C语言发送邮件

基本框架就是这，需要其他功能自己添加吧

C语凳纤言实现简单的SMTP发送邮件

#include <windows.h>

#include <stdio.h>

#include <WinSock.h>

#include <iostream>

using namespace std

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

struct Base64Date6

{

unsigned int d4:6

unsigned int d3:6

unsigned int d2:6

unsigned int d1:6

}

// 协议中加密部分使用的是base64方法

char ConvertToBase64 (char c6)

void EncodeBase64 (char *dbuf, char *buf128, int len)

void SendMail (char *email,char *body)

int OpenSocket (struct sockaddr *addr)

int main()

{

char EmailTo[] = "hanyinlong@126.com"

char EmailContents[] = "From: \"lucy\"<hanyinlong@126.com>\r\n"

"To: \"dasiy\"<hanyinlong@126.com>\r\n"

"信蠢Subject: Hello\枣坦仿r\n\r\n"

"Hello World, Hello Email!"

SendMail(EmailTo, EmailContents)

return 0

}

char ConvertToBase64(char uc)

{

if(uc <26)

{

return 'A' + uc

}

if(uc <52)

{

return 'a' + (uc - 26)

}

if(uc <62)

{

return '0' + (uc - 52)

}

if(uc == 62)

{

return '+'

}

return '/'

}

// base64的实现

void EncodeBase64(char *dbuf, char *buf128, int len)

{

struct Base64Date6 *ddd = NULL

int i= 0

char buf[256] = {0}

char *tmp = NULL

char cc = '\0'

memset(buf, 0, 256)

strcpy_s(buf, 256, buf128)

for(i = 1i <= len/3i++)

{

tmp = buf + (i-1)*3

cc = tmp[2]

tmp[2] = tmp[0]

tmp[0] = cc

ddd = (struct Base64Date6 *)tmp

dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1)

dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2)

dbuf[(i-1)*4+2] = ConvertToBase64((unsigned int)ddd->d3)

dbuf[(i-1)*4+3] = ConvertToBase64((unsigned int)ddd->d4)

}

if(len % 3 == 1)

{

tmp = buf + (i-1)*3

cc = tmp[2]

tmp[2] = tmp[0]

tmp[0] = cc

ddd = (struct Base64Date6 *)tmp

dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1)

dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2)

dbuf[(i-1)*4+2] = '='

dbuf[(i-1)*4+3] = '='

}

if(len%3 == 2)

{

tmp = buf+(i-1)*3

cc = tmp[2]

tmp[2] = tmp[0]

tmp[0] = cc

ddd = (struct Base64Date6 *)tmp

dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1)

dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2)

dbuf[(i-1)*4+2] = ConvertToBase64((unsigned int)ddd->d3)

dbuf[(i-1)*4+3] = '='

}

return

}

// 发送邮件

void SendMail(char *email, char *body)

{

int sockfd = {0}

charbuf[1500] = {0}

charrbuf[1500] = {0}

charlogin[128] = {0}

charpass[128] = {0}

WSADATA WSAData

struct sockaddr_in their_addr = {0}

WSAStartup(MAKEWORD(2, 2), &WSAData)

memset(&their_addr, 0, sizeof(their_addr))

their_addr.sin_family = AF_INET

their_addr.sin_port = htons(25)

hostent* hptr = gethostbyname("smtp.126.com")

memcpy(&their_addr.sin_addr.S_un.S_addr, hptr->h_addr_list[0], hptr->h_length)

printf("IP of smpt.126.com is : %d:%d:%d:%d\n",

their_addr.sin_addr.S_un.S_un_b.s_b1,

their_addr.sin_addr.S_un.S_un_b.s_b2,

their_addr.sin_addr.S_un.S_un_b.s_b3,

their_addr.sin_addr.S_un.S_un_b.s_b4)

// 连接邮件服务器，如果连接后没有响应，则2 秒后重新连接

sockfd = OpenSocket((struct sockaddr *)&their_addr)

memset(rbuf, 0, 1500)

while(recv(sockfd, rbuf, 1500, 0) == 0)

{

cout<<"reconnect..."<<endl

Sleep(2)

sockfd = OpenSocket((struct sockaddr *)&their_addr)

memset(rbuf, 0, 1500)

