//  in CDlg.h

Class CDlg : CDialog {
public:
   static DWORD SockThread(LPVOID);

//  in CDlg.cpp

DWORD CDlg::SockThread(LPVOID) {
       CDlg::GetDlgItem(IDC_ACCEPT);
//OR         GetDlgItem(IDC_ACCEPT);

the IDC_ACCEPT is a button, and following compile error occurred
CDlg.cpp(139) : error C2352: 'CWnd::GetDlgItem' : illegal call of non-static
member function

Hi!
You cannot call non-static function GetDlgItem() from static SockThread()
( no "this" so it know nothing
about current CDlg )
What you need to do is to put CDlg * as parameter to SockThread and and call
there GetDlgItem
In Create thread "this" have to be set as a parameter to thead
and thread function  :
DWORD CDlg::SockThread(LPVOID p) {
       static_cast<CDlg *>(p)->GetDlgItem(IDC_ACCEPT);
    return XX ; // you forgot return code here and my usual error in class
definition of CDlg you forgot ";" after }

HTH
Arkady