JP2005216251A - Variable length multi-format converting apparatus and method and file transfer system using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable length multi-format converting apparatus and method and file transfer system using the same in which a format can be converted even if record length of each of records is a variable length in the case of converting formats of records in electronic data comprised of a plurality of records in different formats. <P>SOLUTION: The variable length multi-format converting apparatus includes: a format conversion definition file storage section 2 for storing a format conversion definition file indicating rules of format conversion; a file read section 11 for reading data of a conversion target file for the unit of a record; a format specification section 12 for specifying a format of each of the read records based on the format conversion definition file; an item extraction section 13 for extracting contents of items included in the records of which the formats are specified, based on the format conversion definition file; and a format conversion processing section 14 for converting the format of the conversion target file for each item based on the format conversion definition file. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for converting the format of each record of electronic data composed of a plurality of records having different format formats, and a file transfer system using the method, and formats even if the record length of each record is variable The present invention relates to a variable length multi-format conversion method capable of converting a format and a file transfer system using the same.

  Conventionally, electronic data composed of a plurality of records, if the record size of each record is a fixed length, even if the format format of each record is different (that is, even if it is multi-format), the format format of each record We were able to transfer after converting.

  However, when the record size of each record is variable, it is impossible to transfer after converting the format of each record.

Conventional techniques for converting the format format of electronic data composed of a plurality of records include a “format conversion apparatus and method” disclosed in Patent Document 1 and a “data conversion apparatus” disclosed in Patent Document 2.
JP 2001-184190 A Japanese Patent Laid-Open No. 11-296510

In the invention disclosed in Patent Document 1, the format is converted by specifying each record by specifying the number of digits of each item of the conversion source data. However, when the record size is variable length, the number of digits of each item also varies, so it is not easy to specify this as the number of digits.
The invention disclosed in Patent Document 1 cannot convert the format format of electronic data (that is, multi-format data) in which records having different format formats are mixed.

The invention disclosed in Patent Document 2 reads a conversion source file composed of fixed-length data, converts the file into a file composed of variable-length data based on a layout parameter, and outputs the file. However, the invention described in Patent Document 2 cannot specify an arbitrary item delimiter for each item when extracting variable length items. In addition, the records in the file must be in a single format, and a multi-format file in which records of different format formats are mixed cannot be converted.
In other words, the invention described in Patent Document 2 cannot perform format conversion unless the conversion source file is composed of a single format record. That is, when the conversion source file is a multi-format file, the format cannot be converted.

  In these fixed length multi-format conversion only file transfer systems, if the transfer target file has a different format configuration and record length for each record, a separate program for analyzing the file contents is required. Depending on the number of files and the amount of information, an analysis program is required for each individual file, and the program becomes complicated and large-scale. This places a heavy burden on the administrator in terms of system operation and maintenance.

  Thus, conventionally, when the format of each record of electronic data composed of a plurality of records having different format formats is converted, the format format cannot be converted if the record length of each record is variable. could not.

  The present invention has been made in view of such problems. When converting the format of each record of electronic data composed of a plurality of records having different format formats, the record length of each record is variable. It is an object of the present invention to provide a variable length multi-format conversion apparatus and method capable of converting a format format and a file transfer system using the same.

  In order to achieve the above object, the present invention provides, as a first aspect, means for storing format conversion definition information indicating a format conversion rule, means for reading data of a file to be converted in record units, and each record read For identifying the format format based on the format conversion definition information, means for extracting the contents of each item included in each record identifying the format format based on the format conversion definition information, and format conversion definition information Based on this, a variable-length multi-format conversion device having means for converting the format of the conversion target file for each item is provided.

  In the first aspect of the present invention, it is more preferable to further include means for transmitting the conversion target file whose format has been converted to an external device. Alternatively, the conversion target file is preferably data received from an external device.

  In any of the configurations of the first aspect of the present invention, the format conversion definition information includes a code indicating the delimiter of the item, information indicating the data type of each item, and the size of each item. It is preferable that the information is a set.

  In order to achieve the above object, the present invention provides, as a second aspect, a step of registering format conversion definition information indicating a law of format conversion in a storage device, and a step of reading data of a file to be converted in record units. A step of specifying the format format of each read record based on the format conversion definition information; a step of extracting the contents of each item included in each record specifying the format format based on the format conversion definition information; The present invention provides a variable length multi-format conversion method including a step of converting a format format of a file to be converted for each item based on format conversion definition information.

