JPH04335455A - Communication system between computers of different code systems - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to network communication between computers of different coding systems.

0002

2. Description of the Related Art FIG. 3 is a diagram showing code conversion processing of a conventional file transfer application program, for example, code conversion processing of a file transfer utility FTP. In the figure, 1 is a file transfer utility F that performs data transmission between networks.
TP, 2 is an OS (operating system) function, 3 is a TCP/IP network function, and 4 is a network mechanism.

Next, the operation will be explained. A network transmission request from the FTP 1 is code-converted as necessary and then notified to the OS functions 2. Next, OS functions 2 determine the I/O destination and TCP/IP network function 3
give it to Next, the network function 3 performs data flow control processing, and then passes the data via the OS functions 2 to the network mechanism 4 and transmits it to the other party's computer. At the time of data reception, reverse control is performed and after the user data is passed to FTP1, code conversion is performed in FTP1 as necessary.

0004

[Problem to be Solved by the Invention] In the conventional system, communication between application programs (hereinafter referred to as APP) between computers with different code systems is
It was necessary to perform code conversion using an APP that works with either one.

[0005] The present invention was made to solve the above-mentioned problems, and it is an object of the present invention to enable an APP to operate without code conversion.

[0006]

[Means for Solving the Problems] The present invention adds a code conversion function between a network function and an APP operating above the network function, and has the following elements. (a) Network means for controlling communication with other computers; (b) Application program for communicating with other computers using the network means and outputting code conversion instructions; (c) The above network means and application program. and code converting means for converting at least the code of the communication data from the code of another computer to the code of the own computer according to a code conversion instruction of the application program.

[0007]

[Operation] The code conversion means of the present invention enables AP
P simply specifies the code conversion specifications, and there is no need to perform conversion processing.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, 1 is an APP (application program) that performs data transmission between networks, 2 is an OS (operating system), 3 is a network function that performs network access processing, which is an example of a network means, and 5 is a network function that performs network access processing. Code conversion function, 6 is code conversion table, 7 is code conversion function 5
1 is a specification storage unit that stores conversion specifications, and 10 is code conversion means.

Next, the data transmission operation will be explained based on FIG. 2. Before network I/O, the APP 1 issues a system call to the code conversion function 5 in S1 in advance to specify code conversion specifications (selection of a code conversion table, etc.). Next, in S2, the code conversion function 5 decodes the code conversion specification specified by the system call. Furthermore, in S3, the code conversion function 5 stores the specification in the specification storage unit 7 in correlation with the corresponding process ID of the APP. Next, a case where network I/O occurs will be explained. The transmission request from APP1 is sent to OS functions 2.
passed to network function 3 through network I/
If it is determined that the transmission request is O, the code conversion function 5 is notified in S10. Next, the code conversion function 5 is S11,
It is determined whether the network I/O involves data transfer, and if it involves data transfer, in S12, the specification storage unit 7
, converts the transmission data using the conversion table 6 corresponding to the process ID, and then passes it to the network function 3. Next, after data flow control processing is performed in the network function 3, the data is passed to the network mechanism 4 via the OS functions 2.

FIG. 3 is a diagram showing an example of the specification storage section 7 in which the code conversion function stores conversion specifications. for example,
If the process ID is APP It is shown. Similarly, in the case of APP Y, using code conversion table 2, it is shown that all data is converted from code 2 of another computer to the self direction, and the case of reception only is converted. ing.

[0011] When data is received, control is performed in the opposite direction to that at the time of transmission, and in the network function 3, after storing the data in the reception buffer received from the APP, the code conversion function 5 is called and control is performed in the opposite direction to that at the time of transmission. After performing code conversion, the received data is passed to APP1.

As described above, in this embodiment, network I/O is used for network communication between computers with different code systems.
A communication method has been described in which a code conversion protocol is added between an F program and an APP that operates on a higher level, so that the APP operates without code conversion.

Example 2. Note that although the above embodiment shows a case in which there is one network protocol, a single network function can also process a plurality of protocols.

Example 3. Note that in the above embodiment, the conversion table is specified to correspond to a process, but it can also be specified to correspond to a logical session provided by a network function.

[0015]

According to the present invention, since code conversion is made independent from the APP, the APP only needs to specify the code conversion specifications and does not need to perform conversion processing.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing code conversion processing in network communication between computers using different code systems according to an embodiment of the present invention.

FIG. 2 is a diagram showing a flowchart of the present invention.

FIG. 3 is a diagram showing an example of a specification storage unit of the present invention.

FIG. 4 is a diagram showing conventional code conversion processing in network communication between computers using different code systems.

[Explanation of symbols]

1 APP for network access 2 Network function 3 OS functions 4 Network mechanism 5 Code conversion function 6 Code conversion table 7 Specification storage unit 10 Code conversion means

Claims (1)

[Claims] Claim 1: An inter-computer communication system with different code systems having the following elements: (a) network means for controlling communication with other computers; (b) communication with other computers using the network means; (c) an application program that outputs code conversion instructions; (c) located between the network means and the application program; converts at least the code of communication data into code of another computer or code of its own computer according to the code conversion instruction of the application program; Code conversion means.