}

cout<<rbuf<<endl

// EHLO

memset(buf, 0, 1500)

sprintf_s(buf, 1500, "EHLO HYL-PC\r\n")

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"EHLO REceive: "<<rbuf<<endl

// AUTH LOGIN

memset(buf, 0, 1500)

sprintf_s(buf, 1500, "AUTH LOGIN\r\n")

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"Auth Login Receive: "<<rbuf<<endl

// USER

memset(buf, 0, 1500)

sprintf_s(buf, 1500, "hanyinlong@126.com")//你的邮箱账号

memset(login, 0, 128)

EncodeBase64(login, buf, strlen(buf))

sprintf_s(buf, 1500, "%s\r\n", login)

send(sockfd, buf, strlen(buf), 0)

cout<<"Base64 UserName: "<<buf<<endl

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"User Login Receive: "<<rbuf<<endl

// PASSWORD

sprintf_s(buf, 1500, "XXXXXXXXXXXX")//你的邮箱密码

memset(pass, 0, 128)

EncodeBase64(pass, buf, strlen(buf))

sprintf_s(buf, 1500, "%s\r\n", pass)

send(sockfd, buf, strlen(buf), 0)

cout<<"Base64 Password: "<<buf<<endl

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"Send Password Receive: "<<rbuf<<endl

// MAIL FROM

memset(buf, 0, 1500)

sprintf_s(buf, 1500, "MAIL FROM: <hanyinlong@126.com>\r\n")

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"set Mail From Receive: "<<rbuf<<endl

// RCPT TO 第一个收件人

sprintf_s(buf, 1500, "RCPT TO:<%s>\r\n", email)

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"Tell Sendto Receive: "<<rbuf<<endl

// DATA 准备开始发送邮件内容

sprintf_s(buf, 1500, "DATA\r\n")

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"Send Mail Prepare Receive: "<<rbuf<<endl

// 发送邮件内容，\r\n.\r\n内容结束标记

sprintf_s(buf, 1500, "%s\r\n.\r\n", body)

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"Send Mail Receive: "<<rbuf<<endl

// QUIT

sprintf_s(buf, 1500, "QUIT\r\n")

send(sockfd, buf, strlen(buf), 0)

memset(rbuf, 0, 1500)

recv(sockfd, rbuf, 1500, 0)

cout<<"Quit Receive: "<<rbuf<<endl

//清理工作

closesocket(sockfd)

WSACleanup()

return

}

// 打开TCP Socket连接

int OpenSocket(struct sockaddr *addr)

{

int sockfd = 0

sockfd=socket(PF_INET, SOCK_STREAM, 0)

if(sockfd <0)

{

cout<<"Open sockfd(TCP) error!"<<endl

exit(-1)

}

if(connect(sockfd, addr, sizeof(struct sockaddr)) <0)

{

cout<<"Connect sockfd(TCP) error!"<<endl

exit(-1)

}

return sockfd

}

C语言发送邮件 完整代码：

#include <windows.h>

#include <stdio.h>

#include <WinSock.h>

#include <iostream>

using namespace std

#pragma  comment(lib, "ws2_32.lib")

struct Base64Date6

{

    unsigned int d4:6

    unsigned int d3:6

    unsigned int d2:6

    unsigned int d1:6

}

// 协议中加密部分使用的是base64方法

char ConvertToBase64  (char   c6)

void EncodeBase64     (char   *dbuf, char *buf128, int len)

void SendMail         (char   *email,char *body)

int 岁明 OpenSocket       (struct sockaddr *addr)

int main()

{

    char EmailTo[]         = "xushiladeng@qq.com"

    char EmailContents[]   = "From: \"lucy\"<xushiladeng@qq.com>\r\n"

        "To: \"dasiy\"<xushiladeng@qq.com>\r\n"

        "Subject: Hello\r\n\r\n"

        "Hello World, Hello Email!"

