下面是我的代码。我想发送十六进制值，并在超级终端中获取十六进制的输出。我不确定如何发送。
我在超级终端输出中得到了一些垃圾值。它正在读取但未发送十六进制输出。
#include "stdafx.h"
#include <Windows.h>
#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <stdint.h>
#define BUFFERLENGTH 256
int main(void)
{
HANDLE hComm; // Handle to the Serial port
char ComPortName[] = "\\\\.\\COM6"; // Name of the Serial port(May Change) to be opened,
BOOL Status;
DWORD dwEventMask; // Event mask to trigger
unsigned char TempChar; // Temperory Character
char SerialBuffer[256]; // Buffer Containing Rxed Data
DWORD NoBytesRead; // Bytes read by ReadFile()
int i = 0;
printf("\n\n +==========================================+");
printf("\n | Serial Communication (Win32 API) |");
printf("\n +==========================================+\n");
/*----------------------------------- Opening the Serial Port --------------------------------------------*/
hComm = CreateFile(ComPortName, // Name of the Port to be Opened
GENERIC_READ | GENERIC_WRITE, // Read/Write Access
0, // No Sharing, ports cant be shared
NULL, // No Security
OPEN_EXISTING, // Open existing port only
0, // Non Overlapped I/O
NULL); // Null for Comm Devices
if (hComm == INVALID_HANDLE_VALUE)
printf("\n Error! - Port %s can't be opened", ComPortName);
else
printf("\n Port %s Opened\n ", ComPortName);
/*------------------------------- Setting the Parameters for the SerialPort ------------------------------*/
DCB dcbSerialParams = { 0 }; // Initializing DCB structure
dcbSerialParams.DCBlength = sizeof(dcbSerialParams);
Status = GetCommState(hComm, &dcbSerialParams); //retreives the current settings
if (Status == FALSE)
printf("\n Error! in GetCommState()");
dcbSerialParams.BaudRate = CBR_9600; // Setting BaudRate = 9600
dcbSerialParams.ByteSize = 8; // Setting ByteSize = 8
dcbSerialParams.StopBits = ONESTOPBIT; // Setting StopBits = 1
dcbSerialParams.Parity = EVENPARITY; // Setting Parity = None
Status = SetCommState(hComm, &dcbSerialParams); //Configuring the port according to settings in DCB
if (Status == FALSE)
{
printf("\n Error! in Setting DCB Structure");
}
else
{
printf("\n Setting DCB Structure Successfull\n");
printf("\n Baudrate = %d", dcbSerialParams.BaudRate);
printf("\n ByteSize = %d", dcbSerialParams.ByteSize);
printf("\n StopBits = %d", dcbSerialParams.StopBits);
printf("\n Parity = %d", dcbSerialParams.Parity);
}
/*------------------------------------ Setting Timeouts --------------------------------------------------*/
while (1)
{
COMMTIMEOUTS timeouts = { 0 };
timeouts.ReadIntervalTimeout = 5000;
timeouts.ReadTotalTimeoutConstant = 5000;
timeouts.ReadTotalTimeoutMultiplier = 1000;
timeouts.WriteTotalTimeoutConstant = 5000;
timeouts.WriteTotalTimeoutMultiplier = 1000;
if (SetCommTimeouts(hComm, &timeouts) == FALSE)
printf("\n Error! in Setting Time Outs");
else
printf("\n\n Setting Serial Port Timeouts Successfull");
printf("\n |--------- Serial Communication (Win32 API) --------|");
printf("Starting to write......");
//char lpBuffer[] = "ABC"; // lpBuffer should be char or byte array, otherwise write wil fail
uint8_t message[15];
message[0] = 0x16;
message[1] = 0x16;
message[2] = 0x02;
message[3] = 0x01;
message[4] = 0x07;
message[5] = 0x08;
message[6] = 0x00;
message[7] = 0xFF;
message[8] = 0xFF;
message[9] = 0x01;
message[10] = 0x00;
message[11] = 0x01;
message[12] = 0x00;
message[13] = 0xFF;
message[14] = 0xFF;
//byte(bytestosend)[15] = { message[0], message[1], message[2], message[3], message[4], message[5], message[6], message[7], message[8], message[9],message[10], message[11],message[12], message[13], message[14] };
DWORD dNoOFBytestoWrite; // No of bytes to write into the port
DWORD dNoOfBytesWritten = 0; // No of bytes written to the port
