C / C++ / MFC

...
void outportb(unsigned int portid, unsigned char value)
{ 
    __asm  
    {    
        mov edx, portid  // port id stored in dx    
        mov al, value    // 8-bit output value stored in al    
        out dx, al       // write the value to the port  
    }
}
...
outportb(0x378, 20); // write the value 20 to the lpt-port (0x378)
...

CBrush brush;
brush.CreateSolidBrush(...);

CBrush *pOldBrush = dc.SelectObject(&brush);
...
dc.SelectObject(pOldBrush);
// now dc and brush can go out of scope, without leaking GDI resources

//Create the GUID:
GUID l_GUID;
::CoCreateGuid(&l_GUID);

//Get in string format:
OLECHAR szGUID[40];
::StringFromGUID2(l_GUID, szGUID, 39);
CString sGUID = szGUID;