J4L Barcoding components for C++

• Linear Barcodes
  • Introduction
  • Test application
  • C++ source code
• Datamatrix
  • Formats
  • Encoding
  • Control Characters
  • Test application
  • DLL
  • C++ source code
• PDF417
• Formats
• Encoding
• Test application
• DLL
• C++ source code
• QRCode
• Formats
• Encoding
• Test application
• DLL
• C++ source code
• Aztec
  • Formats
  • Encoding
  • Test application
  • DLL
  • C++ source code
    

The J4L barcoding components for C++ family currently support the following symbologies:

• Linear barcodes
• Datamatrix
• PDF417 (regular and Macro)
• QRCode
• Aztec code

The components can be used as DLL or compiled inside your own applications since the source code is provided. The components will compile on Windows and Linux using the GNU C++ compiler.

The components can produce two kind of outputs:

• a bitmap image file (BMP)
• or a bitmap as an array of integers which contains the RGB values of the image

Linear barcodes

Introduction

The J4L Barcode 1D C++ class includes the following 1D symbologies:

• Code 128
• Code 39 (regular and extended)
• Code 11
• Codabar
• Code 93 (regular and extended)
• EAN 128
• EAN 13
• EAN 8
• UPC E and UPC A
• Interleaved 2 of 5
• Industrial 2 of 5
• Postnet
• MSI
• Matrix 2 of 5

Test application

The product includes a small demo application which creates windows EMF files. The program is called 1dConsole.exe and supports the following options

• -file: output bmp file
• -code: value to encode
• -height: bar height
• -code128Set: A, B or C
• -type: barcode type (0-code39, 1-code39 extended, 2-Interleaved25, 3-code11, 4 codebar, 5 MSI, 6 UPCA, 7-Industrial 2of5, 8-Matrix 2of5, 9-code93, 10-EAN13, 11-EAN8, 12-UPCE, 13-Code128, 14-Code93 extended, 15-Postnet, 16-EAN128)

example:

1DConsole.exe -code 123456 -type 13 -height 40 -file barcode.emf

will encode the value 123456 using the code128 symbology.

C++ source code

If you want to compile the source code together with your C++ application you can use the following code for creating a windows emf  file:

J4LBarcode1D* m= new J4LBarcode1D();
m->code="123456";
m->barType=13; // code 128
m->processTilde=true;
m->checkCharacter=true;
m->paint();

Metafile* bmp= new Metafile();
string filename="output.emf";
const char* s=m->codeText.c_str();
bmp->write1DWithText(filename.c_str(),m->getWidthsArray(),m->getHeightsArray(),m->getArrayLength(),s,20,m->codeText.length());

delete bmp;

delete m;

Datamatrix

Data Matrix is a two-dimensional (2D) matrix symbology which is made up of square modules arranged within a perimeter finder pattern. It can encode up to 3116 characters from the entire 256 byte ASCII character set. The symbol consists of data regions which contain square modules set out in a regular array. Large ECC 200 symbols contain several regions. Each data region is delimited by a finder pattern, and this is surrounded on all four sides by a quiet zone border (margin).

ECC 200 symbols have an even number of rows and an even number of columns. Most of the symbols are square with sizes from 10 x 10 to 144 x 144. Some symbols however are rectangular with sizes from 8 x 18 to 16 x 48. All ECC 200 symbols can be recognized by the upper right corner module being light (binary 0).

ECC200 is the newest version of data matrix and supports advanced encoding error checking and correction algorithms (reed-solomon). This algorithms allow the recognition of barcodes that are up to 60% damaged.

The barcode supports two optional mechanisms:

• The "Extended Channel Interpretation" (ECI) mechanism enables characters from other character sets (e.g. Arabic, Cyrillic ..) and other data interpretations or industry-specific requirements to be represented.
• The "Structured append" allows files of data to be represented as a secuence of up to 16 Data Matrix symbols. The original data or file can be reconstructed regardless of the order of the symbols.

