JP2005020683A - File acquisition apparatus and file acquisition method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a file acquisition apparatus for acquiring all file identifiers without increasing bus traffic in communications even when memory capacity on a data receiving side is restricted or there are huge target files. <P>SOLUTION: The file acquisition apparatus comprises a means which requests the transmission of identifiers as many as a designated second number from a position which is offset just for a designated first number with a position of an identifier of a file first stored in a folder or of the folder as a criterion, to a second apparatus (2) with respect to an identifiers of files or the like within a directory specified with a first identifier, an identifier for identifying a file or the like of a folder being imparted to the file, a means for transmitting a first file identifier that is selected from a file identifier transmitted from the second apparatus in response to the request, and a file acquisition means for acquiring a file transmitted from the second apparatus in response to the transmission. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a technique for communicating between devices by communicating with each other, and more specifically, when the memory capacity on the data receiving side is limited or the number of target files is enormous. The present invention relates to a technique for transferring data by connecting devices directly.

  Conventionally, when data such as images taken with an electronic camera is to be recorded in an external large-capacity recording device, data such as images is transferred via a PC. However, a technique for transferring data by directly connecting an electronic camera and a recording device has been developed from the viewpoint of convenience of handling.

  As a disclosure technique in this field, a technique is known in which a detachable recording medium is provided in the camera itself, and imaging data is recorded on the recording medium (see, for example, Patent Document 1).

  FIG. 15 is a cross-sectional view showing the configuration of the camera system described in Patent Document 1.

  This camera system includes a camera 100 and a data recording device 101 mounted on a lens mount portion of the camera. The camera 100 reads the imaging data recorded on the recording medium 102 and records it on the detachable recording medium 104 via the signal terminal 103. According to the technique disclosed in Patent Document 1, it is possible to directly transfer data without using a PC.

As another disclosed technique, a technique in which an “USB storage class compliant” electronic camera and a magneto-optical disk drive device are directly connected and transferred to the magneto-optical disk drive device at the touch of a button is used (non-patented). Reference 1).
JP 2002-055388 A “New release of“ TURBO MO mini EX IV + ”, [online], October 16, 2002, Olympus, Internet [URL: http://www.olympus.co.jp/LineUp/Mo/MiniEX4/miniex4.html ]

  However, the invention disclosed in Patent Document 1 still has the following problems to be solved.

  Since this data recording apparatus is connected to a camera to enable data transfer, PTP (Picture Transfer Protocol) can be considered for the data communication. Details of this procedure are described in detail in "PIMA 15740: 2000 Photography-Electronic still picture imaging-Picture Transfer Protocol (PTP) for Digital Still Photography Devices", Photographic and Imaging Manufacturers Association, Inc.

  According to PTP, when a file is acquired, information called a file identifier (Object Handle) for specifying the file is transferred to the receiving side. However, the procedure when the amount of information to be transferred (number of files) is enormous or the receiving side has memory limitations is not particularly defined in PTP. Therefore, the receiving side may not receive all the transferred file identifiers.

  On the other hand, the performance of equipment related to data transfer is progressing steadily, and the data capacity handled by the equipment is rapidly increasing. In addition, devices having new functions have been developed, and the number of types of devices to which data is transferred is increasing. Under such circumstances, the fact that there is a limit on the number of data that can be transferred when following the standard procedure for data transfer between devices also hinders the use of the procedure.

  The present invention has been made in view of such circumstances, and increases the bus traffic during communication even when the memory capacity on the data receiving side is limited or the number of target files is enormous. An object of the present invention is to provide a file acquisition apparatus and a file acquisition method capable of acquiring all file identifiers.

  In order to solve the above-mentioned problem, a file acquisition apparatus according to claim 1 of the present invention is mounted in a first device and stored in a second device that directly connects to the first device. In the file acquisition apparatus for acquiring a file, an ordered unique identifier for identifying the file or folder is assigned to the file managed in the folder hierarchical structure, and is specified for the second device. The identifier of the file or folder in the folder specified by the first identifier is changed from the identifier of the position offset by the first number to be specified with reference to the position of the identifier of the file or folder initially stored in the folder. A file identifier requesting means for requesting extraction and transmission of the second number to be designated, and corresponding to the request from the file identifier requesting means In response to a request from the file requesting means, a file requesting means for sending a first file identifier selected from at least one file identifier sent from the second device to the second device, File acquisition means for acquiring a file corresponding to the first file identifier transmitted from the device.

