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Finding the Number of Records in a File
User’s Guide 147
Finding the Number of Records in a File
The easiest way to determine the number of records in a file is to use a Verify
node with
Match set to a value you know is not in the file and the Store Index
in
Register checkbox selected (with a register specified for storing the index
value). Since it won’t find a match, the program will return the file size, storing
it in the index register.
Another method copies a known value to the end of the file, uses a
Verify node
to locate it, and then subtracts 1 from the
Location Index. Tip07.scr,
illustrated in
Figure 120, demonstrates this method.
Figure 120. Tip07.scr Determines the Number of Records in a File
Display:
RECORDS
Writes
RECORDS= on the portable’s screen.
2342.book Page 147 Thursday, July 22, 2004 8:35 AM
- PT Program Generator 1
- CONTENTS 3
- iii 5
- v 7
- (PPG) Software End User 9
- License Agreement 9
- ix 11
- Chapter 1 13
- Introduction 13
- Style Conventions 14
- Mouse Actions 15
- Portable Keys 15
- Chapter 2 17
- Getting Started 17
- Before You Start 18
- PPG Installation 18
- Supported Portables 19
- Installing PPG 19
- Launching and Exiting PPG 20
- Overview of PPG 21
- Program Files 22
- User Interface 23
- Program Nodes Toolbar 24
- Navigation 25
- Generating the Program 26
- Chapter 3 27
- PPG Application Design 27
- Application Structure 28
- 17 29
- Creating Function Nodes 30
- Creating Operation Nodes 30
- Actual vs. Virtual Display 31
- Sending and Receiving Files 32
- Additional Resources 33
- Chapter 4 35
- The PPG Menubar 35
- Creating a New File (Ctrl+N) 36
- Closing a File 37
- Saving a File (Ctrl+S) 37
- Printing a File (Ctrl+P) 38
- Page Setup 39
- Download (Ctrl+D) 40
- 29 41
- Customize Display (Ctrl+Y) 43
- Node type pull 44
- Recent Files 45
- Edit Menu 46
- Moving Objects 47
- Cut (Ctrl+X) 47
- Copy (Ctrl+C) 47
- Paste (Ctrl + V) 47
- Delete (Del) 48
- Properties 48
- 37 49
- Operation Nodes 49
- View Menu 50
- 39 51
- Program Nodes 51
- Create Menu 52
- 41 53
- Function Nodes 54
- Window Menu 56
- Cascade Windows 57
- Tile Windows 57
- Filename [Frame] 58
- Help Menu 59
- Chapter 5 61
- Creating & Using Nodes 61
- Flow Chart Levels 62
- Subroutines 63
- Creating New Nodes 65
- Menu Nodes 67
- Display Nodes 68
- Input Nodes 69
- Input From Tab (Next Nodes) 70
- Track Size Tab 70
- 59 71
- Display Tab 71
- Output Nodes 72
- 61 73
- Information to Output Tab 73
- Special Commands 74
- Verify Nodes 75
- Verify Information Tab 76
- 65 77
- Verify Options Tab 77
- Copy Nodes 78
- Modify Nodes 79
- Data to Modify 80
- Modification Type 80
- Math Nodes 81
- Floating Point Math 82
- Operand 1 Tab 82
- 71 83
- Operand 2 Tab 83
- Result Tab 83
- Call Nodes 84
- 73 85
- Call Subroutine 85
- Adjusting Links 86
- Moving Links 86
- Deleting Links 86
- Automatically Generated Nodes 87
- Chapter 6 89
- Managing Data 89
- Controlling Data Flow 90
- Registers 90
- Register Fields 91
- Specifying a Register Field 92
- 81 93
- Using a File as a Source 94
- Data Location 94
- Using a File as a Destination 95
- Templates 96
- Creating a Template 97
- Figure 57 on 98
- 87 99
- Using Fields in Templates 100
- Chapter 7 101
- PT40 Communication 101
- What Happens 102
- Figure 61. PPGXFER Window 102
- 91 103
- Using XFER32 104
- General Tab 105
- 93 105
- Transfer Tab 106
- 95 107
- Sending and Receiving Data 108
- 97 109
- Transmit (Send) Files 109
- Receive Files 110
- Appendix A 111
- PPG Tutorial 111
- Studying a Sample Program 112
- 101 113
- 103 115
- Figure 75) 116
- Figure 76) 116
- 105 117
- Creating Frames and Links 118
- 107 119
- Creating Links 119
- Main Menu Access 120
- Creating the Main Menu Nodes 121
- 111 123
- Figure 83 124
- Saving Your Program 125
- 115 127
- The Display: Enter Item Node 127
- The Input: Item Node 127
- 117 129
- The Verify: Input Node 130
- 119 131
- The Output: Error Beep Node 131
- The Display: Error Text Node 131
- The Copy: To File Node 132
- 121 133
- The Menu: Confirmation Node 134
- The Output: to PC Node 134
- 123 135
- The Menu: Error Text Node 135
- The Display: Successful Node 136
- 125 137
- The Modify: Erase File Node 137
- Loading and Using the Program 138
- *123456* *987654* 139
- *192837* *223344* 139
- *918273* *90102A* 139
- Creating and Using Templates 140
- Creating the New Nodes 141
- Verify node to the Copy node 142
- Creating the Fields 143
- 133 145
- Loading the Program 146
- Appendix B 147
- Example Frames 147
- Setting the Date and Time 148
- Changing the Auto-Off Timeout 148
- 137 149
- Sample Verification Methods 150
- 139 151
- Verify Integer 152
- 141 153
- Verifying Input Size 154
- 143 155
- 145 157
- 147 159
- Searching for a Partial Match 160
- Searching for Data in a File 161
- 151 163
- Copy: 1ST FIL copies the 164
- Copy: 2ND FIL 164
- 153 165
- Input: ITEM 166
- Reviewing a File 167
- Sounding a Beep 169
- Copy node 170
- Appendix C 171
- The PPG Library 171
- Hangman is spelled out 172
- 161 173
- Appendix D 175
- PPG System Commands 175
- Using Predefined Defaults 176
- Alternate Parameters 177
- Reset Mode 178
- Appendix E: 179
- ASCII/Hex Conversion Table 180
- Appendix F 181
- Useful Bar Codes 181
- *$+S-D2C8EE* 182
- Appendix G 183
- Troubleshooting 183
- Options > Settings. Then 184
- Error Messages 185
- 175 187
- PPGComp Error Messages 187
- PPGXfer Error Messages 188
- 177 189
- Technical Support 190
- Appendix H 191
- Glossary 191
- 181 193
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