JP3004963B2 - Information terminal device and screen data processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a computer which performs processing using data of a one-byte code system, and an information terminal apparatus which performs communication using a code system used by the computer and processes characters and the like using a two-byte code system. The present invention relates to suppression of a reduction in efficiency when processing is performed in a two-byte code system.

[0002]

2. Description of the Related Art When communication is performed between a host computer and an information terminal device that handles a different code system of the host computer, the information terminal device sends the information from the host computer via a communication network such as a WAN or a LAN. It is common practice to code-convert and handle such data. For example, in the network configuration shown in FIG.
Is the EBCDIC code system, and the information terminal device 2 is Shi.
Assuming that each of the ft Jis codes is used, the information terminal device 2 internally stores data of the EBCDIC code system (hereinafter, simply referred to as “EBCDIC data”) transmitted from the host computer 1 via the public network 3. The data is converted into Shift Jis code system data (hereinafter, simply referred to as “Shift Jis data”) and used. On the other hand, the internally generated Shift Jis data is converted into EBCDIC data and then transmitted to the host computer 1.

[0005] FIG. 5 is a simplified functional block diagram of the information terminal device 2. FIG. 5 shows the transmission / reception processing unit 4,
A configuration in which a screen data buffer 5, a data analysis unit 6, a display unit 7, and a keyboard input unit 8 on a memory are connected to an internal bus 9 is shown. It should be noted that functional components that are not necessary for the description of processing such as code conversion to be described later are omitted. With reference to FIG. 5, a description will be given of a process of displaying data transmitted from a host computer on a screen and a process of transmitting internal data to the host computer, which are performed on the conventional information terminal device side.

[0004] Upon receiving the EBCDIC data sent from the host computer, the transmission / reception processing unit 4 stores the data as it is in the screen data buffer 5. When the data is stored, the data analysis unit 6 analyzes the data. And the code system of the data is EBCD
If the EBCDIC data is recognized as an IC, all received EBCDIC data is converted to Shi based on the conversion table held therein.
The data is converted into ft Jis data and stored in the screen data buffer 5. The display unit 7 refers to the screen data converted into the Shift Jis code and displays the information such as the character code, the character color, the inversion, and the ruled line on a display (not shown). In addition, the code of the displayed character is Shi.
ft Jis code system. In FIG. 5, the flow of data at the time of data display is indicated by a broken arrow.

[0005] On the other hand, when there is a request to make some corrections to the displayed screen data from the keyboard and then send the corrections to the host computer, the keyboard input unit 8 sends a data request to the data analysis unit 6. I do. The input from a keyboard (not shown) received by the keyboard input unit 8 is in the Shift Jis code system, and the input characters are displayed on the display as they are. The data analysis unit 6 determines that the input Sh
Converts if Jis data to EBCDIC data. The transmission / reception processing unit 4 transmits the converted EBCDIC data to the host computer. In FIG. 5, the flow of data at the time of data transmission is indicated by an alternate long and short dash line arrow.

When characters are displayed on a display, usually, in addition to the character codes to be simply displayed, attribute information such as the display color of the characters, character decoration, and the like are also required. Generally, data necessary for displaying a character on a display (hereinafter referred to as “screen data”) has a display attribute of each character in addition to a character code. FIG. 6 is a conceptual diagram when the screen data sent from the host computer is analyzed and assembled. The screen data includes, in addition to a data group (hereinafter, referred to as a “plane”) specifying a character code, It is composed of 6 planes in combination of a character field attribute and four extended attributes. In the extended attribute plane, ruled line attributes, input attributes, display attributes, and color attributes are specified in correspondence with each character. When the size of the display screen is 24 rows × 80 columns, the screen data buffer area for holding the character code corresponding to the display character requires 1920 bytes, but each plane for the display attribute corresponds to each character code. Therefore, in order to hold the screen data for one screen, a total of 1920 bytes × 6
A plane = 11520 bytes of screen data buffer area is required.