  A file acquisition device according to claim 2 of the present invention is the file acquisition device according to the above-described invention, wherein the second device stores a file to be acquired with respect to the second device. Storage identifier specifying means for specifying a physical or logical address of the recording means.

  The file acquisition device according to claim 3 of the present invention is the file acquisition device according to the above-described invention, wherein the first device is any one of an electronic camera, a storage, a mobile terminal, a mobile phone, and a printer. One.

  According to a fourth aspect of the present invention, there is provided a file acquisition method for acquiring a file stored in a second device that is mounted on a first device and is directly signal-connected to the first device. In this file acquisition method, the file managed in the folder hierarchical structure is given an ordered unique identifier for identifying the file or folder, and is designated to the second device. The identifier of the file or folder in the folder specified by the identifier is specified from the identifier at the position offset by the first number to be specified with the position of the identifier of the file or folder stored first in the folder as a reference A file identifier requesting step for requesting extraction and transmission of the second number, and the request in the file identifier requesting step. In response to the request in the file request step for transmitting the first file identifier selected from the at least one file identifier transmitted from the second device to the second device, and the request in the file request step. And a file acquisition step of acquiring a file corresponding to the first file identifier transmitted from the second device.

  The file acquisition method according to claim 5 of the present invention is the file acquisition method according to the above-described invention, wherein the second device stores a file to be acquired with respect to the second device. A storage identifier designation step for designating a physical or logical address of the recording means.

  A file acquisition method according to a sixth aspect of the present invention is the file acquisition method according to the invention described above, wherein the first device is any one of an electronic camera, a storage, a mobile terminal, a mobile phone, and a printer. One.

  According to the file acquisition apparatus or the acquisition method of the present invention, even when the memory capacity on the data receiving side is limited or the number of target files is enormous, the bus traffic during communication is not increased. All file identifiers can be acquired.

  The file acquisition apparatus according to the present invention is used in a direct recording apparatus that enables devices to be directly connected to each other and handle data held by the devices.

  FIG. 1 is a diagram showing the aim of the direct recording apparatus.

  The direct recording device is mounted on an electronic camera 1 as a device and a storage 2 as a recording device. The electronic camera 1 and the storage 2 can handle data mutually without depending on the manufacturer and the model by the function of the direct recording device.

  However, the direct recording device is not used only in the combination shown in FIG. 1, but can be used in various combinations of devices. For example, the present invention can also be used in the following combinations described separately for the data sending side and the data receiving side. Therefore, the file acquisition apparatus according to the present invention can also be used in the following combinations.

(1) Sending side: electronic camera, receiving side: storage
(2) Sending side: Storage, receiving side: Electronic camera
(3) Sending side: electronic camera, receiving side: mobile phone (terminal)
(4) Sending side: mobile phone (terminal), receiving side: electronic camera
(5) Sending side: electronic camera, receiving side: printer
(6) Sending side: storage, receiving side: printer
FIG. 2 is a diagram showing a configuration of a direct recording system using a direct recording apparatus in which a file acquisition apparatus according to the present invention is incorporated.

  The direct recording system includes an electronic camera 1, a storage 2, and a communication line 3. The electronic camera 1 is provided with an imaging unit 5, a device recording medium 6, an operation unit 7, a display unit 8, a device communication interface 9, and a device control unit 11. The device control unit 11 includes a device direct recording unit 10, a device CPU 11a, a device file management unit 11b, and a device memory 11c.

  The imaging unit 5 captures an object to generate an imaging signal, and performs various image processing to create image data. The device recording medium 6 stores image data and the like created by the imaging unit 5. The operation unit 7 includes an operation switch for inputting an instruction regarding the operation of the electronic camera 1. The display unit 8 displays image data or a user interface screen. The device communication interface 9 is an interface that exchanges signals with the storage 2.

  The device direct recording means 10 is the above-described direct recording device incorporated in the device, and transfers and handles image data and the like with the storage 2. The device CPU 11a includes the operation of the device direct recording means 10, and comprehensively controls the operation of each part of the electronic camera. The device file management unit 11b is a file acquisition device according to the present invention incorporated in a device, and manages files including file identifiers in cooperation with the device direct recording means 10. The device memory 11c stores various data.

  The storage 2 is provided with a storage recording medium 15, a storage communication interface 16, and a storage control unit 18. The storage control unit 18 includes a storage direct recording unit 17, a storage CPU 18a, a storage file management unit 18b, and a storage memory 18c.

