C#中利用CreateToolhelp32Snapshot遍歷系統進程

        private void button1_Click(object sender, EventArgs e)
        {
           
            IntPtr handle=CreateToolhelp32Snapshot(0x2, 0);
            if ((int)handle > 0)
            {
                ProcessEntry32 pe32 = new ProcessEntry32();
                pe32.dwSize = (uint)Marshal.SizeOf(pe32);
                int bMore = Process32First(handle, ref pe32);
                while (bMore == 1)
                {
                    IntPtr temp = Marshal.AllocHGlobal((int)pe32.dwSize);
                    Marshal.StructureToPtr(pe32, temp, true);
                    ProcessEntry32 pe=(ProcessEntry32)Marshal.PtrToStructure(temp, typeof(ProcessEntry32));
                    Marshal.FreeHGlobal(temp);
                    list.Add(pe);
                    bMore = Process32Next(handle, ref pe32);
                }
                CloseHandle(handle);
                foreach(ProcessEntry32 p in list)
                    richTextBox1.AppendText(p.szExeFile+"/r/n");
            }
        }
        [DllImport("KERNEL32.DLL ")]
        public static extern IntPtr CreateToolhelp32Snapshot(uint flags, uint processid);
        [DllImport("KERNEL32.DLL ")]
        public static extern int CloseHandle(IntPtr handle);
        [DllImport("KERNEL32.DLL ")]
        public static extern int Process32First(IntPtr handle, ref   ProcessEntry32 pe);
        [DllImport("KERNEL32.DLL ")]
        public static extern int Process32Next(IntPtr handle, ref   ProcessEntry32 pe);
    }

=========================================================================
    [StructLayout(LayoutKind.Sequential)]
    public   struct   ProcessEntry32
    {
    public   uint   dwSize;
    public   uint   cntUsage;
    public   uint   th32ProcessID;
    public   IntPtr   th32DefaultHeapID;
    public   uint   th32ModuleID;
    public   uint   cntThreads;
    public   uint   th32ParentProcessID;
    public   int   pcPriClassBase;
    public   uint   dwFlags;

    [MarshalAs(UnmanagedType.ByValTStr,   SizeConst=260)]  
    public   string   szExeFile;
    };
}