Need help with CreateToolhelp32Snapshot

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CFJ0

Joined: 06 Jun 2007
Posts: 9

CFJ0 07 Apr 2008, 17:13

I don't understand why this wont compile at all :S

This is the compile error:

Code:

flat assembler  version 1.67.26  (1248632 kilobytes memory)
c:\winasm\projects\Test\TestSnapshot32.asm [34]: mov dword [ProcessEntry.dwSize], sizeof.PROCESSENTRY32
error: undefined symbol 'ProcessEntry.dwSize'.

Code:

format PE GUI 4.0
include '%inc%\win32ax.inc'

struct PROCESSENTRY32
 .dwSize               dd ?
 .cntUsage             dd ?
 .th32ProcessID        dd ?
 .th32DefaultHeapID    dd ?
 .th32ModuleID         dd ?
 .cntThreads           dd ?
 .th32ParentProcessID  dd ?
 .pcPriClassBase       dd ?
 .dwFlags              dd ?
 .szExeFile            rb 260 
ends 

TH32CS_SNAPPROCESS = 0x2

;------------------------------------------------
;Declares
;------------------------------------------------
.data
 SnapHandle     dd ?
 ProcessEntry   PROCESSENTRY32
 szProcessName  db "explorer.exe", 0
 
.code
 Main:
;------------------------------------------------ 
;Create Snapshot of Processes
;------------------------------------------------
  mov dword [ProcessEntry.dwSize], sizeof.PROCESSENTRY32
  invoke CreateToolhelp32Snapshot, TH32CS_SNAPPROCESS, 0
  cmp eax, 0
  je Exit
  mov dword [SnapHandle], eax
  invoke Process32First, dword [SnapHandle], ProcessEntry

;------------------------------------------------
;Loop Through All Processes
;------------------------------------------------ 
NextProcess:
  cmp eax, 0
  je Exit
  invoke lstrcmpi, ProcessEntryOwn.szExeFile, szProcessName
  cmp eax, 0
  je Found
  invoke Process32Next, dword [SnapHandle], ProcessEntry
  jmp NextProcess 
;------------------------------------------------
;Show a messagebox if found
;------------------------------------------------
Found:  
 invoke MessageBox, 0, "Process Found!", szProcessName, MB_ICONQUESTION
 jmp Exit
 
;------------------------------------------------
;Exit the loader when done
;------------------------------------------------
Exit:  
  invoke ExitProcess, 0
.end Main

07 Apr 2008, 17:13

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 07 Apr 2008, 17:19

hello,
the struct macro does not need "." character in.

have a good day

07 Apr 2008, 17:19

wisepenguin

Joined: 30 Mar 2005
Posts: 129

wisepenguin 07 Apr 2008, 17:19

ps.

Code:

struct PROCESSENTRY32 
 dwSize               dd ?
 cntUsage             dd ?
 th32ProcessID        dd ?
 th32DefaultHeapID    dd ?
 th32ModuleID         dd ?
 cntThreads           dd ?
 th32ParentProcessID  dd ?
 pcPriClassBase       dd ?
 dwFlags              dd ?
 szExeFile            rb 260
ends

07 Apr 2008, 17:19

CFJ0

Joined: 06 Jun 2007
Posts: 9

CFJ0 07 Apr 2008, 17:28

Thanks

07 Apr 2008, 17:28

DJ Mauretto

Joined: 14 Mar 2007
Posts: 464
Location: Rome,Italy

DJ Mauretto 07 Apr 2008, 17:30

This compile fine Wink

Code:

format PE GUI 4.0 
include '%inc%\win32ax.inc' 

struct PROCESSENTRY32 
 .dwSize               dd ? 
 .cntUsage             dd ? 
 .th32ProcessID        dd ? 
 .th32DefaultHeapID    dd ? 
 .th32ModuleID         dd ? 
 .cntThreads           dd ? 
 .th32ParentProcessID  dd ? 
 .pcPriClassBase       dd ? 
 .dwFlags              dd ? 
 .szExeFile            rb 260  
ends  

TH32CS_SNAPPROCESS = 0x2 

;------------------------------------------------ 
;Declares 
;------------------------------------------------ 
.data 
 SnapHandle     dd ? 
 ProcessEntry   PROCESSENTRY32 
 szProcessName  db "explorer.exe", 0 
  
.code 
 Main: 
;------------------------------------------------  
;Create Snapshot of Processes 
;------------------------------------------------ 
  mov dword [ProcessEntry..dwSize], sizeof.PROCESSENTRY32 
  invoke CreateToolhelp32Snapshot, TH32CS_SNAPPROCESS, 0 
  cmp eax, 0 
  je Exit 
  mov dword [SnapHandle], eax 
  invoke Process32First, dword [SnapHandle], ProcessEntry 

;------------------------------------------------ 
;Loop Through All Processes 
;------------------------------------------------  
NextProcess: 
  cmp eax, 0 
  je Exit 
  invoke lstrcmpi, ProcessEntry..szExeFile, szProcessName 
  cmp eax, 0 
  je Found 
  invoke Process32Next, dword [SnapHandle], ProcessEntry 
  jmp NextProcess  
;------------------------------------------------ 
;Show a messagebox if found 
;------------------------------------------------ 
Found:   
 invoke MessageBox, 0, "Process Found!", szProcessName, MB_ICONQUESTION 
 jmp Exit 
  
;------------------------------------------------ 
;Exit the loader when done 
;------------------------------------------------ 
Exit:   
  invoke ExitProcess, 0 
.end Main

07 Apr 2008, 17:30

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