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Gets the currently selected device type.
#include "ltwrappr.h"
virtual L_INT LWia::GetSelectedDeviceType(puDeviceType)
The type of the device that is currently connected. Possible values are:
| Value | Meaning |
|---|---|
| WiaDeviceTypeScanner | The device is a scanner. |
| WiaDeviceTypeDigitalCamera | The device is a camera. Cameras are not supported by Windows Vista and later. |
| WiaDeviceTypeStreamingVideo | The device contains streaming video. Streaming video is not supported by Windows Server 2003, Windows Vista, or later. |
| Value | Meaning |
|---|---|
| SUCCESS | The function was successful. |
| < 1 | An error occurred. Refer to Return Codes. |
This feature is available in LEADTOOLS version 16 or higher.
Call [LWia:GetSelectedDeviceType to determine which device type is currently selected.
WIA does not have a default device selection. In order for [LWia:GetSelectedDeviceType to succeed, be sure to call either LWia::SelectDeviceDlg or LWia::SelectDevice before calling [LWia:GetSelectedDeviceType.
When using LWia::AcquireSimple for automatic acquisition, it is not necessary to call either of the two functions mentioned above before calling [LWia:GetSelectedDeviceType. LWia::AcquireSimple calls LWia::SelectDeviceDlg internally, ensuring a device is currently selected.
For an example, refer to LWia::EnumDevices.