【发布时间】：2013-12-18 08:57:24
【问题描述】：
这是我第一次发布我的查询。我需要帮助。任何帮助表示赞赏。
我同意我已经把我的概率说得很长了。但很抱歉，我不知道如何缩短它，我的目的是提供有关我的问题的完整信息。
问题： 我必须在 Windows 平台上使用 USB 转串口适配器在两台笔记本电脑之间进行通信。我写了两个程序，一个用于发送，另一个用于接收。程序是用 C 和 C# 两种编程语言编写的。
使用 C 语言： 我能够使用下面提到的 C 程序成功地进行通信。但问题是速度。通过 150MB 大约需要 1 小时（60 分钟）。任何人请帮助我提高该程序的性能，或者您可以向我建议其他强大且性能高的方法。我还提到了一些 cmets 以及用于自我理解的程序。
带串口的笔记本电脑上的发送文件：
#include <stdio.h>
#include <bios.h>
#include <conio.h>
#define COM1 0
#define DATA_READY 0x100
#define TRUE 1
#define FALSE 0
#define SETTINGS ( 0xE0 | 0x03 | 0x00 | 0x00)
int main(void)
{
int in, out, status, DONE = FALSE,i=0;
char c;
FILE *fp,*fp1;
unsigned long count = 0,shiftcount = 0;
clrscr();
fp = fopen("C:/TC/pic.jpg","rb"); //opened for reading actual content
fp1 = fopen("C:/TC/pic.jpg","rb"); //opened for reading the size of file
fseek(fp1,0L,2);
count = ftell(fp1) + 1; // file size
bioscom(0, SETTINGS, COM1); // initializing the port
printf("No. of Characters = %lu\n",count);
// since bioscom function can send or receive only 8bits at a time, am sending file size in
4 rounds so that we can send at max of 4GB file.
bioscom(1,count,COM1); // sneding 1st lower 8bits
bioscom(1,count>>8,COM1); // sending 2nd set of lower 8bits
bioscom(1,count>>16,COM1); // sending 3rd set of lower 8bits
bioscom(1,count>>24,COM1); // sending upper 8 bits
cprintf("... BIOSCOM [ESC] to exit ...\n");
while (!DONE)
{
status = bioscom(3, 0, COM1);// get the status of port
//printf("%d",status);
if (status & DATA_READY) //checks if data is ready
{
out = bioscom(2, 0, COM1); // receives the ack
if(!feof(fp))
{
c = fgetc(fp); //read character by character from file
bioscom(1,c,COM1);//send character to receiver
putch(c);//display
}
}
//to interrupt
if (kbhit())
{
if ((in = getch()) == '\x1B')
DONE = TRUE;
}
}
fclose(fp);
return 0;
}
通过 USB 端口在笔记本电脑上接收文件：
#include <stdio.h>
#include <bios.h>
#include <conio.h>
#define COM4 3
#define DATA_READY 0x100
#define TRUE 1
#define FALSE 0
#define SETTINGS ( 0xE0 | 0x03 | 0x00 | 0x00)
int main(void)
{
int in, out, status;
char c;
FILE *fp;
unsigned long shiftcount1=0,shiftcount2=0,shiftcount3=0,shiftcount4=0;
unsigned long count = 0, DONE = 1;
clrscr();
fp = fopen("C:/TC/pic1.jpg","wb");// file opened for writing
bioscom(0, SETTINGS, COM4);//initialize tyhe port
cprintf("... BIOSCOM [ESC] to exit ...\n");
//receives all the 32 bits of file size sent from sender
shiftcount1 = bioscom(2,0,COM4);
shiftcount2 = bioscom(2,0,COM4);
shiftcount3 = bioscom(2,0,COM4);
shiftcount4 = bioscom(2,0,COM4);
//send an ack
bioscom(1,'x',COM4);
count = shiftcount1 | (shiftcount2<<8) | (shiftcount3<<16) | (shiftcount4<<24);
printf("shift4 = %lu\tshift3 = %lu\tshift2 = %lu\tshift1 = %lu\n",shiftcount4,shiftcount3,shiftcount2,shiftcount1);
printf("File Size = %lu\n",count);
//loop till the size of the file
while (DONE < count)
{
status = bioscom(3, 0, COM4);// check the status
// printf("%d",status);
if (status & DATA_READY)//check for data ready at the port
{
out = bioscom(2, 0, COM4);//receive the data
DONE++;
fputc(out,fp);
putch(out);
bioscom(1,'x',COM4);//send an ack
}
if (kbhit())
{
if ((in = getch()) == '\x1B')
break;
}
}
fclose(fp);
return 0;
}
在带有 USB 端口的笔记本电脑上发送文件：
#include <stdio.h>
