修改tcp连接的返回值，增加套接字的有效性进行判断

modbus/modbus_tools/modbusConnect.ini

@@ -1,5 +1,5 @@
 [MODBUS_SLAVE]
-SLAVE_IP_ADDR=192.168.1.7
-SLAVE_IP_PORT=503
+SLAVE_IP_ADDR=192.168.50.155
+SLAVE_IP_PORT=502
 
 

modbus/modbus_tools/modbus_lib/modbus-tcp.cpp

@@ -371,7 +371,7 @@ static int _modbus_tcp_connect(modbus_t *ctx)
         return -1;
     }
 
-    return 0;
+    return ctx->s;
 }
 
 /* Establishes a modbus TCP PI connection with a Modbus server. */

modbus/modbus_tools/ysp_modbus_master.cpp

@@ -1,6 +1,7 @@
 #include <iostream>
 #include "modbus_lib/modbus-tcp.h"
 #include "common.h"
+#include "time.h"
 
 using namespace std;
 #define REG_ADDR (header_length+1)
@@ -56,7 +57,7 @@ void xMaster_Set_slave_port(const char* tcp_port)
 DWORD WINAPI xModbus_master_Proc(LPVOID lp) {
 	char* com = (char*)lp;
 	CHAR rcv_buf[1024] = { 0 };
-	int s = -1;
+	int sockt = -1;
 	int i = 0;
 	int rc = 0;
 	modbus_t* ctx = NULL;
@@ -69,6 +70,8 @@ DWORD WINAPI xModbus_master_Proc(LPVOID lp) {
 	modbus_mapping_t* mb_mapping;
 	int nb_points;
 	uint16_t* tab_rp_registers = NULL;
+	fd_set 	fdset_ro, fdset_wr, fdset_ex;
+	struct	timeval	timeout;
 
 	//Read the starting address of the holding register
 	unsigned short start_hold_register = 0x0000;//读保持寄存器的起始地址
@@ -89,15 +92,50 @@ DWORD WINAPI xModbus_master_Proc(LPVOID lp) {
 	}
 
 	modbus_set_response_timeout(ctx, 20, 0);
-		if (modbus_connect(ctx) == -1) {
+	sockt = modbus_connect(ctx);
+	if (sockt == -1) {
 		fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno));
 		modbus_free(ctx);
 		return -1;
 	}
 
 	unsigned char* src = (unsigned char*)tab_rp_registers;
-		
+	while (1)
+	{
+#if 0
+		if (sockt < 0)
+			return -1;
+		FD_ZERO(&fdset_ro);
+		FD_ZERO(&fdset_wr);
+		FD_ZERO(&fdset_ex);
+		FD_SET(sockt, &fdset_ro);
+		FD_SET(sockt, &fdset_wr);
+		FD_SET(sockt, &fdset_ex);
+		memset((char*)&timeout, 0, sizeof(struct timeval));
+		if (select(sockt + 1, &fdset_ro, &fdset_wr, &fdset_ex, &timeout) < 1)
+		{
+			Sleep(1);
+			continue;
+		}
+		if (FD_ISSET(sockt, &fdset_ex))
+		{
+			//printf("关闭tcp端口\n");
+			closesocket(sockt);
+			sockt = -1;
+			break;
+		}
+		if (FD_ISSET(sockt, &fdset_ro))
+#endif
 		rc = modbus_read_registers(ctx, start_hold_register, number_regs, tab_rp_registers);
+#if 0
+		if (rc == -1)
+		{
+			closesocket(sockt);
+			sockt = -1;
+			printf("End Thread！\n");
+			return -1;
+		}
+#endif
 		Sleep(3 * 1000);
 		//xUnsigned_char_hex_out("recv", src, 0, number_regs*2);
 		xRead_reg_hex_out(start_hold_register, "master recv", src, 0, number_regs * 2);
@@ -134,12 +172,19 @@ DWORD WINAPI xModbus_master_Proc(LPVOID lp) {
 
 		printf("t=%ld\n", t);
 
+		time_t now = time(NULL);
+		struct tm t0;
+		localtime_s(&t0, &now);
+		printf("收到数据时间是:%d年%d月%d日 %d时%d分%d秒\n", t0.tm_year + 1900, t0.tm_mon + 1, t0.tm_mday, t0.tm_hour, t0.tm_min, t0.tm_sec);
+		//printf("t=%d\n", (int)time(NULL));
 
 		//time_t t3 = 0x64F9 << 16 | 0x4204;
 		//printf("t3=%ld\n", t3);
 		//time_t t4 = 1694056964;
 		//printf("%02x\n",t4);
-		while (1);
+		Sleep(15 * 1000);
+	}
+	//while (1);
 
 
 	return 0;