Hi folks,

yap it's me again.. asking more question than ever....

I am reversing this app, and i want to inject some code into this routine that is shared by a few buttons... I need to know which button was clicked so that i can patch appropriately... how should i go about finding the handle for the sender of this routine... it is a Delphi app!!!

Thanx.

Hi binh:

You can do this by running Spy ++ and noting down the handle of those buttons. Then in SICE, do a bmsg (ie breakpoint on messages) and set a WM_COMMAND with BN_CLICKED. You can look up the definitions of these in MSDN.

But as for code injecting, you'll have to trap the WM_COMMAND itself (i.e. subclass the window containing these buttons) such that button click notifications arrive to your function and you can then play "master".

Hope this helps,

Signed,
-- FoxThree

Delphi apps are little bit different.Ifyou dissamble with dede you can see the events when buttons are clicked like Button1Click etc.You can change this functions.Also in Dafixer's site there is a tutorial by him about adding functionality existing delphi apps.
hxxp://www.balbaro.com/dafixer/D1.html

Man, I must be getting old. Ofcourse, try to disassemble the program using DeDe. You'll get a few laughs

Signed,
-- FoxThree

... er, unless ofcourse it is obfuscated by one of the delphi manglers

Thanx, guys

Yep, Delphi apps are more different... yeah i have read Dafixer's tutorial before and Dede is such a lovely tool... but i am still having problem... ah well since when we dont get problems :>... but hopefully someone can tell me where i did wrong...

Okie.... I wanted to add OnClick event on one of the label, so i go to the resource section (DFM), add in OnClick : Label1Click...

Then i go to the declration section in data section, increase the number of procedure declared in form 1 from 8 to 9 (1 more)... then i inserted a new procedure, with the same format as other procedure, aka : Hint, VA, ProcName
0000 0050 4000 0BLabel1Click
(of course Label1Click was in Hex :>>>

Yeah then i adjustted the caption etc so that the offset of others are same, ( i got lots of stream read error befoer getting this right)... so now Dede decompile it fine... it recognise my added procedure but when i run the prog, i get this error, Label.OnClick : invalid operand.....

When i change Label1OnClick to button1Click (an proc from the original program), it runs fine and when i clicked on label1, itperform button1click procedure.. but if i change this button1click to label1 click it reports the error...

So my question is do I have to declare my new added proc somewhere else as well before i can call it? (make sense but a search in the exe file for name of the original proc did not yield any other info :<.... Hope i made myself clear... somehow i feel that you would not understand what i am writing about :<<<.

Ah well... that is all... hopefully soemone can tell me what is wrong?

P.S : DaFixer tutorial only includes modifying event handler of existign procedure, not adding new one....

The only thing I can think of is that you have not accounted for the appropriate parameters that are to be passed to the OnClick function, and hence the "invalid parameter" message ?

-nt20