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通讯库推荐NModbus4

起始地址(16位) ushort startAddress 读取数量(16位) ushort numberOfPoints bool[] 02 ReadHoldingRegisters...读取AO的值从站地址(8位) byte slaveAddress 起始地址(16位) ushort startAddress 读取数量(16位) ushort numberOfPoints...ushort[] 03 ReadInputRegisters 读取AI的值从站地址(8 位) byte slaveAddress 起始地址(16位) ushort startAddress...读取数量(16位) ushort numberOfPoints ushort[] 04 WriteSingleCoil 写入值到DO 从站地址(8位) byte slaveAddress...读起始地址(16位) ushort startReadAddress 读取数量(16位) ushort numberOfPointsToRead, 写入起始地址(16位) ushort

5.9K2 0

BypassUAC

const *,ushort const *,ushort const *,int) 05 SetRasEntryProperties(ushort const *,ushort const *,ushort...* *,ulong) 06 DeleteRasEntry(ushort const *,ushort const *) 07 LaunchInfSection(ushort const *,ushort...(int,ushort const *,ushort const *,ushort const *) 12 DeleteRegistryStringValue(int,ushort const *,ushort...const *,ushort const *,ushort const *,ushort const *,ulong *) 20 RunCustomActionExe(ushort const *,ushort...const *,ushort * *) 21 SetRasSubEntryProperties(ushort const *,ushort const *,ulong,ushort * *,ulong

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C#实现Modbus RTU主站通信（一）

)modbusMaster.DataLength); UpdateDataShowushort>(registers?....)modbusMaster.DataLength); UpdateDataShowushort>(registers?....StartAddress { get; set; } = 0; public ushort DataLength { get; set; } = 1; public ushort WriteStartAddress...[]> ReadHoldingRegistersAsync(byte slaveId, ushort startAddress, ushort numberOfPoints) { try...[]> ReadInputRegistersAsync(byte slaveId, ushort startAddress, ushort numberOfPoints) { try

1.8K2 2

CC++ 原生套接字抓取FTP数据包

ipLength; // 封包总长度，即整个IP报的长度 USHORT ipID; // 封包标识，惟一标识发送的每一个数据报 USHORT...下面是TCP头的结构： typedef struct _TCPHeader { USHORT sourcePort; // 16位源端口号 USHORT destinationPort...windows; // 16位窗口大小 USHORT checksum; // 16位校验和 USHORT urgentPointer;...windows; // 16位窗口大小 USHORT checksum; // 16位校验和 USHORT urgentPointer; // 16位紧急数据偏移量...destinationPort;// 目的端口号 USHORT len; // 封包长度 USHORT checksum; // 校验和 }

7101 0

C++ 实现的Ping类的封装

m_usTotalLen; // 总长度 USHORT m_usID; // 标识 USHORT m_usFlagFragOffset; // 3位标志...+13位片偏移 BYTE m_byTTL; // TTL BYTE m_byProtocol; // 协议 USHORT m_usHChecksum...m_usChecksum; // 检验和 USHORT m_usID; // 标识符 USHORT m_usSeq; // 序号 ULONG...m_ulTimeStamp; // 时间戳（非标准ICMP头部） }; struct PingReply { USHORT m_usSeq; // 来源IP...CalCheckSum 函数 USHORT CPing::CalCheckSum(USHORT *pBuffer, int nSize) { unsigned long ulCheckSum = 0

8441 0

网络嗅探器

ipLength; // 封包总长度，即整个IP报的长度 USHORT ipID; // 封包标识，惟一标识发送的每一个数据报 USHORT...windows; // 16位窗口大小 USHORT checksum; // 16位校验和 USHORT urgentPointer...; // 16位紧急数据偏移量 } TCPHeader, *PTCPHeader; typedef struct _UDPHeader { USHORT...sourcePort; // 源端口号 USHORT destinationPort;// 目的端口号 USHORT...len; // 封包长度 USHORT checksum; // 校验和 } UDPHeader, *PUDPHeader; #endif

