C++实现json形式的Socket传输图片

本文实例为大家分享了C++实现json形式的Socket传输图片的具体代码,供大家参考,具体内容如下

大致流程:客户端读取图片,经过Base64编码,转成字符串的形式,保存到json中,通过socket传到服务端,然后Base64解码,再转换成图片

一.服务端

1.main.cpp

#include <iostream>

#include <stdio.h>

#include "Base64_1.h"

#include <winsock2.h>

#include "json1.hpp"

#pragma comment(lib,"ws2_32.lib")

using json = nlohmann::json;

char revData[3888888];

bool WritePhotoFile(std::basic_string<TCHAR> strFileName, std::string &strData)

{

HANDLE hFile;

hFile = CreateFile(strFileName.c_str(), GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);

if (hFile == INVALID_HANDLE_VALUE)

{

return false;

}

CBase64 base64;

int datalen(0);

DWORD dwritelen(0);

std::string strdcode = base64.Decode(strData.data(), strData.size(), datalen);

if (!WriteFile(hFile, strdcode.data(), datalen, &dwritelen, NULL))

{

CloseHandle(hFile);

return false;

}

CloseHandle(hFile);

return true;

}

int main(int argc, char* argv[])

{

//初始化WSA

WORD sockVersion = MAKEWORD(2, 2);

WSADATA wsaData;

if (WSAStartup(sockVersion, &wsaData) != 0)

{

return 0;

}

//创建套接字

SOCKET slisten = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

if (slisten == INVALID_SOCKET)

{

printf("socket error !");

return 0;

}

//绑定IP和端口

sockaddr_in sin;

sin.sin_family = AF_INET;

sin.sin_port = htons(8888);

sin.sin_addr.S_un.S_addr = INADDR_ANY;

if (bind(slisten, (LPSOCKADDR)&sin, sizeof(sin)) == SOCKET_ERROR)

{

printf("bind error !");

}

//开始监听

if (listen(slisten, 5) == SOCKET_ERROR)

{

printf("listen error !");

return 0;

}

//循环接收数据

SOCKET sClient;

sockaddr_in remoteAddr;

int nAddrlen = sizeof(remoteAddr);

//revData = (char*)malloc(sizeof(char) * 1000000);

int i = 1;

while (true)

{

printf("等待连接...\n");

sClient = accept(slisten, (SOCKADDR *)&remoteAddr, &nAddrlen);

if (sClient == INVALID_SOCKET)

{

printf("accept error !");

continue;

}

printf("接受到一个连接:%s \r\n", inet_ntoa(remoteAddr.sin_addr));

//接收数据

int ret = recv(sClient, revData, 3888888, 0);

if (ret > 0)

{

revData[ret] = 0x00;

json o = json::parse(revData);

for (json::iterator it = o.begin(); it != o.end(); ++it) {

//std::cout << it.key() << " : " << it.value() << "\n";

if (it.key() == "imgA"|| it.key() == "imgB")

{

std::string num = std::to_string(i++);

std::string strFileName = "D:\\"+ num +".jpg";

std::string val = it.value();

WritePhotoFile(strFileName, val);

}

}

//std::cout<< json::parse(revData)<< std::endl;

//printf(revData);

}

//发送数据

//const char * sendData = "你好,TCP客户端!\n";

//send(sClient, sendData, strlen(sendData), 0);

closesocket(sClient);

}

closesocket(slisten);

WSACleanup();

return 0;

}

2.Base64.cpp

#include"Base64_1.h"

CBase64::CBase64()

{

}

CBase64::~CBase64()

{

}

std::string CBase64::Encode(const char* Data, int DataByte)

{

//编码表

const char EncodeTable[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

//返回值

std::string strEncode;

unsigned char Tmp[4] = { 0 };

int LineLength = 0;

for (int i = 0; i<(int)(DataByte / 3); i++)

{

Tmp[1] = *Data++;

Tmp[2] = *Data++;

Tmp[3] = *Data++;

strEncode += EncodeTable[Tmp[1] >> 2];

strEncode += EncodeTable[((Tmp[1] << 4) | (Tmp[2] >> 4)) & 0x3F];

strEncode += EncodeTable[((Tmp[2] << 2) | (Tmp[3] >> 6)) & 0x3F];

strEncode += EncodeTable[Tmp[3] & 0x3F];

if (LineLength += 4, LineLength == 76) { strEncode += "\r\n"; LineLength = 0; }

}

//对剩余数据进行编码

int Mod = DataByte % 3;

if (Mod == 1)

