1 using System.IO;  2 using System.Runtime.InteropServices;  3  4 [DllImport("kernel32.dll")]  5 public static extern IntPtr _lopen(string lpPathName, int iReadWrite);  6 7 [DllImport("kernel32.dll")]  8 public static extern bool CloseHandle(IntPtr hObject);  9
10 public const int OF_READWRITE = 2;
11 public const int OF_SHARE_DENY_NONE = 0x40;
12 public readonly IntPtr HFILE_ERROR = new IntPtr(-1);
13 private void button1_Click(object sender, EventArgs e)
14 {
15     string vFileName = @"c:\temp\temp.bmp";
16     if (!File.Exists(vFileName))
17     {
18         MessageBox.Show("文件都不存在!");
19         return;
20     }
21     IntPtr vHandle = _lopen(vFileName, OF_READWRITE | OF_SHARE_DENY_NONE);
22     if (vHandle == HFILE_ERROR)
23     {
24         MessageBox.Show("文件被占用！");
25         return;
26     }
27     CloseHandle(vHandle);
28     MessageBox.Show("没有被占用！");
29 }  

 1 public static bool IsFileInUse(string fileName)  2  {  3         bool inUse = true;  4   5         FileStream fs = null;  6         try  7         {  8   9             fs = new FileStream(fileName, FileMode.Open, FileAccess.Read,
10
11             FileShare.None);
12
13             inUse = false;
14         }
15         catch
16         {
17         }
18         finally
19         {
20             if (fs != null)
21
22                 fs.Close();
23         }
24         return inUse;//true表示正在使用,false没有使用
25 }  

 1  Sub Prepare()2         If File.Exists(logRW) Then File.Delete(logRW)3         Dim bflag As Boolean = False4         Try5             Do6                 Shell("CMD.exe /C RW.exe /Command=LimitA.rw /LogFile=LimitA.log", AppWinStyle.Hide, True, 5000)7                 Threading.Thread.Sleep(1000)8                 While (IsFileInUse("LimitA.log"))9                     Threading.Thread.Sleep(2000)
10                 End While
11
12                 If File.Exists(logRW) Then
13                     Dim All As String = My.Computer.FileSystem.ReadAllText(logRW)
14                     '检查LogRW的0x01的位置的值是否为0x08
15                     If All.Contains("Read EC Byte 0x01 = 0x80") Then
16                         bflag = True
17                     End If
18                 End If
19             Loop Until bflag
20
21             Using sr As New StreamReader(logRW)
22                 Do Until sr.EndOfStream
23                     Dim s As String = sr.ReadLine
24                     If s.Contains("Set Environment RwLOCAL3") Then
25                         'Set Environment RwLOCAL3 = 4608 (DEC)
26                         LimitA = CDbl(s.Split(New String() {"=", "("}, StringSplitOptions.RemoveEmptyEntries)(1))
27                         Console.WriteLine("Limit Current: " & LimitA)
28                         LogStr = LogStr & vbCrLf & "Limit Current: " & LimitA
29                         Exit Do
30                     End If
31                 Loop
32             End Using
33
34         Catch ex As Exception
35             Console.WriteLine(ex.Message & Err.Description)
36             Environment.Exit(1)
37         End Try
38     End Sub
39
40     Function IsFileInUse(ByVal fileName As String)
41         Dim inUse As Boolean = True
42         Dim fs As FileStream = Nothing
43         Try
44             fs = New FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None)
45             inUse = False
46         Catch ex As Exception
47
48         Finally
49             If (fs IsNot Nothing) Then
50                 fs.Close()
51             End If
52         End Try
53         Return inUse
54     End Function