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C# 同步工作站与SQL服务器的时间,设置本机时间

sysTime); [StructLayout(LayoutKind.Sequential)] public struct SystemTime { public ushort... wYear; public ushort wMonth; public ushort wDayOfWeek; public ushort wDay; public... ushort wHour; public ushort wMinute; public ushort wSecond; public ushort wMiliseconds

1.4K2 0

读 WPF 源代码了解获取 GlyphTypeface 的 CharacterToGlyphMap 的数量耗时原因

GlyphTypeface 表示字体的字形信息，通过 GlyphTypeface.CharacterToGlyphMap 属性可以将给定的字符映射到字形索引，这个属性是一个 IDictionaryushort...public IDictionaryushort> CharacterToGlyphMap { get {...类型的 _cmap 字段，看到这里，似乎非常清真继续看看 IntMap 类型的实现 internal sealed class IntMap : IDictionaryushort...== null) { _cmap = new Dictionaryushort...>(); ushort glyphIndex; for (int codePoint

1261 0

一、保护模式

//0x4a USHORT Cs; //0x4c USHORT...//0x50 USHORT Reserved4; //0x52 USHORT...//0x56 USHORT Fs; //0x58 USHORT...//0x5c USHORT Reserved7; //0x5e USHORT...//0x62 USHORT Flags; //0x64 USHORT

1.6K2 0

C# 实现 Modbus 通信Demo

读取从站设备的寄存器 ushort startAddress = 0; // 寄存器起始地址 ushort numRegisters = 10; // 读取 10 个寄存器...try { // 读取保持寄存器 ushort[] registers = modbusTcpMaster.ReadHoldingRegisters...读取从站设备的寄存器 ushort startAddress = 0; // 寄存器起始地址 ushort numRegisters = 10; // 读取 10 个寄存器...try { // 读取保持寄存器（从站地址为 1） ushort[] registers = modbusRtuMaster.ReadHoldingRegisters

1.1K1 0

ping 实现设计---ICMP

下面是checksum的计算校验和的代码： USHORT checksum(USHORT* buff, int size) { unsigned long cksum = 0; while...(size>1) { cksum += *buff++; size -= sizeof(USHORT); } // 是奇数 if(size...然后取反 cksum = (cksum >> 16) + (cksum & 0xffff); cksum += (cksum >> 16); return (USHORT..., BOOL bRecv = TRUE); USHORT checksum(USHORT* buff, int size) { unsigned long cksum = 0; while...(size>1) { cksum += *buff++; size -= sizeof(USHORT); } // 是奇数 if(size

1.6K7 0

三菱FX5U PLC与C#通信开发指南

startAddress, ushort pointCount) { byte[] command = new byte[21]; // 副标题...pointCount = (ushort)(data.Length / 2); byte[] pointBytes = BitConverter.GetBytes(pointCount...startAddress, ushort pointCount) { if (!...startAddr = sortedAddresses[rangeStart].Value; ushort count = (ushort)(rangeEnd - rangeStart...startAddress, ushort pointCount) { while (!

1151 0

Modbus RTU 、Modbus ASCII及Modbus TCP驱动代码，支持主机和从机两种模式

USHORT * pusDataBuffer, LONG lTimeOut )...usReadRegAddr, USHORT usNReadRegs,...USHORT usWriteRegAddr, USHORT usNWriteRegs...eMBMasterReqReadInputRegister( UCHAR ucSndAddr, USHORT...eMBMasterReqWriteMultipleCoils( UCHAR ucSndAddr, USHORT

1.5K2 0

DeviceIOControl实战「建议收藏」

wGenConfig; // WORD 0: 基本信息字 USHORT wNumCyls; // WORD 1: 柱面数 USHORT wReserved2; // WORD 2: 保留 USHORT...USHORT DMA:1; // 1=支持DMA USHORT LBA:1; // 1=支持LBA USHORT DisIORDY:1; // 1=可不使用IORDY USHORT IORDY:1;...USHORT wPIOTiming; // WORD 51: PIO时序 USHORT wDMATiming; // WORD 52: DMA时序 struct { USHORT CHSNumber:1...; // 1=WORD 54-58有效 USHORT CycleNumber:1; // 1=WORD 64-70有效 USHORT UnltraDMA:1; // 1=WORD 88有效 USHORT...USHORT Mode0Sel:1; // 1=已选择模式0 USHORT Mode1Sel:1; // 1=已选择模式1 USHORT Mode2Sel:1; // 1=已选择模式2 USHORT Mode3Sel

