各位大侠，救救小弟，写了下面这段邮件群发后，邮件发到50多封，程序就down掉了，问题不明！！100分求救！！！

[bigbigbear]

各位大侠，救救小弟，写了下面这段邮件群发后，邮件发到50多封，程序就down掉了，问题不明！！100分求救！！！
#include <afxwin.h>
#include <afx.h>
#include <afxdb.h>
#include <stdio.h>
#include <winsock.h>

void sendmail(SOCKET sock,LPCTSTR mail_str,LPCTSTR mail_content)
{
char strResponse[255];
char strCommand[255];

char from[100]="[e-mail]";
char *to;

to=(LPSTR)mail_str;

strcpy(strCommand, "HELO localhost\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[HELO] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

strcpy(strCommand, "MAIL FROM:<");
strcat(strCommand, from);
strcat(strCommand,">\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[FROM] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

strcpy(strCommand, "RCPT TO:<");
strcat(strCommand, to);
strcat(strCommand,">\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[TO] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

strcpy(strCommand, "DATA\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[DATA] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

send(sock, mail_content, strlen(mail_content), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[Content] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

strcpy(strCommand,"\r\n.\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

strcpy(strCommand, "QUIT\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[QUIT] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

printf("[Success] %s\n",to);
}

void main()
{
CFile file;
CFileException ex;
char content[20000];
int cnt;
for(cnt=0;cnt<lstrlen(content);cnt++)
{
content[cnt] = ' ';
}

if(!file.Open("C:\\index.htm",CFile::modeRead,&ex))
{
TCHAR szError[1024];
ex.GetErrorMessage(szError, 1024);
printf("%s\n",szError);
file.Close();
return;
}
UINT Byte=file.Read(content,lstrlen(content));
file.Close();

char con_str[200];
char dbname[100];
char user[100];
char password[100];
CDatabase *Conn;

strcpy(dbname,"mail");
strcpy(user,"zsl");
strcpy(password,"2000");

sprintf(con_str,"DSN=%s;UID=%s;PWD=%s",dbname,user,password);
Conn=new CDatabase();
try
{
Conn->OpenEx(con_str,CDatabase::noOdbcDialog);
printf("[Success] ODBC have been connected!!\n");
}
catch(CDBException * e)
{
printf("Error is %s",e->m_strError);
}

CRecordset Rs(Conn);
Rs.Open(CRecordset::forwardOnly, _T("SELECT mail FROM chr_log"));
CString mail;
while(!Rs.IsEOF())
{
SOCKET sock;
struct sockaddr_in sin;

WSADATA wsadata;
WORD vVersionRequested;

vVersionRequested = MAKEWORD(2, 0);

if(WSAStartup(vVersionRequested, &wsadata))
{
printf("Socket Loading failed !Check it out !");
return;
}

if((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)
{
printf("Socket Create failed! Check it out !");
return;
}

sin.sin_addr.s_addr = inet_addr("127.0.0.1");
sin.sin_family = AF_INET;
sin.sin_port = htons(25);

if(connect(sock, (sockaddr *)&sin, sizeof(sockaddr)) == SOCKET_ERROR)
{
closesocket(sock);
printf("Failed to connect !Retry!!");
return;
}
Rs.GetFieldValue(short(0),mail);
printf("Mail is:%s\n",mail);
sendmail(sock, (LPCTSTR)mail, content);
closesocket(sock);
Rs.MoveNext();
}
Rs.Close();
Conn->Close();
return;
}

[danscort2000]

你自己不会用DEBUG看看哪个地方出问题了?
看看有没有内存泄露什么的,

[bigbigbear]

我对VC的IDE的使用不是很熟，debug的过程中我从watch中看不出任何对我有所帮助的信息，真是脸红阿，想请各位高手帮我分析一下，希望大家给我这个菜鸟点帮助，好吗？先谢谢楼上对我教诲！：）

[winter_sui]

我把程序拿下来，改了一下。
虽然不是从数据库里读取信息。但单步执行，发一个mail是没错的。

有可能是服务器把你给禁止了，你短时间内发的邮件太多了。

[zhanvi]

如果频繁的连接发送
有的服务器是会禁止你的ＩＰ的
不过５０封太少了
以前我做的程序都是发送５０００邮件才被封
程序ＤＯＷＮ掉可能是其他原因

[bigbigbear]

谢谢楼上各位的关注，可是我是用的自己本机架设的ＳＭＴＰ虚拟服务器阿，没有被封掉的理由阿，但是在Debug状态下会在发送content的时候，recv函数那一步down掉，不过是偶然现象，所以很有可能在发的多的时候，就会在这一步停下，不知道recv函数有什么要注意的事情阿？请各位高手帮帮我吧，我真的是为之已经肝脑涂地了。本以为是内存泄漏可是现在改了，还是不行，不知道为什么，郁闷～～

