C++基于开源Modbus Tcp 通讯应用客户端（稳定高效，多线程后台状态读取，不卡顿）_modbus tcp c++

---

前言

使用多线程后台批量刷寄存器的状态，在某种程度上保证了上层接口读取的时候，不会卡顿，
整体应用效果比较友好。程序应用简单稳定高效，是一个比较不错的尝试。

---

一、演示效果

二、关键程序

1.头文件

代码如下：

#pragma once
#include "modbustcpclient_global.h"
#include <QObject>
#include <QThread>
#include <QHash>
#include <QMutexLocker>
#include <QMutex>

namespace YModbus {
	class Master;
};

class MODBUSTCPCLIENT_EXPORT cModbusItem : public QThread
{
	Q_OBJECT

public:
	cModbusItem(QObject *parent = 0);
	~cModbusItem();
public:
	bool connect(QString strIp, int nPort);
	bool isConnected();
	void setServerId(int nId);
	int getServerId();

	void release();

	bool getBit(uint16_t uAddr, uint16_t uBit);
	bool readRegister16(uint16_t uAddr, uint16_t &uValue);
	bool readRegister32(uint16_t uAddr, uint32_t &uValue);
	bool readCoil(uint16_t uAddr);

	bool setBit(uint16_t uAddr, uint16_t uBit, bool bState);
	bool writeRegister16(uint16_t uAddr, uint16_t uValue);
	bool writeRegister32(uint16_t uAddr, uint32_t uValue);
	bool writeCoil(uint16_t uAddr, bool bState);

private:
	void addValueCoilsHash(uint16_t uAddr);
	void addValueHoldingRegistersHash(uint16_t uAddr);

private:
	bool ctxReadRegister(uint16_t nStartAddress, int nNum);
	bool ctxReadCoil(uint16_t nStartAddress, int nNum);

	bool ctxWriteRegister(uint16_t nStartAddress, uint16_t uValue);
	bool ctxWriteCoil(uint16_t nStartAddress, bool bState);

protected:
	void run() override;

private:

	bool m_bConnected;
	bool m_bAppClose;
	bool m_bWriteRequestState;
	bool m_bReadRequestState;
	bool m_bReadNext;
	int m_nServerID;

	QString m_strIp;
	int m_nPort;
	QMutex m_mutex;
	YModbus::Master *m_pMaster;

private:
	QHash<uint16_t, uint16_t> m_readValueHoldingRegistersHash;
	QHash<uint16_t, uint16_> m_readAddrHoldingRegistersHash;

	QHash<uint16_t, uint16_t> m_readValueCoilsHash;
	QHash<uint16_t, uint16_t> m_readAddrCoilsHash;
};

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73

2.源文件

代码如下：

#include "ModbusItem.h"
#include "ymblog.h"
#include "Ymod/ymbutils.h"
#include "Ymod/ymbtask.h"
#include "Ymod/ymbdefs.h"
#include "Ymod/Master/ymbmaster.h"
#include "Ymod/Master/ymaster.h"

#include <QVariant>
#include <QDebug>
#include <QTime>
#include <QVector>
#include <QTimer>
#define  COILS_READ_COUNT			       100
#define  HOLDING_REGISTERS_READ_COUNT	   100

struct sModbusTimer
{
	QTime time;
	uint32_t interval;

	void start(uint32_t t)
	{
		interval = t;
		time.restart();
	};

	bool isTimeOut()
	{
		return time.elapsed() > interval;
	};
};

cModbusItem::cModbusItem(QObject *parent)
	: QThread(parent)
	, m_bConnected(false)
	, m_bAppClose(false)
	, m_bWriteRequestState(false)
	, m_bReadRequestState(false)
	, m_bReadNext(true)
	, m_nServerID(1)
	, m_strIp("")
	, m_nPort(-1)
	, m_pMaster(nullptr)
{
	this->start();
}

cModbusItem::~cModbusItem()
{
	m_bAppClose = true;

