevated to change the hosts file and you don't really want to elevate the portable application.

Gluck · 17th April 2018, 10:55

"... since you have to be elevated to change the hosts file and you don't really want to elevate the portable application".

What does it mean???

And If I want elevate the portable application?

Anders · 17th April 2018, 19:18

Quote:

Originally Posted by Gluck

And If I want elevate the portable application?

You just asked about Drag & Drop in another thread and you cannot elevate if you want to be a drag target.

Elevation is not really relevant to the topic at hand, this is about text file manipulation.

Gluck · 21st April 2018, 09:58

I have written:

WindowIcon Off
SilentInstall Silent
AutoCloseWindow True
OutFile Hosts.exe

Section

FileOpen $4 "$SYSDIR\drivers\etc\hosts" a
FileSeek $4 0 END
FileWrite $4 "$\r$\n" ; we write a new line
FileWrite $4 "144.144.144.144"
FileClose $4 ; and close the file

ExecWait "$EXEDIR\App\notepad.exe"

FileOpen $4 "$SYSDIR\drivers\etc\hosts" w
loop:
FileRead $0 $2
IfErrors done
StrCmp $2 "144.144.144$\r$\n" 0 +2
StrCpy $2 "$\r$\n"
FileWrite $1 $2
Goto loop

done:
FileClose $0

SectionEnd

The part BEFORE execution works fine (add a line at the end of hosts file).
The part AFTER execution delete hosts leaving the file empty...

What's wrong?

Thanks.

What is the elevation term? Is like acquire admin privileges for the program?

Anders · 21st April 2018, 11:00

Open with mode "w" deletes the old content.

Yes, elevation is UAC elevation to admin.

Gluck · 21st April 2018, 13:22

I have used a, but the IP remain.
I have used r, and I have found the IP duplicate...

What have I to write?
The code is optimized?

Anders · 21st April 2018, 23:35

Editing the file in-place is hard, try writing it to a new file instead.

jooseng · 22nd April 2018, 21:43

I use Portableapps.com launcher generator to make my portable app. This is what I do in my portable app.

To block a url:

CopyFiles /Silent "$SYSDIR\drivers\etc\hosts" "$SYSDIR\drivers\etc\hosts.BackupByxxxxPortable"
SetFileAttributes `$SYSDIR\drivers\etc\hosts` NORMAL
nsExec::Exec `"$SYSDIR\cmd.exe" /c @echo: >> "$SYSDIR\drivers\etc\hosts"`
nsExec::Exec `"$SYSDIR\cmd.exe" /c echo 127.0.0.1 www.xxxx.com >> "$SYSDIR\drivers\etc\hosts"`
SetFileAttributes `$SYSDIR\drivers\etc\hosts` READONLY

To restore the orginal hosts file:

${If} ${FileExists} "$SYSDIR\drivers\etc\hosts.BackupByxxxxPortable"
Delete "$SYSDIR\drivers\etc\hosts"
Rename "$SYSDIR\drivers\etc\hosts.BackupByxxxxPortable" "$SYSDIR\drivers\etc\hosts"
${EndIf}

16th April 2018, 09:21	#1
Gluck Member Join Date: Apr 2018 Posts: 80	Write a line I want write a line of text (in portable mode) in hosts file... What have I to write? Thanks

16th April 2018, 12:45	#2
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 4,873	Have you tried searching the forum and wiki? Portable applications and host files don't really mix since you have to be elevated to change the hosts file and you don't really want to elevate the portable application. IntOp $PostCount $PostCount + 1

21st April 2018, 11:00	#6
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 4,873	Open with mode "w" deletes the old content. Yes, elevation is UAC elevation to admin. IntOp $PostCount $PostCount + 1

21st April 2018, 23:35	#8
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 4,873	Editing the file in-place is hard, try writing it to a new file instead. IntOp $PostCount $PostCount + 1

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17th April 2018, 10:55	#3
Gluck Member Join Date: Apr 2018 Posts: 80	"... since you have to be elevated to change the hosts file and you don't really want to elevate the portable application". What does it mean??? And If I want elevate the portable application?

21st April 2018, 09:58	#5
Gluck Member Join Date: Apr 2018 Posts: 80	I have written: WindowIcon Off SilentInstall Silent AutoCloseWindow True OutFile Hosts.exe Section FileOpen $4 "$SYSDIR\drivers\etc\hosts" a FileSeek $4 0 END FileWrite $4 "$\r$\n" ; we write a new line FileWrite $4 "144.144.144.144" FileClose $4 ; and close the file ExecWait "$EXEDIR\App\notepad.exe" FileOpen $4 "$SYSDIR\drivers\etc\hosts" w loop: FileRead $0 $2 IfErrors done StrCmp $2 "144.144.144$\r$\n" 0 +2 StrCpy $2 "$\r$\n" FileWrite $1 $2 Goto loop done: FileClose $0 SectionEnd The part BEFORE execution works fine (add a line at the end of hosts file). The part AFTER execution delete hosts leaving the file empty... What's wrong? Thanks. What is the elevation term? Is like acquire admin privileges for the program?

21st April 2018, 13:22	#7
Gluck Member Join Date: Apr 2018 Posts: 80	I have used a, but the IP remain. I have used r, and I have found the IP duplicate... What have I to write? The code is optimized?

22nd April 2018, 21:43	#9
jooseng Junior Member Join Date: Apr 2018 Posts: 2	I use Portableapps.com launcher generator to make my portable app. This is what I do in my portable app. To block a url: CopyFiles /Silent "$SYSDIR\drivers\etc\hosts" "$SYSDIR\drivers\etc\hosts.BackupByxxxxPortable" SetFileAttributes `$SYSDIR\drivers\etc\hosts` NORMAL nsExec::Exec `"$SYSDIR\cmd.exe" /c @echo: >> "$SYSDIR\drivers\etc\hosts"` nsExec::Exec `"$SYSDIR\cmd.exe" /c echo 127.0.0.1 www.xxxx.com >> "$SYSDIR\drivers\etc\hosts"` SetFileAttributes `$SYSDIR\drivers\etc\hosts` READONLY To restore the orginal hosts file: ${If} ${FileExists} "$SYSDIR\drivers\etc\hosts.BackupByxxxxPortable" Delete "$SYSDIR\drivers\etc\hosts" Rename "$SYSDIR\drivers\etc\hosts.BackupByxxxxPortable" "$SYSDIR\drivers\etc\hosts" ${EndIf}