Retrieving Device Data

Windows supports two functions, GetDeviceCaps and DeviceCapabilities, that applications can use to retrieve device data using a device context. GetDeviceCaps retrieves general device data for the following devices:

• Raster displays

• Dot-matrix printers

• Ink-jet printers

• Laser printers

• Vector plotters

• Raster cameras

The data includes the supported capabilities of the device, including device resolution (for video displays), color format (for video displays and color printers), number of graphic objects, raster capabilities, curve drawing, line drawing, polygon drawing, and text drawing. An application retrieves this data by supplying a handle identifying the appropriate device context as well as an index specifying the type of data the function is to retrieve.

The DeviceCapabilities function retrieves data specific to printers, including the number of available paper bins, the duplex capabilities of the printer, the resolutions supported by the printer, the maximum and minimum supported paper size, and so on. An application retrieves this data by supplying strings specifying a printer device and port, as well as an index specifying the type of data that the function is to retrieve.

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