[0007] In recent years, Java OS and the like suitable for coping with the Internet environment have become widespread. However, even an information terminal device using this Java OS or the like can display screen data transmitted from a host computer. It is, of course, desired.
JavaOS uses UNICODE as a standard code system, so Shift Jis data and UNICODE are used.
A processing function for mutually converting data of the E-code system (hereinafter, simply referred to as “UNICODE data”) is required, and this processing function is provided as a standard function. In addition,
In UNICODE, not only kanji but also half-width characters are handled in two bytes, and thus a code system expressing data in two bytes is referred to as a “two-byte code system”. On the other hand, in EBCDIC and Shift Jis,
Half-width characters use a 1-byte code system, and kanji use a 2-byte code system. Therefore, strictly speaking, it is a code system in which the 1-byte code system and the 2-byte code system are mixed. However, in order to make a difference from the above-mentioned 2 byte code system, the mixed code system of 1 byte and 2 bytes is used. Expressed as "1 byte code system".

[0008]

As described above, UNICODE handles half-width characters that can be represented by one byte in two bytes, so that all EBCDIC data is converted into UNICODE data used internally as in the prior art. If the data is held in the screen data buffer, the buffer area used when displaying the screen data on the information terminal device is simply doubled. In addition, it is not always efficient to convert all the data of the transmitted 1-byte code system to the 2-byte code system before processing the data even if it is not used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. An object of the present invention is to provide an information terminal device which processes characters and the like in a two-byte code system. It is an object of the present invention to provide an information terminal device and a screen data processing method that suppresses a decrease in efficiency when processing is performed in a 2-byte code system by effectively using data for forming a screen.

It is another object of the present invention to provide a screen data processing method for suppressing a reduction in internal processing efficiency by using data sent from a computer that performs processing in a different code system in the same code system of the computer. .

[0011]

In order to achieve the above object, an information terminal device according to the present invention transmits data from a computer that processes data in a 1-byte code system by using a code system used by the computer. A code conversion process is performed on the received data stream, which is a received data stream for forming an obtained screen and includes a character code of a character and a display attribute of each character as a set, and the display device performs 2D conversion.
In an information terminal device for displaying characters of a byte code system, a screen data buffer for storing screen data generated based on a received data stream sent from the computer, and a character of a 1-byte code system to be displayed While reading only the code portion from the screen data buffer and converting it to a 2-byte code system that can be displayed on the display device,
Display control means for displaying on the display device by referring to the unconverted display attributes stored in the screen data buffer corresponding to the character code, and screen data other than the character code to be displayed. Internally, the one-byte code system is handled as it is.

An input control means for converting an input character code of a character of a two-byte code system and a display attribute of the character into a one-byte code system and writing the converted character code into the screen data buffer; Transmission processing means for transmitting the data converted into the code system to the computer.

A screen data processing method according to the present invention is an information terminal device for displaying data transmitted from a computer which processes data having different code systems according to a code system used by the computer. The screen data buffer holds screen data generated based on the received data stream that is a received data stream for forming a transmitted screen and includes a character code of a character and a display attribute of each character in a set. And a code conversion step of converting only a character code to be displayed among the screen data held in the screen data buffer into a code system used internally, and holding the converted character code in the screen data buffer. by referring to the display attribute unconverted corresponding to the character code being It is intended to include a Shimesuru display step.

The computer performs data processing in a one-byte code system, and the information terminal device displays data in a two-byte code system.

[0015] Further, a screen data holding step of converting the corrected screen data of the displayed screen data into a one-byte code system and writing the data into the screen data buffer, and converting the screen data into a one-byte code system handled by the computer. Transmitting the screen data to the computer, and holding and transferring the screen data in a one-byte code system inside the information terminal device.

