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Chapter 9. Event Polling and Error/Event Trapping
147
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
- Bar Code and 2D Code 8
- Abbreviations 8
- Related Publications 8
- Screen Indication 8
- Chapter 1 9
- Software Overview for the BHT 9
- 1.1 Software Overview 10
- 1.1.2 Overview of BHT-BASIC 12
- 1.2 BHT-BASIC 13
- BHT-BASIC 3.0? 14
- PRIVATE or GLOBAL statement) 15
- 1.3.1 Compiler 16
- 1.3.2 Interpreter 16
- Chapter 2 17
- 2.1.1 Required Hardware 19
- 2.1.2 Required Software 20
- 2.2.1 Developing Procedures 21
- 2.3 Writing a Source Program 23
- 2.4 Producing a User Program 25
- Procedure 26
- [ 1 ] Select a source file 27
- [ 1 ] Create a new project 28
- 2.4.4 Compiling and Building 33
- [ 2 ] Compiling 34
- [ 3 ] Building 34
- Main Window 36
- 2.4.7 Options 38
- [ 2 ] Linking options 39
- • Label–address file (.LBL) 39
- [ 4 ] Outputting list files 40
- Address-source list 40
- Symbol table 41
- Cross reference 42
- [ 5 ] Outputting a mapfile 43
- • Details of object codes 44
- Command Line 45
- [ 2 ] Options 46
- 2.5 Downloading 52
- 2.6 Executing a User Program 53
- Chapter 3 54
- 3.1 Program Overview 55
- [ 3 ] User-defined Functions 56
- 3.2 Handling User Programs 58
- 3.2.3 Included Files 59
- Chapter 4 60
- [ 1 ] Labels 61
- [ 2 ] Statements 62
- [ 3 ] Comments 62
- 4.1.2 Program Line Length 63
- 4.2 Usable Characters 64
- PRINT USING statement 65
- DATE$ function 65
- 4.3 Labels 67
- 4.4 Identifiers 68
- 4.5 Reserved Words 69
- Chapter 5 70
- 5.1 Constants 71
- Real Constants 72
- [ 1 ] String Variables 73
- [ 2 ] Numeric Variables 74
- Work Variables 75
- Common Variables 75
- Register Variables 75
- 5.3 User-defined Functions 76
- 5.4 Type Conversion 77
- AND, OR, NOT, and XOR 78
- 5.5 Scope of Variables 79
- 5.5.2 Local Variables 81
- 5.5.4 Common Variables 83
- Chapter 6 84
- 6.1 Overview 85
- 6.2 Operator Precedence 86
- 5.0/20 (=0.25) 87
- 0.25*2 (=0.5) 87
- 4+0.5 (=4.5) 87
- 4.5-1 (=3.5) 87
- 6.3 Operators 88
- 6.3.2 Relational Operators 89
- NOT operator 90
- AND operator 91
- OR operator 91
- XOR operator 91
- 6.3.4 Function Operators 92
- 6.3.5 String Operators 92
- PRINT a1$<b1$ 93
- Chapter 7 94
- 7.1 Output to the LCD Screen 96
- Screen mode 97
- Font size 97
- Display angle 97
- Reverse font attribute 98
- Enlargement attribute 98
- Tone attribute 98
- 7.1.2 Coordinates on the LCD 99
- 12 x 12 dots (Regular) 102
- 24 x 12 dots (Double-width) 102
- 12 x 24 dots 102
- (Double-height) 102
- 24 x 24 dots (Quadruple) 102
- Chapter 7. I/O Facilities 103
- Two-byte Kanji Mode 103
- • Standard-size font 103
- • Small-size font 104
- Cursor shape 105
- In regular size 107
- In double-width 107
- In double-height 107
- In quadruple size 107
- 16 dots12 dots 110
- Moves the cursor position 110
- Small-size font coordinates 110
- Display position of the 111
- Coordinates 111
- Loading a user-defined font 112
- 7.1.6 VRAM 113
- ’Set bit 7 only to 1 114
- Setting national characters 115
- Specifying the cursor shape 115
- 7.2 Input from the Keyboard 116
- Alphabet Entry Procedure 117
- [ 1 ] Auto-repeat 118
- [ 2 ] Shift key 118
- 7.3 Timer and Beeper 119
- OUT Statement 120
- INP Function 120
- WAIT Statement 121
- 7.5.1 Outline 122
- 13 14 15 16 123
- Non-shift mode Shift mode 123
- F1 F2 F3 F4 125
- F5 F6 F7 F8 125
- F9 F10 F11 F12 125
- F13 F14 F15 F16 125
- [ 5 ] Keystroke trapping 126
- 7.5.3 User-Defined Touch Keys 127
- "CONSOLE 128
- FN3" 128
- 7.5.4 Software Keyboard 129
- OUT statement 130
- OUT 5,0) 130
- OUT 5,3) 130
- Chapter 8 133
- 8.1 File Overview 134
- 8.2 Data Files 135
- 8.2.3 Structure of Data Files 136
- • Number of Written Records 137
- Input/Output for Numeric Data 138
- Data Retrieval 138
- Deletion of Data Files 138
- Drive Defragmentation 139
- 8.2.6 About Drives 140
- 8.3 Bar Code Device 141
- BHT-100B 142
- EOF, INP 144
- Code Mark 145
