check if variable has a value

[gcue]

is there a way to check if a variable has a value to it? i remmebr seeing something but cant find it in the documentation.

thanks.

[DarkMatter]

You could do this:

If $var <> "" Then
;What to do
EndIf

[gcue]

ahh there it is!

thanks!

[gcue]

hmmm not getting accurate results:

(what im trying to do is, if $status doesnt have anything set for it then set $compression)

For $x = 1 to $assets[0]

Ping($assets[$x])
If @error Then
$status = "OFFLINE"
$compression="???"
EndIf

RegRead ( "\\" & $assets[$x] & "\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "ProgramFilesDir" )
If @error Then
$status = "NO_ADMIN_RIGHTS"
$compression="???"
EndIf


If Not $status <> "" Then
$compression = IniRead("\\" & $assets[$x] & "\c$\lotus\notes\notes.ini", "Notes", "TCPIP", "NotFound")

If $compression="TCP, 0, 15, 0,,12320" Then
   $compression="YES"
Else
   $compression="NO"
EndIf
EndIf

Edited April 2, 2008 by gcue

[Monamo]

hmmm not getting accurate results:

(what im trying to do is, if $status doesnt have anything set for it then set $compression)

For $x = 1 to $assets[0]

Ping($assets[$x])
If @error Then
$status = "OFFLINE"
$compression="???"
EndIf

RegRead ( "\\" & $assets[$x] & "\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "ProgramFilesDir" )
If @error Then
$status = "NO_ADMIN_RIGHTS"
$compression="???"
EndIf


If Not $status <> "" Then
$compression = IniRead("\\" & $assets[$x] & "\c$\lotus\notes\notes.ini", "Notes", "TCPIP", "NotFound")

If $compression="TCP, 0, 15, 0,,12320" Then
   $compression="YES"
Else
   $compression="NO"
EndIf
EndIf

Are you ever initializing/declaring the $status variable? Working from only the snippet posted, that's one detail I'd check.

Plus in your example, is the "double negative" a mistype?

If Not $status <> "" Then

It reads as:

If $status isn't not equal to ""

[gcue]

right.

if $status does not have a value then....

is there a better way to say it?

Ping($assets[$x])
If @error Then
$status="OFFLINE"
$compression="???"
EndIf

RegRead ( "\\" & $assets[$x] & "\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "ProgramFilesDir" )
If @error Then
$status="NO_ADMIN_RIGHTS"
$compression="???"
EndIf

Dim $status
If Not $status <> "" Then
$compression = IniRead("\\" & $assets[$x] & "\c$\lotus\notes\notes.ini", "Notes", "TCPIP", "NotFound")
$status=""


If $compression="TCP, 0, 15, 0,,12320" Then
   $compression="YES"
Else
   $compression="NO"
EndIf
EndIf

Edited April 2, 2008 by gcue

[someone]

No Monamo is right you have it backwards...

You can either have

If $status <> "" Then

or

If Not $status = "" Then

<> already makes it not equal, putting a not there puts it back to equal.

[redsleeves]

Wouldn't the following also be valid?

If Not $status Then
    $compression = IniRead("\\" & $assets[$x] & "\c$\lotus\notes\notes.ini", "Notes", "TCPIP", "NotFound")
EndIf

Would it be in error to use it like this?

Dim $status
Ping($assets[$x])

If @error Then
    $status="OFFLINE"
    $compression="???"
EndIf
RegRead ( "\\" & $assets[$x] & "\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion", "ProgramFilesDir" )
If @error Then
    $status="NO_ADMIN_RIGHTS"
    $compression="???"
EndIf
If Not $status Then
    $compression = IniRead("\\" & $assets[$x] & "\c$\lotus\notes\notes.ini", "Notes", "TCPIP", "NotFound")
    If $compression="TCP, 0, 15, 0,,12320" Then
       $compression="YES"
    Else
       $compression="NO"
    EndIf
EndIf

Thanks.

[crashdemons]

If Not $status Then

If $status is Not True ....?

depends on how AutoIt handles if strings are true/false

- Some languages state all strings as "false" so I'm a little afraid to use that too much or I might mess up elsewhere

[PsaltyDS]

Wouldn't the following also be valid?

If Not $status Then
    $compression = IniRead("\\" & $assets[$x] & "\c$\lotus\notes\notes.ini", "Notes", "TCPIP", "NotFound")
EndIf

That could work. When a string variable is used in AutoIt for a boolean operation, "" = False, and any string at all = True.

So all of the following strings are boolean True: "0", "1", "True", "False", "Nothing", "Something".

I don't like depending on mixed variable type operations to always keep working however they happen to now, though. So I would prefer:

If $status = "" Then

[redsleeves]

Thanks for the replies and explanations.