Debugger written in VB - needs a bit of cleaning up...

[MerrionComputin]

The attached is a debugger/dependency walker application written in VB. I need a bit of help adding the ability to view (and ultimately edit) the resources held in the executable (and it's loaded libraries)

You will need a good understanding of API to do this...

[MerrionComputin]

Hmm - kinda depressing that nobody is even prepared to download the code and take a look.

[plenderj]

Originally posted by MerrionComputin
Hmm - kinda depressing that nobody is even prepared to download the code and take a look.

Dunc, that's because your level of VB expertise is so far above everyone else's, it sorta leaves us all in the dark a little.
Lonely at the top 'eh ?

[MerrionComputin]

I shall have to write some catch-up articles so

[Deucy]

i was debugging IEXPLORE.EXE and it gave me an overflow.. any ideas? coz i need complete control over IEXPLORE.EXE.. i want to get events from it and all that..

[Megistal]

I got the same problem (the Overflow), but with McAfee Virus Scan.

[MerrionComputin]

You couldn't perhaps give me the line of code that gave the overflow?

[plenderj]

Originally posted by MerrionComputin
You couldn't perhaps give me the line of code that gave the overflow?

Yeah just give them a few minutes to dig up the source for IE and Mcafee anti-virus

[MerrionComputin]

OK ...backs away slowly...

I'm guessing the VB code was throwing the overflow error? When the message comes up press CTRL+BREAK and the line causeing the error should show up..?

[Megistal]

Here's the place in the VB code:
(For VirusScan)

Module: DebugMain.bas

This line: If btSrc + btCarry + btDest > &HFF Then

In this context:

If btSrc + btCarry + btDest > &HFF Then
btCarry = (btSrc + btCarry + btDest) And &HFF00
bt3 = (btSrc + btCarry + btDest) And &HFF
Else
bt3 = (btSrc + btCarry + btDest)
End If

[MerrionComputin]

Oops - perhaps I should clear out the carry flag

Try:-

'\\ --[ByteByByteAdd]-----------------------------------------------
'\\ Adds two longs in a byte-by-byte manner to prevent nast overflow
'\\ errors when VB longs are mixed up with C ULONGs
'\\ ----------------------------------------------------------------
Public Function ByteByByteAdd(ByVal lIn1 As Long, ByVal lIn2 As Long) As Long
 
Dim btSrc As Byte
Dim btDest As Byte
Dim btCarry As Integer
 
Dim bt1 As Byte
Dim bt2 As Byte
Dim bt3 As Byte
Dim bt4 As Byte
 
Dim lRet As Long
 
btSrc = LoByte(LoWord(lIn1))
btDest = LoByte(LoWord(lIn2))
 
If btSrc + btDest > &HFF Then
    btCarry = (btSrc + btDest) And &HFF00
    bt1 = (btSrc + btDest) And &HFF
Else
    bt1 = (btSrc + btDest)
    btCarry = 0
End If
 
btSrc = HiByte(LoWord(lIn1))
btDest = HiByte(LoWord(lIn2))
 
If btSrc + btCarry + btDest > &HFF Then
    btCarry = (btSrc + btCarry + btDest) And &HFF00
    bt2 = (btSrc + btCarry + btDest) And &HFF
Else
    bt2 = (btSrc + btCarry + btDest)
    btCarry = 0
End If
 
btSrc = LoByte(HiWord(lIn1))
btDest = LoByte(HiWord(lIn2))
 
If btSrc + btCarry + btDest > &HFF Then
    btCarry = (btSrc + btCarry + btDest) And &HFF00
    bt3 = (btSrc + btCarry + btDest) And &HFF
Else
    bt3 = (btSrc + btCarry + btDest)
    btCarry = 0
End If
 
btSrc = HiByte(HiWord(lIn1))
btDest = HiByte(HiWord(lIn2))
 
If btSrc + btCarry + btDest > &HFF Then
    btCarry = (btSrc + btCarry + btDest) And &HFF00
    bt4 = (btSrc + btCarry + btDest) And &HFF
Else
    bt4 = (btSrc + btCarry + btDest)
    btCarry = 0
End If
 
ByteByByteAdd = MakeLong(MakeWord(bt1, bt2), MakeWord(bt3, bt4))
 
End Function