dNoOFBytestoWrite = sizeof(message); // Calculating the no of bytes to write into the port
Status = WriteFile(hComm, // Handle to the Serialport
message, // Data to be written to the port
dNoOFBytestoWrite, // No of bytes to write into the port
&dNoOfBytesWritten, // No of bytes written to the port
NULL);
if (Status == TRUE)
printf("\n\n %X %X %X %X %X %X %X %X %X %X %X %X %X %X %X- Written to %s", message[0], int(message[1]), int(message[2]), int(message[3]), int(message[4]), int(message[5]), int(message[6]), int(message[7]), int(message[8]), int(message[9]), int(message[10]), int(message[11]), int(message[12]), int(message[13]), int(message[14]), ComPortName);
else
printf("\n\n Error %d in Writing to Serial Port", GetLastError());
int k;
for (k = 0; k < 50; k++)
{
printf("");
}
/*-----------------------------------Read --------------------------------------------*/
int l;
for (l = 0; l < 50; l++)
{
printf("");
}
printf("\n\n Waiting for Data Reception");
dwEventMask = 1;
//Status = WaitCommEvent(hComm, &dwEventMask, NULL); //Wait for the character to be received
/*-------------------------- Program will Wait here till a Character is received ------------------------*/
if (Status == FALSE)
{
printf("\n Error! in Setting WaitCommEvent()");
}
else //If WaitCommEvent()==True Read the RXed data using ReadFile();
{
printf("\n\n Characters Received");
do
{
//byte(TempChar)[15] = { message[0], message[1], message[2], message[3], message[4], message[5], message[6], message[7], message[8], message[9],message[10], message[11],message[12], message[13], message[14] };
//if(! ReadFile(hComm, &TempChar, sizeof(TempChar), &NoBytesRead, NULL))
if (!ReadFile(hComm, &TempChar, sizeof(TempChar), &NoBytesRead, NULL))
///* ReadFile(
// _In_ HANDLE hFile,
// _Out_writes_bytes_to_opt_(nNumberOfBytesToRead, *lpNumberOfBytesRead) __out_data_source(FILE) LPVOID lpBuffer,
// _In_ DWORD nNumberOfBytesToRead,
// _Out_opt_ LPDWORD lpNumberOfBytesRead,
// _Inout_opt_ LPOVERLAPPED lpOverlapped
// );*/
//if (!ReadFile(hComm, SerialBuffer, BUFFERLENGTH, &NoBytesRead, NULL))
{
printf("wrong character" );
}
//printf("/n /n %X %X %X %X %X %X %X %X %X %X %X %X %X %X %X", int(TempChar[0]), int(TempChar[1]), int(TempChar[2]), int(TempChar[3]), int(TempChar[4]), int(TempChar[5]), int(TempChar[6]), int(TempChar[7]), int(TempChar[8]), int(TempChar[9]), int(TempChar[10]), int(TempChar[11]), int(TempChar[12]), int(TempChar[13]), int(TempChar[14]));
SerialBuffer[i] = TempChar;
//printf("%X is the read", SerialBuffer[i]);
i++;
} while (NoBytesRead > 0);
/*------------Printing the RXed String to Console----------------------*/
printf("\n\n ");
int j = 0;
for (j = 0; j < i - 1; j++) // j < i-1 to remove the dupliated last character
printf("%X are the values read", SerialBuffer[j]);
}
}
CloseHandle(hComm);//Closing the Serial Port
printf("\n ==========================================\n");
_getch();
}
我将其作为输入16 16 02 01 07 08 FF FF 01 00 01 00 FF FF值，我希望在超级终端中读取该值。但是我得到一些垃圾值。我希望在超级终端中使用相同的十六进制值。
答案 0 :(得分：0)
首先，您发送的只是数据。没有十进制或十六进制数据，您所拥有的只是二进制数据，即。 e。以字节为一组（通常为8组）存储的位。十进制或十六进制文字是一个值和相同（二进制）值的不同表示形式：
char a[] = { 0x61, 0x62, 0x63, 0 };
char b[] = { 97, 98, 99, 0 };
a和b现在将包含完全相同的值，如果解释为ASCII字符，则会出现这些值，以表示字符串“ abc” ...
但是，如果您打算以人类可读格式表示任意二进制数据（如Intel HEX files一样），那么您将需要用两个char来表示每个数据字节，例如。 G。将包含ASCII值为78的包含“ N”的数据字节转换为'4', 'e'或'4', 'E'的字节序列。
但是，这会使您的通信开销增加一倍，因此，我只会在 接收到数据后进行转换：
std::vector<char> received = readFromSerial();
// assuming arbitrary data..
for(auto c : received)
std::cout << std::setfill('0') << std::hex << std::setw(2)
<< static_cast<unsigned int>(static_cast<unsigned char>(c)) << std::endl;
旁注：您需要进行两次强制转换，以防止负数字符的符号扩展（至少在对char进行签名的情况下）。
是否应该使用有符号或无符号字符取决于要表示[-128; 127]或[0; 255]范围内的数据...