Usage of IfError - NSIS Forums

vkumara
4th January 2002 05:32 UTC

Usage of IfError
Hello All,

Could anybody let me know the usage of IfErrors with an
example...?
My situation is I've to process for 0 & non-Zero return values
of a function in the .NSI Script. I'd like to use this IfError
command in the .nsi script.
How the same cud b used ?

Thanks In Advance for help.
Regards
Venky

Smile2Me
4th January 2002 11:15 UTC

Venky,

eg, when trying to read a file to the end:

loop:
FileRead...
IfErrors -> Exit
Goto loop
Exit:

What is it you want to do exactly???

Good luck, greetz, Hendri.

vkumara
8th January 2002 11:49 UTC

Henri,

Thanx for your response.

I'm executing "myfile.exe" thru Exec Call with some parameters.

After excuting this I need to compare the Return value of the
function of myfile.exe

The function which generates myfile.exe does return 1 if the function succeeds.

This Return Value of 1 should be checked with IfErrors statement

How can I achieve this?

Thanks In Advance for your help.

Regards
Venky

Smile2Me
8th January 2002 15:39 UTC

Hi Venky,

The function which generates myfile.exe does return 1 if the function succeeds.

Is StrCmp or IntCmp what you're looking for???

I use some exe to check a RegCode, maybe this will give you some hint how to do it (because I do not understand what you are doing exactly: a function generates an exe???). See http://forums.winamp.com/showthread....threadid=70530 for RegCode.

Tell me if this solved the problem, good luck,

greetz, Hendri.

Schultz
8th January 2002 16:27 UTC

Are you trying to do something like this..


ClearErrors ;Make sure there isn't any previous errors.
ExecWait "C:\PathToMy\Program.exe" $0
IntCmp $0 "1" "" goto
;Does something if $0 = 1

goto:
;Comes here if something != 1 you can do other checkcs if you wish

You can also do the Iferrors call to see if an error was defined.. Because in the docs the $0 variable is undefined if you have it and an error occurs.

rainwater
8th January 2002 17:40 UTC

The IfErrors flag will be set if the exe returns a non-zero value. Zero means that the exe returned sucessfully. You need to use execwait to get the value.

Try:

ExecWait '"$INSTIDIR\myfile.exe"'
IFErrors 0 NoError
;;; Do something here when you have an error
MessageBox MB_OK "ERRORRRRRRRRRRRRRRRRRRR"
Goto EndIt
NoError:
MessageBox MB_OK "GRRRRRRRRRRRRRRRRRRREAT"
EndIt:
;; we're done

vkumara
9th January 2002 10:24 UTC

Hello All,

Thankx for your replies to the query I've posted.
Henri..sorry I did not elaborate my query.
This is I intended to do.
Execwait "myfile.exe" has been passed with some parameters.
I need to check the return values using IfErros Stmt.
I need to process some command only if the return value is 1.
I could do this by the follg. way
Execwait "myfile.exe" $0
IntCmp $0 "1" "" MyLabel
MessageBox MB_OK "Value is 1";
MyLabel:
SectionEnd.

vkumara
9th January 2002 13:00 UTC

Hello All,

Thankx for your replies to the query I've posted.
Henri..sorry I did not elaborate my query.
This is I intended to do.
Execwait "myfile.exe" has been passed with some parameters.
I need to check the return values using IfErros Stmt.
I need to process some command only if the return value is 1.
I could do this by the follg. way
Execwait "myfile.exe" $0
IntCmp $0 "1" "" MyLabel
MessageBox MB_OK "Value is 1";
MyLabel:
SectionEnd.

Thanks & Regards
Venky

petersa
9th January 2002 13:55 UTC

Hi Venky,

To get the return value, or 'error level' of a program, simply do:

  ExecWait 'MyProgram.exe' $0

$0 will contain the return value.

Hope this helps!
Alex

petersa
9th January 2002 13:57 UTC

What the Heck?
The forum system has choked on my response, so:

ExecWait 'MyProgram.exe' $0

That's the code. $0 will contain the return value of your program.

Here's the code for my above message. Who knows why it repeats. Incorrectly.

petersa
9th January 2002 14:04 UTC

vBulletin is Stuffed.
The forum system has yet again misinterpreted my response. If you type

ExecWait 'MyProg.exe' $0

then $0 will contain the return value of your program.