DLLand dylib library interface.
.h and .lib files.
Sample source code written in C.

Sample-Code:   Simple polling example

This very simple program lists the X and Y positions of gaze calculated by ViewPoint.  

#include “vpx.h”
   main()
   {
       for( int ix=0; ix<999 ; ix++ ) {
          VPX_RealPoint gp; // a structure with two floats for (x,y) values
          VPX_GetGazePoint( &gp ); // pass by reference
          println(“ViewPoint gaze point: %g, %g “, gp.x, gp.y );
          }
   }

Sample Code:   Event-Driven Real-Time example

Your application must first register with the VPX_InterApp.dll by doing the following for each window procedure (WinProc) that desires notification:    

       
    uniqueMessageId = RegisterWindowMessage( VPX_MESSAGE );
    VPX_InsertMessageRequest( hWnd, uniqueMessageId );
           

After registering, the WinProc should listen for notifications:   

   LRESULT CALLBACK WndProc ( HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam )
   {
       WORD notificationCode = HIWORD(wParam) ;
       if ( message == uniqueMessageId )
           switch ( notificationCode )
           {
                   case VPX_DAT_FRESH :
                   {
                        VPX_EyeType eye = LOWORD ( wParam );
                        showFreshData( eye, graphicsWindow );
                   } break;

Sample Code for SDK / API

• ANSI C VPX_SimpleC_Demo, simple sleep function
• Win32 (C) VPX_Win32_Demo, event handling
• MFC (C,C++) VPX_MFC_Demo, event handling
• BASIC VPX_Basic_Demo, simple timer function
  

The sample code shows how to: Open/close the ViewPoint application, Open/Close/Pause/Resume data files, insert real-time dataMarkers and real-time stringData, access all data in real-time, complete eye tracker control, merge data in real-time from various sources.