RDataMatrix supports:

• All sizes and formats (from 10x10 till 144x144)
• Ascii, text , C40 and Base256 (for binary data) encoding.
• The "Extended Channel Interpretation and Structured append

Formats

RDataMatrix supports all data matrix formats. The following table contains the size , the capacity and the correction error features of each format:

Encoding

The data represented in the symbol can be compressed using one or several of the following algorithms:

• ASCII: it is used to encode data that mainly contains ascii characters (0-127). It encodes one alphanumeric or two numeric characters per byte.
• C40: it is used to encode data that mainly contains numeric and upper case characters. C40 encodes three alphanumeric data characters into two bytes.
• TEXT: it is used to encode data that mainly contains numeric and lowercase characters. TEXT encodes three alphanumeric data characters into two bytes.
• BASE256: it is used to encode 8 bit values.

All encoding system can be used to encode any data, but for example, encoding binary data with C40 generates much more overhead (longer symbol) than with BASE256.

Control characters

RDataMatrix uses the character ~ to recognize some special characters in the input data. The following possibilities are available:

• ~X is used to represent character values from 0 to 26. Replace the X like in the following example ~@ = means character ascii 0, ~A= means character 1, ~B=means character 2, ~C=means character 3 ...
• ~1: represents the character FNC1. When FNC1 appears in the first position (or in the fifth position of the first symbol of a Structured Append), it will indicate that the data conforms to the UCC/EAN Application Identifier standard format.
• ~2: It is used to represent Structured Append. Structured Append is used to link information from several symbols in a secuence. The ~2 must be followed by 3 additional bytes. The first 4 bits of the first byte identify the position of the particular symbol in the secuence . The last 4 bits identify the total number of symbols in the secuence. The second and third bytes are used as a file identifier are can have a value between 1 and 254 (up to 254*254=64516 identifiers). See Data Matrix Specification for more information about this (ISO 16022).
• ~3: This character is only allowed in the first position of the symbol. It indicates that the data contains commands for the barcode reader.
• ~4: not allowed.
• ~5 and ~6: These characters are only allowed in the first position of the symbol. If ~5 is used the header [)> ascii30 ascii05 ascii29 will be transmitted by the barcode reader before the data in the symbol and the trailer ascii30 ascii04 will be transmitted after the data. If a ~6 is used , the header [)> ascii30 ascii05 ascii29 will be transmittedby the reader before the data and the trailer ascii30 ascii04 will be transmitted afterwards.
• ~7NNNNNN specifies the Extended Channel to be used, where NNNNNN is a value between and 000000 - 999999. For example: ~7000010 means Extended Channel 10 . Extended channel is used for using other character sets other than ascii. See Data Matrix Specification for more information about this (ISO 16022).
• ~dNNN represents the ascii character encoded by the 3 digits NNN. For exmaple, ~d065 represents the character 'A'.

Test application

The product includes a small demo application which creates BMP files. The program is called datamatrix.exe and supports the following options

• -file: output bmp file
• -encoding: (see table below)
• -format: (see table below)
• -code: value to encode
• -dataFile: input file which contains the value to encode

example:

datamatrix.exe -file datamatrix.bmp -encoding 0 -format 0 -code 1234567890

will encode the value 1234567890 using ASCII encoding.

DLL

The DLL file datamatrix.dll has one entry point defined as:

void createDatamatrix(char format,char encoding,unsigned short int dataLen,char* data,char* file);

where:

• format: see table below
• encoding: see table below
• dataLen: length of data to be encoded
• data: pointer to the data to be encoded
• file: name of the BMP file to be created

The following Visual Basic 6.0 code shows how to call the DLL :

Private Declare Sub createDatamatrix Lib "datamatrix.dll" (ByVal format As Byte, ByVal encoding As Byte, ByVal datalen As Integer, FirstDataElement As Byte, name As Byte)

.......

Dim data(100) As Byte
Dim file(100) As Byte
Dim format As Byte
Dim encoding As Byte
Dim dataLen As Byte
Dim h As Integer

file(0) = Asc("c")
file(1) = Asc(":")
file(2) = Asc("\")
file(3) = Asc("a")
file(4) = Asc(".")
file(5) = Asc("b")
file(6) = Asc("m")
file(7) = Asc("p")
file(8) = 0

dataLen = 100 ' encode 100 A
For h = 0 To i - 1
data(h) = Asc("A")
Next

format = 1
encoding= 3 ' base265

createDatamatrix format, encoding, i, data(0), file(0)

C++ source code

If you want to compile the source code together with your C++ application you can use the following code for creating a bmp file:

string filename="c:\\datamatrix.bmp";

RDatamatrix* m= new RDatamatrix();

m->codeBinary=d;
m->codeBinaryLength=dataLen;
m->encoding=3;
m->preferredFormat=0;

m->paint();

