winsock, asynch and window focus

[michellemybell]

Hi

I wrote a small server using asynchronous sockets for windows (winsock). The problem I have is that when the server window is not in focus / not active (say, I have another window in focus instead) then it does not respond to winsock messages. As soon as I put my mouse pointer over the window, or click it, all of a sudden the message queue is read and it then sends its own messages as it should!

I am wondering why, and if there is a way to fix this? IE so that the program is always responsive even when not in focus?

Thanks

[Chirieac]

You use WSAAsyncSelect for your asynchronous socket? Some of your code should be useful.

[michellemybell]

hi chirieac

I do use WSAAsyncselect. Here is some of my code. The code works fine, aslong as the window is in focus. As soon as I switch to another window, the program stops responding to messages. Then when I reactivate the focus, it resumes as normal.


LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message) /* handle the messages */
{
case WM_CREATE:
//start winsock
WSADATA w;
int error = WSAStartup(0x0202, &w);

if(error)
{
MessageBox(hwnd, "Cannot start winsock.", "Error", MB_OK);
return 1;
}
else
if(w.wVersion != 0x0202)
{
MessageBox(hwnd, "Wrong winsock version.", "Error", MB_OK);
WSACleanup();
return 1;
}

//create listening socket
ls = socket(AF_INET, SOCK_STREAM, 0);

//bind socket
sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(5001);
addr.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(ls, (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR)
{
MessageBox(hwnd, "Could not bind socket.", "Error", MB_OK);
WSACleanup();
return 1;
}
if(listen(ls,5) == SOCKET_ERROR)
{
MessageBox(hwnd, "Socket could not listen.", "Error", MB_OK);
WSACleanup();
return 1;
}
//bind socket to SOCKET_MESSAGE
WSAAsyncSelect (ls, hwnd, SOCKET_MESSAGE, FD_READ | FD_WRITE | FD_ACCEPT | FD_CLOSE);
break;

case SOCKET_MESSAGE:
{
if (WSAGETSELECTERROR(lParam))
{
closesocket (ls);
WSACleanup();
MessageBox(hwnd, "Socket message error.", "Error", MB_OK);
return 1;
}

switch (WSAGETSELECTEVENT(lParam))
{
case FD_READ:
{
//find sender
Player *p = findSender();

if(p == NULL)
{
MessageBox(hwnd, "Can't find socket.", "Error", MB_OK);
break;
}

char rbuff[MAX_MESSAGE_SIZE];

unsigned int bytes = recv(wParam, rbuff, sizeof(rbuff), 0);

for(unsigned int i = 0; i < bytes; i++)
p->addToBuffer(rbuff[i]);

break;
}

case FD_ACCEPT:
SOCKET c = accept(wParam, NULL, NULL);
Player *p = new Player(0, 0, 0, 0, 0, "", c);
players.push_back(p);
waiting_for++;
break;

case FD_CLOSE:
shutdown(wParam, SD_BOTH);
closesocket(wParam);
break;
}
break;

[Chirieac]

Sorry, but I don't see a problem to you code. The window should receive the socket events even if the window don't have the focus. Maybe the problem is in another place...

[michellemybell]

Sorry, but I don't see a problem to you code. The window should receive the socket events even if the window don't have the focus. Maybe the problem is in another place...

Hmmm, I guess maybe you are right.. although it will hard to prove this. But I will try. Atleast now I know that this is not the correct behaviour for asynchronous sockets.
Thanks :)