Trouble with dialog boxes in win32

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C++

Win32

hi, i'm in need of some assistance getting some dialog boxes to bloody work properly. I've never done dialog boxes before, and i now know why i avoided them :\ . When my main window is first created, I want a dialog box to pop asking for some information from the user. Then, when they press the "Connect" button on the dialog box, i wish for it to close, and for my program to go about it's business. So i have this in my WM_CREATE: of my main windowproc:

int ret = DialogBox(GetModuleHandle(NULL), MAKEINTRESOURCE(IDD_DIALOG1), hwnd, DlgProc);

which works fine, the dialog opens when i start the program, and lets the person fill in the two fields, an ip control for a server ip, and an edit control for a screenname. This is the dialogwindowproc, which i'm sure is where everything goes fubar:

BOOL CALLBACK DlgProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam)
{
    switch(Message)
    {
        case WM_INITDIALOG:
        {
	      return TRUE;
	}
	case WM_COMMAND:
	{
            switch(LOWORD(wParam))
            {
                case IDC_BUTTON1:
		{
		     DWORD ipAddress = 0;
		     char * TempIp;
		     struct in_addr addr;

		     SendDlgItemMessage(hwnd, IDC_IPADDRESS1, IPM_GETADDRESS, 0, (lParam) &ipAddress);
		     addr.s_addr = (long)ipAddress;
		     TempIp = inet_ntoa(addr);
		     strcpy_s(ServerIp, TempIp);
					
		     GetDlgItemText(hwnd, IDC_EDIT1, username, 100);

		     SendMessage(mainWindow, WM_START_WINSOCK, 0, 0);
                     EndDialog(hwnd, IDOK);
		     return true;
		}
            }
	    break;
	}
        default:
            return FALSE;
    }
    return TRUE;
}

So what i thought i was doing was, when the button with the dialog ID IDC_BUTTON1 was pressed, it would first grab the ip address in the form of DWORD via the IPM_GETADDRESS message, which i then convert to a char string and then store in a global variable 'ServerIp'. I then grab the entered username via the GetDlgItemText function and store it in the global TCHAR string, 'username'. I then send a user-defined message, which is handled by my main WinProc, but i'm not worried about that cause it doesn't get any farther. I thought the end dialog function was supposed to close the dialog box entirely, but it just stays open, and the rest of my main window pops up behind it, which i can't click on because the dialog box is still up. Then, when i try and click the Connect button again to close it, i get an "Unhandeled exception" / "Access Violation" error from MSVC++ express and my program crashes. so yeh, I'm doing this wrong. Can someone help me out?