C / C++ / MFC

sawerr wrote:

If one application grabs a port no other application can use it.

sawerr wrote:

So, for example,that means one computer mustn't have 2 or more web server that listening port 80. Right?

sawerr wrote:

But also a lot of clients can connect same port.

SOCKET sConnection = socket(AF_UNSPEC, SOCK_STREAM, IPPROTO_TCP); //Create a TCP stream socket with any address type (IPv4, IPv6, ...)
//pAddress = get listening address, usually 0.0.0.0
bind(sConnection, pAddress->ai_addr, pAddress->ai_addrlen);
listen(sConnection, SOMAXCONN);
for (;;) {
    SOCKADDR saClient;
    DWORD nClientAddrLen = sizeof(saClient);
    SOCKET sClient = accept(sConnection, &saClient, &nClientAddrLen);
    CreateThread(); //Create a new thread to handle the new connection
    //Now wait for the next connection in the new loop
}

LRESULT CALLBACK DlgProc(HWND hwnd, UINT Msg, WPARAM wParam, LPARAM lParam) {
    switch (Msg) {
        case WM_INITDIALOG:
            break; //You can do whatever here

        case WM_COMMAND:
            switch (LOWORD(wParam)) {
                case IDC_MYBUTTON:
                    return 0; //something happened to MYBUTTON
            }
            break; //We havn't handled it, use default handler

        case WM_CLOSE:
            //cleanup
            return 0;
    }
    return pOriginalProcedure(hwnd, Msg, wParam, lParam); //This is set as GetWindowLong(GWL_MSGPROC) before changing the procedure.
}

case WM_PAINT: // custom control window paint handler
{
// some checks for need of repainting
Gdiplus::Graphics graphics(hdc);
Gdiplus::Bitmap *bmp = new Gdiplus::Bitmap(CtrlRect.right, CtrlRect.bottom);
Gdiplus::Graphics *temp = Gdiplus::Graphics::FromImage(bmp);
temp->SetSmoothingMode(Gdiplus::SmoothingMode::SmoothingModeAntiAlias);
// .. drawing goes here
// .. paint "ball" with new mouse coords
Gdiplus::CachedBitmap *cbmp = new Gdiplus::CachedBitmap(bmp, &graphics);
delete bmp;
delete temp;
graphics.DrawCachedBitmap(cbmp, 0, 0);
// done
}

*(BOOL*)&m_bool = FALSE;

class CBaseClass
{
 public:
  CBaseClass(){}
  virtual ~CBaseClass(){}

//members...
};

class CClass : public CBaseClass
{
 public:
  CClass(){}
  virtual ~CClass(){}

//members...
};