// create now bmp file

bitmapfile* bmp= new bitmapfile();
bmp->write(filename,m->bitmap,m->rows,m->cols);

delete bmp;
delete m;

if you want to read the datamatrix bitmap array instead of create a bmp file you must use:

m->getBitmapEntry(col,row);

where:

• 0<= col < m->cols
• 0<= row < m->rows

PDF417

PDF stands for “Portable Data File.” A two-dimensional symbology (2D), a single PDF417 symbol carries up to 1.1 kilobytes of machine-readable data in a space no larger than a standard bar code. And, unlike one-dimensional bar codes (1D), which are just a key linked to a database, PDF417 symbols contain the database itself. That means, you don't have to store an article number in the barcode but you can also store the name , the size , the color, the name of the manufacturer etc...

RPDF417 support:

• PDF417
• Marco PDF 417. This version allows to concatenate several PDF417 symbols in order to encode larger amount of information.
• Compact/Truncated PDF417. This is a smaller version of PDF417 which can be used in clean environments.

Formats

The symbol has the following format:

• Number of rows: 3 to 90
• Number of columns 1 to 30

where number of rows * number of columns must be <= 928.

Each symbol character is made of 17 modules, 4 bars and 4 space elements (bars), with the largest element 6 modules wide.

The maximum possible number of data characters per symbol (at error correction level 0) is:

• Text Compaction mode: 1 850 characters
• Byte Compaction mode: 1 108 characters

Encoding

The data represented in the symbol can be compressed using one or several of the following algorithms:

• BINARY: it can encode any character between 0 and 255.
• TEXT: The Text Compaction mode includes all the printable ASCII characters (i.e. values from 32 to 126) and three ASCII control characters: HT or tab (ASCII value 9), LF or line feed (ASCII value 10), and CR or carriage return (ASCII value 13).
• NUMERIC: encodes digits only.

Test application

The product includes a small demo application which creates BMP files. The program is called pdf417.exe and supports the following options

• -file: output bmp file
• -mode: see table below
• -cols: number of columns in the symbol (any value between 1 and 30).
• -rows: maximum number of rows in the symbol (any value between 3 and 90).
• -eclevel: values between 0 and 8.
• -code: value to encode
• -dataFile: input file which contains the value to encode

example:

pdf417.exe -file pdf417.bmp -mode 0 -cols 10 -eclevel 3 -code 1234567890

will encode the value 1234567890 using BYTE encoding.

DLL

The DLL file pdf417.dll has one entry point defined as:

void createPDF417(char cols,char rows,char maxrows,char mode,char eclevel,unsigned short int dataLen,char* data,char* file)

where:

• cols: number of columns in the symbol (any value between 1 and 30).
• rows: number of rows in the symbol (any value between 3 and 90).
• maxrows: maximum number of rows in the symbol (any value between 3 and 90).
• mode: see table below
• eclevel: values between 0 and 8.
• dataLen: length of data to be encoded
• data: pointer to the data to be encoded
• file: name of the BMP file to be created

The following Visual Basic 6.0 code shows how to call the DLL :

Private Declare Sub createPDF417 Lib "pdf417.dll" (ByVal cols As Byte, ByVal rows As Byte, ByVal maxrows As Byte, ByVal mode As Byte, ByVal level As Byte, ByVal datalen As Integer, FirstDataElement As Byte, name As Byte)

 

.......

Dim data(100) As Byte
Dim file(100) As Byte
Dim dataLen As Byte
Dim h As Integer

file(0) = Asc("c")
file(1) = Asc(":")
file(2) = Asc("\")
file(3) = Asc("a")
file(4) = Asc(".")
file(5) = Asc("b")
file(6) = Asc("m")
file(7) = Asc("p")
file(8) = 0

dataLen = 100 ' encode 100 A
For h = 0 To i - 1
data(h) = Asc("A")
Next

format = 1
encoding= 0 ' BYTE

createPDF417 3, 3, 10, 0, 1, dataLen, data(0), file(0)

C++ source code

If you want to compile the source code together with your C++ application you can use the following code for creating a bmp file:

string filename="pdf417.bmp";

RPDF417* m= new RPDF417();
m->code="12345678901234567890123456789012345678901234567890";
m->PDFMode=2; //PDF_TEXT;
m->PDFColumns=3;
m->PDFMaxRows=10;
m->PDFECLevel=3;

m->paint();

