JPH04359330A - Film access history management system - Google Patents

Abstract

PURPOSE:To easily judge which files can be erased at the time of deleting several files out of many files resembling one another. CONSTITUTION:When a program is started (step 31), a program name 11A is retrieved to discriminate whether it is registered in file management information or not (step 32). If it is not registered, the program name 11A and an end identifier are additionally written in file management information (step 33). If read of a data file is instructed during program execution (step 34), the data file name is retrieved to discriminate whether it is registered in file management information or not. If it is not registered, the file name is written. The end identifier of the program name in file management information is retrieved, and 'R' and the address of the file name are written in an R/W discrimination 11B and a file pointer 11C based on the position of the end identifier (steps 35 to 37), and the end identifier is written (step 38 to 39).

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to files stored in an external storage medium used in an information processing apparatus, and more particularly to a file management system.

0002

[Prior Art] Conventionally, as a method for managing files,
The date and time the file was created and the last date and time were recorded.

0003

[Problems to be Solved by the Invention] In the conventional file management method described above, it is not possible to know which program created the file, whether it was used as input, or whether it was used as output. For this reason, for example, when attempting to delete a file, there is a drawback that it is impossible to know whether deletion is possible unless the contents of the file are checked.

0004

[Means for Solving the Problems] A file access history management method according to the present invention includes an external storage medium for recording programs and data files, and a storage medium for storing program names, file names and files read and written while the program is being executed. When a program is started, the non-volatile memory is searched to see if the started program exists, and if there is not, the non-volatile memory is stored. If a program name is added and a file is read or written during program execution, it is searched to see if the file exists in the non-volatile memory, and if it is not found, the file name is written to the non-volatile memory, and the file is read or written. The writing identification and a pointer indicating the address where the file name is stored are written into the nonvolatile memory.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described in more detail with reference to the drawings.

FIG. 1 is a schematic block diagram of one embodiment of the present invention. In this embodiment, the data processing device control section 1 controls the entire data processing device. The nonvolatile memory 2 is a memory that retains its contents even when the data processing device is powered off, and stores file management information 3 therein. The external storage medium 4 stores programs and data files.

Next, the operation of this embodiment will be explained with reference to FIGS. 2 to 4. First, program 11 is started (
Step 31) and search whether program name 11A is registered in file management information 3 (step 32)
. If not registered, the program name 11A and end identifier are added to the file management information 3 (step 33).

Next, when a data file reading instruction is given during program execution (step 34), the file management information 3 is searched to see if the data file name 21 exists. If it does not exist, write file name 21. Then, the end identifier of the program name 11A of the file management information 3 is searched, and from that position, "R" is entered in the R/W identification 11B (step 35), and the file name 21 is entered in the file pointer 11C.
(Steps 36-37) and an end identifier (Steps 38-39).

[0009] When a data file write instruction is given during program execution, the same processing as in the case of reading is performed, except that "W" is written in the R/W identifier.

Finally, when the program ends, the end identifier of the program 11A in the file management information 3 is searched, and the program end identifier and the end identifier are written from that position.

FIG. 4 shows the relationship between file access and file management information 3, and the relationship between file accesses can be confirmed on the display device 5.

0012

[Effects of the Invention] As explained above, the present invention allows checking the relationship between data files used in a program.
If there are many similar files and you want to delete some of them, you can easily determine which files can be deleted.

[0013] In particular, fixed external storage devices have recently become widespread, and it is often necessary to delete temporarily created files, etc., so the present invention is used in many situations.

Furthermore, by using non-volatile memory, file history management is possible even when a plurality of people individually own programs and share data.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a diagram showing the contents of file management information 3 in the embodiment shown in FIG. 1;

FIG. 3 is a flowchart showing the operation of the embodiment shown in FIG. 1;

4 is a diagram showing the relationship between file access and file management information 3 in the embodiment shown in FIG. 1. FIG.

[Explanation of symbols]

1 Data processing device 2. Non-volatile memory 3 File management information 4 External storage medium

Claims (1)

[Claims] 1. An external storage medium that records a program and a data file, and a non-volatile memory that stores a program name, a file name read or written while the program is being executed, and a pointer indicating an address where the file is stored. When a program is started, the information processing device searches the non-volatile memory for the started program, and if it does not exist, adds the program name to the non-volatile memory, and saves the file while the program is running. When a file is read or written, it is searched to see if there is a file in the non-volatile memory, and if it is not, the file name is written in the non-volatile memory, and the address where the file name is stored is identified as read/write of the file. 1. A file access history management method, comprising: writing a pointer to the nonvolatile memory.