[0016]

Preferred embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information terminal device according to the present invention. The information terminal device in the present embodiment is a two-byte code system U
This is a device for displaying data on a screen by NICODE, and performs data communication with a host computer using an EBCDIC code as in the conventional example. In FIG.
1 shows a configuration in which a transmission / reception processing unit 4, a screen data buffer 5 on a memory, a data analysis unit 6, a display control unit 10, and a keyboard input control unit 11 are connected to an internal bus 9.
The transmission / reception processing unit 4 transmits / receives data of a coding system used by the host computer to / from the host computer. The screen data buffer 5 is prepared on the memory of the information terminal device, and holds the received data stream sent from the host computer and the screen data to be sent to the host computer. The data analysis unit 6 converts the received EBCDIC data into Shift Jis data by referring to a conversion table held in the screen, and converts the transmitted data into EBCDIC data. The display control unit 10 displays characters on a display based on the Shift Jis data stored in the screen data buffer 5. Keyboard input control unit 11
Converts the input UNICODE data to Shift J
After being converted into is data, it is held in the screen data buffer 5. The components with the same reference numerals as in the conventional example are as follows:
The same as the conventional example may be used.

A feature of the present embodiment is that when data is handled inside the apparatus, data is handled in a 1-byte code system as much as possible. As a result, it is possible to suppress a reduction in the efficiency of data holding and data processing in the information terminal device using the 2-byte code system. The possible range is UNI
Other than the display of a character code that cannot be processed unless it is CODE, for example, data retention, data transfer on an internal bus, display attributes to be used, and the like.

Next, display processing of screen data transmitted from the host computer and transmission processing to the host computer according to the present embodiment will be described. First,
The screen data display processing will be described with reference to the flowchart shown in FIG.

Upon receiving the EBCDIC data sent from the host computer, the transmission / reception processing unit 4 stores the data as it is in the screen data buffer 5 (step 101). When the data is stored, the data analysis unit 6 analyzes the data. And the received EBC
All of the character codes included in the DIC data are converted to Shift Ji based on the conversion table stored therein.
The data is converted into s data, and the display attributes and the like are converted into the corresponding plane information, and are stored in the screen data buffer 5 (step 102). Since the transmitted data is in a format suitable for transmission and reception and not in a format suitable for display, it is necessary to assemble it into a logical screen. For this reason,
A data analysis unit 6 is required. The processing up to this point is the same as the conventional example. The display control unit 10 displays the character code on a display (not shown) with reference to the converted Shift Jis data, and this operates as follows.

The display control unit 10 is, for example, 24 rows × 80
When displaying characters on the digit display screen, first, only one line of screen data is extracted from the screen data buffer 5, and if a character code is set, colors and character decorations are displayed according to the display attribute corresponding to the character code. The characters are displayed with the addition of the characters. That is, the processing is performed line by line, and
It will be repeated for four lines. Therefore, the display control unit 10
First retrieves the screen data of the first line from the screen data buffer 5, but in this embodiment, the
The screen data of the Shift Jis code which has not been converted to the ODE code is taken out from the screen data buffer 5 (step 103). The extracted screen data is composed of the character code and display attribute on the first line. In the present embodiment, only the character code is UN
It is converted to ICODE (step 104). That is,
The display attribute is attribute information to be used for display, and it is only necessary to grasp the setting contents of this attribute information. Therefore, it is not necessary to convert the data into UNICODE data and then grasp the setting contents. Absent. Note that the character code to be displayed cannot be displayed unless it is converted into a UNICODE code, so it is necessary to convert it. When the display control unit 10 converts the character code into the UNICODE code, the display control unit 10 converts the converted character code into Shift J code.
The display is displayed on the display with reference to the display attribute of the is code system (step 105). By repeating the above processing for 24 lines, one screen can be displayed. In FIG. 1, the flow of data at the time of data display is indicated by a dashed arrow.

According to the present embodiment, only the part which cannot be handled unless it is in the UNICODE code system, that is, only the character code to be displayed is converted into the UNICODE code, and the other data is handled in the 1-byte code system. I did it. As a result, unnecessary conversion processing is not performed even in a device that handles the 2-byte code system, and the processing efficiency is not reduced. Specifically, for the UNICODE data, it is only necessary to provide a buffer in the display control unit 10 for temporarily storing the data obtained by converting the character codes for one line.

