客户端能发消息给服务器，但服务器不能发给客户端

zhanlonglong 2011-06-30 10:59:08



void CTCPDlg::OnBnClickedOk()		//发送

{

	if (m_clientSocket.m_bConnected)//客户端

	{

		m_clientSocket.m_nLength=MsgEdit.GetWindowText

			(m_clientSocket.m_szBuffer, sizeof(m_clientSocket.m_szBuffer));

		m_clientSocket.AsyncSelect(FD_WRITE);

		MsgEdit.SetWindowText("");

	}

	else if(m_srvrSocket.m_bConnected)//服务器

	{

		m_srvrSocket.m_nLength=MsgEdit.GetWindowText

			(m_srvrSocket.m_szBuffer, sizeof(m_srvrSocket.m_szBuffer));

		/*int ret = m_srvrSocket.Send(m_srvrSocket.m_szBuffer, m_srvrSocket.m_nLength);

		if(ret == SOCKET_ERROR)

			if(GetLastError()==WSAEWOULDBLOCK)

				AfxMessageBox("The socket is marked as nonblocking and the requested operation would block");

			else if(GetLastError()==WSAEINVAL)

				AfxMessageBox("The socket has not been bound with Bind");

			else if(GetLastError()==WSAESHUTDOWN)

				AfxMessageBox("The socket has been shut down");

			else if(GetLastError()==WSAENOTCONN)

				AfxMessageBox("The socket is not connected");*/

		m_srvrSocket.AsyncSelect(FD_WRITE);

		MsgEdit.SetWindowText("");

	}

	else

		AfxMessageBox("Not Connected!");



}

void MySock::OnSend(int nErrorCode)

{

	Send(m_szBuffer,m_nLength,0);	

	m_nLength=0;

	memset(m_szBuffer,0,sizeof(m_szBuffer));

	//继续提请一个“读”的网络事件，接收Server消息

	AsyncSelect(FD_READ);

	CAsyncSocket::OnSend(nErrorCode);

}

看了两天，不知道哪里出错，单步调试发现，服务器端根本没有触发OnSend，而客户端正常。
如果加上上面的注释部分，服务器发送会提示"The socket is not connected"。
还请各位大侠救命！

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zhanlonglong 2011-06-30

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客户端和服务器的端口号应该一样还是不一样？

zhanlonglong 2011-06-30

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回4楼：
我上面说过了，错误码是WSAENOTCONN，"The socket is not connected“。

hahayezhe112 2011-06-30

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[Quote=引用 4 楼 zhanlonglong 的回复:]
回3楼：
我用的是MFC的CAsyncSocket类，你写的都用不到。。。
[/Quote]

既然是这个类那么就在错误的函数调用处判断下错误码是多少！
对照错误码MSDN的

zhanlonglong 2011-06-30

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回3楼：
我用的是MFC的CAsyncSocket类，你写的都用不到。。。

zhanlonglong 2011-06-30

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[Quote=引用 1 楼 shenyi0106 的回复:]

FD_SEND不是你手动触发滴，它是根据send函数来自动决定的，当有发送缓冲区时，自动触发FD_SEND消息，
也就是说，你可以先不要关心有没有FD_SEND,直接send，然后再FD_SEND中处理善后工作
[/Quote]
那为什么客户端那样写就是正确的？

liye378 2011-06-30

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#include <Winsock.h>

#include <windows.h>

#include <stdio.h>

#pragma comment(lib,"wsock32.lib")



#define PORT 2000



SOCKET sock,sock1;  // 1.建立一个监听端口 2.收到一个请求端口

sockaddr_in ServerAddr;

char buff[80];



DWORD WINAPI RECVWorkerThread(LPVOID pParam);

DWORD WINAPI SENDWorkerThread(LPVOID pParam);





int main()

{

	

	DWORD dwREVEThreadId,dwSENDThreadId; 



	WSADATA WSAData;

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

	

	ServerAddr.sin_family=AF_INET;

	ServerAddr.sin_addr.s_addr=htonl(INADDR_ANY);

	ServerAddr.sin_port=htons(PORT);



	sock=socket(AF_INET,SOCK_STREAM,0);

	bind(sock,(struct sockaddr FAR *)&ServerAddr,sizeof(ServerAddr));

	

	int Addrlen;

	Addrlen=sizeof(sockaddr_in);

	listen(sock,5);

	printf("I am server...\nlistening...\n");



	HANDLE RECVThreadHandle = CreateThread(NULL, 0, RECVWorkerThread, NULL, 0, &dwREVEThreadId);

	HANDLE SENDThreadHandle = CreateThread(NULL, 0, SENDWorkerThread, NULL, 0, &dwSENDThreadId);

	

	WaitForSingleObject(SENDThreadHandle, INFINITE);

	CloseHandle (SENDThreadHandle);

	WaitForSingleObject(RECVThreadHandle, INFINITE);

	CloseHandle (RECVThreadHandle);



	return 0;

}





DWORD WINAPI RECVWorkerThread(LPVOID lpParam)

{

	int Addrlen=sizeof(sockaddr_in);

	for (;;)

	{          

		sock1=accept(sock,(struct sockaddr FAR *)&ServerAddr,&Addrlen);

		for (;;)

		{

			memset(buff,0,80);

			if (recv(sock1,buff,80,0)<=0)

			{

				break;

			}

			printf(buff);

			printf("\n");

		}

	}

}





DWORD WINAPI SENDWorkerThread(LPVOID lpParam)

{

	for (;;)

	{

		printf("please input your message：(0----exit.)\n");

		memset(buff,0,80);

		gets(buff);

		send(sock1,buff,strlen(buff),0);

	}

	return 0;

}