  The storage recording medium 15 stores image data and the like. The storage communication interface 16 is an interface that exchanges signals with the electronic camera 1. The storage direct recording unit 17 is the above-described direct recording device incorporated in the storage, and transfers and handles image data and the like with the electronic camera 1. The storage CPU 18a includes the operation of the storage direct recording means 17, and comprehensively controls the operation of each part of the storage. The storage file management unit 18b is a file acquisition apparatus according to the present invention incorporated in a storage, and manages files including file identifiers in cooperation with the storage direct recording unit 17. The storage memory 18c stores various data.

  Here, the communication line 3 is a path widely used for transmitting and receiving information, and is not limited to communication using a wire such as a conductive line or an optical fiber, but also includes wireless communication using light, sound waves, radio waves, and the like. .

  In the present direct recording system, the device direct recording means 10 provided in the electronic camera 1 and the storage direct recording means 17 provided in the storage 2 perform a coordinated operation by exchanging signals with each other, whereby image data and the like are stored. Transfer and handle.

  FIG. 3 is a diagram showing a protocol architecture of the direct recording apparatus.

  In FIG. 3, the function of each layer described in the electronic camera 1 corresponds to the configuration of the apparatus direct recording means 10, and the function of each layer described in the storage 2 corresponds to the configuration of the storage direct recording means 17. ing.

  As the physical communication layer, for example, a physical interface 21 such as a USB is provided. The transport layer includes a PTP transport layer 22. PTP (Picture Transfer Protocol) is a protocol mainly used for image transfer in an electronic camera. Note that the configuration of these layers is not limited to the above-described USB and PTP, and may be configured using known techniques as appropriate.

  A direct recording layer 24 for realizing direct recording and a direct recording discovery 23 as a software component are provided on the upper layer of the PTP transport layer 22. The application layer 25 that is the uppermost layer is provided with a first direct recording server 26 and a second direct recording client 27 that are software components on the electronic camera side, and a first direct recording client 28 and a second direct recording server 29. Is provided on the storage side.

  The direct recording discovery 23 negotiates whether or not a predetermined function is provided when the electronic camera 1 and the storage 2 perform direct recording.

  The first direct recording (server / client) supports a function of transferring image data of the electronic camera 1 to the storage 2. The first direct recording server 26 provided on the electronic camera 1 side provides data in response to a request from the first direct recording client 28 provided on the storage 2 side.

  The second direct recording (server / client) supports the function of transferring the image data in the storage 2 to the electronic camera 1 and the function of operating the image data in the storage. The second direct recording server 29 provided on the storage 2 side provides data in response to a request from the second direct recording client 27 provided on the electronic camera 1 side.

  The direct recording device has the following functions.

  Function 1: A function for preparing to perform operations such as data transfer between the electronic camera 1 and the storage 2.

  The preparation function defines a discovery operation for negotiating whether or not the electronic camera 1 and the storage 2 have a predetermined function for direct recording, and a configure operation for exchanging detailed information on each function. Has been.

  Function 2: A function of transferring image data in the electronic camera 1 to the storage 2 and storing it in the storage recording medium 15.

  As this function, a direct copy operation is defined.

  Function 3: A function of transferring image data in the storage 2 to the electronic camera 1 and displaying it on the display unit 8 or storing it in the device recording medium 6.

  As this function, a direct display operation is defined.

  Function 4: A function for operating files in the storage 2 from the electronic camera 1.

  This function defines image data copy / move operations within the storage, image data copy / move operations to other storage, image data delete operations within the storage, storage operations such as formatting, etc. Has been.

  Hereinafter, the operation of the file acquisition apparatus according to the present invention will be described based on the direct display operation of function 3.

[Direct display function]
First, the file identifier will be described. The file identifier is ID data for identifying an image data file or the like, and the direct recording apparatus sets a unique value for all files in the electronic camera 1. Therefore, the target file can be specified by this file identifier.

  FIG. 4 is a diagram for explaining a file identifier numbering method.

  In FIG. 4, folders 35a to 35n and files 38a to 38c are represented in a tree structure. Here, in the graphic representing each folder and file, the folder name or file name is shown in the upper row, and the file identifier is written in the lower row.

  In the direct recording device, numbers are consecutively assigned without distinguishing between folders and files based on this tree structure, and these are used as file identifiers. Therefore, according to this rule, the file identifiers of the folders 35a to 35b are "00000001" to "00000002", the file identifiers of the files 38a to 38c are "00000003" to "00000005", the file identifier of the folder 35c is "00000006", and so on. Become. Note that no file identifier is set for the temporary folder 36.

