_GlobalToLocal( ) API Library Routine

Article
11/14/2006

Translates a point in screen-relative coordinates to window-relative coordinates.

void _GlobalToLocal(Point FAR *pt, WHANDLE wh)
Point FAR *pt;               /* Point. */
WHANDLE wh;            /* Window handle. */

Remarks

Before calling _GlobalToLocal( ), call _FindWindow( ) to determine which window owns the point.

For more information on how to create an API library and integrate it with Visual FoxPro, see Accessing the Visual FoxPro API.

Example

The following example waits for a left mouse button click and then uses _FindWindow( ) to get the window handle for the mouse position. _GlobalToLocal( ) takes both the window handle and the absolute mouse position as parameters, and returns the mouse position to a position relative to the window.

Visual FoxPro Code

SET LIBRARY TO GLTOLOC

C Code

#include <pro_ext.h>

void putLong(long n, int width)
{
   Value val;

   val.ev_type = 'I';
   val.ev_long = n;
   val.ev_width = width;

   _PutValue(&val);
}

FAR FindWindowEx(ParamBlk FAR *parm)
{
   WHANDLE wh;
   Point mousePos;
   int where;

   // Get mouse position when left button goes down
   _Execute("WAIT WINDOW 'Click In A Window' NOWAIT");
   while (_InKey(0, MOUSEACTIVE | HIDECURSOR) != 151);
   while (!_MousePos(&mousePos));

   switch (where = _FindWindow(&wh, mousePos))
   {
      case inBorder:
         _PutStr("\nMouse down inBorder"); break;
      case inHelp:
         _PutStr("\nMouse down inHelp"); break;
      case inContent:
         _PutStr("\nMouse down inContent"); break;
      case inDrag:
         _PutStr("\nMouse down inDrag"); break;
      case inGrow:
         _PutStr("\nMouse down inGrow"); break;
      case inGoAway:
         _PutStr("\nMouse down inGoAway"); break;
      case inZoom:
         _PutStr("\nMouse down inZoom"); break;
      case inVUpArrow:
         _PutStr("\nMouse down inVUpArrow"); break;
      case inVDownArrow:
         _PutStr("\nMouse down inVDownArrow"); break;
      case inVPageUp:
         _PutStr("\nMouse down inVPageUp"); break;
      case inVPageDown:
         _PutStr("\nMouse down inVPageDown"); break;
      case inVThumb:
         _PutStr("\nMouse down inVThumb"); break;
      case inHUpArrow:
         _PutStr("\nMouse down inHUpArrow"); break;
      case inHDownArrow:
         _PutStr("\nMouse down inHDownArrow"); break;
      case inHPageUp:
         _PutStr("\nMouse down inHPageUp"); break;
      case inHPageDown:
         _PutStr("\nMouse down inHPageDown"); break;
      case inHThumb:
         _PutStr("\nMouse down inHThumb"); break;
      case inMenuBar:
         _PutStr("\nMouse down inMenuBar"); break;
      default:
         _PutStr("\nMouse down someplace else"); break;
   }
   _GlobalToLocal(&mousePos, wh);
   _PutStr("\nPosition relative to window:");
   putLong(mousePos.v, 5);
   _PutChr(' ');
   putLong(mousePos.h, 5);
}

FoxInfo myFoxInfo[] = {
   {"ONLOAD", (FPFI) FindWindowEx, CALLONLOAD, ""},
};
FoxTable _FoxTable = {
   (FoxTable FAR *) 0, sizeof(myFoxInfo)/sizeof(FoxInfo), myFoxInfo
};

_GlobalToLocal( ) API Library Routine

Remarks

Example

See Also

Additional resources