> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abbyy.com/llms.txt
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# BarcodeOrientationEnum

BarcodeOrientationEnum enumeration constants are used to denote the types of barcode orientation that can be detected by ABBYY FineReader Engine. It is used by the [BarcodeParams](/fine-reader/engine/api-reference/parameter-objects/preprocessing-analysis-recognition-and-synthesis-parameters/barcodeparams) object.

```
typedef enum {
 BO_Unknown       = 0x00000000,
 BO_Left_To_Right = 0x00000001,
 BO_Down_To_Top   = 0x00000002,
 BO_Right_To_Left = 0x00000004,
 BO_Top_To_Down   = 0x00000008,
 BO_Autodetect    = BO_Left_To_Right | BO_Down_To_Top | BO_Right_To_Left | BO_Top_To_Down
} BarcodeOrientationEnum;
```

## Elements

| Name                      | Description                                                                                                                                          |
| ------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- |
| BO\\\_Autodetect          | Detect the barcode orientation automatically.                                                                                                        |
| BO\\\_Down\\\_To\\\_Top   | Barcode is oriented from down to top.                                                                                                                |
| BO\\\_Left\\\_To\\\_Right | Barcode is oriented from left to right.                                                                                                              |
| BO\\\_Right\\\_To\\\_Left | Barcode is oriented from right to left.                                                                                                              |
| BO\\\_Top\\\_To\\\_Down   | Barcode is oriented from top to down.                                                                                                                |
| BO\\\_Unknown             | Denotes unknown type of barcode orientation. It may be used as the return value if ABBYY FineReader Engine has failed to detect barcode orientation. |

## Used in

[IBarcodeParams::Orientation](/fine-reader/engine/api-reference/parameter-objects/preprocessing-analysis-recognition-and-synthesis-parameters/barcodeparams#orientation)