[bigbigbear]

后又修改后，还是差不多的情形，请各位帮忙看看，到底是什么问题呢？
#include <afxwin.h>
#include <afx.h>
#include <afxdb.h>
#include <stdio.h>
#include <memory.h>
#include <winsock.h>

void sendmail(SOCKET sock,LPCTSTR mail_str,LPCTSTR mail_content)
{
char strResponse[200];
char strCommand[200];
memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

char *to;

to=(LPSTR)mail_str;

sprintf(strCommand, "HELO localhost\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[HELO] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

sprintf(strCommand, "MAIL FROM:<[e-mail]>\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[FROM] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

sprintf(strCommand, "RCPT TO:<%s>\r\n",to);
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[TO] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

sprintf(strCommand, "DATA\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[DATA] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

send(sock, mail_content, strlen(mail_content), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[Content] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

sprintf(strCommand,"\r\n.\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

memset(strResponse,' ',sizeof(strResponse));
memset(strCommand,' ',sizeof(strCommand));

sprintf(strCommand, "QUIT\r\n");
send(sock, strCommand, lstrlen(strCommand), 0);
if(recv(sock, strResponse, lstrlen(strResponse), 0) == SOCKET_ERROR)
{
printf("Failed to connect!Check it out[QUIT] !!\n");
send(sock,"QUIT\r\n",7,0);
return;
}
//printf("%s\n",strResponse);

printf("[Success] %s\n",to);
}

void main()
{
CFile file;
CFileException ex;
char content[20000];
memset(content,' ',sizeof(content));

if(!file.Open("C:\\index.htm",CFile::modeRead,&ex))
{
TCHAR szError[1024];
ex.GetErrorMessage(szError, 1024);
printf("%s\n",szError);
file.Close();
return;
}
UINT Byte=file.Read(content,lstrlen(content));
file.Close();

char con_str[200];
char dbname[100];
char user[100];
char password[100];
CDatabase *Conn;

strcpy(dbname,"mail");
strcpy(user,"zsl");
strcpy(password,"2000");

sprintf(con_str,"DSN=%s;UID=%s;PWD=%s",dbname,user,password);
Conn=new CDatabase();
try
{
Conn->OpenEx(con_str,CDatabase::noOdbcDialog);
printf("[Success] ODBC have been connected!!\n");
}
catch(CDBException * e)
{
printf("Error is %s",e->m_strError);
}

CRecordset Rs(Conn);
Rs.Open(CRecordset::forwardOnly, _T("SELECT email FROM chr_log"));
CString mail;
while(!Rs.IsEOF())
{
SOCKET sock;
struct sockaddr_in sin;

WSADATA wsadata;
WORD vVersionRequested;

vVersionRequested = MAKEWORD(2, 0);

if(WSAStartup(vVersionRequested, &wsadata))
{
printf("Socket Loading failed !Check it out !");
return;
}

if((sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) == INVALID_SOCKET)
{
printf("Socket Create failed! Check it out !");
return;
}

sin.sin_addr.s_addr = inet_addr("127.0.0.1");
sin.sin_family = AF_INET;
sin.sin_port = htons(25);

if(connect(sock, (sockaddr *)&sin, sizeof(sockaddr)) == SOCKET_ERROR)
{
closesocket(sock);
printf("Failed to connect !Retry!!");
return;
}
Rs.GetFieldValue(short(0),mail);
printf("Mail is:%s\n",mail);
sendmail(sock, (LPCTSTR)mail, content);
closesocket(sock);
Rs.MoveNext();
}
Rs.Close();
Conn->Close();
return;
}

[dreamchild]

mark

[bigbigbear]

不是吧，各位大侠，小弟能力有限阿，帮帮我吧～～：（

[UDX协议]

strResponse,
strCommand
缓冲区短了。越界造成

[bigbigbear]

楼上的大侠，我现在把strResponse设置成了1000000,现在能发很多封了，但是还是无法完全发送成功，不知哪位高手再帮忙找找问题，或者教授我如何来追踪这种异常。谢谢楼上的帮忙，让我看到了曙光！

[zhanvi]

什么是无法完全发送成功阿

[jawibn]

mark

[bigbigbear]

mark???对不起各位高手这是什么意思？？我深知我很菜

[bigbigbear]

完全发送就是没有把数据库中的所有的邮件地址都发送一遍，发到几百封时就停掉了

[rainsly]

up

[bigbigbear]

这么久也没有人给我答复啊。。。。

[zhanvi]

就是说线程死掉了
可能服务器SOKET没有响应造成你的SOCKET阻塞