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156
9.2 Event Polling
[ 1 ] Programming sample
The program below shows the event polling example which monitors the bar code reader and
the keyboard for occurrence of events.
This example uses the
EOF and INKEY$ functions to check the data input for the bar code
reader and the keyboard, respectively.
OPEN "BAR:" AS #1 CODE "A"
loop
WAIT 0,3
IF NOT EOF(1) THEN
GOSUB barcod
ENDIF
k$=INKEY$
IF k$<>"" THEN
GOSUB keyin
ENDIF
GOTO loop
barcod
BEEP
LINE INPUT #1,dat$
PRINT dat$
RETURN
keyin
.
.
.
RETURN
- How this book is organized 4
- Icons Used in This Book 7
- Compiler and Interpreter 8
- Easy Pack 8
- BHT and CU 8
- Abbreviations 9
- Related Publications 9
- Screen Indication 9
- Chapter 1 10
- 1.1 Software Overview 11
- ■ BHT-5000/BHT-6000/BHT-6500 13
- 1.1.2 Overview of BHT-BASIC 16
- 1.2 BHT-BASIC 17
- BHT-BASIC 3.0? 18
- Defining constants 19
- 1.3.1 Compiler 20
- 1.3.2 Interpreter 20
- Chapter 2 21
- 2.1.1 Required Hardware 23
- 2.1.2 Required Software 24
- 2.2.1 Developing Procedures 25
- 2.3 Writing a Source Program 27
- 2.4 Producing a User Program 29
- Procedure 30
- [ 1 ] Select a source file 31
- [ 1 ] Create a new project 32
- 2.4.4 Compiling and Building 37
- [ 2 ] Compiling 38
- [ 3 ] Building 38
- Main Window 40
- 2.4.7 Options 42
- [ 2 ] Linking options 43
- • Label–address file (.LBL) 43
- [ 4 ] Outputting list files 44
- Address-source list 44
- Symbol table 45
- • Symbol table for labels 46
- Cross reference 47
- [ 5 ] Outputting a mapfile 48
- • Details of object codes 49
- Command Line 50
- [ 2 ] Options 51
- 2.5 Downloading 57
- 2.5.2 Setting up the BHT 58
- BHT-5000/BHT-6000/BHT-6500 59
- BHT-7000/BHT-7500 59
- 2.6 Executing a User Program 60
- Chapter 3 61
- 3.1 Program Overview 62
- [ 3 ] User-defined Functions 63
- 3.2 Handling User Programs 65
- 3.2.3 Included Files 66
- Chapter 4 67
- [ 1 ] Labels 68
- [ 2 ] Statements 69
- [ 3 ] Comments 69
- 4.1.2 Program Line Length 70
- 4.2 Usable Characters 71
- PRINT USING statement 72
- DATE$ function 72
- 4.3 Labels 74
- 4.4 Identifiers 75
- 4.5 Reserved Words 76
- Chapter 5 77
- 5.1 Constants 78
- Real Constants 79
- [ 1 ] String Variables 80
- [ 2 ] Numeric Variables 81
- Work Variables 82
- Common Variables 82
- Register Variables 82
- 5.3 User-defined Functions 83
- 5.4 Type Conversion 84
- AND, OR, NOT, and XOR 85
- Chapter 6 86
- 6.1 Overview 87
- 6.2 Operator Precedence 88
- 5.0/20 (=0.25) 89
- 0.25*2 (=0.5) 89
- 4+0.5 (=4.5) 89
- 4.5-1 (=3.5) 89
- 6.3 Operators 90
- 6.3.2 Relational Operators 91
- NOT operator 92
- AND operator 93
- OR operator 93
- XOR operator 93
- 6.3.4 Function Operators 94
- 6.3.5 String Operators 94
- PRINT a1$<b1$ 95
- Chapter 7 96
- 7.1 Output to the LCD Screen 97
- [ 2 ] Switching the fonts 98
- [ 1 ] BHT-3000 98
- LOCATE 1,1 100
- LOCATE 26,1 100
- LOCATE 26,10 100
- LOCATE 1,9 101
- LOCATE 20,9 101
- LOCATE 1,2 101
- LOCATE 20,2 101
- LOCATE 26,2 102
- LOCATE 26,9 102
- LOCATE 21,1 103
- LOCATE 21,8 103
- LOCATE 1,7 104
- LOCATE 16,7 104
- LOCATE 1,2 LOCATE 16,2 104
- LOCATE 21,7 105
- LOCATE 21,2 105
- LOCATE 16,1 106
- LOCATE 16,6 106
- [ 5 ] BHT-7000 109
- [ 6 ] BHT-7500 113
- 7.1.3 Dot Patterns of Fonts 117
- Cursor shape 119
- Different-size Fonts 121
- Same Screen 122
- 7.1.6 VRAM 123
- 5000/BHT-6000/BHT-6500) 125
- Setting national characters 128
- Highlighting characters 128
- Specifying the cursor shape 128
- 7.2 Input from the Keyboard 129
- 7.2.2 Keystroke Trapping 130
- 7.2.3 Alphabet Entry Function 131
- Center Center 132
- Alphabet Entry Example 133
- BHT-5000 135
- BHT-7000/7500 135
- Entry System 136
- Alphabet Entry Procedure 137
- [ 1 ] Auto-repeat 139
- [ 2 ] Shift key 139
- 7.3 Timer and Beeper 140
- OUT Statement 141
- INP Function 141
- WAIT Statement 142
- Chapter 8 143
- 8.1 File Overview 144
