Add bytes

[Kip]

Hi, I found a dll on this forum to create structs by calling a dll.

It was posted a long time ago, before structures were included in AutoIt.

It's called DllMem.dll. You don't need it for my problem though.

I have a piece of code (not in AutoIt, but that doesn't matter either)

$ReadInt = new DLL("DllMem.dll", "ReadInt", INT, INT+INT); // just loading the function nothing special
$ReadByte = new DLL("DllMem.dll", "ReadByte", INT, INT+INT); // same story

$ret = $ReadInt( $POINT, 4 ); // Returns 757 (byte 0-3)

$ReadByte( $POINT, 0 ); // Returns 67 (byte 0)
$ReadByte( $POINT, 1 ); // Returns 1 (byte 1)
$ReadByte( $POINT, 2 ); // Returns 0 (byte 2)
$ReadByte( $POINT, 3 ); // Returns 0 (byte 3)

Now, what if I don't know 757. What do I have to do with 67, 1, 0 and 0 to get to 757?

Thanks, Kip.

Edited June 5, 2009 by Kip

[Squirrely1]

...I have a piece of code (not in AutoIt, but that doesn't matter either)...

Netherlands - You know you really probably should write your code in the selfsame language from beginning to end - "Not AutoIt" is probably a language that does not use "$" to designate a variable - what language are you trying to use?

[martin]

Hi, I found a dll on this forum to create structs by calling a dll.

It was posted a long time ago, before structures were included in AutoIt.

It's called DllMem.dll. You don't need it for my problem though.

I have a piece of code (not in AutoIt, but that doesn't matter either)

$ReadInt = new DLL("DllMem.dll", "ReadInt", INT, INT+INT); // just loading the function nothing special
 $ReadByte = new DLL("DllMem.dll", "ReadByte", INT, INT+INT); // same story
 
 $ret = $ReadInt( $POINT, 4 ); // Returns 757 (byte 0-3)
 
 $ReadByte( $POINT, 0 ); // Returns 67 (byte 0)
 $ReadByte( $POINT, 1 ); // Returns 1 (byte 1)
 $ReadByte( $POINT, 2 ); // Returns 0 (byte 2)
 $ReadByte( $POINT, 3 ); // Returns 0 (byte 3)

Now, what if I don't know 757. What do I have to do with 67, 1, 0 and 0 to get to 757?

Thanks, Kip.

Have you got any more example values? I don't see the link between 67,1 and 757. Are you sure the dll function is returning data from the same struct for RedByte and ReadInt?

[Kip]

Oh damn, there was a bug in my script. I'm starting to see a connection now, wait just give me a minute.

Edit:

ok eerm:

If ReadInt is below 128 then the first ReadByte = the same value as ReadInt.

When ReadInt is above 128 but below 256, ReadInt = 128+(128+ReadByte), and ReadByte is a negative number

after that the second ReadByte begins counting, and so on.

Edit2: I just read it again and I can understand if you don't get it

There must be some kind of Bit function for this...

examples:

ReadInt = 70 ; it's under 128, so the first ReadByte is the same.

Byte1 = 70

Byte2 = 0

Byte3 = 0

Byte4 = 0

=

ReadInt = 175 ; It's above 128 and below 256, so the first ReadByte = 128+(128+-81)

Byte1 = -81 ; 128+(128+-81) = 175

Byte2 = 0

Byte3 = 0

Byte4 = 0

ReadInt = 260

Byte1 = 4

Byte2 = 1

Byte3 = 0

Byte4 = 0

ReadInt = 390

Byte1 = -122

Byte2 = 1

Byte3 = 0

Byte4 = 0

256 is the maximal number of different values one byte can hold. So... it makes sense (somewhere)

Edited June 5, 2009 by Kip

[trancexx]

It's this:

$iExample1 = 0x00000070
$iExample2 = 0x000000AF
$iExample3 = 0x00000104
$iExample4 = 0x00000186

Read bytes.

[Kip]

I'm sorry, I don't understand what you're trying to say.

Edit: Ooh, wait...

Edited June 5, 2009 by Kip

[martin]

I'm sorry, I don't understand what you're trying to say.

Edit: Ooh, wait...

$s1 = dllstructcreate("int")
$s2 = dllstructcreate("ubyte[4]",dllstructgetptr($s1))

Dllstructsetdata($s1,1,260)

ConsoleWrite(dllstructgetdata($s2,1,1) & @CRLF)
ConsoleWrite(dllstructgetdata($s2,1,2) & @CRLF)
ConsoleWrite(dllstructgetdata($s2,1,3) & @CRLF)
ConsoleWrite(dllstructgetdata($s2,1,4) & @CRLF)

[Kip]

So, in AutoIt, it would be:

$b1 = -122
$b2 = 1
$b3 = 0
$b4 = 0

$sHex = Hex($b4,2) & Hex($b3,2) & Hex($b2,2) & Hex($b1,2)

MsgBox(0,"sds", "Hex: 0x"& $sHex &@CRLF& "Dec: "&Dec($sHex) )

[trancexx]

$s1 = dllstructcreate("int")
$s2 = dllstructcreate("ubyte[4]",dllstructgetptr($s1))

Dllstructsetdata($s1,1,260)

ConsoleWrite(dllstructgetdata($s2,1,1) & @CRLF)
ConsoleWrite(dllstructgetdata($s2,1,2) & @CRLF)
ConsoleWrite(dllstructgetdata($s2,1,3) & @CRLF)
ConsoleWrite(dllstructgetdata($s2,1,4) & @CRLF)

You're fast