  In the second aspect of the present invention, it is more preferable that the last stage further includes a step of transmitting the conversion target file whose format has been converted to the external device. Alternatively, it is more preferable that the step of receiving the conversion target file from the external device is provided before the step of reading the data of the conversion target file in record units.

  In any configuration of the second aspect of the present invention, the format conversion definition information includes a code indicating an item delimiter, information indicating the data type of each item, and information indicating the size of each item. It is preferable that the information is a set.

  In order to achieve the above object, according to a third aspect of the present invention, there is provided a file transfer system in which a transfer source information processing apparatus and a transfer destination information processing apparatus are connected via a network. The information processing apparatus includes: means for storing format conversion definition information indicating a format conversion rule; means for reading data of a transfer target file in units of records; and specifying the format of each read record based on the format conversion definition information Means for extracting the contents of each item included in each record specifying the format format based on the format conversion definition information, and the format format of the transfer target file for each item based on the format conversion definition information. The file to be transferred and the transfer target file with the format format of each record converted It is intended to provide a file transfer system, characterized in that it comprises a means for transmitting to the destination of the information processing apparatus.

  In order to achieve the above object, according to a fourth aspect of the present invention, there is provided a file transfer system in which a transfer source information processing apparatus and a transfer destination information processing apparatus are connected via a network. The information processing apparatus includes: means for storing format conversion definition information indicating a format conversion law; means for reading data of a transfer target file received from a transfer source information processing apparatus in units of records; and format of each read record Means based on the format conversion definition information, means for extracting the contents of each item included in each record specifying the format format based on the format conversion definition information, and each item based on the format conversion definition information Each of which has a means for converting the format of the transfer target file. There is provided a yl transfer system.

  In the third aspect or the fourth aspect of the present invention, the format conversion definition information includes a code indicating the item delimiter, information indicating the data type of each item, and the size of each item. It is preferable that the information is a group.

  According to the present invention, when converting the format of each record of electronic data composed of a plurality of records having different format formats, the variable format can be converted even if the record length of each record is variable. A multi-format conversion apparatus and method and a file transfer system using the same can be provided.

[Principle of the Invention]
In the multi-format file conversion method according to the present invention, when a format format of conversion source data is defined, a delimiter code is defined for each element (also referred to as an item in the present specification) constituting the format.

  As a result, even if the conversion source data includes variable-length items, the part between the delimiter codes (however, the beginning is the part up to the first delimiter code. The end is the part after the last delimiter code. ) Can be handled as one item, the format can be converted even if the conversion source data includes a variable-length record. That is, the format format can be converted even if a variable-length record is included, by dynamically determining using a delimiter code without fixing the delimiter position of each item.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments in which the invention is suitably implemented will be described below with reference to the drawings.

[First Embodiment]
A first embodiment in which the present invention is suitably implemented will be described. FIG. 1 shows a configuration of a file transfer system according to the present embodiment. This file transfer system is a file transfer system having a variable length multi-format conversion function, and a local host 6 that is a file transmission source and a remote host 8 that is a file receiving side establish a network (communication line) 7. It is the structure connected via.

  The local host 6 includes a format conversion unit 1, a format conversion definition file storage unit 2, a transmission file storage unit 3, and a transfer control unit 5. The format conversion unit 1 converts the format of the file by a variable length multi-format conversion method described in detail later. The format conversion definition file storage unit 2 stores information (format conversion definition file) indicating a rule when the format conversion unit 1 converts a file format. The transmission file storage unit 3 stores a file to be transferred to the remote host 8. The transfer control unit 5 controls the operation of transmitting a file to the remote host 8 via the network 7.

  The format conversion unit 1 includes a file reading unit 11, a format identification unit 12, an item extraction unit 13, a format conversion processing unit 14, and a transfer request unit 15, and executes variable length multi-format conversion using these.

  The file reading unit 11 reads the record stored in the transmission file storage unit 3 and reads it into the format conversion unit 1. The format specifying unit 12 specifies the format format of the record read by the file reading unit 11 from the transmission file storage unit 3 according to the format extraction definition 21 read from the format conversion definition file storage unit 2. The item extraction unit 13 extracts items of records read in the format conversion unit 1 based on the format format specified by the format specification unit 12. The format conversion processing unit 14 reads the input format definition 22 corresponding to the format format specified by the format specifying unit 12 and the output format definition 23 corresponding to the format format after conversion from the format conversion definition file storage unit 2, and Convert the record format accordingly. The transfer request unit 15 requests the transfer control unit 5 to transfer the record whose format has been converted by the format conversion processing unit 14 (in other words, transmission to the remote host 8).

