我希望使用C＃解析WebCacheV01.dat文件，以便在Internet浏览器中找到上传的最后一个文件位置。
％LOCALAPPDATA％\微软\的Windows \的WebCache \ WebCacheV01.dat
我使用Managed Esent nuget包。
当我尝试运行以下代码时，它失败了：
Api.JetGetDatabaseFileInfo(filePath, out pageSize, JET_DbInfo.PageSize);
或者如果我使用
Api.JetSetSystemParameter(instance, JET_SESID.Nil, JET_param.CircularLog, 1, null);
在
Api.JetAttachDatabase(sesid, filePath, AttachDatabaseGrbit.ReadOnly);
我收到以下错误：
未处理的类型异常 发生了'Microsoft.Isam.Esent.Interop.EsentFileAccessDeniedException' 在Esent.Interop.dll
其他信息：无法访问文件，文件被锁定或正在使用
string localAppDataPath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
string filePathExtra = @"\Microsoft\Windows\WebCache\WebCacheV01.dat";
string filePath = string.Format("{0}{1}", localAppDataPath, filePathExtra);
JET_INSTANCE instance;
JET_SESID sesid;
JET_DBID dbid;
JET_TABLEID tableid;
String connect = "";
JET_SNP snp;
JET_SNT snt;
object data;
int numInstance = 0;
JET_INSTANCE_INFO [] instances;
int pageSize;
JET_COLUMNDEF columndef = new JET_COLUMNDEF();
JET_COLUMNID columnid;
Api.JetCreateInstance(out instance, "instance");
Api.JetGetDatabaseFileInfo(filePath, out pageSize, JET_DbInfo.PageSize);
Api.JetSetSystemParameter(JET_INSTANCE.Nil, JET_SESID.Nil, JET_param.DatabasePageSize, pageSize, null);
//Api.JetSetSystemParameter(instance, JET_SESID.Nil, JET_param.CircularLog, 1, null);
Api.JetInit(ref instance);
Api.JetBeginSession(instance, out sesid, null, null);
//Do stuff in db
Api.JetEndSession(sesid, EndSessionGrbit.None);
Api.JetTerm(instance);
如果不进行修改，是否无法阅读？
查看器
http://www.nirsoft.net/utils/ese_database_view.html
的Python
答案 0 :(得分：1)
我无法得到亚当的工作答案。对我有用的是使用AlphaVSS（一个.NET类库，具有用于卷影复制服务的托管API的副本）进行复制。该文件处于“脏关机”状态，因此我另外编写了此文件来处理打开它时引发的异常：
catch (EsentErrorException ex)
{ // Usually after the database is copied, it's in Dirty Shutdown state
// This can be verified by running "esentutl.exe /Mh WebCacheV01.dat"
logger.Info(ex.Message);
switch (ex.Error)
{
case JET_err.SecondaryIndexCorrupted:
logger.Info("Secondary Index Corrupted detected, exiting...");
Api.JetTerm2(instance, TermGrbit.Complete);
return false;
case JET_err.DatabaseDirtyShutdown:
logger.Info("Dirty shutdown detected, attempting to recover...");
try
{
Api.JetTerm2(instance, TermGrbit.Complete);
Process.Start("esentutl.exe", "/p /o " + newPath);
Thread.Sleep(5000);
Api.JetInit(ref instance);
Api.JetBeginSession(instance, out sessionId, null, null);
Api.JetAttachDatabase(sessionId, newPath, AttachDatabaseGrbit.None);
}
catch (Exception e2)
{
logger.Info("Could not recover database " + newPath + ", will try opening it one last time. If that doesn't work, try using other esentutl commands", e2);
}
break;
}
}
答案 1 :(得分：0)
该文件可能正在使用中。
要释放锁定的文件，请停止计划任务 - \ Microsoft \ Windows \ Wininet \ CacheTask 。
public override IEnumerable<string> GetBrowsingHistoryUrls(FileInfo fileInfo)
{
var fileName = fileInfo.FullName;
var results = new List<string>();
try
{
int pageSize;
Api.JetGetDatabaseFileInfo(fileName, out pageSize, JET_DbInfo.PageSize);
SystemParameters.DatabasePageSize = pageSize;
using (var instance = new Instance("Browsing History"))
{
var param = new InstanceParameters(instance);
param.Recovery = false;
instance.Init();
using (var session = new Session(instance))
{
Api.JetAttachDatabase(session, fileName, AttachDatabaseGrbit.ReadOnly);
JET_DBID dbid;
Api.JetOpenDatabase(session, fileName, null, out dbid, OpenDatabaseGrbit.ReadOnly);
using (var tableContainers = new Table(session, dbid, "Containers", OpenTableGrbit.ReadOnly))
{
IDictionary<string, JET_COLUMNID> containerColumns = Api.GetColumnDictionary(session, tableContainers);
if (Api.TryMoveFirst(session, tableContainers))
{
do
{
var retrieveColumnAsInt32 = Api.RetrieveColumnAsInt32(session, tableContainers, columnIds["ContainerId"]);
if (retrieveColumnAsInt32 != null)
{
var containerId = (int)retrieveColumnAsInt32;
using (var table = new Table(session, dbid, "Container_" + containerId, OpenTableGrbit.ReadOnly))
{
var tableColumns = Api.GetColumnDictionary(session, table);
if (Api.TryMoveFirst(session, table))
{
do
{
var url = Api.RetrieveColumnAsString(
session,
table,
tableColumns["Url"],
Encoding.Unicode);
var downloadedFileName = Api.RetrieveColumnAsString(
session,
table,
columnIds2["Filename"]);
if(string.IsNullOrEmpty(downloadedFileName)) // check for download history only.
continue;
// Order by access Time to find the last uploaded file.
var accessedTime = Api.RetrieveColumnAsInt64(
session,
table,
columnIds2["AccessedTime"]);
var lastVisitTime = accessedTime.HasValue ? DateTime.FromFileTimeUtc(accessedTime.Value) : DateTime.MinValue;
results.Add(url);
}
while (Api.TryMoveNext(session, table.JetTableid));
}
}
}
} while (Api.TryMoveNext(session, tableContainers));
}
}
}
}
}
catch (Exception ex)
{
// log goes here....
}
return results;
}
任务计划程序包装器
您可以使用Microsoft.Win32.TaskScheduler.TaskService Wrapper使用c＃停止它，只需添加此Nuget包[nuget]：https://taskscheduler.codeplex.com/
public static FileInfo CopyLockedFileRtl(DirectoryInfo directory, FileInfo fileInfo, string remoteEndPoint)
{
FileInfo copiedFileInfo = null;
using (var ts = new TaskService(string.Format(@"\\{0}", remoteEndPoint)))
{
var task = ts.GetTask(@"\Microsoft\Windows\Wininet\CacheTask");
task.Stop();
task.Enabled = false;
var byteArray = FileHelper.ReadOnlyAllBytes(fileInfo);
var filePath = Path.Combine(directory.FullName, "unlockedfile.dat");
File.WriteAllBytes(filePath, byteArray);
copiedFileInfo = new FileInfo(filePath);
task.Enabled = true;
task.Run();
task.Dispose();
}
return copiedFileInfo;
}
答案 2 :(得分：-1)
我正在考虑使用＆＃39;最近的项目＆＃39;选择要上传条目的文件时的文件夹写在此处：
C：\用户\ USER \应用程序数据\漫游\微软\的Windows \最近
string recent = (Environment.GetFolderPath(Environment.SpecialFolder.Recent));