release_hdc()

void xtd::drawing::graphics::release_hdc

(

intptr

hdc

)

Releases a device context handle obtained by a previous call to the xtd::drawing::graphics::get_hdc() method of this xtd::drawing::graphics.

Parameters

hdc	Handle to a device context obtained by a previous call to the xtd::drawing::graphics::get_hdc() method of this xtd::drawing::graphics.

Remarks

The device context is a Windows structure based on GDI that defines a set of graphical objects and their associated attributes, as well as the graphical modes that affect output. This method returns that device context with the exception of a font. Because a font is not selected, calls to the xtd::drawing::graphics::from_hdc method using a handle returned from the xtd::drawing::graphics::get_hdc method will fail.

Calls to the xtd::drawing::graphics::get_hdc and xtd::drawing::graphics::release_hdc methods must appear in pairs. During the scope of a xtd::drawing::graphics::get_hdc and xtd::drawing::graphics::release_hdc method pair, you usually make only calls to GDI functions. Calls in that scope made to GDI+ methods of the xtd::drawing::graphics that produced the hdc parameter fail with an ObjectBusy error. Also, GDI+ ignores any state changes made to the xtd::drawing::graphics of the hdc parameter in subsequent operations.