C # net calls API enumeration system monitor, display

Using system;
Using system. runtime. interopservices;
Namespace opticaltouch
{
Public Delegate bool monitorenumproc (intptr hmonitor, intptr hdcmonitor, intptr lprcmonitor, intptr dwdata );
[Structlayout (layoutkind. Sequential, size = 8)]
Public struct rect
{
Public int left;
Public int top;
Public int right;
Public int bottom;
}
[Structlayout (layoutkind. Sequential, size = 8)]
Public struct monitorinfos
{
[Financialas (unmanagedtype. byvalarray, sizeconst = 256)]
Public rect [] rects;
Public int count;
}
Public class monitorhelper
{
Private monitorenumproc;
Public monitorhelper ()
{
Monitorenumproc = monitorenumproc;
}
Public monitorinfos enummonitors ()
{
Monitorinfos MIS = new monitorinfos ();
Mis. rects = new rect [256];
Mis. Count = 0;
Intptr dwdata = marshal. allochglobal (marshal. sizeof (typeof (monitorinfos )));
Marshal. structuretoptr (MIS, dwdata, true );
Enumdisplaymonitors (intptr. Zero, intptr. Zero, monitorenumproc, dwdata );
MIS = (monitorinfos) Marshal. ptrtostructure (dwdata, typeof (monitorinfos ));
Marshal. freehglobal (dwdata );
Return MIS;
}
Private bool monitorenumproc (intptr hmonitor, intptr hdcmonitor, intptr lprcmonitor, intptr dwdata)
{
Rect = (rect) Marshal. ptrtostructure (lprcmonitor, typeof (rect ));
Monitorinfos MIS = (monitorinfos) Marshal. ptrtostructure (dwdata, typeof (monitorinfos ));
Mis. rects [mis. Count]. Left = rect. Left;
Mis. rects [mis. Count]. Top = rect. Top;
Mis. rects [mis. Count]. Right = rect. Right;
Mis. rects [mis. Count]. Bottom = rect. bottom;
Mis. Count ++;
Marshal. structuretoptr (MIS, dwdata, true );
Return true;
}
[Dllimport ("user32.dll")]
Private Static extern bool enumdisplaymonitors (intptr HDC, intptr pprcclip, monitorenumproc, intptr dwdata );
}
}
I haven't written much. Read msdn and check the code.

 

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