Next, a format conversion definition file used when performing the variable length multi-format conversion method will be described.
As shown in FIG. 2, the format conversion definition file includes a format extraction definition 21, an input format definition 22, an output format definition 23, an input item definition 24, and an output item definition 25. The format extraction definition 21 is information that defines extraction conditions and conversion rules for specifying a format. The input format definition 22 is information that defines a format before conversion. The output format definition 23 is information that defines the format format after conversion. The input item definition 24 is information that defines each item that is an element of the input record. The output item definition 25 is information that defines each item that is an element of the output record.

  The format extraction definition 21 includes an identification code offset 211, an identification code size 212, an extraction condition 213, an input format identification name 214, and an output format identification name 215, and a plurality of formats are defined for each type of record in the input file.

  The identification code offset 211 is an offset value from the beginning of the record in which a code (identification code) for specifying the format format of the record is stored. The identification code size 212 indicates the size (data amount) of the identification code. The extraction condition 213 is a record extraction condition for the identification code. The input format identification name 214 indicates the format definition of the record when the extraction condition 213 is satisfied. The output format identification name 215 indicates the format definition of the record after format conversion.

  The input format definition 22 includes a format identification name 221, a character code identification name 222, and an item identification name 223. The format identification name 221 is information indicating the format type of the input record. The character code identification name 222 is information indicating the character code of the character string item in the format of the input record. The item identification name 223 is information indicating the name of an item that is an element of the input record. The item identification names 223 are defined in the order of appearance in the input record.

  The output format definition 23 has the same configuration as the input format definition 22, and defines the same information as the input format definition 22 regarding the format of the output record.

  The input item definition 24 and the output item definition 25 define information about items that are format elements.

  The input item definition 24 includes an item identification name 241, an item data type 242, an item size 243, and an item delimiter code 244. The item identification name 241 defines information about an item that is an element of the format. The item identification name 242 defines a name indicating the type of item. The item size 243 indicates the size of an item in the case of a fixed length item. The item delimiter code 244 indicates an item delimiter code.

  The output item definition 25 has the same configuration as the input item definition 24 and defines the same information as the input item definition 24 regarding the output record.

The operation of the file transfer system according to this embodiment will be described.
The local host 6 on the file transmission side reads the transmission source file from the transmission file storage unit 3 to the format conversion unit 1 and performs variable length multi-format conversion to generate an output record. This operation will be described in detail.

  The file reading unit 11 reads the data of the transfer target file stored in the transmission file storage unit 3 into the format conversion unit 1 in record units or block units. Hereinafter, data read into the format conversion unit 1 by the file reading unit 11 is referred to as a read record.

  Next, the format specifying unit 12 specifies the format of the read record. FIG. 3 shows a flow of processing in which the format specifying unit 12 specifies the format of the read record. First, the variable i is reset to 0 (step S101), and this value is incremented by 1 (step S102). Then, the format specifying unit 12 reads and acquires the format extraction definition 21 stored in the i-th (here, the first) from the format conversion definition file storage unit 2 (step S103).

  If the format extraction definition 21 cannot be obtained from the format conversion definition file storage unit 2 (No at Step S104), the format specifying unit 12 determines that the format cannot be specified (Step S108), and performs processing. finish.

  When the format extraction definition 21 can be acquired from the format conversion definition file storage unit 2 (Yes in step S104), the format specifying unit 12 determines the identification code offset 211 and the identification code size 212 included in the acquired format extraction definition 21. Then, an identification code is extracted from the read record (step S105).

  In the example shown in FIG. 6, since the identification code offset of the format extraction definition in the format conversion definition file is “1” and the identification code size is “3”, the data of 3 bytes from the beginning of the input record becomes the identification code. The identification code extracted by the format conversion unit 12 is “001”.

  The format conversion unit 12 refers to the extraction condition 213 included in the format extraction definition 21 and determines whether or not the identification code extracted from the read record satisfies the extraction condition 213 (step S106). If the identification code extracted from the read record satisfies the extraction condition (step S106 / Yes), the format specifying unit 12 determines that the format of the read record is the input indicated by the input format identification name 214 included in the format extraction definition 21. The format definition 22 is determined.

  In the example of FIG. 6, since the extraction condition 213 of the format extraction definition 21 is “001” and the identification code acquired from the read record is “001”, the format specifying unit 12 determines that the identification code is the extraction condition 213. The input format identification name “INFO01” of the format extraction definition 21 is determined to be the format format of the input record.

