我做了正常(?)步驟的tcp套接字連接,如下面的代碼所示。但發送有時導致錯誤,而服務器端打印一些日誌,說連接,我不知道我的代碼有什麼問題。任何幫助表示讚賞。 有關穩定和可靠的Windows套接字編程的任何信息,讚賞。爲什麼我的winsocks2有時會發送10057錯誤的結果?
MSDN描述約10057錯誤:
Socket is not connected.A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using sendto) no address was supplied. Any other type of operation might also return this error—for example, setsockopt setting SO_KEEPALIVE if the connection has been reset.
PS:在下面的代碼段的真實IP地址是由127.0.0.1取代。代碼不可運行。
int connect_to_server() {
SOCKET soc;
SOCKADDR_IN serveraddr;
SOCKADDR_IN clientaddr;
unsigned char buf[1024];
WSADATA wsa;
WSAStartup(MAKEWORD(2, 2), &wsa);
/* create a tcp socket; */
if ((soc = socket(AF_INET, SOCK_STREAM, 0/*IPPROTO_TCP*/)) <= 0)
{
LOGFMTF("errcode[-1], create socket fail!");
return -1;
}
serveraddr.sin_family = AF_INET;
serveraddr.sin_port = htons(9102);
serveraddr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
unsigned long mode = 1; // 1 to enable non-blocking socket
if (ioctlsocket(soc, FIONBIO, &mode) == SOCKET_ERROR) {
LOGFMTF("errcode[-2], ioctlsocket fail.");
return -2;
}
if (::connect(soc, (SOCKADDR *)&serveraddr, sizeof(serveraddr)) != 0)
{
/* FIONBIO socket enters here can go run; non-FIONBIO socket enters here stands for real error;*/
if (WSAGetLastError() != WSAEWOULDBLOCK) {
LOGFMTF("errcode[-3], connect fail.");
//return -3;
}
//return -1;
}
g_client_fd = soc;
LOGFMTT("client_fd[%d]", g_client_fd);
LOGFMTT("connect to server last err[%d].", WSAGetLastError());
return 0;
}
/** send loop; */
DWORD WINAPI send_thread_loop(LPVOID pM) {
LOGFMTT("send thread[%d] start.", GetCurrentThreadId());
for (;!g_to_exit;)
{
QMutexLocker locker(&g_send_queue_lock);
if (g_send_queue.count() == 0) {
Sleep(Send_Thread_Gap);
}else {
LOGFMTT("send one packet.");
int pakcet_size = g_send_queue.begin()->size;
char *addr = g_send_queue.begin()->data;
::send(g_client_fd, addr, pakcet_size, 0);
/* ------------!Attention begin------------ */
LOGFMTT("send last err[%d].", GetLastError());--------> sometimes got 10057 error.
/* ------------!Attention end------------ */
delete[]addr;
g_send_queue.erase(g_send_queue.begin());
}
}
LOGFMTT("send thread[%d] exit.", GetCurrentThreadId());
return 0;
}
int start_net_thread() {
g_recv_thread = CreateThread(NULL, 0, recv_thread_loop, NULL, 0, NULL);
g_send_thread = CreateThread(NULL, 0, send_thread_loop, NULL, 0, NULL);
return 0;
}
int main(){
if(connect_to_server() != 0)
{
QMessageBox msgBox;
msgBox.setText("failed.");
msgBox.exec();
return -1;
}
start_net_thread();
return 0;
}
片狀連接,連接丟失,忽略錯誤代碼。 – CodeCaster
@CodeCaster也許我有很多功課要做。如果我忽略此錯誤並嘗試稍後再發送,那麼可以嗎?我已經改變了我的代碼以改進它,並且會測試更多以查看它是否適用於我的明天工作。 – waterd
@CodeCaster我想我錯過了一些關於我的錯誤的重要背景。連接到服務器,發送線程開始和我的fisrt嘗試發送登錄數據包到服務器是逐行的。到現在爲止,如果第一次發送失敗,不會再發送數據包。所以我在第一個回覆中有這個問題。更多的工作需要等到明天。謝謝您的回覆。 – waterd