  FIG. 5 is a diagram showing a signal exchange flow of the direct display operation.

  This function is a function for transferring the image data in the storage 2 to the electronic camera 1 and displaying it on the display unit 8 or storing it in the device recording medium 6. This direct display operation is executed by exchanging signals between the second direct recording server 29 and the second direct recording client 27. Accordingly, the first direct recording server 26 and the first direct recording client 28 do not perform a signal transmission / reception operation.

  When the user selects a file display mode using the operation unit 7 of the electronic camera 1 and inputs the start of direct display, the second direct recording client 27 is activated and first requests a storage identifier from the storage 2. (S31).

  Here, the storage identifier is ID data for identifying the logical storage or physical storage of the storage 2, and a direct recording device sets a unique value for all the storages in the storage 2. Therefore, the target storage can be specified by this storage identifier.

  FIG. 6 is a diagram showing how to assign storage identifiers.

  The storage identifier is composed of eight digits, with the upper 4 digits representing the physical storage number and the lower 4 digits representing the logical storage number. A physical storage is a storage that exists as a physically separate device, and a logical storage is a storage that is virtually divided into a plurality of storages within the same device.

  In the example shown in FIG. 6, the physical storage number of the MO is “0001”, the physical storage number of the CD-R is “0002”, and the two logical storage numbers of the MO are “0001” and “0002”. A storage identifier is set from a physical storage number and a logical storage number.

  In the storage 2, the second direct recording server 29 transmits a storage identifier to the electronic camera 1 (S32). In the electronic camera 1 that has received the storage identifier, the second direct recording client 27 requests storage information for each storage identifier (S33).

  In the storage 2, the second direct recording server 29 edits the storage information and transmits the edited storage information to the electronic camera 1 (S34).

  Storage information edited by the second direct recording server 29 includes, for example, storage type, file system type (format format, etc.), access type (ROM, R / W, etc.), total storage capacity, free storage capacity, storage descriptor, For example, a volume label.

  The second direct recording client 27 that has received the storage information displays the storage information on the display unit 8 (S35). The user refers to this display and selects the storage to be displayed by the operation unit 7 (S36).

  This storage information display (S31 to S36) does not operate only in the direct display operation, and may operate, for example, when the electronic camera 1 and the storage 2 are connected.

  For example, when the storage 2 having the storage identifier of FIG. 6 is connected to the electronic camera 1, three pieces of storage information corresponding to the storage identifier are displayed on the display unit 8 of the electronic camera 1.

  As a result, not only that the storage is connected but also what logical or physical storage exists can be notified to the user, and the user can store the storage information displayed on the display unit 8 of the electronic camera 1. The desired storage can be easily selected based on the above.

  Next, the file identifier acquisition operation will be described with reference to the file configuration of the storage 2 shown in FIG.

  The second direct recording client 27 requests a list of file identifiers stored in the storage of the selected storage identifier (S37). Then, the second direct recording server 29 creates a list of corresponding file identifiers and transmits an answer to the electronic camera 1 (S38).

  In this file identifier acquisition operation, the device file management unit 11 b and the storage file management unit 18 b perform operations in cooperation with the device direct recording unit 10 and the storage direct recording unit 17, respectively. Even when the capacity is limited or the number of target files is enormous, all file identifiers can be acquired without increasing bus traffic during communication.

  FIG. 8 is a diagram showing in detail the signal transmission / reception flow of steps S37 and S38 which are file identifier acquisition operations.

  The second direct recording client 27 transmits request information for obtaining a file identifier existing in the root directory to the storage 2 (T01). FIG. 9 is a diagram showing file identifier request information.

  The request information includes parameters of “storage identifier”, “file type”, “file identifier of parent directory”, “offset”, and “maximum number of acquisitions”.

  “Storage identifier” describes information (storage identifier) that specifies which of the recording units on the sending side is accessed when the storage medium is logically divided. It should be noted that this parameter can be omitted when there is only one storage identifier. In “File type”, specify the file type of the file identifier to be acquired. For example, the file type can be specified by an extension such as folder, JPG, TXT, MPEG, WAV. Note that file types other than the designated file type are not subject to reply. If this parameter is not specified, all file types are targeted.