{

Tmp[1] = *Data++;

strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2];

strEncode += EncodeTable[((Tmp[1] & 0x03) << 4)];

strEncode += "==";

}

else if (Mod == 2)

{

Tmp[1] = *Data++;

Tmp[2] = *Data++;

strEncode += EncodeTable[(Tmp[1] & 0xFC) >> 2];

strEncode += EncodeTable[((Tmp[1] & 0x03) << 4) | ((Tmp[2] & 0xF0) >> 4)];

strEncode += EncodeTable[((Tmp[2] & 0x0F) << 2)];

strEncode += "=";

}

return strEncode;

}

std::string CBase64::Decode(const char* Data, int DataByte, int& OutByte)

{

//解码表

const char DecodeTable[] =

{

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,

62, // '+'

0, 0, 0,

63, // '/'

52, 53, 54, 55, 56, 57, 58, 59, 60, 61, // '0'-'9'

0, 0, 0, 0, 0, 0, 0,

0, 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, // 'A'-'Z'

0, 0, 0, 0, 0, 0,

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, // 'a'-'z'

};

//返回值

std::string strDecode;

int nValue;

int i = 0;

while (i < DataByte)

{

if (*Data != '\r' && *Data != '\n')

{

nValue = DecodeTable[*Data++] << 18;

nValue += DecodeTable[*Data++] << 12;

strDecode += (nValue & 0x00FF0000) >> 16;

OutByte++;

if (*Data != '=')

{

nValue += DecodeTable[*Data++] << 6;

strDecode += (nValue & 0x0000FF00) >> 8;

OutByte++;

if (*Data != '=')

{

nValue += DecodeTable[*Data++];

strDecode += nValue & 0x000000FF;

OutByte++;

}

}

i += 4;

}

else// 回车换行,跳过

{

Data++;

i++;

}

}

return strDecode;

}

3.Base64_1.h

//++Base64.h

#pragma once

#include <string>

class CBase64

{

public:

public:

CBase64();

~CBase64();

/*编码

DataByte

[in]输入的数据长度,以字节为单位

*/

std::string Encode(const char* Data, int DataByte);

/*解码

DataByte

[in]输入的数据长度,以字节为单位

OutByte

[out]输出的数据长度,以字节为单位,请不要通过返回值计算

输出数据的长度

*/

std::string Decode(const char* Data, int DataByte, int& OutByte);

};

4.json.hpp 去网上下载吧,个人感觉比jsoncpp好用一些(我里面的json1.hpp就是json.hpp)

二.客户端

1.main.cpp

#include<WINSOCK2.H>

#include<STDIO.H>

#include<iostream>

#include<cstring>

#include <string>

#include <fstream>

#include "Bash64.h"

#include "json1.hpp"

using namespace std;

using json = nlohmann::json;

#pragma comment(lib, "ws2_32.lib")

char chBuf1[3888888], chBuf2[3888888];

int main()

{

FILE *fIn1, *fIn2;

int nRead1, nRead2;

WORD sockVersion = MAKEWORD(2, 2);

WSADATA data;

if (WSAStartup(sockVersion, &data) != 0)

{

return 0;

}

std::string num = std::to_string(1);

std::string chFileIn1 = "E:\\"+num+".jpg";

num = std::to_string(2);

std::string chFileIn2 = "E:\\" + num + ".jpg";

SOCKET sclient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

if (sclient == INVALID_SOCKET)

{

printf("invalid socket!");

return 0;

}

sockaddr_in serAddr;

serAddr.sin_family = AF_INET;

serAddr.sin_port = htons(8888);

serAddr.sin_addr.S_un.S_addr = inet_addr("192.168.3.72");

if (connect(sclient, (sockaddr *)&serAddr, sizeof(serAddr)) == SOCKET_ERROR)

{ //连接失败

printf("connect error !");

closesocket(sclient);

return 0;

