用c语言做一个串口通信读写数据库,解析串口二进制指令的程序具体代码
时间: 2024-03-22 14:40:06 浏览: 62
好的,下面是一个基于C语言的串口通信读写数据库,解析串口二进制指令的程序的示例代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <windows.h>
#include <mysql.h>
#define BUFFER_SIZE 1024
// 定义解析后的指令结构体
typedef struct {
int id;
char name[32];
int age;
} Instruction;
// 串口通信读取数据的回调函数
void readSerialPortCallback(char *buffer, int length) {
// 解析二进制指令
Instruction instr;
memcpy(&instr, buffer, sizeof(Instruction));
// 连接到MySQL数据库
MYSQL *conn;
MYSQL_RES *res;
MYSQL_ROW row;
char *server = "localhost";
char *user = "root";
char *password = "123456";
char *database = "test";
conn = mysql_init(NULL);
if (!mysql_real_connect(conn, server, user, password, database, 0, NULL, 0)) {
fprintf(stderr, "%s\n", mysql_error(conn));
return;
}
// 查询指令对应的数据记录
char query[128];
sprintf(query, "SELECT * FROM student WHERE id = %d", instr.id);
if (mysql_query(conn, query)) {
fprintf(stderr, "%s\n", mysql_error(conn));
mysql_close(conn);
return;
}
res = mysql_store_result(conn);
row = mysql_fetch_row(res);
// 更新数据记录
if (row != NULL) {
sprintf(query, "UPDATE student SET name = '%s', age = %d WHERE id = %d", instr.name, instr.age, instr.id);
if (mysql_query(conn, query)) {
fprintf(stderr, "%s\n", mysql_error(conn));
mysql_free_result(res);
mysql_close(conn);
return;
}
}
// 插入新的数据记录
else {
sprintf(query, "INSERT INTO student (id, name, age) VALUES (%d, '%s', %d)", instr.id, instr.name, instr.age);
if (mysql_query(conn, query)) {
fprintf(stderr, "%s\n", mysql_error(conn));
mysql_free_result(res);
mysql_close(conn);
return;
}
}
mysql_free_result(res);
mysql_close(conn);
}
int main(int argc, char *argv[]) {
HANDLE hComm;
DCB dcb;
COMMTIMEOUTS timeouts;
char *portName = "COM1";
int baudRate = 9600;
int dataBits = 8;
int stopBits = ONESTOPBIT;
int parity = NOPARITY;
// 打开串口,并设置通信参数和超时时间
hComm = CreateFile(portName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, NULL);
if (hComm == INVALID_HANDLE_VALUE) {
fprintf(stderr, "Failed to open serial port %s\n", portName);
return 1;
}
if (!GetCommState(hComm, &dcb)) {
fprintf(stderr, "Failed to get serial port state\n");
CloseHandle(hComm);
return 1;
}
dcb.BaudRate = baudRate;
dcb.ByteSize = dataBits;
dcb.StopBits = stopBits;
dcb.Parity = parity;
if (!SetCommState(hComm, &dcb)) {
fprintf(stderr, "Failed to set serial port state\n");
CloseHandle(hComm);
return 1;
}
timeouts.ReadIntervalTimeout = 50;
timeouts.ReadTotalTimeoutConstant = 50;
timeouts.ReadTotalTimeoutMultiplier = 10;
timeouts.WriteTotalTimeoutConstant = 50;
timeouts.WriteTotalTimeoutMultiplier = 10;
if (!SetCommTimeouts(hComm, &timeouts)) {
fprintf(stderr, "Failed to set serial port timeouts\n");
CloseHandle(hComm);
return 1;
}
// 读取串口数据
char buffer[BUFFER_SIZE];
DWORD bytesRead;
while (1) {
if (ReadFile(hComm, buffer, BUFFER_SIZE, &bytesRead, NULL)) {
readSerialPortCallback(buffer, bytesRead);
}
}
CloseHandle(hComm);
return 0;
}
```
上述代码打开串口COM1,并设置通信参数和超时时间。然后,不断读取串口数据,并通过回调函数readSerialPortCallback进行解析和处理。在readSerialPortCallback函数中,首先解析二进制指令得到id、name和age字段的值,然后连接到MySQL数据库。接着,查询指令对应的数据记录,如果有则更新记录,否则插入新的记录。最后关闭数据库连接。
当然,实际的代码还需要进行调整和完善,如异常处理、多线程操作等。同时,需要根据实际的串口通信协议和数据库表结构进行具体的解析和操作。
阅读全文