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How to read from a structure?

 
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Aslan
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Joined: 31 May 2001
Posts: 589
Location: Memphis, TN USA

PostPosted: Mon Apr 02, 2007 11:30 pm    Post subject: How to read from a structure? Reply with quote

How would you read back the following C structure?

Shouldn't the following work or did I do something wrong because all I get in return is a "0" for each variable.

Code:


   %%mask = 1
   %%iItem = 2
   %%state = 3
   %%stateMask = 4
   %%pszText = 5
   %%cchTextMax = 6
   %%iImage = 7
   %%Lparam = 8
   %%iIndent = 9
   %%iGroupId = 10

  %%LVITEM = @binary(DWORD,%%mask)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iItem)
  %%LVITEM = %%LVITEM@binary(DWORD,%%ISubItem)
  %%LVITEM = %%LVITEM@binary(DWORD,%%state)
  %%LVITEM = %%LVITEM@binary(DWORD,%%stateMask)
  %%LVITEM = %%LVITEM@binary(DWORD,%%pszText)
  %%LVITEM = %%LVITEM@binary(DWORD,%%cchTextMax)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iImage)
  %%LVITEM = %%LVITEM@binary(DWORD,%%Lparam)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iIndent)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iGroupId)

   %%mask =
   %%iItem =
   %%state =
   %%stateMask =
   %%pszText =
   %%cchTextMax =
   %%iImage =
   %%Lparam =
   %%iIndent =
   %%iGroupId =

  %%mask = @val(@BINARY(DWORD,@substr(%%LVITEM,1,4)))
  %%iItem = @val(@BINARY(DWORD,@substr(%%LVITEM,5,8)))
  %%state = @val(@BINARY(DWORD,@substr(%%LVITEM,9,12)))
  %%stateMask = @val(@BINARY(DWORD,@substr(%%LVITEM,13,16)))
  %%pszText = @val(@BINARY(DWORD,@substr(%%LVITEM,17,20)))
  %%cchTextMax = @val(@BINARY(DWORD,@substr(%%LVITEM,21,24)))
  %%iImage = @val(@BINARY(DWORD,@substr(%%LVITEM,25,28)))
  %%Lparam = @val(@BINARY(DWORD,@substr(%%LVITEM,29,32)))
  %%iIndent = @val(@BINARY(DWORD,@substr(%%LVITEM,33,36)))
  %%iGroupId = @val(@BINARY(DWORD,@substr(%%LVITEM,37,40)))
 
  Info %%mask@cr()%%iItem@cr()%%state@cr()%%stateMask@cr()%%pszText@cr()%%cchTextMax@cr()%%iImage@cr()%%Lparam@cr()%%iIndent@cr()%%iGroupId
 


Thanks in advance,

Aslan
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Hooligan
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Joined: 28 Oct 2003
Posts: 479
Location: California

PostPosted: Tue Apr 03, 2007 2:39 am    Post subject: Reply with quote

Hi Aslan,

Is this what you are after?

Code:
   %%mask = 1
   %%iItem = 2
   %%state = 3
   %%stateMask = 4
   %%pszText = 5
   %%cchTextMax = 6
   %%iImage = 7
   %%Lparam = 8
   %%iIndent = 9
   %%iGroupId = 10

  %%LVITEM = @binary(DWORD,%%mask)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iItem)
#  %%LVITEM = %%LVITEM@binary(DWORD,%%ISubItem)
  %%LVITEM = %%LVITEM@binary(DWORD,%%state)
  %%LVITEM = %%LVITEM@binary(DWORD,%%stateMask)
  %%LVITEM = %%LVITEM@binary(DWORD,%%pszText)
  %%LVITEM = %%LVITEM@binary(DWORD,%%cchTextMax)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iImage)
  %%LVITEM = %%LVITEM@binary(DWORD,%%Lparam)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iIndent)
  %%LVITEM = %%LVITEM@binary(DWORD,%%iGroupId)
 
   %%mask =
   %%iItem =
   %%state =
   %%stateMask =
   %%pszText =
   %%cchTextMax =
   %%iImage =
   %%Lparam =
   %%iIndent =
   %%iGroupId =

  %%mask = @val(@substr(%%LVITEM,1,4))
  %%iItem = @val(@substr(%%LVITEM,5,8))
  %%state = @val(@substr(%%LVITEM,9,12))
  %%stateMask = @val(@substr(%%LVITEM,13,16))
  %%pszText = @val(@substr(%%LVITEM,17,20))
  %%cchTextMax = @val(@substr(%%LVITEM,21,24))
  %%iImage = @val(@substr(%%LVITEM,25,28))
  %%Lparam = @val(@substr(%%LVITEM,29,32))
  %%iIndent = @val(@substr(%%LVITEM,33,36))
  %%iGroupId = @val(@substr(%%LVITEM,37,40))
 
  Info %%mask@cr()%%iItem@cr()%%state@cr()%%stateMask@cr()%%pszText@cr()%%cchTextMax@cr()%%iImage@cr()%%Lparam@cr()%%iIndent@cr()%%iGroupId

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Aslan
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Joined: 31 May 2001
Posts: 589
Location: Memphis, TN USA

PostPosted: Tue Apr 03, 2007 3:59 am    Post subject: Reply with quote

Yep, It took several re-reads of the helpfile and some head pounding and I finally ended up with the same code as you. Stupid

hehe.. I see you caught the other error I made too Wink

Thanks Hooligan

I think I need to walk away from the monitor for a while, it's beginning to blur.
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vdsalchemist
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Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA

PostPosted: Tue Apr 03, 2007 1:15 pm    Post subject: Reply with quote

Aslan,
Hooligan beat me too it but I can explain why the code below does not work
Code:

%%mask = @val(@BINARY(DWORD,@substr(%%LVITEM,1,4)))


The @Binary() function take Variable type and a string value. The string value is converted to the specified variable type. When you placed @substr as the parameter it just read the 4 raw bytes from %%LVITEM which the @binary() function could not convert since it was not a plain ASCII string. The @val() function converts the raw bytes back into a string. Since @binary() was returning 0 @val() returned 0.

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