- Multiple Code Reading 145
- Reading 146
- 8.4 Communications Device 149
- [ 1 ] BHT-protocol 150
- [ 2 ] BHT-Ir protocol 151
- 8.4.4 File Transfer Tools 152
- Chapter 9 153
- 9.1 Overview 154
- 9.2 Event Polling 155
- 9.3 Error Trapping 157
- [ 1 ] Overview 159
- Chapter 10 161
- 10.1 Sleep Function 162
- Chapter 11 163
- 11.1 Resume Function 164
- Chapter 12 165
- 12.1 Low Battery Warning 166
- 12.3 Wakeup Function 167
- 12.4 Remote Wakeup Function 168
- [ 3 ] Remote wakeup program 170
- CHAIN statement, the 171
- Chapter 13 173
- Chapter 14 176
- Parameter: 177
- Description: 177
- 0123 5678910114 179
- Syntax errors: 180
- Run-time errors: 180
- Example: 180
- Reference: 181
- DEF FN (Single-line form) 202
- (Block form) 206
- FOR...NEXT 220
- FUNCTION…END FUNCTION 222
- IF...THEN...ELSE...END IF 234
- KEY ON and KEY OFF 246
- LINE INPUT 256
- LINE INPUT # 259
- This cursor is invisible 262
- This cursor is visible 262
- LOCATE ,25 263
- PRINT “A”; 263
- ON ERROR GOTO 265
- ON...GOSUB and ON...GOTO 266
- ON KEY...GOSUB 268
- OPEN "BAR:" 272
- W instead of K 284
- OPEN statement 284
- "A:A12" 287
- OPEN "COM:" 294
- PRINT USING 307
- SELECT...CASE...END SELECT 327
- SUB...END SUB 329
- WHILE...WEND 335
- $INCLUDE 342
- Fatal Error: 343
- COMMON statement) 344
- DEFREG statement) 344
- Chapter 15 345
- COUNTRY$ 356
- LOC function 381
- TIMEA/TIMEB/TIMEC 393
- Chapter 16 395
- Extended Functions 395
- 16.1 Overview 396
- (SYSTEM.FN3) 397
- R/W: Read and write possible 398
- RO: Read only 398
- 8 bytes 2 bytes 8 bytes 404
- .syOkOthLk 405
- .syLkNoRes 405
- Screen (CONSOLE.FN3) 407
- .fcDot Draw a dot 408
- .fcLine Draw a full line 409
- .fcDtLine Draw a dotted line 410
- .fcRect Draw a rectangle 413
- .fcDotGet Get drawn dot state 414
- .cnW1H1 0 Regular-size 417
- .cnW2H1 1 Double-width 417
- .cnW1H2 2 Double-height 417
- .cnW2H2 3 Quadruple-size 417
- .fcLcdClr Clear the LCD 418
- (SYSMDFY.FN3) 419
- .fcCrc16 Calculate a CRC-16 424
- Chapter 17 425
- PWBS C SF 426
- FTP.FN3) for file transfer 428
- 17.4.1 Overview 430
- Chapter 18 436
- 18.1 Two Sides 438
- 18.2.1 General Procedure 439
- [ 2 ] Configure TCP/IP System 440
- Note for run-time error 105h 448
- 18.2.4 Sample Program 449
- 18.3.1 General Procedure 450
- 18.3.4 Sample Program 456
- Chapter 18. TCP/IP 457
- 18.4 Socket API 459
- According to TCP and UDP 461
- (Example) 463
- 18.5 FTP Client 467
- [ 3 ] Data Files 470
- 18.5.3 Using FTP Client 473
- User Programs (*.PD3) 474
- [ 5 ] FTP Transfers 475
- 18.6.1 Overview 476
- Function Number List 477
- .fcConnect Connect socket 480
- .fcGSckOpt Get socket option 481
- 32-bit integer 482
- • • • • • • • • 484
- .fcSSckOpt Set socket options 494
- .fcShutdwn Shut down socket 495
- .fcSocket Create socket 496
- .fcClose Close socket 497
- 18.7 FTP Library (FTP.FN3) 503
- Reply Codes 504
- PARA% Item number 516
- FTP.PARA%/FTP.PARA$) 516
- Appendices 520
- Appendix A 521
- A2. Compilation Errors 525
- Error code & Message 526
- Syntax Errors 527
- Linking Errors 531
- Error Message 532
- Library Errors 533
- Appendix B 534
- Reserved Words 534
- Appendix C 535
- Character Sets 535
- C2. National Character Sets 536
- Appendix D 537
- I/O Ports 537
- TIME$ function -0System time 538
- RS/CS control 541
- Output Ports 543
- Appendix E 548
- Appendix F 549
- Memory Area 549
- Memory Management 550
- Battery Backup of Memory 550
- Host computer 551
- SEARCH function 552
- Example 3 553
- XFILE statement 554
- Appendix H 555
- Programming Notes 555
- Appendix I 556
- Program Samples 556
- Appendix J 559
- Quick Reference 559
- Handling errors 560
- Controlling the LCD screen 561
- Communicating with I/Os 563
- Commenting a program 565
- Manipulating numeric data 565
- Manipulating string data 566
- Specifying included files 566
- Appendix K 567
- BHT-BASIC 577
- Programmer’s Manual 577
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