JPH04247573A - Backup picture retrieving system - Google Patents

Abstract

PURPOSE:To immediately output a backup picture required for a user terminal and to reduce a communication tariff for obtaining the backup picture as well. CONSTITUTION:An input data interface 16 receives a backup request designating a backup picture number from a user terminal 11. A relative picture number retrieving means 17 retrieves a backup picture number table in a storage area 19 according to the backup picture number. A batch backup picture table updating means 18 updates the required picture number storage area of the backup picture table.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backward screen search method, and more particularly to a backward screen search method for a two-way image information communication system, which is a videotex system in which a specific user or a plurality of users can obtain necessary screens in a conversational manner.

0002

2. Description of the Related Art FIG. 3 is a flowchart showing an example of a conventional backward screen search method.

As shown in FIG. 3, in the conventional backward screen search method, a backward screen request is received from a user terminal, and the screen number search means 31 searches the backward screen number table in the storage area.
Referring to the screen number in the second screen number storage area, the screen calling means 22 stores the screen data from the screen file in the storage area, and the backward screen number table updating means 33 updates the backward screen number table. The second screen number storage area to the last screen number storage area are stored in descending order from the first screen number storage area of the backward screen number table, and the screen data on the storage area is output to the user terminal.

0004

[Problems to be Solved by the Invention] The conventional backward screen search method described above calls and outputs the screen that was output one screen before the currently output screen. has the disadvantage that it is necessary to make multiple retreat requests from the user terminal.

[0005]

[Means for Solving the Problems] The backward screen search method of the present invention includes a screen file that stores screens, a control unit that reads the stored screens onto a storage area, and an input that receives data from a user terminal. In a two-way image information communication system having a control unit and an output control unit that outputs a screen on a storage area to the user terminal, the system performs a retreat based on a retreat request having a designation of the number of retreat screens input from the user terminal. a screen number relative search means for searching a specified screen number from a screen number table; a backward screen number table batch update means for updating a necessary screen number storage area in the backward screen number table; and a backward request having a backward screen number specification. and an input data interface for receiving the input data.

[0006]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the backward screen search method of the present invention.

Referring to FIG. 1, in this embodiment, a control section 1
3, an input control section 12 and an output control section 14 connected to the user terminal 11, and a screen file 15, and the control section 13 has an input interface 16, a screen number relative search means 17, and a backward screen number table. Bulk update means 18
and a storage area 19.

FIG. 2 is a diagram showing an example of the contents of the storage area 19 of this embodiment.

As shown in FIG. 2, the storage area 19 includes a screen 21 that is read from the screen file 15 and stored, and a backward screen number table 22 that stores the screen numbers of the screens output to the user terminal 11 in descending order. , and a next output screen number 23 in which the screen number of the next screen to be output is stored.

First, the backward screen number table 22 in the storage area 19 initially stores character data "FFFFFFFFFFFF" in all the screen number storage areas.
” is stored, and the screen numbers of screens subsequently output to the user terminal 11 are stored in descending order starting from the first screen number storage area.

[0012] Therefore, the input control unit 12
A retreat request specifying the number of backward screens is received from 1 and given to the control unit 13.

Then, in the control unit 13, the input interface 16 receives the screen number relative search means 17, and the screen number relative retrieval means 17 searches for the backward request for the backward request from the first screen number storage area of the backward screen number table 22 in the storage area 19. The screen number in the screen number storage area at the position indicated by the number of screens is referred to, and if the screen number is valid, it is stored in the next output screen number 23 on the storage area 19, and if not, it is sent to the user terminal 11. Notify that the screen number does not exist. Also, if the screen number is valid, based on the next output screen number 23 on the storage area 19,
Screen data from the screen file 15 is stored on the screen 21.

Further, the backward screen number table batch updating means 18 stores valid screen numbers in descending order from the screen number storage area in which the next output screen number 23 of the backward screen number table 22 in the storage area 19 is stored. The screen number storage areas that are displayed are stored in descending order from the first screen number storage area of the backward screen number table 22, and the subsequent screen number storage areas are filled with character data “FFFF” indicating that they are not screen numbers.
FFFFFFFF” is stored.Finally, the output control unit 14
outputs the screen 21 on the storage area 19 to the user terminal 11.

[0015]

[Effects of the Invention] As explained above, the backward screen search method of the present invention allows the number of backward screens to be specified in a backward request in a two-way image information communication system, so that necessary backward screens are immediately output to the user terminal. This also has the effect of reducing communication charges for user terminals for obtaining the backward screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a backward screen search method of the present invention.

FIG. 2 is a diagram showing an example of the contents of a storage area 19 in this embodiment.

FIG. 3 is a flowchart illustrating an example of a conventional backward screen search method.

[Explanation of symbols]

11 User terminal 12 Input control section 13 Control section 14 Output control section 15 Screen file 16 Input data interface 17
Screen number relative search means 18 Backward screen number table batch update means 19
storage area

Claims (1)

[Claims] [Claim 1] A screen file storing screens;
A two-way image information communication system having a control unit that reads accumulated screens onto a storage area, an input control unit that receives data from a user terminal, and an output control unit that outputs the screens on the storage area to the user terminal. a screen number relative search means for searching a specified screen number from a backward screen number table based on a backward request having a backward screen number specification inputted from the user terminal; and a screen number relative search means for searching a specified screen number from a backward screen number table; A backward screen search method comprising: backward screen number table batch updating means for updating a storage area; and an input data interface that receives a backward request having a backward screen number specification.