// create now bmp file
bitmapfile* bmp= new bitmapfile();

bmp->write(filename,m->pixelbitmap,m->pixelbitmapHeight,m->pixelbitmapWidth);

delete bmp;
delete m;

if you want to read the datamatrix bitmap array instead of create a bmp file you must use:

m->getBitmapEntry(col,row);

 

Macro PDF 417

This option allows to concatenate several PDF417 symbols in order to encode large amount of information. This is achieved by encoding several barcodes (segments) which include a Macro PDF 417 control header. The control header contains a file id field which is used to know which barcodes below together, and a segment number to know the sequence of the barcodes. There are other header fields, line sender, timestamp, filename ... which are optional.

You can use 2 approches:

1. Split the data to be encodes in several chunks and encode each segment as in this example:
   
   // this example assumes we encode 2 segments
   
   m->codeBinary=inputDataPart1; // data to be encoded , chunk 1
   m->PDFMacroSegmentCount=2; // number of segment
   m->PDFMacroSegment=0; // first segment
   m->PDFMacroLastSegment=false;
   m->PDFColumns=10; // the size of the barcode (columns and rows) determines the capacity of the symbol (number if bytes that can encode)
   m->PDFMaxRows=10;
   m->PDFRows=10;
   
   int* fileId=new int[4];
   fileId[0]=1; // any value for the file id
   fileId [1]=2;
   fileId [2]=3;
   fileId [3]=-1; // last element must be -1
   m->PDFMacroFileId=fileId;
   
   m->paint(); // encode first segment
   
   bitmapfile* bmp= new bitmapfile();
   bmp->write("segment1.bmp",m->pixelbitmap,m->pixelbitmapHeight,m->pixelbitmapWidth);
   ........
   
   // encode second segment
   m2->codeBinary=inputDataPart2; // data to be encoded , chunk 2
   m2->PDFMacroSegmentCount=2; // number of segment
   m2->PDFMacroSegment=1; // second segment
   m2->PDFMacroLastSegment=true; // this is the last one
   m2->PDFMacroFileId=fileId; // must be the same as for segment 1
   .......
   
   m2->paint(); // encode second segment
   
   bmp->write("segment2.bmp",m2->pixelbitmap,m2->pixelbitmapHeight,m2->pixelbitmapWidth);
   
   
   
2. Let the component figure out the number of segments required.
   
   
   m->codeBinary=inputData;
   int* fileId=new int[4];
   fileId[0]=1; // any value for the file id
   fileId [1]=2;
   fileId [2]=3;
   fileId [3]=-1; // last element must be -1
   m->PDFMacroFileId=fileId; // always set file id
   
   m->resetMacroPDF();
   m->prepareMacroPDF(); // after this call m->PDFMacroSegmentCount contains the number of segments required to encode the data
   
   // paint all segments
   bitmapfile* bmp2= new bitmapfile();
   
   for (int i=0;i<m->PDFMacroSegmentCount;i++) {
   
   m->PDFMacroSegment=i; // paint segments one by one
   m->paint();
   bmp2->write(filename,m->pixelbitmap,m->pixelbitmapHeight,m->pixelbitmapWidth);
   
   }
   
   

QRCode

QR Code is a matrix symbology which includes a finder pattern located at three corners of the symbol used to locate the symbol and figure out its size and orientation. The QRCode following features are supported

• AUTO, BYTE, ALPHA, NUMERIC and KANJI encoding. QR Code symbols can endode the following amount of data (for maximum symbol size - Version 40, error correction level L):
  • numeric data: 7,089 characters
  • alphanumeric data: 4,296 characters
  • 8-bit byte data: 2,953 characters
  • Kanji data: 1,817 characters
• Structured append. This allows files of data to be represented logically and continuously in up to 16 QR Code symbols. These may be scanned in any sequence to enable the original data to be correctly reconstructed.
• Versions 1 to 40. The version is the size of the symbol. Version 1 is a 21x21 matrix and version 40 is a 177x177 matrix.
• Error correction levels L, H, M and Q.
• FNC1 mode. FNC1 mode is used for messages containing data formatted either in accordance with the UCC/EAN Application Identifiers standard or in accordance with a specific industry standard previously agreed with AIM International.
• Extended channel interpretation: This mechanism enables data using character sets other than the default encodable .