On the other hand, when the identification code extracted from the read record does not satisfy the extraction condition 213 included in the format extraction definition 21 (No in step S106), the format specifying unit 12 increments the variable i by 1 and starts from step S103. Repeat the process.
Since a plurality of format extraction definitions 21 exist in the format conversion definition file, the format specifying unit 12 executes the above processing while sequentially changing the variable 1 until the extraction condition is satisfied.

  Even when all the extraction conditions 213 of the format extraction definition 21 are referred to, if none of the conditions is satisfied (in other words, the format extraction definition corresponding to the variable i does not exist in the format conversion definition file storage unit 2). (Steps S104 / No, S108), it is determined that the format format cannot be specified, and the process ends.

Next, the item extraction unit 13 extracts items from the read record. FIG. 4 shows an operation flow of the item extraction unit 13.
First, the item extraction unit 13 resets the variable j to 0 (step S201) and increments the value by 1 (step S202). Then, the item extraction unit 13 acquires the input item definition 24 corresponding to the j-th (here, the first) item identification name 223 defined in the input format definition 22 determined by the format specifying unit 12. (Step S203).

  In the example of FIG. 6, “ITEM01”, which is the first item identification name of the format identification name “INFO01”, is acquired.

  When the item extraction unit 13 acquires the input item definition 24 from the input format definition 22 (step S204 / Yes), the item extraction unit 13 checks whether or not the item size 243 is set in the acquired input item definition 24 (step S205).

If the item size 243 is not set in the acquired input item definition 24 (No in step S205), the item extraction unit 13 reads the code defined by the item delimiter code 244 in the input item definition 24 from the read record. .
When this search is successful (step S207 / Yes), the item extraction unit 13 extracts up to just before the item delimiter code 244 as one item (step S208).
On the other hand, if the search has failed (No at Step S207), the item extraction unit 13 determines that an item cannot be extracted from the read record (Step S209), and ends the process.

  In the example of FIG. 6, since the item delimiter code of the input item definition “ITEM02” is defined as 0xFF, data up to 0xFF is extracted as an item, and “AAAAA (variable length data)” is an item. Extracted.

  If the item size 243 is set in the acquired input item definition 24 (step S205 / Yes), the first item of the read record is set as a fixed-length item up to the size specified by the item size 243. (Step S206).

  In the example of FIG. 6, since the item size of the input item definition “ITEM01” is defined as “3”, “001” is extracted as a fixed-length item.

  Thereafter, extraction of items is repeatedly performed for all item identification names 223 defined in the input format 22 in the same manner as described above. When the processing is completed for all the item identification names 223 (in other words, when the j-th input item definition 24 cannot be acquired) (step S204 / No), the processing ends.

  When the item extraction unit 13 performs the above processing, all items can be extracted from the read record according to the format.

  Next, the format conversion processing unit 14 performs format conversion of the read record. FIG. 5 shows an operation flow of the format conversion processing unit 14.

  First, the format conversion processing unit 14 resets the variable k to 0 (step S301) and increments the value by 1 (step S302). Then, the format conversion processing unit 14 identifies the kth item (here, the first) defined in the output format definition 23 indicated by the output format identification name 215 included in the format extraction definition 21 specified by the format specifying unit 12. The output item definition 25 corresponding to the name 234 is acquired (step S303).

  If the acquisition of the output item definition 25 is successful (step S304 / Yes), the format conversion processing unit 14 searches for the item identification name in the input format definition 21 with the item identification name of the acquired output item definition 25 (step S305). ).

When the search is successful (step S306 / Yes), the format conversion processing unit 14 uses the input item definition indicated by the item identification name obtained by the search as the input item definition of the input record, and extracts the input item from the input record (step) S307).
On the other hand, if the search has failed (No in step S306), the format conversion processing unit 14 determines that the conversion definition is invalid (the conversion definition has an error) (step S309).

  The format conversion processing unit 14 converts the extracted input item into the item data type defined in the output item definition acquired in step S303, and generates an output item (step S308).

In the example of FIG. 6, since the first item of the output format definition “OUTFORM01” is “ITEM01”, the item data of the corresponding input record is “001”. Since the item data type of the input item definition “ITEM01” is “CHAR type” and the item data type “INT type” of the output item definition “ITEM01”, the input data “001” is converted from the CHAR type to the INT type. The output item is 0x00000001.
Also, since the second item identification name of the output format definition “OUTFORM01” is “ITEM03”, the item data of the corresponding input record is “BBBB... (Variable length data)”.
Furthermore, both the input format definition and output format definition items “ITEM03” have the item data type CHAR, the input format definition “INFOROM01” has the character code type “SJIS”, and the output format definition “OUTFORM01” has the character code type. Is “JIPSE”, so the item “ITEM03” is converted from SJIS to JIPSE as an output item.

