FindProcess

Author: demiller9 (talk, contrib)

This function was written with inspiration of Get a list of running processes, which pops up a message box for each running process. This function returns a boolean (0/1) if any of the processes in the input parameter are running.

Save this script as FindProcess.nsh and include it in your script. Call it like this:

!include FindProcess.nsh
 
${FindProcess} "Calc.exe,Firefox.exe" $0
${If} $0 <> 0
  MessageBox MB_OK "Found at least one process"
${Else}
  MessageBox MB_OK "Neither process found"
${EndIf}

or in a loop like this:

${Do}
  ${FindProcess} "Notepad.exe" $0
  Sleep 500
${LoopWhile} $0 <> 0

FindProcess.nsh

/*  FindProcess.nsh
*   
*   written by Donald Miller
*   Mar 7, 2007
*   
*/
 
!include LogicLib.nsh
!include WordFunc.nsh
!insertmacro WordFind
 
!ifndef FindProcess
!define FindProcess         '!insertmacro FindProcess'
 
!macro FindProcess ProcessList BoolReturn
    Push ${ProcessList}
    Call FindProcess
    Pop ${BoolReturn}
!macroend
 
Function FindProcess
  # return True if any process in ProcessList is active
  Exch $0     ; get ProcessList, save $0
  Push $1
  Push $2
  Push $R0
  Push $R1
  Push $R2
 
  StrCpy $2 "$0,"                 ; $2 = ProcessList
 
  Push 0                          ; set return value = False
 
  # method based upon one by Phoenix1701@gmail.com  1/27/07
 
  System::Alloc 1024
  Pop $R0                         ; process list buffer
 
  # get an array of all process ids
  System::Call "Psapi::EnumProcesses(i R0, i 1024, *i .R1)i .r0"
  ${Unless} $0 = 0
 
      IntOp $R1 $R1 / 4           ; Divide by sizeof(DWORD) to get $R1 process count
      IntOp $R1 $R1 - 1           ; decr for 0 base loop
 
      ClearErrors
      ${For} $R2 0 $R1
          # get a PID from the array
          IntOp $0 $R2 << 2
          IntOp $0 $0 + $R0           ; buffer.dword[i]
          System::Call "*$0(i .r0)"   ; Get next PID
 
          ${Unless} $0 = 0
              Push $0
              Call GetProcessName
              Pop $1
 
              # is this process one we are looking for?
              ${WordFind} '$2' ',' 'E/$1' $0
              ${Unless} ${Errors}
                  # yes, change return value
                  Pop $0          ; discard old result
                  Push 1          ; set return True
 
                  # exit the loop
                  ${Break}
              ${EndUnless}
          ${EndUnless}
      ${Next}
 
  ${EndUnless}
 
  System::Free $R0
 
  Pop $0              ; get return value
  Pop $R2             ; restore registers
  Pop $R1
  Pop $R0
  Pop $2
  Pop $1
  Exch $0
FunctionEnd
 
Function GetProcessName
  # ( Pid -- ProcessName )
  Exch $2                     ; get Pid, save $2
  Push $0
  Push $1
  Push $3
  Push $R0
 
  System::Call "Kernel32::OpenProcess(i 1040, i 0, i r2)i .r3"
 
  StrCpy $2 "<unknown>"       ; set return value
 
  ${Unless} $3 = 0            ; $3 is hProcess
      # get hMod array
      System::Alloc 1024
      Pop $R0
 
      # params: Pid, &hMod, sizeof(hMod), &cb
      System::Call "Psapi::EnumProcessModules(i r3, i R0, i 1024, *i .r1)i .r0"
 
      ${Unless} $0 = 0
          # get first hMod
          System::Call "*$R0(i .r0)"
 
          # get BaseName; params: Pid, hMod, szBuffer, sizeof(szBuffer)
          System::Call "Psapi::GetModuleBaseName(i r3, i r0, t .r2, i 256)i .r0"
      ${EndUnless}
 
      System::Free $R0
      System::Call "kernel32::CloseHandle(i r3)"
  ${EndUnless}
 
  Pop $R0                     ; restore registers
  Pop $3
  Pop $1
  Pop $0
  Exch $2                     ; save process name
FunctionEnd
!endif