code: def requestScreenshot(self, type_, pchPreviewFilename, pchVRFilename):
          
  
          fn = self.function_table.requestScreenshot
          pOutScreenshotHandle = ScreenshotHandle_t()
          result = fn(byref(pOutScreenshotHandle), type_, pchPreviewFilename, pchVRFilename)
          return result, pOutScreenshotHandle
docs: Request a screenshot of the requested type.
           A request of the VRScreenshotType_Stereo type will always
           work. Other types will depend on the underlying application
           support.
           The first file name is for the preview image and should be a
           regular screenshot (ideally from the left eye). The second
           is the VR screenshot in the correct format. They should be
           in the same aspect ratio.  Formats per type:
           VRScreenshotType_Mono: the VR filename is ignored (can be
           nullptr), this is a normal flat single shot.
           VRScreenshotType_Stereo:  The VR image should be a
           side-by-side with the left eye image on the left.
           VRScreenshotType_Cubemap: The VR image should be six square
           images composited horizontally.
           VRScreenshotType_StereoPanorama: above/below with left eye
           panorama being the above image.  Image is typically square
           with the panorama being 2x horizontal.
           
           Note that the VR dashboard will call this function when
           the user presses the screenshot binding (currently System
           Button + Trigger).  If Steam is running, the destination
           file names will be in %TEMP% and will be copied into
           Steam's screenshot library for the running application
           once SubmitScreenshot() is called.
           If Steam is not running, the paths will be in the user's
           documents folder under Documents\SteamVR\Screenshots.
           Other VR applications can call this to initiate a
           screenshot outside of user control.
           The destination file names do not need an extension,
           will be replaced with the correct one for the format
           which is currently .png.