根据进程名获取进程ID

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include Sys
require 'win32ole'
require 'socket'
require 'date'

# The Sys module serves as a namespace only
module Sys
   
   # The ProcTable class encapsulates process table information
   class ProcTable
      
      # There is no constructor
      private_class_method :new
      
      # Error typically raised if one of the Sys::ProcTable methods fails
      class Error < StandardError; end
      
      # The version of the sys-proctable library
      VERSION = '0.9.0'
      
      # The comm field corresponds to the 'name' field.  The 'cmdline' field
      # is the CommandLine attribute on Windows XP or later,or the 
      # 'executable_path' field on Windows 2000 or earlier.
      #
      @fields = %w/
         caption
         cmdline
         comm
         creation_class_name
         creation_date
         cs_creation_class_name
         cs_name
         description
         executable_path
         execution_state
         handle
         handle_count
         install_date
         kernel_mode_time
         maximum_working_set_size
         minimum_working_set_size
         name
         os_creation_class_name
         os_name
         other_operation_count
         other_transfer_count
         page_faults
         page_file_usage
         ppid
         peak_page_file_usage
         peak_virtual_size
         peak_working_set_size
         priority
         private_page_count
         pid
         quota_non_paged_pool_usage
         quota_paged_pool_usage
         quota_peak_non_paged_pool_usage
         quota_peak_paged_pool_usage
         read_operation_count
         read_transfer_count
         session_id
         status
         termination_date
         thread_count
         user_mode_time
         virtual_size
         windows_version
         working_set_size
         write_operation_count
         write_transfer_count
      /
      
      ProcTableStruct = Struct.new("ProcTableStruct",*@fields)
      
      # call-seq:
      #    ProcTable.fields
      # 
      # Returns an array of fields that each ProcTableStruct will contain.  This
      # may be useful if you want to know in advance what fields are available
      # without having to perform at least one read of the /proc table.
      #
      def self.fields
         @fields
      end
      
      # call-seq:
      #    ProcTable.ps(pid=nil)
      #    ProcTable.ps(pid=nil){ |ps| ... }
      # 
      # In block form,yields a ProcTableStruct for each process entry that you
      # have rights to.  This method returns an array of ProcTableStruct's in
      # non-block form.
      # 
      # If a +pid+ is provided,then only a single ProcTableStruct is yielded or
      # returned,or nil if no process information is found for that +pid+.
      #
      def self.ps(pid=nil,host=Socket.gethostname)
         if pid
            raise TypeError unless pid.kind_of?(Fixnum)
         end

         array  = block_given? ? nil : []
         struct = nil
              
         begin
            wmi = WIN32OLE.connect("winmgmts://#{host}/root/cimv2")
         rescue WIN32OLERuntimeError => e
            raise Error,e # Re-raise as ProcTable::Error
         else
            wmi.InstancesOf("Win32_Process").each{ |wproc|        
               if pid                
                  next unless wproc.ProcessId == pid
               end

               # Some fields are added later,and so are nil initially
               struct = ProcTableStruct.new(
                  wproc.Caption,nil,# Added later,based on OS version
                  wproc.Name,wproc.CreationClassName,self.parse_ms_date(wproc.CreationDate),wproc.CSCreationClassName,wproc.CSName,wproc.Description,wproc.ExecutablePath,wproc.ExecutionState,wproc.Handle,wproc.HandleCount,self.parse_ms_date(wproc.InstallDate),self.convert(wproc.KernelModeTime),wproc.MaximumWorkingSetSize,wproc.MinimumWorkingSetSize,wproc.Name,wproc.OSCreationClassName,wproc.OSName,self.convert(wproc.OtherOperationCount),self.convert(wproc.OtherTransferCount),wproc.PageFaults,wproc.PageFileUsage,wproc.ParentProcessId,self.convert(wproc.PeakPageFileUsage),self.convert(wproc.PeakVirtualSize),self.convert(wproc.PeakWorkingSetSize),wproc.Priority,self.convert(wproc.PrivatePageCount),wproc.ProcessId,wproc.QuotaNonPagedPoolUsage,wproc.QuotaPagedPoolUsage,wproc.QuotaPeakNonPagedPoolUsage,wproc.QuotaPeakPagedPoolUsage,self.convert(wproc.ReadOperationCount),self.convert(wproc.ReadTransferCount),wproc.SessionId,wproc.Status,self.parse_ms_date(wproc.TerminationDate),wproc.ThreadCount,self.convert(wproc.UserModeTime),self.convert(wproc.VirtualSize),wproc.WindowsVersion,self.convert(wproc.WorkingSetSize),self.convert(wproc.WriteOperationCount),self.convert(wproc.WriteTransferCount)
               )
            
               ###############################################################
               # On Windows XP or later,set the cmdline to the CommandLine
               # attribute.  Otherwise,set it to the ExecutablePath
               # attribute.
               ###############################################################
               if wproc.WindowsVersion.to_f < 5.1
                  struct.cmdline = wproc.ExecutablePath
               else
                  struct.cmdline = wproc.CommandLine
               end
               
               struct.freeze # This is read-only data
              
               if block_given?
                  yield struct
               else
                  array << struct
               end
            }
         end

         pid ? struct : array
      end
      
      private
      
      #######################################################################
      # Converts a string in the format '20040703074625.015625-360' into a
      # Ruby Time object.
      #######################################################################
      def self.parse_ms_date(str)
         return if str.nil?
         return Date.parse(str.split('.').first)
      end
      
      #####################################################################
      # There is a bug in win32ole where uint64 types are returned as a
      # String instead of a Fixnum.  This method deals with that for now.
      #####################################################################
      def self.convert(str)
         return nil if str.nil? # Return nil,not 0
         return str.to_i
      end
   end
end

ProcTable.ps{ |p|
  puts p.pid.to_s if p.comm=='explorer.exe'
}

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