	QThread::msleep(100);
}

void cModbusItem::run()
{
	static sModbusTimer timeout;
	static int nMainStep = 0;
	while (true)
	{
		if (m_bAppClose)
			return;

		switch (nMainStep)
		{
		case 0:
		{
			if (m_bConnected)
				nMainStep = 1;
			else
				QThread::msleep(500);

		}break;

		case 1:
		{
			if (true)
			{
				static int nIndex = 0;
				QHash<uint16_t, uint16_t> readAddrHoldingRegistersHashTemp;
				readAddrHoldingRegistersHashTemp = m_readAddrHoldingRegistersHash;
				auto keys = readAddrHoldingRegistersHashTemp.keys();

				if (keys.size() > 0)
				{
					nIndex = nIndex < keys.size() ? nIndex : 0;
					uint16_t uAddr = keys[nIndex];
					int nRead = uAddr - (HOLDING_REGISTERS_READ_COUNT / 2);

					// 从中间覆盖读取
					ctxReadRegister(nRead < 0 ? 0 : nRead, readAddrHoldingRegistersHashTemp[uAddr]);
					nIndex++;
				}

			}

			if (true)
			{
				static int nIndex = 0;
				QHash<uint16_t, uint16_t> readAddrCoilsHashTemp;
				readAddrCoilsHashTemp = m_readAddrCoilsHash;
				auto keys = readAddrCoilsHashTemp.keys();

				if (keys.size() > 0)
				{
					nIndex = nIndex < keys.size() ? nIndex : 0;
					uint16_t uAddr = keys[nIndex];

					// 从中间覆盖读取
					int nRead = uAddr - COILS_READ_COUNT / 2;
					ctxReadCoil(nRead < 0 ? 0 : nRead, readAddrCoilsHashTemp[uAddr]);
					nIndex++;
				}

			}

		}break;

		default:
			break;
		}
	}
}

// 连接
bool cModbusItem::connect(QString strIp, int nPort)
{
	if (m_bConnected)
		return true;

	char *chIp;
	QByteArray ba = strIp.toLatin1();
	chIp = ba.data();

	m_pMaster = new YModbus::Master(chIp, nPort, YModbus::TCP, YModbus::POLL);

	if (!m_pMaster->CheckConnect())
	{
		m_bConnected = false;
		delete m_pMaster;
		m_pMaster = nullptr;
	}
	else
	{
		m_bConnected = true;
	}

	m_strIp = strIp;
	m_nPort = nPort;

	return m_bConnected;
}

// 是否连接
bool cModbusItem::isConnected()
{
	return m_bConnected;
}

void cModbusItem::setServerId(int nId)
{
	m_nServerID = nId;
}

int cModbusItem::getServerId()
{ 
	return m_nServerID; 
}

void cModbusItem::release()
{
	m_bAppClose = true;

	QThread::msleep(30);

}

// 读取16位值
bool cModbusItem::readRegister16(uint16_t uAddr, uint16_t &uValue)
{
	if (!m_bConnected)
		return false;
	
	// 如果值读取哈希链表没有找到，需要插入到地址哈希链表，让它在后台读取
	auto itFind = m_readValueHoldingRegistersHash.find(uAddr);
	if (itFind == m_readValueHoldingRegistersHash.end())
	{
		m_readAddrHoldingRegistersHash[uAddr] = HOLDING_REGISTERS_READ_COUNT;

		if (true)
		{
			// 如果没有就先读取一次
			QHash<uint16_t, uint16_t> readAddrHoldingRegistersHashTemp;
			readAddrHoldingRegistersHashTemp = m_readAddrHoldingRegistersHash;
			int nRead = uAddr - (HOLDING_REGISTERS_READ_COUNT / 2);
			ctxReadRegister(nRead < 0 ? 0 : nRead, readAddrHoldingRegistersHashTemp[uAddr]);