  In “parent folder file identifier”, the file identifier of the directory to be acquired is designated. If “0x00000000” (0x represents HEX expression, the same applies hereinafter) is designated here, it is handled as if the root folder was designated. In the “offset”, an offset value of the file identifier in the parent folder is specified. File identifiers after the specified offset value are to be acquired. “Maximum number of acquisitions” specifies the maximum number of file identifiers that can be acquired by the receiver. For example, it is possible to specify a number corresponding to the state on the receiving side, such as the maximum number that can be displayed or the limit number at which no omission occurs.

  According to the request information shown in FIG. 9, “maximum 50 files” are requested from “first” to “all file types” with “root folder” stored in “second recording unit” as a parent folder. .

  Therefore, the second direct recording server 29 transmits three identifiers “00000103”, “000000020”, and “000000020” as file identifiers to the electronic camera 1 (T02). At this time, the file type may be transmitted together with the file identifier.

  Further, before sending the file identifier, the file type stored on the sending side may be edited into the format shown in FIG. 10 and sent to the receiving side. By informing the receiving side of the file type, the selectable file type can be displayed on the display unit 8 on the receiving side. With this configuration, the receiving side does not request a file type that does not exist on the sending side, bus traffic can be reduced on the interface, and user operability is improved.

  The second direct recording client 27 that has received the file identifier requests the storage 2 for file information about the file identifier, displays the file information on the display unit 8, and the user refers to this display to display the target file. Alternatively, the folder can be selected by the operation unit 7.

  The second direct recording client 27 transmits request information for a file identifier existing in the subdirectory 1 to the storage 2 (T05). FIG. 11 is a diagram showing file identifier request information.

  According to the request information shown in FIG. 11, a request is made to request “all 50 file types” from “first” for “all file types” having the file identifier “0x00000103” stored in the “second recording unit” as a parent directory. Yes.

  Therefore, the second direct recording server 29 transmits “0x00000104” as the file identifier to the electronic camera 1 (T06).

  The second direct recording client 27 that has received the file identifier requests the storage 2 for file information regarding the file identifier, displays the received file information on the display unit 8 in the same manner as the previous time, and the user refers to this display. The target file or folder can be selected by the operation unit 7.

  The second direct recording client 27 transmits request information for a file identifier existing in the subdirectory 2 to the storage 2 (T09). FIG. 12 is a diagram showing file identifier request information.

  According to the request information shown in FIG. 12, “maximum 50 files” are requested from “first” to “JPG files” having the file identifier “0x00000104” stored in the “second recording unit” as a parent directory. .

  Therefore, the second direct recording server 29 transmits “0x00000105” to “0x000000015” as file identifiers to the electronic camera 1 (T10).

  The second direct recording client 27 that has received the file identifier selects any one file identifier from the received 50 file identifiers, and requests file information about the file identifier from the storage 2 (S39).

  In the storage 2, the second direct recording server 29 edits the file information about the file identifier and transmits it to the electronic camera 1 (S40). Here, the file information to be answered is, for example, a file name, a file size, a file attribute, a file creation date, a file update date, and the like.

  In the electronic camera 1, the second direct recording client 27 prepares to accept an image file based on the transmitted file information. In addition, the free space is checked from the file size to determine whether or not the file can be accepted. If it is acceptable, a file transfer is requested (S41).

  In the storage 2, the second direct recording server 26 transmits the file with the file identifier to the electronic camera 1 (S42).

  FIG. 14 is a diagram for explaining the file extraction operation. By specifying “00000105” as the file identifier from the electronic camera 1, the file name “P100001.JPG” is specified and transmitted.

  In the electronic camera 1, the file transmitted by the second direct recording client 27 is displayed on the display unit 8 (S43). At this time, the transmitted file may be stored in a predetermined area. When storing a file, the second direct recording client 27 sets a unique file identification number for the file.

  When the user designates the received 50 file identifiers outside the range by the operation unit 7, the user requests the storage 50 for the next 50 file identifiers.

  The second direct recording client 27 transmits request information for obtaining the file identifier of the next group existing in the subdirectory 2 to the storage 2 (T13). FIG. 13 is a diagram showing file identifier request information.

  According to the request information shown in FIG. 13, “maximum 50” requests from “first 51st” to “JPG files” having the file identifier “0x00000104” stored in the “second recording unit” as a parent directory are requested. is doing.

  Therefore, the second direct recording server 29 transmits “0x000000015” to “0x000000204” as file identifiers to the electronic camera 1 (T14). If there is no JPG file to be transmitted, the information transmitted to the electronic camera 1 may indicate that it is the final transmission. Further, the number of remaining cases may be described every time the electronic camera 1 is transmitted.