#include <bios.h>
#include <conio.h>
#include<dos.h>
#include<stdlib.h>
#include<time.h>
#define RTS 0x02
#define COM1 0
#define COM4 3
#define CURRCOM COM4
#define DATA_READY 0x100
#define TRUE 1
#define FALSE 0
#define SETTINGS ( 0xE0 | 0x03 | 0x00 | 0x00)
int main(void)
{
int in, out, status, DONE = FALSE,nextfile = 1;
char c;
FILE *fp,*fp1;
unsigned long count = 0,shiftcount = 0;
clock_t start,end;
start = clock();
clrscr();
fp = fopen("C:/TC/pic.jpg","rb");
fp1 = fopen("C:/TC/pic.jpg","rb");
fseek(fp1,0L,2);
count = ftell(fp1) + 1;
bioscom(0, SETTINGS, CURRCOM);
/* while(!feof(fp1))
{
c = fgetc(fp1);
count++;
} */
printf("No. of Cheracters = %lu\n",count);
bioscom(1,count,CURRCOM);
bioscom(1,count>>8,CURRCOM);
bioscom(1,count>>16,CURRCOM);
bioscom(1,count>>24,CURRCOM);
cprintf("\n... BIOSCOM [ESC] to exit ...\n");
while (!DONE)
{
status = bioscom(3, 0, CURRCOM);
if (status & DATA_READY)
{
out = bioscom(2,0,CURRCOM);
if(!feof(fp))
{
c = fgetc(fp);
bioscom(1,c,CURRCOM);
putch(c);
}
}
if (kbhit())
{
if ((in = getch()) == '\x1B')
DONE = TRUE;
}
}
fclose(fp);
end = clock();
printf("\nTotal time = %d\n",(end - start)/CLK_TCK);
return 0;
}
带串口的笔记本电脑上的接收文件：
#include <stdio.h>
#include <bios.h>
#include <conio.h>
#include<time.h>
#define COM1 0
#define DATA_READY 0x100
#define TRUE 1
#define FALSE 0
#define SETTINGS ( 0xE0 | 0x03 | 0x00 | 0x00)
int main(void)
{
int in, out, status;
char c;
FILE *fp;
int y = 0,esc;
unsigned long count=0,shiftcount1 = 0,shiftcount2 = 0,shiftcount3 = 0,shiftcount4 = 0, DONE = 1;
clock_t start,end;
start = clock();
clrscr();
fp = fopen("C:/TC/pic1.jpg","wb");
bioscom(0, SETTINGS, COM1);
cprintf("... BIOSCOM [ESC] to exit ...\n");
shiftcount1 = bioscom(2,0,COM1);
shiftcount2 = bioscom(2,0,COM1);
shiftcount3 = bioscom(2,0,COM1);
shiftcount4 = bioscom(2,0,COM1);
bioscom(1,'x',COM1);
count = shiftcount1 | (shiftcount2<<8) | (shiftcount3<<16) | (shiftcount4<<24);
printf("shift4 = %lu\tshift3 = %lu\tshift2 = %lu\t shift1 = %lu\n",shiftcount4,shiftcount3,shiftcount2,shiftcount1);
printf("file size = %lu\n",count);
while (DONE < count)
{
status = bioscom(3, 0, COM1);
//printf("%d",status);
if (status & DATA_READY)
{
out = bioscom(2, 0, COM1);
DONE++;
fputc(out,fp);
putch(out);
bioscom(1,'x',COM1);
}
if (kbhit())
{
if ((in = getch()) == '\x1B')
break;
}
}
fclose(fp);
end = clock();
printf("\nTotal time = %f\n",(end - start)/CLK_TCK);
return 0;
}
上述 4 个程序的行为是，发送者发送一个字符，并为每个字符接收一个 ack。我采用了这种方法，但其他方法无法正常工作（从某种意义上说，没有发送完整的数据，发送的数据量是不可判断的，因为它会因时间而异）。当我使用这种方法时效果很好。
使用 C# 语言： 下面两个程序是使用 Visual Studio 用 C# 编写的。我使用了 SerilaPort 类，它的属性和通信方法。使用它，我能够成功地在双方通信文本和xml文件。还有.jpg扩展名的图像文件，可以从USB传输到串口而不会丢失任何数据（成功传输），但是如果我从串口传输到usb端，能接收到有一些数据丢失的图像，即使数据丢失也能看到图像。
带串口的笔记本电脑上的发送文件：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.IO;
using System.Threading;
namespace Communication
{
class Program
{
static void Main(string[] args)
{
string name;
string message;
StringComparer stringComparer = StringComparer.OrdinalIgnoreCase;
//Thread readThread = new Thread(Read);
FileStream fs = new FileStream("C:/text.xml", FileMode.Open);
//StreamReader sr = new StreamReader(fs);
BinaryReader br = new BinaryReader(fs);
// Create a new SerialPort object with default settings.
