Operator Reference

dev_get_windowT_dev_get_windowDevGetWindowDevGetWindowdev_get_window (Operator)

dev_get_windowT_dev_get_windowDevGetWindowDevGetWindowdev_get_window — Return the handle of the active graphics window.

Signature

dev_get_window( : : : WindowHandle)

Description

dev_get_windowdev_get_windowDevGetWindowDevGetWindowdev_get_window returns the window handle of the active graphics window. If currently no graphics window is open, the return value is -1.

Attention

Using the code export feature of HDevelop, the code that is generated for this operator may have a different behavior than the related HALCON operator. For a detailed description of the code export of HDevelop graphics operators into the different programming languages see in the “HDevelop User's Guide” the chapter Code Export -> General Aspects of Code Generation -> Graphics Windows.

Parameters

WindowHandleWindowHandleWindowHandlewindowHandlewindow_handle (output_control) window → (handle)

Window handle.

Example (HDevelop)

read_image (Image,'mreut')
threshold (Image, Region, 100, 200)
dev_open_window (1, 1, 200, 200, 'black', WindowID1)
dev_open_window (1, 220, 200, 200, 'black', WindowID2)
dev_get_window (CurrentWindowID)
dev_set_window (WindowID1)
dev_set_color ('blue')
dev_display (Image)
dev_display (Region)
dev_set_window(CurrentWindowID)

Result

If the values of the specified parameters are correct, dev_get_windowdev_get_windowDevGetWindowDevGetWindowdev_get_window returns 2 ( H_MSG_TRUE) . Otherwise, an exception is raised and an error code returned.

Possible Predecessors

dev_close_windowdev_close_windowDevCloseWindowDevCloseWindowdev_close_window

Possible Successors

dev_set_windowdev_set_windowDevSetWindowDevSetWindowdev_set_window

Module

Foundation

Operators