Question about deleting files (moving them to the Recycle Bin)

[SteveTsai0113]

When using the Dokan library to mount a drive, how can files be moved to theRecycle Binwhen deleted via keyboard or right-click action within the mounted drive, instead of being permanently deleted?

This behavior should be similar to how Google Drive Client handles deletions on a desktop.

Dokan version: 2.2.1
memfs callback: CleanUp

[Liryna]

Hi @SteveTsai0113 , do you see calls for $Recycle.Bin ? There might be some right after the mount. If the implementation returns an error then it means, the drive isn't supporting the feature. In other words, the implementation has to fake and replicate the hierarchy behavior.

[SteveTsai0113]

Hi @Liryna, do you mean that createfile or other Api calls for $Recycle.Bin?

static NTSTATUS DOKAN_CALLBACK
memfs_createfile(LPCWSTR filename, PDOKAN_IO_SECURITY_CONTEXT security_context,
                 ACCESS_MASK desiredaccess, ULONG fileattributes,
                 ULONG /*shareaccess*/, ULONG createdisposition,
                 ULONG createoptions, PDOKAN_FILE_INFO dokanfileinfo) {
  auto filenodes = GET_FS_INSTANCE;
  ACCESS_MASK generic_desiredaccess;
  DWORD creation_disposition;
  DWORD file_attributes_and_flags;

  DokanMapKernelToUserCreateFileFlags(
      desiredaccess, fileattributes, createoptions, createdisposition,
      &generic_desiredaccess, &file_attributes_and_flags,
      &creation_disposition);

  auto filename_str = std::wstring(filename);
  memfs_helper::RemoveStreamType(filename_str);

  auto f = filenodes->find(filename_str);
  auto stream_names = memfs_helper::GetStreamNames(filename_str);

  spdlog::info(L"CreateFile: {} with node: {}", filename_str, (f != nullptr));

  // We only support filename length under 255.
  // See GetVolumeInformation - MaximumComponentLength
  if (stream_names.first.length() > 255) return STATUS_OBJECT_NAME_INVALID;

  // Windows will automatically try to create and access different system
  // directories.
  if (filename_str == L"\\System Volume Information" ||
      filename_str == L"\\$RECYCLE.BIN") {
    return STATUS_NO_SUCH_FILE;
  }
.....

[Liryna]

Correct. That's what I remember