//        "DATA\r\n" //告诉服务器下面是邮件

        //下面是邮件头

        "TO: xushiladeng@qq.com\r\n"

        "FROM: xushiladeng@qq.com\r\n"

        "SUBJECT: SMTP协议测试\r\n"

        "Date:2015-04-20\r\n"

        "X-Mailer:fice's mailer\r\n"

        "MIMI-Version:1.0\r\n"

        "Content-Type:multipart/mixedboundary=\"#BOUNDARY#\"\r\n\r\n"乎枝告//设置边界值，区分邮件内容的 两个回车换行

        "Content-Transfer-Encoding:7bit\r\n\r\n"

        "This is a multi-part message in MIME format\r\n\r\n"

        //发送邮件内容头部信息

        "--#BOUNDARY#\r\n"

        "Content-Type: text/plaincharset=gb2312\r\n"

        "Content-Transfer-Encoding:printable\r\n\r\n"

        //发送邮件的内容部分

        "SMTP协议测试：发送附件/n----by fice 2015.04.20\r\n"

        //发送附件头部信息

        "--#BOUNDARY#\r\n"

        "Content-Type:text/plainname=student.txt\r\n"

        "Content-Transfer-Encoding:base64\r\n"

        "Content-Disposition:attachmentfilename=\"test.txt\"\r\n\r\n"

    SendMail(EmailTo, EmailContents)

    return 0

}

char ConvertToBase64(char uc)

{

    if(uc < 26)

    {

        return 'A' + uc

    }

    if(uc < 52)

    {

        return 'a' + (uc - 26)

    }

    if(uc < 62)

    {

        return '0' + (uc - 52)

    }

    if(uc == 62)

    {

        return '+'

    }

    return '/'

}

// base64的实现

void EncodeBase64(char *dbuf, char *buf128, int len)

{

    struct Base64Date6 *ddd      = NULL

    int           i        = 0

    char          buf[256] = {0}

    char          *tmp     = NULL

    char          cc       = '\0'

    memset(buf, 0, 256)

    strcpy_s(buf, 256, buf128)

    for(i = 1 i <= len/3 i++)

    {

        tmp             = buf + (i-1)*3

        cc    搭卖          = tmp[2]

        tmp[2]          = tmp[0]

        tmp[0]          = cc

        ddd             = (struct Base64Date6 *)tmp

        dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1)

        dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2)

        dbuf[(i-1)*4+2] = ConvertToBase64((unsigned int)ddd->d3)

        dbuf[(i-1)*4+3] = ConvertToBase64((unsigned int)ddd->d4)

    }

    if(len % 3 == 1)

    {

        tmp             = buf + (i-1)*3

        cc              = tmp[2]

        tmp[2]          = tmp[0]

        tmp[0]          = cc

        ddd             = (struct Base64Date6 *)tmp

        dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1)

        dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2)

        dbuf[(i-1)*4+2] = '='

        dbuf[(i-1)*4+3] = '='

    }

    if(len%3 == 2)

    {

        tmp             = buf+(i-1)*3

        cc              = tmp[2]

        tmp[2]          = tmp[0]

        tmp[0]          = cc

        ddd             = (struct Base64Date6 *)tmp

        dbuf[(i-1)*4+0] = ConvertToBase64((unsigned int)ddd->d1)

        dbuf[(i-1)*4+1] = ConvertToBase64((unsigned int)ddd->d2)

        dbuf[(i-1)*4+2] = ConvertToBase64((unsigned int)ddd->d3)

        dbuf[(i-1)*4+3] = '='

    }

    return

}

// 发送邮件

void SendMail(char *email, char *body)

{

    int     sockfd     = {0}

    char    buf[1500]  = {0}

    char    rbuf[1500] = {0}

    char    login[128] = {0}

    char    pass[128]  = {0}

    WSADATA WSAData

    struct sockaddr_in their_addr = {0}

    WSAStartup(MAKEWORD(2, 2), &WSAData)

    memset(&their_addr, 0, sizeof(their_addr))

    their_addr.sin_family = AF_INET

    their_addr.sin_port   = htons(25)

    hostent* hptr         = gethostbyname("smtp.126.com") 

    memcpy(&their_addr.sin_addr.S_un.S_addr, hptr->h_addr_list[0], hptr->h_length) 

    printf("IP of smpt.126.com is : %d:%d:%d:%d\n", 

        their_addr.sin_addr.S_un.S_un_b.s_b1, 

        their_addr.sin_addr.S_un.S_un_b.s_b2, 

        their_addr.sin_addr.S_un.S_un_b.s_b3, 

        their_addr.sin_addr.S_un.S_un_b.s_b4) 

    // 连接邮件服务器，如果连接后没有响应，则2 秒后重新连接

    sockfd = OpenSocket((struct sockaddr *)&their_addr)

    memset(rbuf, 0, 1500)

    while(recv(sockfd, rbuf, 1500, 0) == 0)

