I haven't worked on Interop.Allocate calls yet, but I'm trying to learn
I don't know how to create a structure...
I need:
WINDOWPLACEMENT {
   INT length;
   INT flags;
   INT showCmd;
   POINT ptMinPosition;
   POINT ptMaxPosition;
   RECT rcNormalPosition;
}

And I believe POINT is:
POINT {
   INT x
   INT y
}

If someone could give me a tut or something I would be most gratefull

I need this for GetWindowPlacement...

A structure is nothing more than a series of bytes. The trick is to know how much bytes...

For this you need to look at what the structures must contain:

(U)INT means an (unsigned) integer, this is 2 bytes long (also known as a WORD).

(actually these types in the WINDOWPLACEMENT structure are defined as UINTs, which are unsigned integers; there's a difference between INT - signed integers, and UINT - unsigned integers)

a POINT and a RECT are structures on their own, they are as long as the individual types used in the structure:

However a POINT structure is:

POINT {
  LONG x;
  LONG y;
}

Thus they are LONGs, not INTs. Since a LONG is 4 bytes (also known as a double word or DWORD) that makes this substructure 8 bytes in total. A RECT structure is defined as:

RECT {
  LONG left;
  LONG top;
  LONG right;
  LONG bottom;
}

thus that makes the RECT structure 16 bytes long.

If we add all this up we come to 3 INTs, 2 POINTs, 1 REC  or  3 INTs, 8 LONGs  or  38 bytes...

So we need to allocate 38 bytes with the Interop.Allocate function to create this particular datablock (aka structure).

code:

---

Var WINDOWPLACEMENT = Interop.Allocate(38);

---

code:

---

WINDOWPLACEMENT.WriteWORD(0, WINDOWPLACEMENT.Size);  // UINT length
WINDOWPLACEMENT.WriteWORD(2, flags);                 // UINT flags
WINDOWPLACEMENT.WriteWORD(4, showCmd);               // UINT showCmd
WINDOWPLACEMENT.WriteDWORD(6, minx);                 // LONG ptMinPosition_x
WINDOWPLACEMENT.WriteDWORD(10, miny);                // LONG ptMinPosition_y
WINDOWPLACEMENT.WriteDWORD(14, maxx);                // LONG ptMaxPosition_x
WINDOWPLACEMENT.WriteDWORD(18, maxy);                // LONG ptMaxPosition_y
WINDOWPLACEMENT.WriteDWORD(22, left);                // LONG rcNormalPosition_left
WINDOWPLACEMENT.WriteDWORD(26, top);                 // LONG rcNormalPosition_top
WINDOWPLACEMENT.WriteDWORD(30, right);               // LONG rcNormalPosition_right
WINDOWPLACEMENT.WriteDWORD(34, bottom);              // LONG rcNormalPosition_bottom

---

code:

---

var flags = WINDOWPLACEMENT.ReadWORD(2);  // UINT flags

---

code:

---

Interop.Call('user32.dll', 'GetWindowPlacement', hWnd, WINDOWPLACEMENT.DataPtr);

---

code:

---

with (WINDOWPLACEMENT) {
      WriteWORD(0, Size);     // UINT length
      WriteWORD(2, flags);    // UINT flags
      WriteWORD(4, showCmd);  // UINT showCmd
      etc...
}

---

code:

---

Interop.Call('user32.dll', 'GetWindowPlacement', hWnd, WINDOWPLACEMENT);

---

Thank you very much, it became a lot clearer now

http://shoutbox.menthix.net/showthread.php?tid=63...d=702413#pid702413

That post is pretty useful when you're working with DataBlocs

Lol, I was just reading that when I got a new Alert mail, for a new reply
Thanks for the extra info