SerialPort _serialPort = new SerialPort();
// Allow the user to set the appropriate properties.
_serialPort.PortName = "COM1";
_serialPort.BaudRate = 115200;
_serialPort.Parity = Parity.None;
_serialPort.DataBits = 8;
_serialPort.StopBits = StopBits.One;
_serialPort.Handshake = Handshake.None;
// Set the read/write timeouts
_serialPort.ReadTimeout = 500;
_serialPort.WriteTimeout = 500;
_serialPort.Open();
bool _continue = true;
//readThread.Start();
int len = (int)fs.Length;
char[] data = new char[len+1];
br.Read(data, 0, len);
for (int i = 0; i < len+1; i++)
{
_serialPort.Write(data, i, 1);
//Console.Write(data,i,1);
}
br.Close();
fs.Close();
_serialPort.Close();
}
}
}
带 USB 端口的笔记本电脑上的接收器文件：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO.Ports;
using System.IO;
using System.Threading;
using System.Collections;
namespace Communication
{
class Program
{
static void Main(string[] args)
{
SerialComm comm = new SerialComm();
comm.Init();
comm.ReadSerial();
comm.WriteToFile();
comm.ResClose();
Console.ReadKey();
}
}
class SerialComm
{
FileStream fs = null;
BinaryWriter file = null;
ArrayList al = null;
public Boolean Init()
{
if (fs == null)
{
fs = new FileStream("C:/text1.txt", FileMode.OpenOrCreate);
}
if (file == null)
{
file = new BinaryWriter(fs);
}
if (al == null)
{
al = new ArrayList();
}
return true;
}
public void ResClose()
{
file.Close();
fs.Close();
}
public Boolean ReadSerial()
{
SerialPort port;
StreamWriter sw;
ConsoleKeyInfo ck;
port = new SerialPort();
port.PortName = "COM4";
port.BaudRate = 115200;
port.DataBits = 8;
port.Parity = Parity.None;
port.StopBits = StopBits.One;
port.Handshake = Handshake.None;
port.Open();
port.BaseStream.Flush();
port.DiscardInBuffer();
int c = 1;
while (c != 0)
{
c = port.ReadByte();
al.Add((byte)c);
}
return true;
}
public void WriteToFile()
{
int i = 0;
byte[] message = al.ToArray(typeof(byte)) as byte[];
file.Write(message, 0, message.Length - 1);
}
}
}
请帮助我。
提前致谢。
【问题讨论】：
-
是的，我同意....但是第一个 4 个程序包括 2 个发送者和 2 个接收者，它们非常相似，只有端口号不同。我发布只是为了不混淆，如果有人真的在寻找交流，他们会使用它。
-
所以在 115200 波特，当您等待每个字符回显时。你考虑过前向纠错吗？循环冗余校验？也许看看 Kermit 协议？
-
@MarkU：平均速度显然是 150 Mbyte/60 分钟，所以 2.5 Mbyte/分钟而不是秒。显然你不能以 115.200 波特率发送 20.000.000 位/秒。
-
对问题格式的建议：从问题开始，不要为成为新用户而道歉。当我们的读者将鼠标悬停在托盘中的主主题行上时，第一段是人们在决定是否深入到实际消息之前看到的内容。
-
投票结束。无法在软件中修复不适当的硬件选择。