Programming with LEADTOOLS Barcode

LEADTOOLS supports the reading and writing of several major types of barcodes using the AxtelÓ engine. These types are:

Linear barcodes (1D)

PDF417 (2D)

Data Matrix (2D)

QR

For each major type of barcode, one or more subtypes are supported for both reading and writing. These subtypes are:

Linear Barcodes

EAN 13

EAN 8

UPC A

Code 3 of 9

Code 128

Interleaved 2 of 5

CODABAR

UCCEAN 128

PDF Barcodes

PDF417

Data Matrix

BARCODE_DM_DEF

BARCODE_DM_10x10

BARCODE_DM_12x12

BARCODE_DM_14x14

BARCODE_DM_16x16

BARCODE_DM_18x18

BARCODE_DM_20x20

BARCODE_DM_22x22

BARCODE_DM_24x24

BARCODE_DM_26x26

BARCODE_DM_32x32

BARCODE_DM_36x36

BARCODE_DM_40x40

BARCODE_DM_44x44

BARCODE_DM_48x48

BARCODE_DM_52x52

BARCODE_DM_64x64

BARCODE_DM_72x72

BARCODE_DM_80x80

BARCODE_DM_88x88

BARCODE_DM_96x96

BARCODE_DM_104x104

BARCODE_DM_120x120

BARCODE_DM_132x132

BARCODE_DM_144x144

BARCODE_DM_8x18

BARCODE_DM_8x32

BARCODE_DM_12x26

BARCODE_DM_12x36

BARCODE_DM_16x36

BARCODE_DM_16x48

BARCODE_DM_WRITE_RECTANGLE

QR

BARCODE_QR_DEF

BARCODE_QR_M2_1

BARCODE_QR_M2_2

BARCODE_QR_M2_3

BARCODE_QR_M2_4

BARCODE_QR_M2_5

BARCODE_QR_M2_6

BARCODE_QR_M2_7

BARCODE_QR_M2_8

BARCODE_QR_M2_9

BARCODE_QR_M2_10

BARCODE_QR_M2_11

BARCODE_QR_M2_12

BARCODE_QR_M2_13

BARCODE_QR_M2_14

BARCODE_QR_M2_15

BARCODE_QR_M2_16

BARCODE_QR_M2_17

BARCODE_QR_M2_18

BARCODE_QR_M2_19

BARCODE_QR_M2_20

BARCODE_QR_M2_21

BARCODE_QR_M2_22

BARCODE_QR_M2_23

BARCODE_QR_M2_24

BARCODE_QR_M2_25

BARCODE_QR_M2_26

BARCODE_QR_M2_27

BARCODE_QR_M2_28

BARCODE_QR_M2_29

BARCODE_QR_M2_30

BARCODE_QR_M2_31

BARCODE_QR_M2_32

BARCODE_QR_M2_33

BARCODE_QR_M2_34

BARCODE_QR_M2_35

BARCODE_QR_M2_36

BARCODE_QR_M2_37

BARCODE_QR_M2_38

BARCODE_QR_M2_39

BARCODE_QR_M2_40

BARCODE_QR_M1_1

BARCODE_QR_M1_2

BARCODE_QR_M1_3

BARCODE_QR_M1_4

BARCODE_QR_M1_5

BARCODE_QR_M1_6

BARCODE_QR_M1_7

BARCODE_QR_M1_8

BARCODE_QR_M1_9

BARCODE_QR_M1_10

BARCODE_QR_M1_11

BARCODE_QR_M1_12

BARCODE_QR_M1_13

BARCODE_QR_M1_14

BARCODE_QR_M1_DEF

LEADTOOLS supports the reading and writing of the above barcode types for all bitmaps currently supported by LEADTOOLS. For a full list of supported file formats, refer to Summary of All Supported Image File Formats.

Before using any of the functions for reading or writing barcodes, or finding duplicate barcodes, the Barcode DLLs must be loaded and the engine initialized by calling L_BarCodeInit. The barcode functions described below can then be used. Before terminating the application however, L_BarCodeExit must be called to close the engine and free the DLLs.

LEADTOOLS provides one function for recognizing barcodes in the bitmap, and another function for writing the barcode to the bitmap.

You can use the L_BarCodeRead function, to search for barcodes in the bitmap. This function can recognize one or more barcodes in the bitmap with suitable function parameters. To write linear, Data matrix or PDF  barcode symbols, use the L_BarCodeWriteExt function. To write these barcode symbols and QR barcode symbols, use L_BarCodeWriteExt2. Use the L_BarCodeVersionInfo function to get the Barcode product information.

You can read/write barcodes by specifying a color for bars and space. Also, you can write transparent barcode, but the transparent feature is not recommended.

In addition to the Barcode functions given above, there are a number of functions for getting duplicated barcodes. These are as follows: L_BarCodeIsDuplicated, L_BarCodeGetDuplicated, L_BarCodeGetFirstDuplicated and L_BarCodeGetNextDuplicated.

If you want to change the duplicated barcode, you must change the nSizeofBarCodeData, and pszBarCodeData members of BARCODEDATA structure.

To retrieve information about a barcode, use the L_BarCodeVersionInfo.

When the array of structures allocated by L_BarCodeRead is no longer needed, the memory should be freed using L_BarCodeFree.