			auto itFindItem = m_readValueHoldingRegistersHash.find(uAddr);
			if (itFindItem == m_readValueHoldingRegistersHash.end())
				return false;
			else
				uValue = m_readValueHoldingRegistersHash[uAddr];
		}
	}
	else
	{
		// 找到值，直接返回
		uValue = m_readValueHoldingRegistersHash[uAddr];
	}

	return true;
}

// 读取32位值
bool cModbusItem::readRegister32(uint16_t uAddr, uint32_t &uValue)
{
	if (!m_bConnected)
		return false;

	bool bRet = false;
	uint16_t uData16[2] = { 0 };
	bRet = readRegister16(uAddr, uData16[0]);
	bRet = readRegister16(uAddr + 1, uData16[1]);

	uValue = uData16[0]  | (uData16[1] << 16);

	return bRet;
}

// 获取位值
bool cModbusItem::getBit(uint16_t uAddr, uint16_t uBit)
{
	if (!m_bConnected)
		return false;

	uint16_t uValue = 0;
	readRegister16(uAddr, uValue);

	return uValue & (1 << (uBit % 16));
}

// 读取线圈值
bool cModbusItem::readCoil(uint16_t uAddr)
{
	bool bResult = false;
	uint16_t uValue = 0;

	auto itFind = m_readValueCoilsHash.find(uAddr);
	if (itFind == m_readValueCoilsHash.end())
	{
		m_readAddrCoilsHash[uAddr] = COILS_READ_COUNT;

		if (true)
		{
			QHash<uint16_t, uint16_t> readAddrCoilsHashTemp;
			readAddrCoilsHashTemp = m_readAddrCoilsHash;

			// 从中间覆盖读取
			int nRead = uAddr - COILS_READ_COUNT / 2;
			ctxReadCoil(nRead < 0 ? 0 : nRead, readAddrCoilsHashTemp[uAddr]);

			auto itFindItem = m_readValueCoilsHash.find(uAddr);
			if (itFindItem == m_readValueCoilsHash.end())
				bResult = false;
			else
				uValue = m_readValueCoilsHash[uAddr];

		}

		bResult = false;
	}
	else
		uValue = m_readValueCoilsHash[uAddr];

	if (true)
	{
		int nAddrSize = m_readAddrCoilsHash.size();
		int nValueSize = m_readValueCoilsHash.size();
	}

	uValue == 1 ? bResult = true : bResult = false;
	
	return bResult;
}

// 设置位值
bool cModbusItem::setBit(uint16_t uAddr, uint16_t uBit, bool bState)
{
	bool bRet = false;

	uint16_t uValue = 0;
	bRet = readRegister16(uAddr, uValue);

	if (bRet)
	{
		if (bState)
			uValue |= (1 << (uBit % 16));	 // 把某位置1
		else
			uValue &= ~(1 << (uBit % 16));	 // 把某位置0

		writeRegister16(uAddr, uValue);
	}

	return bRet;
}

// 写入16位值
bool cModbusItem::writeRegister16(uint16_t uAddr, uint16_t uValue)
{
	bool bRet = true;
	ctxWriteRegister(uAddr, uValue);
	return bRet;
}

// 写入32位值
bool cModbusItem::writeRegister32(uint16_t uAddr, uint32_t uValue)
{
	bool bRet = false;

	uint16_t uData16[2] = {0};
	uData16[0] = uValue & 0Xffff;
	uData16[1] = (uValue >> 16) & 0Xffff;

	bRet = writeRegister16(uAddr, uData16[0]);
	bRet = writeRegister16(uAddr+1, uData16[1]);

	return bRet;
}

// 写入线圈值
bool cModbusItem::writeCoil(uint16_t uAddr, bool bState)
{
	ctxWriteCoil(uAddr, bState);
	
	return true;
}

// 添加线圈数据列表
void cModbusItem::addValueCoilsHash(uint16_t uAddr)
{
	int nAddrStart = uAddr - (COILS_READ_COUNT / 2);
	if (nAddrStart < 0)
		nAddrStart = 0;