J4L-QRCode supports:

• QRCode mode 2 symbols (not mode 1)
• All versions 1-40. Automatic selection of the version is also supported.
• All encoding method (numeric, alphanumeric, byte and kanji). Automatic selection of the encoding method is also supported.
• Structured append.
• Extended Channel Interpretation (only 1 per symbol, no nesting supported).
• All 4 error correction levels.
• FNC1 indicators

Formats

Encoding

The data represented in the symbol can be compressed using one or several of the following algorithms:

• ALPHA = 0: encodes alphanumeric characters (digits 0 - 9; upper case letters A -Z; nine other characters: space, $ % * + - . / : ); )
• BYTE: encodes binary values ( 8-bit data)
• NUMERIC: encodes numeric values only (digits 0-9)
• KANJI: encodes Kanji characters. Kanji characters in QR Code can have values 8140 -9FFC and E040 - EBBF

Control characters

J4L-QRCode uses the character ~ (tilde) to recognize some special characters in the input data:

• ~dNNN represents the ascii character encoded by the 3 digits NNN. For exmaple, ~d065 represents the character 'A'.

Test application

The product includes a small demo application which creates BMP files. The program is called datamatrix.exe and supports the following options

• -file: output bmp file
• -encoding: (see table below)
• -format: (see table below)
• -code: value to encode
• -level: error correction level (see table below)
• -tilde: process tilde (1 for true, 0 for false)
• -dataFile: input file which contains the value to encode

example:

qrcode.exe -file qrcode.bmp -encoding 4 -format 0 -level 0 -code 1234567890

will encode the value 1234567890 using AUTO encoding.

DLL

The DLL file datamatrix.dll has one entry point defined as:

void createQRCode(char format,char encoding,char level,unsigned short int dataLen,char* data,char* file);

where:

• format: see table in the formats section. The format is the number of the QRCode version minus 1.
• encoding: see table below
• level: see table below
• dataLen: length of data to be encoded
• data: pointer to the data to be encoded
• file: name of the BMP file to be created

The following Visual Basic 6.0 code shows how to call the DLL :

Private Declare Sub createQRCode Lib "qrcode.dll" (ByVal format As Byte, ByVal encoding As Byte, ByVal level as Byte, ByVal datalen As Integer, FirstDataElement As Byte, name As Byte)

.......

Dim data(100) As Byte
Dim file(100) As Byte
Dim format As Byte
Dim encoding As Byte
Dim level as Byte
Dim dataLen As Byte
Dim h As Integer

file(0) = Asc("c")
file(1) = Asc(":")
file(2) = Asc("\")
file(3) = Asc("a")
file(4) = Asc(".")
file(5) = Asc("b")
file(6) = Asc("m")
file(7) = Asc("p")
file(8) = 0

dataLen = 100 ' encode 100 A
For h = 0 To i - dataLen
data(h) = Asc("A")
Next

format = 1
level=0
encoding= 4' AUTO

createQRCode format, encoding, level, dataLen, data(0), file(0)

C++ source code

If you want to compile the source code together with your C++ application you can use the following code for creating a bmp file:

string filename="c:\\qrcode.bmp";

QRCode* m= new QRCode();

m->setBinaryCode(data,dataLen); // where data is int*
m->encoding=encoding; // 4, AUTO, 3 Kanji, 2 numeric, 1 byte, 0 alpha
m->correctionLevel=level; // 0-L , 1-M, 2-Q , 3-H
m->preferredVersion=format; // 0 till 39
m->processTilde=false;


/* m->setFnc1Mode(2);

//strcutured append configuration

m->setStructuredAppend(true);
m->setStructuredAppendCounter(2);
m->setStructuredAppendIndex(1);*/

m->paint();

// create now bmp file

bitmapfile* bmp= new bitmapfile();
bmp->write(filename,m->bitmap,m->rows,m->cols);

delete bmp;
delete m;

if you want to read the datamatrix bitmap array instead of create a bmp file you must use:

m->getBitmapEntry(col,row);

where:

• 0<= col < m->cols
• 0<= row < m->rows

Aztec code

Aztec Code is a 2D matrix symbology made up of square modules on a square grid, with a square bullseye pattern at their center. Aztec Code symbols can encode large amounts of data with user defined error correction level.

