Question

我想编写一个函数来告诉我是否可以将文件/文件夹写入特定路径。我想这样做而不实际将任何文件写入磁盘。是否有WINAPI函数？谢谢你的帮助。

Answer 1

您可以使用GetFileSecurity()和AccessCheck()功能。阅读关于How to Check Access Rights的Aaron Ballman的文章。他提供CanAccessFolder()功能来完成你的要求。

Answer 2

function CheckFileAccess(const FileName: string; const CheckedAccess: Cardinal): Cardinal;
var Token: THandle;
    Status: LongBool;
    Access: Cardinal;
    SecDescSize: Cardinal;
    PrivSetSize: Cardinal;
    PrivSet: PRIVILEGE_SET;
    Mapping: GENERIC_MAPPING;
    SecDesc: PSECURITY_DESCRIPTOR;
begin
  Result := 0;
  GetFileSecurity(PChar(Filename), OWNER_SECURITY_INFORMATION or GROUP_SECURITY_INFORMATION or DACL_SECURITY_INFORMATION, nil, 0, SecDescSize);
  SecDesc := GetMemory(SecDescSize);

  if GetFileSecurity(PChar(Filename), OWNER_SECURITY_INFORMATION or GROUP_SECURITY_INFORMATION or DACL_SECURITY_INFORMATION, SecDesc, SecDescSize, SecDescSize) then
  begin
    ImpersonateSelf(SecurityImpersonation);
    OpenThreadToken(GetCurrentThread, TOKEN_QUERY, False, Token);
    if Token <> 0 then
    begin
      Mapping.GenericRead := FILE_GENERIC_READ;
      Mapping.GenericWrite := FILE_GENERIC_WRITE;
      Mapping.GenericExecute := FILE_GENERIC_EXECUTE;
      Mapping.GenericAll := FILE_ALL_ACCESS;

      MapGenericMask(Access, Mapping);
      PrivSetSize := SizeOf(PrivSet);
      AccessCheck(SecDesc, Token, CheckedAccess, Mapping, PrivSet, PrivSetSize, Access, Status);
      CloseHandle(Token);
      if Status then
        Result := Access;
    end;
  end;

  FreeMem(SecDesc, SecDescSize);
end;

你使用这个：如果（CheckFileAccess（SysteemGegevens.DFImportPath，FILE_ALL_ACCESS）＆lt;＆gt; FILE_ALL_ACCESS）那么

带

const
FILE_READ_DATA = $0001;
FILE_WRITE_DATA = $0002;
FILE_APPEND_DATA = $0004;
FILE_READ_EA = $0008;
FILE_WRITE_EA = $0010;
FILE_EXECUTE = $0020;
FILE_READ_ATTRIBUTES = $0080;
FILE_WRITE_ATTRIBUTES = $0100;
FILE_GENERIC_READ = (STANDARD_RIGHTS_READ or FILE_READ_DATA or
FILE_READ_ATTRIBUTES or FILE_READ_EA or SYNCHRONIZE);
FILE_GENERIC_WRITE = (STANDARD_RIGHTS_WRITE or FILE_WRITE_DATA or
FILE_WRITE_ATTRIBUTES or FILE_WRITE_EA or FILE_APPEND_DATA or SYNCHRONIZE);
FILE_GENERIC_EXECUTE = (STANDARD_RIGHTS_EXECUTE or FILE_READ_ATTRIBUTES or
FILE_EXECUTE or SYNCHRONIZE);
FILE_ALL_ACCESS = STANDARD_RIGHTS_REQUIRED or SYNCHRONIZE or $1FF;

获取文件系统限制

2 个答案: