JPH03154934A - Method for detecting file transfer error - Google Patents

Abstract

PURPOSE:To detect a file transfer error when a file is transferred in plural times by deciding the transfer error when no coincidence is obtained between the sizes of files stored in a storage medium set at the reception side of files and the total size shown at a size file. CONSTITUTION:A computer 10 produces a size file and transfers the file together with the files A - C in the case of transferring these files. Based on this transfer, the total size of the files A - C stored in a magnetic disk 21 and the size file itself is compared with the total size shown at the size file. If no coincidence is obtained between both sizes, a transfer error is decided. Thus, it is possible to detect a transfer error generated when a file is transferred in plural times.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a file transfer error detection method for detecting transfer errors when a file is transferred multiple times.

(Prior Art) Each file stored on a storage medium, for example a magnetic disk, may be transferred to another magnetic disk. Figure 5 schematically shows a case where one product file, such as an electronic cash register, is created, and this file is transferred multiple times to send the created file to each electronic cash register installed in a supermarket, etc. There is.

In this case, the file is transferred from the magnetic disk 1 to the magnetic disk 2, and then transferred from the magnetic disk 2 to the magnetic disk n multiple times.

(Problem to be Solved by the Invention) By the way, in this type of file transfer, if there is only one transfer, it is possible to detect whether there is an error in the transferred file on the package, but as shown in FIG. When data is repeatedly transferred to different magnetic disks 1 to n a plurality of times, it is difficult to accurately detect whether an error has occurred in the contents of the file stored on magnetic disk n.

Therefore, even if data garbled occurs in the transferred file, it cannot be detected, and the reliability of transferring the file multiple times is low.

Therefore, one object of the present invention is to provide a file transfer error detection method that can detect transfer errors when a file is transferred multiple times.

(Means and effects for solving the problem) The present invention creates a size file indicating the total size of all files to be transferred, and transfers the size file together with the files to be transferred at the time of file transfer. Compare the size of the file stored on the storage medium on which the data was sent and the total size indicated in the size file,
This is a file transfer error detection method that attempts to achieve the above objective by detecting a transfer error if the sizes are not the same.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a file transfer device to which the file transfer error detection method of the present invention is applied. computer 10
Each magnetic disk 20, 21 is connected to the magnetic disk 20, and each file stored on the magnetic disk 20 is transferred to the other magnetic disk 21. Here, on the magnetic disk 20, each file A, B, etc. as shown in FIG.
C is stored, and a size file is also stored. Each file A for this size file.

The total size of B, C, and the size file itself is stored.

The computer 10 creates a size file and stores each file A to be transferred when each file A, B, and C is transferred.
, B, and C, and each file A, B stored on the magnetic disk 21 by this transfer.
, C and the size file itself and the total size indicated in the size file, and if they are not the same size, it is detected as a transfer error. Specifically, CPU (Central Processing Unit) 11
is provided, and the RA is connected to this CPU 1 via the bus 12.
M (random access or memory) 13, ROM (
read-only memory) 14 and l10 (input/output) port 15 are connected. ROM
14 stores a program according to the transfer detection flowchart shown in FIG. I10 port 15 has display device 1
6 is connected.

Next, the operation of detecting a transfer error in the transfer apparatus configured as described above will be explained with reference to the transfer detection flowchart shown in FIG.

The CPU 1 reads the magnetic disk 20 in step s1.
Load file A stored in the RAM 13 into the RAM 13. Next, the CPU 1 moves to step s2, reads out the file A stored in the RAM 13, and stores it in the magnetic disk 21. When the storage on the magnetic disk 21 is completed, the CPU 1
1 compares the file A stored in the RAM 13 with the file A stored in the magnetic disk 21 in step s3, and if these files A and A have the same content, the process moves to the next step s5. By this comparison, each file A.

If the contents of A are not the same, the CPU II will
and perform error handling. Note that this error processing is displayed on the display device 16 through the I10 port 15.

Further, as a result of the comparison in step S4, if the contents of each file are the same, the CPU 1'l moves to step s5, calculates the size of the file, and stores the size value in the RAM 1.
Store in 3.

Next, in step sll, the CPU II determines whether the transfer of all files A, B, C and the size file has been completed. Load the stored file B into the RAM 13, and step s
2, the file B stored in the RAMI 3 is read out and stored on the magnetic disk 21. Thereafter, in the same way as the above operation, the CPU 1 compares the file B stored in the RAMI 3 and the file A stored in the magnetic disk 21 in step s3.

If the contents of B are the same, the CPU II moves to the next step S5, and if the contents of each file are the same, the CPU II moves to the next step S5.
, find the size of file B, and set the size value to R.
Add to the size value of file A on AM13.

When the transfer of each file A, B, C and size file is completed in this way, the CPU 1 performs step s7.
Each file A, B, added on the RAM 13 in
The total size of C and the size file (=1) is compared with the total size stored in the transferred size file. As a result of this comparison, if the total size of each file A, B, C and the size file is the same as the total size value stored in the size file, the CPU II determines that no error has occurred in the transfer. to decide. However, as shown in Figure 4, for example, if file A becomes corrupted and its size becomes smaller, the total size of each file A, B, C and size file is stored in the size file. be smaller than the total size value. As a result, the CPU 11 determines that each of the transferred files A, B, and C has been garbled, and proceeds to step s9 to execute error processing.

In this way, in the above embodiment, a size file is created that indicates the total size of all files A, B, and C to be transferred and the size file, and is The size files are transferred, and each file A, B is stored in the storage medium 21 by this transfer.

The total size of C and the size file is compared with the total size of 1 shown in the size file, and if they are not the same size, it is detected as a transfer error. Even if this is the 8th transfer of files A, B, and C, these files A.

Transfer errors of B and C can be detected.

Note that the present invention is not limited to the above-mentioned embodiment, and may be modified without departing from the spirit thereof. For example, the storage medium is not limited to a magnetic disk, but can also be applied to a magnetic tape. Further, the size stored in the size file may be the total size of files A, B, and C.

(Effects of the Invention) As described in detail above, according to the present invention, it is possible to provide a file transfer error detection method that can detect transfer errors when a file is transferred multiple times.

[Brief explanation of the drawing]

1 to 4 are diagrams for explaining the file transfer error detection method according to the present invention, in which FIG. 1 is a configuration diagram of a file transfer device to which the method is applied, and FIG. 2 is a diagram showing files to be transferred. Figure 3 is a file transfer flowchart, Figure 4 is a diagram showing files with garbled data, and Figure 5 is a diagram showing files with garbled data.
The figure is a diagram showing file transfer. 10... Computer, 11... CPU, 12...
・Bus, 13...RAM, 14...ROM, 15.
・・I10 port, 16...Display device, 20.21・
...Magnetic disk.

Claims (1)

[Claims] In a file transfer error detection method that detects transfer errors when transferring a file from one storage medium to another at least twice, a size file is created that indicates the total size of all files to be transferred, and The size file is transferred together with the file, and the size of the file stored in the storage medium on the transferred side is compared with the total size indicated in the size file, and if they are not the same size. A file transfer error detection method characterized by detecting it as a transfer error.