Dll Callback/Context

// Callback used to notify client of soft button change typedef DWORD (WINAPI *lgLcdOnSoftButtonsCB)(IN int device,
																				IN DWORD dwButtons,
																				IN const PVOID pContext);
typedef struct
{
	// Set to NULL if no softbutton notifications are needed
	lgLcdOnSoftButtonsCB softbuttonsChangedCallback;
	PVOID softbuttonsChangedContext; 
} lgLcdSoftbuttonsChangedContext;
[i][b]Members[/b][i]
[b]softButtonsChangedCallback[/b]
Specifies a pointer to a function that should be called when the state of the soft buttons changes. If no notification is needed, leave this parameter NULL.
[b]softbuttonsChangedContext[/b]
Specifies an arbitrary context value of the application that is passed back to the client in the event that soft buttons are being pressed or released. The new value of the soft buttons is reported in the dwButtons parameter of the callback function.[/spoiler]


So, in einem C++ Script sieht das so aus:
[spoiler][code]Structure lgLcdSoftbuttonsChangedContext
   ;softbuttonsChangedCallback.lgLcdOnSoftButtonsCB
   *softbuttonsChangedCallback
   *softbuttonsChangedContext
EndStructure
//[...]
Procedure.l MY_lgLcdOnSoftButtonsCB(device.l, dwButtons.l, *pContext)

   If MyG15\WindowID
      If dwButtons & #LGLCDBUTTON_BUTTON0
         SetGadgetText(MyG15\Buttons[0], "< 1 >")
      Else
         SetGadgetText(MyG15\Buttons[0], "1")
      EndIf

      If dwButtons & #LGLCDBUTTON_BUTTON1
         SetGadgetText(MyG15\Buttons[1], "< 2 >")
      Else
         SetGadgetText(MyG15\Buttons[1], "2")
      EndIf

      If dwButtons & #LGLCDBUTTON_BUTTON2
         SetGadgetText(MyG15\Buttons[2], "< 3 >")
      Else
         SetGadgetText(MyG15\Buttons[2], "3")
      EndIf

      If dwButtons & #LGLCDBUTTON_BUTTON3
         SetGadgetText(MyG15\Buttons[3], "< 4 >")
      Else
         SetGadgetText(MyG15\Buttons[3], "4")
      EndIf

   EndIf

   If MyG15\CB
      MyG15\CB(device.l, dwButtons.l, *pContext)
   EndIf
EndProcedure