- 8.2 Data Files 145
- 8.2.3 Structure of Data Files 146
- Input/Output for Numeric Data 148
- Data Retrieval 148
- Deletion of Data Files 148
- 8.2.6 About Drives 150
- 8.3 Bar Code Device 151
- Bar Code Buffer 152
- Code Mark 152
- Multiple Code Reading 152
- Generation of Check Digit 153
- 8.4 Communications Device 155
- For optical interface 156
- For direct-connect interface 157
- [ 1 ] BHT-protocol 158
- Protocol functions 159
- 8.4.4 File Transfer Tools 161
- XFILE statement 162
- Chapter 9 163
- 9.1 Overview 164
- 9.2 Event Polling 165
- 9.3 Error Trapping 167
- [ 1 ] Overview 169
- Chapter 10 171
- 10.1 Sleep Function 172
- Chapter 11 173
- 11.1 Resume Function 174
- Chapter 12 175
- 12.1 Low Battery Warning 176
- Backlight 177
- 12.3 Wakeup Function 178
- 12.4 Remote Wakeup Function 179
- (BHT-7000/BHT-7500) 179
- At the host computer 180
- Transmission control sequence 180
- [ 3 ] Remote wakeup program 182
- CHAIN statement, the 183
- Chapter 13 185
- 13.1 LCD Backlight Function 186
- Chapter 14 188
- Parameter: 189
- Description: 189
- Syntax errors: 192
- Run-time errors: 193
- Example: 193
- Reference: 193
- DEF FN (Single-line form) 214
- (Block form) 218
- FOR...NEXT 232
- FUNCTION…END FUNCTION 234
- IF...THEN...ELSE...END IF 246
- KEY ON and KEY OFF 258
- LINE INPUT 269
- LINE INPUT # 272
- ON ERROR GOTO 277
- ON...GOSUB and ON...GOTO 278
- ON KEY...GOSUB 280
- OPEN "BAR:" 284
- OPEN statement 293
- OPEN "COM:" 296
- PRINT USING 311
- SELECT...CASE...END SELECT 329
- SUB...END SUB 331
- WHILE...WEND 337
- $INCLUDE 344
- Fatal Error: 345
- COMMON statement) 346
- DEFREG statement) 346
- Chapter 15 347
- COUNTRY$ 358
- TIMEA/TIMEB/TIMEC 394
- Chapter 16 396
- 16.1 Overview 397
- (SYSTEM.FN3) 397
- SYSTEM.FN3 version 398
- R/W: Read and write possible 399
- RO: Read only 399
- 8 bytes 2 bytes 8 bytes 402
- Chapter 17 403
- FTP.FN3) for file transfer 406
- 17.3 Wireless Communications 407
- (SS.FN3) 408
- Chapter 18 414
- 18.1 Two Sides 415
- 18.2.1 General Procedure 416
- [ 2 ] Configure TCP/IP System 417
- 18.3 Socket API 426
- 18.4 FTP Client 428
- [ 3 ] Data Files 431
- 18.4.3 Using FTP Client 434
- User Programs (*.PD3) 435
- [ 5 ] FTP Transfers 436
- 18.5.1 Overview 437
- Function Number List 438
- Function #3: Connect socket 441
- Function #9: 443
- * To be set in units of 100 454
- Function #26: Create socket 456
- Function #28: Close socket 457
- Function #41: 458
- Function #42: 458
- 18.6 FTP Library (FTP.FN3) 461
- Reply Codes 462
- VERSION$ 463
- Appendices 473
- Appendix A 474
- A2. Compilation Errors 477
- Syntax Errors 479
- Error code & Message 481
- Linking Errors 483
- Error Message 484
- Library Errors 485
- Appendix B 486
- Reserved Words 486
- Appendix C 487
- Character Sets 487
- C2. National Character Sets 488
- KPLOAD statement. If the 489
- KPLOAD statement, the Inter 490
- Appendix D 492
- I/O Ports 492
- D2. BHT-4000 494
- D3. BHT-5000 497
- D4. BHT-6000/BHT-6500 501
- Output Ports 504
- OUT statement 504
- XFILE state 506
- D5. BHT-7000/BHT-7500 507
- RS/CS control 508
- state 508
- END, POWER 510
- Appendix E 514
- Non-shift mode Shift mode 514
- Non-shift mode 519
- Shift mode 519
- Memory Map 524
- Memory Management 526
- Battery Backup of Memory 526
- Host computer 528
- Appendix H 532
- Programming Notes 532
- Appendix I 535
- Program Samples 535
- Appendix J 538
- Quick Reference 538
- Handling errors 539
- Controlling the LCD screen 540
- Communicating with I/Os 542
- Commenting a program 544
- Manipulating numeric data 544
- Manipulating string data 545
- Specifying included files 545
- Appendix K 546
- - For others 547
- BHT-BASIC 560
- Programmer’s Manual 560
Prodotti e manuali riguardandi Lettori di codici a barre Denso Power Net Terminal BHT-7500
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