  Thereafter, as described above, output item generation is repeatedly executed for all item identification names defined in the output format definition 23. As a result, the output record can be generated by converting the format of the data of one record of the input data.

  When the output record is generated by the format conversion processing unit 14, the transfer request unit 15 requests the transfer control unit 5 to transfer the generated output record in record units.

  Upon receiving the request from the transfer request unit 15, the transfer control unit 5 transmits an output record to the remote host 8 via the communication line 7. The transfer control unit 9 of the remote host 8 writes and saves the output record received via the communication line 7 in the received file storage unit 4.

  The transfer request unit 15 sequentially requests the transfer control unit 5 to transfer the output records generated by the format conversion processing unit 14.

  The file reading unit 11, the format specifying unit 12, the item extracting unit 13, the format converting unit 14 and the transfer requesting unit 15 repeat the above operations, thereby changing the format format of the variable length multi-format file as shown in FIG. The converted file and the converted format are transferred to the remote host 8.

  As described above, the file transfer system according to the present embodiment can convert the format of the variable-length multi-format file and transfer the converted file.

[Second Embodiment]
A second embodiment in which the present invention is suitably implemented will be described. FIG. 8 shows a configuration of the file transfer system according to the present embodiment. This file transfer system has a configuration in which a local host 6 and a remote host 8 are connected via a network 7 as in the first embodiment.

In the present embodiment, the local host 6 includes a transmission file storage unit 3, a file reading unit 31, a transfer request unit 32, and a transfer control unit 5.
The transmission file storage unit 3 and the transfer control unit 5 are the same as those in the first embodiment. The file reading unit 31 reads a record stored in the transmission file storage unit 3. The transfer request unit 22 requests the transfer control unit 5 to transfer the file read from the transmission file storage unit 3 by the file reading unit 31 (in other words, transmission to the remote host 8).

  In this embodiment, the remote host 8 further includes a format conversion unit 1, a format conversion definition file storage unit 2, a received file storage unit 4, and a transfer control unit 9.

  The format conversion unit 1 includes a format specifying unit 12, an item extraction unit 13, and a format conversion processing unit 14, and executes variable length multi-format conversion using these.

  The format specifying unit 12 specifies the format format of the record input from the transfer control unit 9 according to the format extraction definition 21 read from the format conversion definition file storage unit 2. The item extraction unit 13 extracts items of records read in the format conversion unit 1 based on the format format specified by the format specification unit 12. The format conversion processing unit 14 reads the input format definition 22 corresponding to the format format specified by the format specifying unit 12 and the output format definition 23 corresponding to the format format after conversion from the format conversion definition file storage unit 2, and Convert the record format accordingly.

  The format conversion definition file storage unit 2, the received file storage unit 4, and the transfer control unit 9 are the same as those in the first embodiment. The format conversion definition file used when the variable length multi-format conversion method is performed is the same as that in the first embodiment.

The operation of the file transfer system according to this embodiment will be described.
In the local host 6 on the file transmission side, the file reading unit 31 sequentially reads out the transmission source file from the transmission file storage unit 3 in units of records and transfers it to the transfer request unit 22. The transfer control unit 5 transmits to the remote host 8 via the network 7 in response to a request from the transfer request unit 22.

  The transfer control unit 9 of the remote host 8 passes the record transmitted from the local host 6 to the format conversion unit 1.

  Next, the format specifying unit 12 specifies the format of the read record. Since this operation is the same as the processing performed on the local host side by the file transfer system according to the first embodiment, description thereof is omitted.

  Next, the item extraction unit 13 extracts items from the read record. This operation is also the same as the processing performed on the local host side by the file transfer system according to the first embodiment, and a description thereof will be omitted.

Next, the format conversion processing unit 14 performs format conversion of the read record. This operation is also the same as the processing performed on the local host side by the file transfer system according to the first embodiment, and a description thereof will be omitted.
The format conversion processing unit 14 sequentially stores the records whose format has been changed in the received file storage unit 4.
In this way, it is possible to convert the format of the variable-length multi-format file and transfer the converted file to the remote host 8.

