天道酬勤玩物丧志

用勇气去改变可以改变的事情,用胸怀去包容无法改变的事情,用智慧去判断两者的区别

日志

关于我

yellowriver

嵌入式实时操作系统 ARM平台解决方案基础软件

文章分类

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

下载LOFTER 我的照片书 |

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！");
}

评论这张

转发至微博

阅读(4839)| 评论(2)

历史上的今天

this.p={  m:2,
              b:2,
              loftPermalink:'',
              id:'fks_087067080094081074093086080067072083086067080085084070083',
              blogTitle:'C# 判断一个文件是否正在被打开占用',
              blogAbstract:'  <DIV id=\"cnblogs_post_body\" \>  <P\>方法1：打开看看就知道了</P\>  <P\>/// <summary></P\>  <P\>/// 判断一个文件是否正在使用函数；打开看看就知道了</P\>/// </summary><BR\>  <P\>/// <param name=\"fileName\">将要判断文件的文件名</param></P\>  <P\>/// <returns> bool</returns></P\>  <DIV\>  <DIV id=\"cnblogs_code_open_12b48ff0-dc18-4eed-abed-061dfcb929a6\" style=\"DISPLAY: block;\"  jQuery=\"1\"  \>  <DIV\><FONT face=\"Courier New\"  \><SPAN style=\"COLOR: #0000ff;\"  \>public</SPAN\><SPAN style=\"COLOR: #000000;\"  \> </SPAN\><SPAN style=\"COLOR: #0000ff;\"  \>static</SPAN\><SPAN style=\"COLOR: #000000;\"  \> </SPAN\></FONT\></DIV\></DIV\></DIV\></DIV\>',
              blogTag:'',
              blogUrl:'blog/static/570432572011115525087',
              isPublished:1,
              istop:false,
              type:0,
              modifyTime:1323076605725,
              publishTime:1323075770087,
              permalink:'blog/static/570432572011115525087',
              commentCount:2,
              mainCommentCount:1,
              recommendCount:0,
              bsrk:-100,
              publisherId:0,
              recomBlogHome:false,
              currentRecomBlog:false,
              attachmentsFileIds:[],
              vote:{},
              groupInfo:{},
              friendstatus:'none',
              followstatus:'unFollow',
              pubSucc:'',
              visitorProvince:'',
              visitorCity:'',
              visitorNewUser:false,
              postAddInfo:{},
              mset:'000',
              mcon:'',
              srk:-100,
              remindgoodnightblog:false,
              isBlackVisitor:false,
              isShowYodaoAd:true,
              hostIntro:'嵌入式实时操作系统 ARM平台解决方案\n基础软件',
              hmcon:'1',
              selfRecomBlogCount:'0',
              lofter_single:'<iframe width="140" height="560" style="overflow:hidden;" src="http://www.lofter.com/mailEntry.do?blogad=1&blog" frameBorder="0"></iframe>'
            }

{list a as x}
    {if !!x}
    <div class="iblock nbw-fce nbw-f40">
      <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.visitorName}/">
      {if x.visitorName==visitor.userName}
      <img alt="${x.visitorNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.visitorName)}&r=${visitor.imageUpdateTime}"/>
      {else}
      <img alt="${x.visitorNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.visitorName)}"/>
      {/if}
      </a>
      <div class="cwd vname thide">
        {if x.moveFrom=='wap'}
          <a class="noul pnt" target="_blank" href="http://blog.163.com/services/wapblog.html?frompersonalbloghome"><span title="来自网易手机博客" class="iblock wapIcon"> </span></a>
        {elseif x.moveFrom=='iphone'}
          <a class="noul pnt" target="_blank"><span title="来自iPhone客户端" class="iblock iphoneIcon"> </span></a>
        {elseif x.moveFrom=='android'}
          <a class="noul pnt" target="_blank"><span title="来自Android客户端" class="iblock androidIcon"> </span></a>
        {elseif x.moveFrom=='mobile'}
          <a class="noul pnt" target="_blank" href="http://blog.163.com/services/emsblog.html?frompersonalbloghome"><span title="来自网易短信写博" class="iblock wapIcon"> </span></a>
        {/if}
        <a class="fc03 m2a"  target="_blank" hidefocus="true" href="http://blog.163.com/${x.visitorName}/">
          ${fn(x.visitorNickname,8)|escape}
        </a>
      </div>
    </div>
    {/if}
    {/list}

<#--最新日志，群博日志--> <#--推荐日志-->

<p class="fc06">推荐过这篇日志的人：</p>
    <div>
      {list a as x}
      {if !!x}
      <div class="iblock nbw-fce nbw-f40">
        <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.recommenderName}/">
        <img alt="${x.recommenderNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.recommenderName)}"/>
        </a>
        <div class="cwd thide">
          <a class="fc03 m2a" target="_blank" hidefocus="true" href="http://blog.163.com/${x.recommenderName}/">
            ${fn(x.recommenderNickname,6)|escape}
          </a>
        </div>
      </div>
      {/if}
      {/list}
    </div>
    {if !!b&&b.length>0}
    <p  class="fc06">他们还推荐了：</p>
    <ul>
    {list b as y}
      {if !!y}
        <li class="rrb"><span class="iblock">·</span><a class="fc03 m2a" target="_blank" href="http://blog.163.com/${y.recommendBlogPermalink}/?from=blog/static/570432572011115525087">${y.recommendBlogTitle|escape}</a></li>
      {/if}
    {/list}
    </ul>
    {/if}

<#--引用记录--> <#--博主推荐--> <#--随机阅读--> <#--首页推荐--> <#--历史上的今天--> <#--被推荐日志--> <#--上一篇，下一篇--> <#-- 热度 -->

{list a as x}
    {if !!x}
    <div class="hotItem iblock nbw-fce nbw-f40">
      <a class="fc03 noul" target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/">
      {if x.publisherUsername==visitor.userName}
      <img alt="${x.publisherNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.publisherUsername)}&r=${visitor.imageUpdateTime}"/>
      {else}
      <img alt="${x.publisherNickname|escape}" onerror="this.src=location.f40" class="cwd bdwa bdc0" src="${fn1(x.publisherUsername)}"/>
      {/if}
      </a>
      <div class="cwd vname thide">
        <a class="fc03 m2a"  target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/">
          ${fn(x.publisherNickname,8)|escape}
        </a>
      </div>
      <a class="f-myLikeIcons hottype {if x.type==1} js-liketype{elseif x.type==2} js-reblogtype{elseif x.type==3} js-sharetype{else}{/if}" target="_blank" hidefocus="true" href="http://blog.163.com/${x.publisherUsername}/"> </a>
    </div>
    {/if}
    {/list}

<#-- 网易新闻广告 --> <#--右边模块结构--> <#--评论模块结构--> <#--引用模块结构--> <#--博主发起的投票-->

页脚

我的照片书 - 手机博客 - 下载LOFTER APP - 订阅此博客

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

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