	//	提前添加数据列表，避免重复查询
	for (size_t i = 0; i < COILS_READ_COUNT; i++)
	{
		m_readValueCoilsHash[nAddrStart + i] = 0;
	}
}

// 添加保持寄存器数据列表
void cModbusItem::addValueHoldingRegistersHash(uint16_t uAddr)
{
	int nAddrStart = uAddr - (HOLDING_REGISTERS_READ_COUNT / 2);
	if (nAddrStart < 0)
		nAddrStart = 0;

	//	提前添加数据列表，避免重复查询
	for (size_t i = 0; i < HOLDING_REGISTERS_READ_COUNT; i++)
	{
		m_readValueHoldingRegistersHash[nAddrStart + i] = 0;
	}
}

//	读取寄存器
bool cModbusItem::ctxReadRegister(uint16_t nStartAddress, int nNum)
{
	if (!m_bConnected || m_pMaster == nullptr)
		return false;

	m_mutex.lock();
	static uint8_t buf[BUFSIZ] = { 0 };
	memset(buf, 0, sizeof(buf));
	int nLen;

	nLen = m_pMaster->ReadHoldingRegisters(m_nServerID, nStartAddress, nNum, buf, sizeof(buf));
	if (nLen == (nNum*2) && nLen != 0)
	{
		QList<uint16_t> uReadDataList;
		for (int i = 0; i < nLen; i++)
		{
			if ((i %2) ==0 )
			{
				uint16_t uValue = (buf[i] << 8) | buf[i+1];
				uReadDataList << uValue;
			}

		}
		//	写入数据哈希表
		for (size_t i = 0; i < uReadDataList.size(); i++)
		{

			m_readValueHoldingRegistersHash[nStartAddress + i] = uReadDataList[i];
		}
	}
	
	m_mutex.unlock();
	return true;
}

//	读取线圈
bool cModbusItem::ctxReadCoil(uint16_t nStartAddress, int nNum)
{
	if (!m_bConnected || m_pMaster == nullptr)
		return false;

	m_mutex.lock();
	static uint8_t buf[BUFSIZ] = { 0 };
	memset(buf, 0, sizeof(buf));
	int nLen;

	nLen = m_pMaster->ReadCoils(m_nServerID, nStartAddress, nNum, buf, sizeof(buf));
	if (nLen > 0)
	{
		QList<uint16_t> uReadDataList;
		for (int i = 0; i < nLen; i++)
		{
			uint16_t uValue = buf[i];
			uReadDataList << uValue;
		}
		//	写入数据哈希表
		for (size_t i = 0; i < nNum; i++)
		{
			int nIndex = i / 8;
			if (nIndex >= 0 && nIndex < uReadDataList.size())
			{
				int nBit = i - (8)*nIndex;
				if (nBit >= 0 && nBit < 8)
				{
					uint16_t uValue = (uReadDataList[nIndex] & (1 << nBit)) > 0 ? 1 : 0;
					m_readValueCoilsHash[nStartAddress + i] = uValue;
				}
			}
		}
	}

	m_mutex.unlock();
	return true;
}

bool cModbusItem::ctxWriteRegister(uint16_t nStartAddress, uint16_t uValue)
{
	m_mutex.lock();
	int nLen = m_pMaster->WriteSingleRegister(m_nServerID, nStartAddress, uValue);
	m_mutex.unlock();
	return true;
}

bool cModbusItem::ctxWriteCoil(uint16_t nStartAddress, bool bState)
{
	m_mutex.lock();
	int nLen = m_pMaster->WriteSingleCoil(m_nServerID, nStartAddress, bState);
	m_mutex.unlock();
	return true;
}


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459

---

三、下载链接

https://download.csdn.net/download/u013083044/87062401