vtkWin32OpenGLRenderWindow: use size_t for integer storage of pointers

Also explicitly reinterpret_cast them.

Change-Id: I5ec4ae799e205e743c868cecffcf9ee400ded60f

Rendering/OpenGL/vtkWin32OpenGLRenderWindow.cxx

@@ -21,6 +21,7 @@
 #include "vtkOpenGLRenderWindow.h"
 #include "vtkOpenGLError.h"
 #include "vtkRendererCollection.h"
+#include "vtkTypeTraits.h"
 #include "vtkWin32RenderWindowInteractor.h"
 
 #include <math.h>
@@ -1348,19 +1349,19 @@ void vtkWin32OpenGLRenderWindow::SetWindowId(HWND arg)
 // Set this RenderWindow's X window id to a pre-existing window.
 void vtkWin32OpenGLRenderWindow::SetWindowInfo(char *info)
 {
-  int tmp;
-  sscanf(info, "%i", &tmp);
+  size_t tmp;
+  sscanf(info, vtkTypeTraits<size_t>::ParseFormat(), &tmp);
 
-  this->WindowId = (HWND)tmp;
+  this->WindowId = reinterpret_cast<HWND>(tmp);
   vtkDebugMacro(<< "Setting WindowId to " << this->WindowId << "\n");
 }
 
 void vtkWin32OpenGLRenderWindow::SetNextWindowInfo(char *info)
 {
-  int tmp;
-  sscanf(info, "%i", &tmp);
+  size_t tmp;
+  sscanf(info, vtkTypeTraits<size_t>::ParseFormat(), &tmp);
 
-  this->SetNextWindowId((HWND)tmp);
+  this->SetNextWindowId(reinterpret_cast<HWND>(tmp));
 }
 
 void vtkWin32OpenGLRenderWindow::SetDisplayId(void * arg)
@@ -1382,10 +1383,10 @@ void vtkWin32OpenGLRenderWindow::SetDeviceContext(HDC arg)
 // Sets the HWND id of the window that WILL BE created.
 void vtkWin32OpenGLRenderWindow::SetParentInfo(char *info)
 {
-  int tmp;
-  sscanf(info, "%i", &tmp);
+  size_t tmp;
+  sscanf(info, vtkTypeTraits<size_t>::ParseFormat(), &tmp);
 
-  this->ParentId = (HWND)tmp;
+  this->ParentId = reinterpret_cast<HWND>(tmp);
   vtkDebugMacro(<< "Setting ParentId to " << this->ParentId << "\n");
 }