who can use MFC CSocket in console project sucessfully.

[茂奇软件]

I create a console project.
and create a MFC dll project, which support
socket in wizard dialog. and write a dll export
function. in which function I use the CSocket
to communicating with other application.
but. one exception will happened. while I call
CSocket server,client
...
server.Accept(client); // here exception happened.

who can give me a solution.
yours jansen.

[Jackzhu]

什么异常？

[茂奇软件]

I don't think it is a normal exception.

I will send you a demo in 2 days.
yours jansen.

[sintony]

try add in StdAfx.h
#include <afxsock.h> // MFC socket extensions

[netmare]

一个console程序由于没有消息循环,所以受到许多限制,其中之一就是不能使用定时器,而MFC为了实现Winsock的异步机制,在CAsyncSocket中偷偷为每个socket建立了一个窗口,这样就可以收到那些FD_XXX的消息了,CSocket提供了一种可以阻塞住的同步机制,为此CSocket自己偷着做了一个消息循环,还设了一个timer,问题就出在这里.
一下程序摘自MFC
BOOL CSocket::Accept(CAsyncSocket& rConnectedSocket, SOCKADDR* lpSockAddr, int* lpSockAddrLen)
{
if (m_pbBlocking != NULL)
{
WSASetLastError(WSAEINPROGRESS);
return FALSE;
}
while (!CAsyncSocket::Accept(rConnectedSocket, lpSockAddr, lpSockAddrLen))
{
if (GetLastError() == WSAEWOULDBLOCK)
{
if (!PumpMessages(FD_ACCEPT))
return FALSE;
}
else
return FALSE;
}
return TRUE;
}
BOOL CSocket::PumpMessages(UINT uStopFlag)
{
// The same socket better not be blocking in more than one place.
ASSERT(m_pbBlocking == NULL);

_AFX_SOCK_THREAD_STATE* pState = _afxSockThreadState;

ASSERT(pState->m_hSocketWindow != NULL);

BOOL bBlocking = TRUE;
m_pbBlocking = &bBlocking;
CWinThread* pThread = AfxGetThread();

// This is not a timeout in the WinSock sense, but more
// like a WM_KICKIDLE to keep message pumping alive
UINT nTimerID = ::SetTimer(pState->m_hSocketWindow, 1, m_nTimeOut, NULL);
//就是在这异的常,其实就算这里同的过,后面那个PeekMessage也不行
if (nTimerID == 0)
AfxThrowResourceException();

BOOL bPeek = TRUE;

while (bBlocking)
{
TRY
{
MSG msg;
if (::PeekMessage(&msg, pState->m_hSocketWindow,
...
所以你不能用在console程序中用MFC的CSocket(CAsyncSocket也不行,最好就不要用MFC,因为MFC是为GUI程序设计的),直接用socket吧.

[Jackzhu]

你将func函数如此改写即可消除异常
void __declspec( dllexport) func(void ){
AFX_MANAGE_STATE(AfxGetStaticModuleState( ));
CSocket server,client;