}

char chFileIn3[100], chFileIn4[100];

strcpy(chFileIn3, chFileIn1.c_str());

strcpy(chFileIn4, chFileIn2.c_str());

fIn1 = fopen(chFileIn3, "rb");

fIn2 = fopen(chFileIn4, "rb");

if (fIn1 == NULL || fIn2 == NULL)

{

printf("打开读取文件失败");

return 0;

}

//读文件

json data1;

//fread()读取成功返回值为实际读回的数据个数(单位为Byte)

nRead1 = fread(chBuf1, sizeof(char), 3888888, fIn1);

nRead2 = fread(chBuf2, sizeof(char), 3888888, fIn2);

//base64编码 封装进json

string imgBase64_1 = base64_encode(chBuf1, nRead1);

string imgBase64_2 = base64_encode(chBuf2, nRead2);

data1["imgA"] = imgBase64_1;

data1["imgB"] = imgBase64_2;

fclose(fIn1);

fclose(fIn2);

//显式转换为string

std::string s = data1.dump();

const char * sendData;

sendData = s.c_str(); //string转const char*

//char * sendData = "你好,TCP服务端,我是客户端\n";

send(sclient, sendData, strlen(sendData), 0);

//send()用来将数据由指定的socket传给对方主机

//int send(int s, const void * msg, int len, unsigned int flags)

//s为已建立好连接的socket,msg指向数据内容,len则为数据长度,参数flags一般设0

//成功则返回实际传送出去的字符数,失败返回-1,错误原因存于error

char recData[266680];

int ret = recv(sclient, recData, 266680, 0);

if (ret>0) {

recData[ret] = 0x00;

//printf(recData);

}

closesocket(sclient);

WSACleanup();

system("pause");

return 0;

}

2.Bash64.h

#ifndef __BASE64_H__

#define __BASE64_H__

#include <iostream>

#include <string>

static const std::string base64_chars =

"ABCDEFGHIJKLMNOPQRSTUVWXYZ"

"abcdefghijklmnopqrstuvwxyz"

"0123456789+/";

static inline bool is_base64(const char c)

{

return (isalnum(c) || (c == '+') || (c == '/'));

}

std::string base64_encode(const char * bytes_to_encode, unsigned int in_len)

{

std::string ret;

int i = 0;

int j = 0;

unsigned char char_array_3[3];

unsigned char char_array_4[4];

while (in_len--)

{

char_array_3[i++] = *(bytes_to_encode++);

if (i == 3)

{

char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;

char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);

char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);

char_array_4[3] = char_array_3[2] & 0x3f;

for (i = 0; (i <4); i++)

{

ret += base64_chars[char_array_4[i]];

}

i = 0;

}

}

if (i)

{

for (j = i; j < 3; j++)

{

char_array_3[j] = '\0';

}

char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;

char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);

char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);

char_array_4[3] = char_array_3[2] & 0x3f;

for (j = 0; (j < i + 1); j++)

{

ret += base64_chars[char_array_4[j]];

}

while ((i++ < 3))

{

ret += '=';

}

}

return ret;

}

std::string base64_decode(std::string const & encoded_string)

{

int in_len = (int)encoded_string.size();

int i = 0;

int j = 0;

int in_ = 0;

unsigned char char_array_4[4], char_array_3[3];

std::string ret;

while (in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {

char_array_4[i++] = encoded_string[in_]; in_++;

if (i == 4) {

for (i = 0; i <4; i++)

char_array_4[i] = base64_chars.find(char_array_4[i]);

char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);

char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);

char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

for (i = 0; (i < 3); i++)

ret += char_array_3[i];

i = 0;

}

}

if (i) {

for (j = i; j <4; j++)

char_array_4[j] = 0;

for (j = 0; j <4; j++)

char_array_4[j] = base64_chars.find(char_array_4[j]);

char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);

char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);

char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];

for (j = 0; (j < i - 1); j++) ret += char_array_3[j];

}

return ret;

}

#endif

3.json.hpp  上面有链接(我里面的json1.hpp就是json.hpp)

Hit:服务端和客户端的Base64文件不一样,是因为当时服务端接收json时,Base64解码成图片出现了问题,又去找大神的博客,把服务端的Base64文件换了。然后能进行正常的传输图片,客户端就懒得换了~

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

以上是 C++实现json形式的Socket传输图片 的全部内容, 来源链接: utcz.com/p/245029.html

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