The data transferred by the internal bus 9 also remains in the 1-byte code system. Further, in the present embodiment, the screen data buffer 5 can also display characters of the 2-byte code system with the same amount of usage as in the related art.

Next, the processing when the displayed screen data is modified and its contents are transmitted to the host computer will be described with reference to the flowchart shown in FIG.

When some modification is made to the displayed screen data from a keyboard (not shown), the keyboard input control unit 11 internally converts the input UNICODE code screen data (character code and display attribute) into a Shift Jis code. (Step 11
1) Write into the corresponding plane of the screen data buffer 5 (step 112). Since the information input from the keyboard is UNICODE, the corrected content is used for the display processing without any code conversion. Here, when a request to transmit the correction content to the host computer is made by a keyboard input or the like (step 113), the data analysis unit 6 determines that only the corrected portion of the Shift Jis data in the screen data buffer 5 is EBCDIC. It is converted into a code (step 114). Then, the transmission / reception processing unit 4 transmits the changed EB
The CDIC data is transmitted to the host computer (Step 115). In FIG. 1, the flow of data at the time of data transmission is indicated by a dashed-dotted arrow.

According to the present embodiment, the correction data generated in the UNICODE of the 2-byte code system is converted into the Shift Jis code in the keyboard input control unit 11 and then written into the screen data buffer 5, so that the screen data An increase in the usage of the buffer 5 can be suppressed. Also, the data transferred by the internal bus 9 remains the one-byte code system.

Of course, even if the EBCDIC data is uniformly converted into UNICODE data and processed in the apparatus, it is naturally possible to perform data display processing and the like. However, half-width characters are 1 byte long, and kanji characters are 2 byte length and data length mixed.
In the case where all data of the Jis code system is converted into a code having a length of 2 bytes and handled, when a half-width character is represented, a data area of 1 byte is not only wasted, but also causes a significant reduction in processing efficiency. There is a risk. That is,
When transmitting 2-byte data to the host computer, it must be converted to 1-byte code.
If the means for processing in the byte code system receives 2-byte data, it determines whether the 2-byte data is valid for both 2 bytes or whether the first 1 byte is unnecessary and only the lower 1 byte is valid. You have to do it. According to the present embodiment, the keyboard input control unit 1
1 when UNICODE data is received
Since the data is converted into tJis data and held in the screen data buffer 5, even when other means such as the data analysis unit 6 handles the screen data, the above-described extra process of determining whether the data is valid or invalid is also performed. Need not be added.

Normally, data sent from the outside is used after being converted into a code system used internally. In the present embodiment, only data requiring code conversion, that is, the screen to be displayed is displayed. The data is converted to the character code only when necessary, and then used. Therefore, unnecessary code conversion processing is not required. This has the same effect in an information processing apparatus that handles the same 1-byte code data. However, in the case where data is transmitted / received in the 1-byte code system in the information terminal device that processes in the 2-byte code system as in the present embodiment, not only the processing efficiency but also the increase in the data amount due to unnecessary code conversion is increased. Can be further suppressed.

In this embodiment, since it is assumed that the data analysis unit 6 can be realized with the same processing function as that of the conventional example, EBCDIC data from the host computer is uniformly converted to Shift Jis data. Then, the ShiftJis data is converted into UNICODE data as needed. But,
The data (received data stream) sent in the EBCDIC code system is assembled into a screen data format composed of 6 planes, and stored in a screen data buffer.
You may make it convert directly from CDIC data to UNICODE data. The same applies to data transmission as well as data reception. EBCD is used as a received data stream sent from the host computer.
Although the IC data is taken as an example, data of another 1-byte code system such as Shift Jis data may be used. Further, in the present embodiment, the data transmitted from the host computer is expressed as a received data stream, and it is assumed that the data is not transmitted and received in the format of screen data composed of six planes. You may make it. In the case of this embodiment,
The screen data referenced by the display control unit 10 may be any screen data composed of the predetermined six planes,
The format of data transmitted to and received from the host computer is a separate configuration issue.

