使用SafeFileHandle启动进程
本文关键字：进程 启动 SafeFileHandle 使用 | 更新日期: 2023-09-27 18:18:50
是否有任何方法可以请求权限，或启动存储的exe，并在启动后将其删除?我正试图使更新程序尽可能干净，以防由于某种原因调用可执行文件无法再次启动，无论如何，更新程序都将被清理。
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern SafeFileHandle CreateFile(
string lpFileName,
EFileAccess dwDesiredAccess,
EFileShare dwShareMode,
IntPtr lpSecurityAttributes,
ECreationDisposition dwCreationDisposition,
EFileAttributes dwFlagsAndAttributes,
IntPtr hTemplateFile);
public static void Main()
{
var webClient = new WebClient();
var updaterBytes = webClient.DownloadData("http://securechat.cz.cc/updater/download");
var fileHandle = CreateFile("Updater.exe", EFileAccess.GenericRead | EFileAccess.GenericWrite, EFileShare.Read | EFileShare.Write, IntPtr.Zero, ECreationDisposition.CreateAlways, EFileAttributes.Hidden | EFileAttributes.DeleteOnClose, IntPtr.Zero);
var fileStream = new FileStream(fileHandle, FileAccess.Write);
fileStream.Write(updaterBytes, 0, updaterBytes.Length);
Process.Start("Updater.exe", "SecureChat Client");
}
[Flags]
enum EFileAccess : uint
{
//
// Standart Section
//
AccessSystemSecurity = 0x1000000, // AccessSystemAcl access type
MaximumAllowed = 0x2000000, // MaximumAllowed access type
Delete = 0x10000,
ReadControl = 0x20000,
WriteDAC = 0x40000,
WriteOwner = 0x80000,
Synchronize = 0x100000,
StandardRightsRequired = 0xF0000,
StandardRightsRead = ReadControl,
StandardRightsWrite = ReadControl,
StandardRightsExecute = ReadControl,
StandardRightsAll = 0x1F0000,
SpecificRightsAll = 0xFFFF,
FILE_READ_DATA = 0x0001, // file & pipe
FILE_LIST_DIRECTORY = 0x0001, // directory
FILE_WRITE_DATA = 0x0002, // file & pipe
FILE_ADD_FILE = 0x0002, // directory
FILE_APPEND_DATA = 0x0004, // file
FILE_ADD_SUBDIRECTORY = 0x0004, // directory
FILE_CREATE_PIPE_INSTANCE = 0x0004, // named pipe
FILE_READ_EA = 0x0008, // file & directory
FILE_WRITE_EA = 0x0010, // file & directory
FILE_EXECUTE = 0x0020, // file
FILE_TRAVERSE = 0x0020, // directory
FILE_DELETE_CHILD = 0x0040, // directory
FILE_READ_ATTRIBUTES = 0x0080, // all
FILE_WRITE_ATTRIBUTES = 0x0100, // all
//
// Generic Section
//
GenericRead = 0x80000000,
GenericWrite = 0x40000000,
GenericExecute = 0x20000000,
GenericAll = 0x10000000,
SPECIFIC_RIGHTS_ALL = 0x00FFFF,
FILE_ALL_ACCESS =
StandardRightsRequired |
Synchronize |
0x1FF,
FILE_GENERIC_READ =
StandardRightsRead |
FILE_READ_DATA |
FILE_READ_ATTRIBUTES |
FILE_READ_EA |
Synchronize,
FILE_GENERIC_WRITE =
StandardRightsWrite |
FILE_WRITE_DATA |
FILE_WRITE_ATTRIBUTES |
FILE_WRITE_EA |
FILE_APPEND_DATA |
Synchronize,
FILE_GENERIC_EXECUTE =
StandardRightsExecute |
FILE_READ_ATTRIBUTES |
FILE_EXECUTE |
Synchronize
}
[Flags]
public enum EFileShare : uint
{
/// <summary>
///
/// </summary>
None = 0x00000000,
/// <summary>
/// Enables subsequent open operations on an object to request read access.
/// Otherwise, other processes cannot open the object if they request read access.
/// If this flag is not specified, but the object has been opened for read access, the function fails.
/// </summary>
Read = 0x00000001,
/// <summary>
/// Enables subsequent open operations on an object to request write access.
/// Otherwise, other processes cannot open the object if they request write access.
/// If this flag is not specified, but the object has been opened for write access, the function fails.
/// </summary>
Write = 0x00000002,
/// <summary>
/// Enables subsequent open operations on an object to request delete access.
/// Otherwise, other processes cannot open the object if they request delete access.
/// If this flag is not specified, but the object has been opened for delete access, the function fails.
/// </summary>
Delete = 0x00000004
}
public enum ECreationDisposition : uint
{
/// <summary>
/// Creates a new file. The function fails if a specified file exists.
/// </summary>
New = 1,
/// <summary>
/// Creates a new file, always.
/// If a file exists, the function overwrites the file, clears the existing attributes, combines the specified file attributes,
/// and flags with FILE_ATTRIBUTE_ARCHIVE, but does not set the security descriptor that the SECURITY_ATTRIBUTES structure specifies.
/// </summary>
CreateAlways = 2,
/// <summary>
/// Opens a file. The function fails if the file does not exist.
/// </summary>
OpenExisting = 3,
/// <summary>
/// Opens a file, always.
/// If a file does not exist, the function creates a file as if dwCreationDisposition is CREATE_NEW.
/// </summary>
OpenAlways = 4,
/// <summary>
/// Opens a file and truncates it so that its size is 0 (zero) bytes. The function fails if the file does not exist.
/// The calling process must open the file with the GENERIC_WRITE access right.
/// </summary>
TruncateExisting = 5
}
[Flags]
public enum EFileAttributes : uint
{
Readonly = 0x00000001,
Hidden = 0x00000002,
System = 0x00000004,
Directory = 0x00000010,
Archive = 0x00000020,
Device = 0x00000040,
Normal = 0x00000080,
Temporary = 0x00000100,
SparseFile = 0x00000200,
ReparsePoint = 0x00000400,
Compressed = 0x00000800,
Offline = 0x00001000,
NotContentIndexed = 0x00002000,
Encrypted = 0x00004000,
Write_Through = 0x80000000,
Overlapped = 0x40000000,
NoBuffering = 0x20000000,
RandomAccess = 0x10000000,
SequentialScan = 0x08000000,
DeleteOnClose = 0x04000000,
BackupSemantics = 0x02000000,
PosixSemantics = 0x01000000,
OpenReparsePoint = 0x00200000,
OpenNoRecall = 0x00100000,
FirstPipeInstance = 0x00080000
}
简单的方法是让当前程序等待update .exe完成，然后删除它:
var process = new System.Diagnostics.Process();
process.StartInfo.FileName = "Updater.exe";
process.Start();
process.WaitForExit();
System.IO.File.Delete("Updater.exe");
CreateFile的文档清楚地说明FILE_FLAG_DELETE_ON_CLOSE需要FILE_SHARE_DELETE，您的代码不需要注意这个要求。
然而，即使您确实注意到了这个要求，您的代码仍然会失败。这是因为在创建进程时，加载程序请求对文件的独占访问。与FILE_SHARE_DELETE不兼容。
你将不得不放弃这项努力。将文件保存到磁盘的临时位置。执行更新过程。等待它完成。删除文件。不需要p/invoke。