    {

        cout<<"reconnect..."<<endl

        Sleep(2)

        sockfd = OpenSocket((struct sockaddr *)&their_addr)

        memset(rbuf, 0, 1500)

    }

    cout<<rbuf<<endl

    // EHLO

    memset(buf, 0, 1500)

    sprintf_s(buf, 1500, "EHLO HYL-PC\r\n")

    send(sockfd, buf, strlen(buf), 0)

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"EHLO REceive: "<<rbuf<<endl

    // AUTH LOGIN

    memset(buf, 0, 1500)

    sprintf_s(buf, 1500, "AUTH LOGIN\r\n")

    send(sockfd, buf, strlen(buf), 0)

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"Auth Login Receive: "<<rbuf<<endl

    // USER

    memset(buf, 0, 1500)

    sprintf_s(buf, 1500, "xushiladeng@qq.com")//你的邮箱账号

    memset(login, 0, 128)

    EncodeBase64(login, buf, strlen(buf))

    sprintf_s(buf, 1500, "%s\r\n", login)

    send(sockfd, buf, strlen(buf), 0)

    cout<<"Base64 UserName: "<<buf<<endl

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"User Login Receive: "<<rbuf<<endl

    // PASSWORD

    sprintf_s(buf, 1500, "********")//你的邮箱密码

    memset(pass, 0, 128)

    EncodeBase64(pass, buf, strlen(buf))

    sprintf_s(buf, 1500, "%s\r\n", pass)

    send(sockfd, buf, strlen(buf), 0)

    cout<<"Base64 Password: "<<buf<<endl

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"Send Password Receive: "<<rbuf<<endl

    // MAIL FROM

    memset(buf, 0, 1500)

    sprintf_s(buf, 1500, "MAIL FROM: <xushiladeng@qq.com>\r\n")

    send(sockfd, buf, strlen(buf), 0)

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"set Mail From Receive: "<<rbuf<<endl

    // RCPT TO 第一个收件人

    sprintf_s(buf, 1500, "RCPT TO:<%s>\r\n", email)

    send(sockfd, buf, strlen(buf), 0)

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"Tell Sendto Receive: "<<rbuf<<endl

    // DATA 准备开始发送邮件内容

    sprintf_s(buf, 1500, "DATA\r\n")

    send(sockfd, buf, strlen(buf), 0)

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"Send Mail Prepare Receive: "<<rbuf<<endl

    // 发送邮件内容，\r\n.\r\n内容结束标记

    sprintf_s(buf, 1500, "%s\r\n.\r\n", body)

    send(sockfd, buf, strlen(buf), 0)//发送邮件，不带附件的内容

    //用二进制方式读取附件文件内容并转为base64格式  

    FILE* pf = fopen("D:\\test.txt","rb")

    fseek(pf,0,SEEK_END)

    int filelen = ftell(pf)

    char* filebuf = (char*) malloc(filelen)

    char* filebase64 = (char*) malloc(filelen*2)

    memset(filebase64,0,filelen*2)

    fseek(pf,0,SEEK_SET)

    fread(filebuf,1,filelen,pf)  

    EncodeBase64(filebase64,filebuf,filelen) 

    send(sockfd, filebase64, strlen(filebase64), 0)//发送邮件的内容

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"Send Mail Receive: "<<rbuf<<endl

    // QUIT

    sprintf_s(buf, 1500, "QUIT\r\n")

    send(sockfd, buf, strlen(buf), 0)

    memset(rbuf, 0, 1500)

    recv(sockfd, rbuf, 1500, 0)

    cout<<"Quit Receive: "<<rbuf<<endl

    //清理工作

    closesocket(sockfd)

    WSACleanup()

    return

}

// 打开TCP Socket连接

int OpenSocket(struct sockaddr *addr)

{

    int sockfd = 0

    sockfd=socket(PF_INET, SOCK_STREAM, 0)

    if(sockfd < 0)

    {

        cout<<"Open sockfd(TCP) error!"<<endl

        exit(-1)

    }

    if(connect(sockfd, addr, sizeof(struct sockaddr)) < 0)

    {

        cout<<"Connect sockfd(TCP) error!"<<endl

        exit(-1)

    }

    return sockfd

}

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