2.6K4 1

WPF 修改屏幕亮度

value = (double) brightness / 100; RAMP ramp = default(RAMP); ramp.Red = new ushort...[256]; ramp.Green = new ushort[256]; ramp.Blue = new ushort[256];...ramp.Red[i] = ramp.Green[i] = ramp.Blue[i] = Math.Max(ushort.MinValue, Math.Min(ushort.MaxValue, tmp)...[256]; ramp.Green = new ushort[256]; ramp.Blue = new ushort[256];...ramp.Red[i] = ramp.Green[i] = ramp.Blue[i] = Math.Max(ushort.MinValue, Math.Min(ushort.MaxValue, tmp)

1.3K1 0

实现MyXLS设置行高的功能

12345678910 private ushort _rowHeight; /// /// Gets the row index of this Row object./// public ushort RowHeight{get { return _rowHeight; }set { _rowHeight = value; }} 2、RowBlocks.cs 在生成字节时... _rowHeight;private ushort _rowIdxStart = 0;private ushort _rowIdxEnd = 0; /// /// Gets or sets...height of the rows./// public ushort RowHeight{get { return _rowHeight; }set { _rowHeight...= value; }} /// /// Gets or sets index to first row in the range./// public ushort

100 0

原始UDP封包发送

->len); chksumlen += sizeof(pUdphdr->len); // 16位的UDP校验和，置为0 memcpy(ptr, &zero, sizeof(USHORT...)); ptr += sizeof(USHORT); chksumlen += sizeof(USHORT); // 净荷 memcpy(ptr, payload, payloadlen...ptr++; chksumlen++; } // 计算这个校验和，将结果填充到UDP头 pUdphdr->checksum = checksum((USHORT...nDestPort = 4567; USHORT nSourcePort = 8888; char szMsg[] = "This is a test \r\n"; int nMsgLen...(szSourceIp); pIphdr->ipDestination = ::inet_addr(szDestIp); pIphdr->ipChecksum = checksum((USHORT

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原始套接字和流量嗅探

), #ip数据包总长度 ("id", c_ushort), #标识符 ("offset", c_ushort...), ("id", c_ushort), ("offset", c_ushort), ("ttl", c_ubyte), ("protocol_num...), #ip数据包总长度 ("id", c_ushort), #标识符 ("offset", c_ushort...), ("id", c_ushort), ("offset", c_ushort), ("ttl", c_ubyte), ("protocol_num...), #ip数据包总长度 ("id", c_ushort), #标识符 ("offset", c_ushort

2.3K2 0

Python 抓取并解码原始数据包

), ("id", c_ushort), ("offset", c_ushort), ("ttl",...c_ubyte), ("protocol_num", c_ubyte), ("sum", c_ushort), ("src",...), ("id", c_ushort), ("offset", c_ushort), ("ttl",...c_ubyte), ("protocol_num", c_ubyte), ("sum", c_ushort), ("src",...), ("unused", c_ushort), ("next_hop_mtu", c_ushort) ] def __new_

1.1K4 0

dotnet 解析 TTF 字体文件格式

NumTables, ushort SearchRange, ushort EntrySelector, ushort RangeShift) { } 按照顺序读取各个属性，其中将会用到的属性是...Format, ushort Count, ushort StringOffset, NameRecord[] NameRecords) { } public readonly record struct...NameRecord(PlatformIdentifier PlatformId, ushort PlatformSpecificId, ushort LanguageId, NameIdentifier...NameId, ushort Length, ushort Offset, string Value) { } 这里有一个坑在于，在 NameRecord 的 Value 属性上，定义的是一个字符串...PlatformSpecificId, ushort LanguageId, NameIdentifier NameId, ushort Length, ushort Offset, string

2.2K4 0

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