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在Python中查询块设备文件的大小(Query size of block device file in Python)

 我有一个Python脚本，用于读取标记不可读扇区的文件（通常来自光学介质），以允许重新尝试在不同的光学读取器上读取所述不可读的扇区。  
 我发现我的脚本不适用于块设备（例如/ dev / sr0），以便创建包含的ISO9660 / UDF文件系统的副本，因为os.stat().st_size为零。 该算法目前需要预先了解文件大小; 我可以改变这一点，但是（知道块设备大小的）问题依然存在，并且在这里没有回答，所以我打开这个问题。  
 我知道以下两个相关的SO问题：  
 
  确定块设备的大小 （/ proc / partitions，通过ctypes的ioctl）  
  如何检查在Python中的文件大小？ （关于非特殊文件）  
 
 因此，我问：在Python中，如何获取块设备文件的文件大小？ 

I have a Python script that reads a file (typically from optical media) marking the unreadable sectors, to allow a re-attempt to read said unreadable sectors on a different optical reader. 
I discovered that my script does not work with block devices (e.g. /dev/sr0), in order to create a copy of the contained ISO9660/UDF filesystem, because os.stat().st_size is zero. The algorithm currently needs to know the filesize in advance; I can change that, but the issue (of knowing the block device size) remains, and it's not answered here, so I open this question. 
I am aware of the following two related SO questions: 
 
 Determine the size of a block device (/proc/partitions, ioctl through ctypes) 
 how to check file size in python? (about non-special files) 
 
Therefore, I'm asking: in Python, how can I get the file size of a block device file?

原文：https://stackoverflow.com/questions/2773604

更新时间：2022-02-03 12:02

最满意答案

   public class Users
        {
             public string Email { get; set; }
public string UserName { get; set; }
public string DisplayName { get; set; }
public bool isMapped { get; set; }


        }



 try
{

    string DomainPath = "";
    DirectoryEntry searchRoot = new DirectoryEntry(DomainPath); 
    DirectorySearcher search = new DirectorySearcher(searchRoot);
    search.Filter = "(&(objectClass=user)(objectCategory=person))";
    search.PropertiesToLoad.Add("samaccountname");
    search.PropertiesToLoad.Add("mail");
    search.PropertiesToLoad.Add("usergroup");
    search.PropertiesToLoad.Add("displayname");

    SearchResult result;
    SearchResultCollection resultCol = search.FindAll();
    if (resultCol != null)
    {
        for (int counter = 0; counter < resultCol.Count; counter++)
        {
            string UserNameEmailString = string.Empty;
            result = resultCol[counter];
            if (result.Properties.Contains("samaccountname") && 
                     result.Properties.Contains("mail") && 
                result.Properties.Contains("displayname"))
            {
                Users objSurveyUsers = new Users();
                objSurveyUsers.Email = (String)result.Properties["mail"][0];
                objSurveyUsers.UserName = (String)result.Properties["samaccountname"][0];
                objSurveyUsers.DisplayName = (String)result.Properties["displayname"][0];

                lstADUsers.Add(objSurveyUsers);
            }
        }
    }

}
catch (Exception ex)
{

}

   public class Users
        {
             public string Email { get; set; }
public string UserName { get; set; }
public string DisplayName { get; set; }
public bool isMapped { get; set; }


        }



 try
{

    string DomainPath = "";
    DirectoryEntry searchRoot = new DirectoryEntry(DomainPath); 
    DirectorySearcher search = new DirectorySearcher(searchRoot);
    search.Filter = "(&(objectClass=user)(objectCategory=person))";
    search.PropertiesToLoad.Add("samaccountname");
    search.PropertiesToLoad.Add("mail");
    search.PropertiesToLoad.Add("usergroup");
    search.PropertiesToLoad.Add("displayname");

    SearchResult result;
    SearchResultCollection resultCol = search.FindAll();
    if (resultCol != null)
    {
        for (int counter = 0; counter < resultCol.Count; counter++)
        {
            string UserNameEmailString = string.Empty;
            result = resultCol[counter];
            if (result.Properties.Contains("samaccountname") && 
                     result.Properties.Contains("mail") && 
                result.Properties.Contains("displayname"))
            {
                Users objSurveyUsers = new Users();
                objSurveyUsers.Email = (String)result.Properties["mail"][0];
                objSurveyUsers.UserName = (String)result.Properties["samaccountname"][0];
                objSurveyUsers.DisplayName = (String)result.Properties["displayname"][0];

                lstADUsers.Add(objSurveyUsers);
            }
        }
    }

}
catch (Exception ex)
{

}

在Python中查询块设备文件的大小(Query size of block device file in Python)

最满意答案

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