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C# 判断一个文件是否正在被打开占用

2011-12-05 17:02:50| 分类： C#文件网络传输 | 标签： |举报 |字号大中小订阅

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方法1：打开看看就知道了

/// <summary>

/// 判断一个文件是否正在使用函数；打开看看就知道了

/// </summary>

/// <param name="fileName">将要判断文件的文件名</param>

/// <returns> bool</returns>

public static bool IsFileInUse(string fileName)
{
            bool inUse = true;
            if (File.Exists(fileName))
            {
                FileStream fs = null;
                try
                {
                    fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.None);
                    inUse = false;
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message.ToString());
                }
                finally
                {
                    if (fs != null)
                    {
                        fs.Close();
                    }
                }
                return inUse;           //true表示正在使用,false没有使用
            }
            else
            {
                return false;           //文件不存在则一定没有被使用
            }
}

方法2：调用VC库

using System.IO;
using System.Runtime.InteropServices;

[DllImport("kernel32.dll")]
public static extern IntPtr _lopen(string lpPathName, int iReadWrite);

[DllImport("kernel32.dll")]
public static extern bool CloseHandle(IntPtr hObject);

public const int OF_READWRITE = 2;
public const int OF_SHARE_DENY_NONE = 0x40;
public readonly IntPtr HFILE_ERROR = new IntPtr(-1);
private void button1_Click(object sender, EventArgs e)
{
    string vFileName = @"c:\temp\temp.bmp";
    if (!File.Exists(vFileName))
    {
        MessageBox.Show("文件都不存在，你就不要拿来耍了");
        return;
    }
    IntPtr vHandle = _lopen(vFileName, OF_READWRITE | OF_SHARE_DENY_NONE);
    if (vHandle == HFILE_ERROR)
    {
        MessageBox.Show("文件被占用！");
        return;
    }
    CloseHandle(vHandle);
    MessageBox.Show("没有被占用！");
}

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导航

日志

C# 判断一个文件是否正在被打开占用

历史上的今天

最近读者

热度

评论

页脚

天道酬勤 玩物丧志

导航

日志

C# 判断一个文件是否正在被打开占用

历史上的今天

最近读者

热度

评论

页脚

天道酬勤玩物丧志