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GDI draws lines using the current pen selected in the device context.
gdi用当前选进关联设备的画笔绘制直线。
Later on, you deselect the pen object from the device context and destroy the object.
稍后,你从关联设备取消画笔对象并销毁该对象。
All attributes of the device context have default values that are set when the device context is obtained.
关联设备的所有属性有缺省值,当关联设备被获得时它们被设置。
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