Each of the above embodiments is an example of a preferred embodiment of the present invention, and the present invention is not limited to these.
For example, the format conversion definition file shown is merely an example, and the present invention is not limited to this.
As described above, the present invention can be variously modified.

It is a figure which shows the structure of the file transfer system concerning 1st Embodiment which implemented this invention suitably. It is a figure which shows the structure of a format conversion definition file. It is a figure which shows the flow of the process which specifies the format of the file of conversion object. It is a figure which shows the flow of the process which extracts the item of a conversion object file. It is a figure which shows the flow of the process which converts the format of the conversion object file. It is a figure which shows the structural example of a format conversion definition file. It is a figure which shows an example of format conversion. It is a figure which shows the structure of the file transfer system concerning 2nd Embodiment which implemented this invention suitably.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Format conversion part 2 Format conversion definition file storage part 3 Transmission file storage part 4 Reception file storage part 5, 9 Transfer control part 6 Local host 7 Network 8 Remote host 11 File reading part 12 Format specification part 13 Item extraction part 14 Format conversion Processing unit 15, 32 Transfer request unit 31 File reading unit 21 Format extraction definition 22 Input format definition 23 Output format definition 24 Input item definition 25 Output item definition 211 Identification code offset 212 Identification code size 213 Extraction condition 214 Input format identification name 215 Output Format identification name 221 231 Format identification name 222 232 Character code type 223 233 241 251 Item identification name 242 252 Item data Type 243, 253 Item size 244, 254 Item separator code

Claims (11)

Means for storing format conversion definition information indicating a law of format conversion;
Means for reading the data of the file to be converted in record units,
Means for specifying the format format of each read record based on the format conversion definition information;
Means for extracting the contents of each item included in each record specifying a format based on the format conversion definition information;
A variable-length multi-format conversion device comprising means for converting the format format of the conversion target file for each item based on the format conversion definition information.   2. The variable length multi-format conversion device according to claim 1, further comprising means for transmitting the file to be converted whose format has been converted to an external device.   2. The variable length multi-format conversion device according to claim 1, wherein the conversion target file is data received from an external device.   The format conversion definition information is information in which a code indicating a delimiter of the item, information indicating the data type of each item, and information indicating the size of each item are grouped for the format format before and after the conversion. The variable length multi-format conversion device according to any one of claims 1 to 3. Registering format conversion definition information indicating a format conversion law in a storage device;
A step of reading the data of the file to be converted in record units,
Identifying the format format of each read record based on the format conversion definition information;
Extracting the contents of each item included in each record specifying the format format based on the format conversion definition information;
A variable length multi-format conversion method comprising: converting a format format of the conversion target file for each item based on the format conversion definition information.   6. The variable length multi-format conversion method according to claim 5, further comprising a step of transmitting the file to be converted whose format has been converted to an external device at the last stage.   6. The variable length multi-format conversion method according to claim 5, further comprising the step of receiving the conversion target file from an external device before the step of reading the data of the conversion target file in record units.   The format conversion definition information is information in which a code indicating a delimiter of the item, information indicating the data type of each item, and information indicating the size of each item are grouped for the format format before and after the conversion. The variable length multi-format conversion method according to any one of claims 5 to 7. A file transfer system in which a transfer source information processing apparatus and a transfer destination information processing apparatus are connected via a network,
The transfer source information processing apparatus includes:
Means for storing format conversion definition information indicating a law of format conversion;
Means for reading the data of the transfer target file in record units,
Means for specifying the format of each read record based on the format conversion definition information;
Means for extracting the contents of each item included in each record specifying a format based on the format conversion definition information;
Means for converting the format format of the transfer target file for each item based on the format conversion definition information;
A file transfer system comprising: means for transmitting the transfer target file in which the format format of each record is converted to the information processing apparatus of the transfer destination. A file transfer system in which a transfer source information processing apparatus and a transfer destination information processing apparatus are connected via a network,
The information processing apparatus of the transfer destination is
Means for storing format conversion definition information indicating a law of format conversion;
Means for reading data of a transfer target file received from the transfer source information processing apparatus in units of records;
Means for specifying the format of each read record based on the format conversion definition information;
Means for extracting the contents of each item included in each record specifying a format based on the format conversion definition information;
A file transfer system comprising: means for converting the format format of the transfer target file for each item based on the format conversion definition information.   The format conversion definition information is information in which a code indicating a delimiter of the item, information indicating the data type of each item, and information indicating the size of each item are grouped for the format format before and after the conversion. The file transfer system according to claim 9 or 10.

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