In this embodiment, the keyboard input control unit 11 is provided as input control means because input from a keyboard is taken as an example. However, input from other input devices such as a mouse can be handled in the same manner. it can.

[0031]

According to the present invention, when data is handled inside the device, the data is handled with the 1-byte code system as much as possible. Therefore, even in an information terminal device using the 2-byte code system, the data is used. It is possible to suppress a decrease in efficiency in holding and data processing.

That is, when displaying the screen data,
Since only the character codes to be displayed are converted to the 2-byte code system, and the display attributes corresponding to the character codes to be displayed are also handled in the 1-byte code system, there is no need to perform unnecessary code conversion processing. In addition, a screen data buffer for holding screen data converted into a 2-byte code system is not required.

In the case where the displayed data is corrected, the correction data generated in the 2-byte code system is converted into 1-byte code by the input control means and then sent to the screen data buffer for holding. It is possible to suppress an increase in the buffer.

Further, since code conversion is performed at the time of displaying only the minimum screen data necessary for screen display, a reduction in processing efficiency can be suppressed.

Further, since the correction data generated in the two-byte code system is converted into a one-byte code and then sent to and held in the screen data buffer, the increase in the screen data buffer can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an information terminal device according to the present invention.

FIG. 2 is a flowchart showing a display process of screen data in the present embodiment.

FIG. 3 is a flowchart showing a process of correcting and transmitting screen data in the present embodiment.

FIG. 4 is an overall configuration diagram of a conventional system.

FIG. 5 is a simplified functional block configuration diagram of a conventional information terminal device.

FIG. 6 is a conceptual diagram when the screen data sent from the host computer is analyzed and assembled.

[Explanation of symbols]

4 transmission / reception processing unit, 5 screen data buffer, 6 data analysis unit, 9 internal bus, 10 display control unit, 11 keyboard input control unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G06F 3/02 320 G06F 3/02 390 G06F 13/00 351 G06F 17/21

Claims (5)

(57) [Claims] 1. A received data stream for forming a screen transmitted from a computer that processes data in a one-byte code system by a code system used by the computer, the character code of a character and the character code of each character An information terminal device that performs a code conversion process on a received data stream including a set of display attributes and displays characters of a 2-byte code system on a display device. The information terminal device generates a character based on the received data stream sent from the computer. A screen data buffer for storing screen data to be read, and reading only a character code portion of a 1-byte code system to be displayed from the screen data buffer and converting it into a 2-byte code system that can be displayed on the display device. The converted character code is stored in the screen data buffer corresponding to the character code. Not stored in §
Display control means for displaying on the display device by referring to the display attribute of the conversion, wherein the screen data other than the character code to be displayed is internally handled as a 1-byte code system. Terminal device. 2. An input control means for converting an input character code of a character of a two-byte code system and a display attribute of the character into a one-byte code system and writing the same in the screen data buffer, and one byte used by the computer. The information terminal device according to claim 1, further comprising: transmission processing means for transmitting data converted into a code system to the computer. 3. An information terminal device for displaying data transmitted from a computer that processes data having a different code system according to a code system used by the computer, wherein the information terminal device displays a screen transmitted from the computer. Holding in a screen data buffer screen data generated based on the received data stream, which is a received data stream and including a character code of a character and a display attribute of each character as a set; and holding the screen data in the screen data buffer. Not that the code conversion step, a character code converted, corresponding to the character code stored in the screen data buffer for converting only the character codes eligible to appear among the screen data to the encoding scheme used internally a display step of displaying by referring to the display attribute of the conversion, to include Screen data processing method according to symptoms. 4. The screen data processing method according to claim 3, wherein said computer performs data processing in a one-byte code system, and said information terminal device displays data in a two-byte code system. 5. A screen data holding step of converting the corrected screen data of the displayed screen data into a one-byte code system and then writing the data into the screen data buffer; and converting the screen data into a one-byte code system handled by the computer. 5. The screen data processing method according to claim 4, further comprising: transmitting the screen data to the computer; and holding and transferring the screen data in a one-byte code system inside the information terminal device.