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Ethernet Developers Guide
76
840 USE 115 00 Version 1.0
The member function rx_ms
g
calls the window socket recv function to read data.
The recv function either returns a non ne
g
ative number that is the number of b
y
tes
read or it returns an error. If the number b
y
tes read is zero, then the connection no
lon
g
er exits, and rx_ms
g
closes the socket, and sets the transmit state to IDLE. If
the recv function returns the error indicatin
g
that no receive data is available, then
rx_ms
g
j
ust returns. For an
y
other recv function error, rx_ms
g
closes the socket,
and sets the transmit state to IDLE.
B.12 Displaying on the Screen
CSample_View m_displa
y
member indicates the displa
y
t
y
pe. The different t
y
pes
of the displa
y
s and the CSample_View member functions for showin
g
the displa
y
are as follows.
1.
Displa
y
in
g
the connection state. The different connection states displa
y
ed are
IDLE, RESOLVING NAME, and CONNECTING. ConnPaint member function
displa
y
s the connection state.
2.
GetStatsPaint member function displa
y
s the results of a
g
et statistics re
q
uest.
3.
ClearStatsPaint member function displa
y
s the results of a clear statisitics
re
q
uest.
4.
ReadRe
g
Paint member function displa
y
s the results of a read re
g
ister re
q
uest.
5.
WriteRe
g
Paint member function displa
y
s the results of a write re
g
ister re
q
uest.
MFC architectual framework calls CSample_View OnDraw member function to
process the window WM_PAINT messa
g
e. OnDraw examines m_displa
y
member
variable and calls the correspondin
g
member function described in the previous
para
g
raph. Whenever CSample_View needs to displa
y
a result, it calls Cview
Invalidate function which causes a WM_PAINT messa
g
e.
CSample_View is derived from MFC CScrollView class. This class handles the
scroll lo
g
ic. To perform the scroll lo
g
ic, CScrollView re
q
uires the size of the
document. It is informed of the document size via its SetScrollSizes member
function.
CSample_View UpdateScrollSizes member function based on the displa
y
t
y
pe
calculates the document size, and then calls SetScrollSizes. CSample_View calls
UpdateScrollSizes when the displa
y
t
y
pe chan
g
es or when the user chan
g
es the
window size.
- Modicon Quantum Ethernet 1
- Web Embedded Server 1
- Module User Guide 1
- Web Embedded Server Module 3
- User Guide 3
- Document Set 4
- Contents 10
- About This Book 11
- Document Scope 11
- Related Documentation 12
- Validity Note 12
- Introduction 13
- Twisted Pair 140 NOE 211 10 14
- Fiber Optic 140 NOE 251 10 14
- 1.2 Front Panel Components 15
- 840 USE 115 00 Version 1.0 16
- NOE 251 10 16
- NOE 211 10 17
- 1.2.2 Address Labels 18
- 8 4 . 1 1 . 1 1 4 . 1 6 8 19
- 1.2.3 Twisted Pair Connector 20
- 1.2.4 Fiber Optic Connectors 20
- 1.3 Utility Diskette 21
- 1.4.2 Compatibility 23
- 2.1 Before You Begin . . 25
- 2.1.2 Verifyin 26
- 2.2 Installing the Module 27
- 2.2.3 Connecting the Cable 28
- 2.4.2 Assigning a Slot Number 31
- 2.4.5 Resetting the Module 32
- The MSTR Instruction 35
- 3.1 Introduction 35
- 3.2 MSTR Description 35
- 3.2.1 Characteristics 36
- 3.2.2 Representation 37
- data area 44
- control block 44
- information: 50
- Wide Web 51
- 4.1 Introduction 51
- Retrievin 52
- Data via the World Wide Web 52
- Premium PLCs 53
- Using the Network Options 55
- Ethernet Tester 55
- 5.1 Introduction 55
- Figure 21 Get Statistics Box 58
- Figure 22 Sample Statistics 59
- Figure 23 Read Register Box 61
- Ladder Logic Block 62
- Library User Guide 62
- Maintenance 63
- 6.1 Responding to Errors 63
- 6.1.2 Active LED 64
- 6.1.3 Ready LED 64
- Specifications 73
- Ethernet Developers Guide 75
- B.1 Introduction 75
- B.2 References 75
- B.3 Overview 76
- B.4 Development Environment 76
- B.5 Class Descriptions 77
- B.6 The CSample_doc Class 78
- B.7 The CSample_View Class 79
- B.8 Timers 81
- B.9 Transaction Processing 81
- B.10 Transmit State Machine 82
- B.11 Receive State Machine 84
- Quantum Ethernet TCP/IP 87
- Modbus Application Protocol 87
- C.1 Introduction 87
- C.3 TCP/IP Specific Issues 92
- C.4 Reference Documents 93
- Suppliers 95
- Glossary 100
- 840 USE 115 00 Version 1.0 103
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