  The second direct recording client 27 that has received the file identifier displays the file in the same procedure as before (S39 to S43).

  The above procedure (S39 to S43) is repeatedly executed for each file identifier in accordance with a user instruction.

  In this file identifier acquisition method, since a “storage identifier” is provided in the request information parameter, if there are a plurality of recording units on the sending side, even if the storage medium is logically divided, the storage An identifier can be specified. In addition, since “offset” is provided in the request information parameter, combining with the “maximum number of acquisitions” may limit the memory capacity on the data receiving side or when the number of target files is enormous. However, all file identifiers can be acquired without increasing bus traffic during communication.

  In addition, since the above-described embodiments include various stages of the invention, various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

The figure which shows the aim of the direct recording device which concerns on this invention. The figure which shows the structure of the direct recording system using the direct recording apparatus incorporating the file acquisition apparatus which concerns on this invention. The figure which shows the protocol architecture of a direct recording device. The figure explaining the numbering method of a file identifier. The figure which shows the signal transfer flow of a direct display operation | movement. The figure which shows how to attach a storage identifier. The figure which shows the file structure of a storage. The figure which shows the signal transfer flow of file identifier acquisition operation | movement in detail. The figure which shows the request information of a file identifier. The figure which shows the reply information of a file identifier. The figure which shows the request information of a file identifier. The figure which shows the request information of a file identifier. The figure which shows the request information of a file identifier. The figure explaining operation | movement of taking out a file. Sectional drawing which shows the structure of a camera system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Electronic camera, 2 ... Storage, 3 ... Communication line, 6 ... Equipment recording medium, 7 ... Operation part, 8 ... Display part, 10 ... Equipment direct recording means, 11 ... Equipment control part, 11b ... Equipment file management part, DESCRIPTION OF SYMBOLS 15 ... Storage recording medium, 17 ... Storage direct recording means, 18 ... Storage control part, 18b ... Storage file management part, 21 ... Physical interface, 22 ... PTP transport layer, 23 ... Direct recording discovery, 24 ... Direct recording layer , 25 ... application layer, 26 ... first direct recording server, 27 ... second direct recording client, 28 ... first direct recording client, 29 ... second direct recording server, 35 ... folder, 38 ... file.

Claims (6)

In a file acquisition device that acquires a file that is stored in a second device that is mounted on a first device and that directly connects to the first device.
The files managed in the folder hierarchy are given unique ordered identifiers for identifying the files or folders,
A file or folder identifier in the folder specified by the first identifier to be specified is specified to the second device with reference to the position of the identifier of the file or folder stored first in the folder. File identifier requesting means for requesting to extract and transmit the second number to be specified from the identifier at the position offset by the first number;
In response to the request from the file identifier requesting means, a file requesting means for sending a first file identifier selected from at least one file identifier sent from the second device to the second device;
File acquisition means for acquiring a file corresponding to the first file identifier transmitted from the second device in response to the request of the file request means;
A file acquisition apparatus comprising:   A storage identifier designating unit for designating a physical or logical address of a recording unit of the second device in which a file to be acquired is stored for the second device. The file acquisition apparatus according to claim 1.   The file acquisition apparatus according to claim 1, wherein the first device is one of an electronic camera, a storage, a mobile terminal, a mobile phone, and a printer. In a file acquisition method of a file acquisition device that acquires a file stored in a second device that is mounted on a first device and is directly signal-connected to the first device,
The files managed in the folder hierarchy structure are given unique ordered identifiers for identifying the files or folders,
A file or folder identifier in the folder specified by the first identifier to be specified is specified to the second device with reference to the position of the identifier of the file or folder stored first in the folder. A file identifier requesting step for requesting to extract and transmit the second number to be specified from the identifier at the position offset by the first number;
In response to the request in the file identifier requesting step, a file requesting step of transmitting to the second device a first file identifier selected from at least one file identifier transmitted from the second device;
In response to the request in the file request step, a file acquisition step of acquiring a file corresponding to the first file identifier transmitted from the second device;
A file acquisition method comprising:   The storage device further comprises a storage identifier specifying step for specifying a physical or logical address of a recording unit of the second device in which a file to be acquired is stored for the second device. The file acquisition method according to claim 4.   The file acquisition method according to claim 1, wherein the first device is one of an electronic camera, a storage, a mobile terminal, a mobile phone, and a printer.

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