The smallest format can encode 13 numeric , 12 alphabetic characters or 6 bytes of data, while the largest format can encode 3832 numeric ,3067 alphabetic characters or 1914 bytes of data.

Compact formats can be used to encode short messages in a more efficient manner than full range formats. Note that reader/decoder can autodiscrimanate between both formats.

There are also a set of 256 special formats called "Aztec runes" which can be used for encoding values 0 to 255 for special applications.

RAztecCode supports:

• All Aztec code formats (compact and full range).
• Normal and binary encoding.
• Structured append. This allows you to encode large messages by means of a secuence of symbols.
• Extended Channel Interpretation.
• Reader initialization bit.
• Aztec Runes.

Formats

Available formats are:

Encoding

The data represented in the symbol can be compressed using one of the following algorithms:

• NORMAL: can encode any character but it is not very efficient encoding binary values (values above 128).
• BINARY: use this mode only if your data contains many bytes/characters above 128.

Control characters

J4L-Aztec uses the character ~ to recognize some special characters in the input data (if the processTilde option has been activated). The following possibilities are available:

• ~~: will be replaced with ~
• ~dxxx: will be replaced by the character whose ascii code is xxx. For example ~d065 will be replaced with A.
• ~F: will be replaced with the FNC1 flag (allowed as first codeword only).
• ~Exxxxxx: will be replaced with the Extended Interpretation Channel flag xxxxxx. For example to activate Extended Interpretation Channel 1, use ~E000001.

Test application

The product includes a small demo application which creates BMP files. The program is called aztec.exe and supports the following options

• -file: output bmp file
• -encoding: (see table below)
• -format: see table in the formats section. The smallest configuration has the value 0 and the largest 35.
• -code: value to encode
• -level: error correction level, default is 23, (23%) .
• -tilde: process tilde (1 for true, 0 for false)
• -dataFile: input file which contains the value to encode

example:

aztec.exe -file aztec.bmp -encoding 0 -format 0 -level 23 -code 1234567890

will encode the value 1234567890 using NORMAL encoding.

DLL

The DLL file aztec.dll has one entry point defined as:

void createAztec(char format,char encoding, char level ,unsigned short int dataLen,char* data,char* file);

where:

• format: see table in the formats section. The smallest configuration has the value 0 and the largest 35.
• encoding: see table below
• level: error correction level, default is 23, (23%) .
• dataLen: length of data to be encoded
• data: pointer to the data to be encoded
• file: name of the BMP file to be created

The following Visual Basic 6.0 code shows how to call the DLL :

Private Declare Sub createAztec Lib "aztec.dll" (ByVal format As Byte, ByVal encoding As Byte, ByVal level as Byte, ByVal datalen As Integer, FirstDataElement As Byte, name As Byte)

.......

Dim data(100) As Byte
Dim file(100) As Byte
Dim format As Byte
Dim encoding As Byte
Dim level as Byte
Dim dataLen As Byte
Dim h As Integer

file(0) = Asc("c")
file(1) = Asc(":")
file(2) = Asc("\")
file(3) = Asc("a")
file(4) = Asc(".")
file(5) = Asc("b")
file(6) = Asc("m")
file(7) = Asc("p")
file(8) = 0

dataLen = 100 ' encode 100 A
For h = 0 To dataLen- 1
data(h) = Asc("A")
Next

format = 0
level=23
encoding= 0

createAztec format, encoding, level, dataLen, data(0), file(0)

C++ source code

If you want to compile the source code together with your C++ application you can use the following code for creating a bmp file:

string filename="c:\\aztec.bmp";

Aztec* m= new Aztec();

m->setBinaryCode(d,dataLen);
m->setEncoding(1); // 0 normal , 1 binary
m->setPreferredConfiguration(0);
m->setAutoConfigurate(true);
m->setConfigurationType(0); // 0 any, 1 compact, 2 full
m->setProcessTilde(false);

// configuration for structured append
/*m->setStructuredAppend(true);
m->setStructuredAppendCounter(2);
m->setStructuredAppendIndex(1);
m->setFileId("ABC");*/

m->paint();

// create now bmp file

bitmapfile* bmp= new bitmapfile();
bmp->write(filename,m->bitmap,m->rows,m->cols);

delete bmp;
delete m;

if you want to read the datamatrix bitmap array instead of create a bmp file you must use:

m->getBitmapEntry(col,row);

where:

• 0<= col < m->cols
• 0<= row < m->rows