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Bytales
PostPosted: September 13th, 2008, 1:51 pm 
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Joined: September 6th, 2008, 3:11 pm
Posts: 84
Ok, consider the following expression

Code:
PixelSearch, OutPutVarX, OutPutVarY, 186, 643, 282, 643, 0x76946D, 25


If the pixel is found, then OutPutVarX, OutPutVarY EXIST
If the pixel is not found, they don't exist.

Is there a way to check if OutPutVarX exists ?


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SKAN
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PostPosted: September 13th, 2008, 3:51 pm 
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Joined: December 26th, 2005, 4:40 pm
Posts: 8776
What you had asked for...
Code:
PixelSearch, OutPutVarX, OutPutVarY, 186, 643, 282, 643, 0x76946D, 25
If Not varExist( OutPutVarX )
     ExitApp
 
; www.autohotkey.com/forum/viewtopic.php?p=83371#83371
varExist(ByRef v) { ; Requires 1.0.46+
   return &v = &n ? 0 : v = "" ? 2 : 1
}


..is unneccessary, and the following method is recommended:

Code:
PixelSearch, OutPutVarX, OutPutVarY, 186, 643, 282, 643, 0x76946D, 25
If ( ErrorLevel=1 ) ; means above command failed
   ExitApp


:)

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Bytales
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PostPosted: September 13th, 2008, 6:39 pm 
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Joined: September 6th, 2008, 3:11 pm
Posts: 84
The reason i asked if var exist is because i want to make the pixel search and then check later if it worked, not right away !


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Chronos
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PostPosted: September 13th, 2008, 6:50 pm 
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Joined: September 12th, 2008, 10:48 pm
Posts: 8
Skan, that's a nice one You have there, personally i think this is easier:

Code:
OutX =
OutY = 0

if StrLen(OutX)>0
   MsgBox OutX Exists!
Else
   MsgBox OutX? WTF?

MsgBox % "OutY" ( StrLen(OutY)>0 ? " exists" : "? WTF?" )


The last MsgBox is just the ternary version of the OutX-If-Else-construct.

cheers,

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engunneer
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PostPosted: September 14th, 2008, 12:38 am 
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you can always test to make sure OutPutVarX is not ""

Code:
If (OutPutVarX != "")
{
  msgbox it exists!
}

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Serenity
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PostPosted: September 14th, 2008, 1:00 am 
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Joined: November 8th, 2004, 12:46 am
Posts: 1271
Bytales wrote:
The reason i asked if var exist is because i want to make the pixel search and then check later if it worked, not right away !


You could store the ErrorLevel from PixelSearch in a variable:

Code:
PixelSearch, OutPutVarX, OutPutVarY, 186, 643, 282, 643, 0x76946D, 25
SavedForLater := ErrorLevel

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Mustang
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PostPosted: September 14th, 2008, 3:26 am 
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Joined: May 17th, 2007, 9:06 pm
Posts: 421
Location: England
Serenity wrote:
You could store the ErrorLevel from PixelSearch in a variable:

This is the solution I normally choose to use


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