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# `BinaryLengthPacker` description and examples
Some MsgFields have defined the `LEN` subfield, see the [field-types.md](../field-types.md) description.
The following example shows how to define a field length in the binary format
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of the binary length definition",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/binary/BinaryLengthPackerTest.java",
"beginString": " FieldBuilder.builder(MsgFieldType.LEN_VAL)",
"endString": ".defineBodyPacker(BcdBodyPacker.leftPadding0());",
"indentation": ""
}
} &&endPlaceholder
```
The field structure then looks like the next example
```XML
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "MsgField dump",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "BinaryLengthPackerTest - MsgField structure dump: ",
"includeBeginString": "false",
"endString": "\"/>",
"indentation": ""
}
} &&endPlaceholder
```
The following example shows how to pack and unpack a value to the defined field
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of binary length packing and unpacking",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/binary/BinaryLengthPackerTest.java",
"beginString": " String value = \"123456789\";",
"endString": "assertEquals(value, msgValue.getBodyValue(String.class));",
"indentation": " "
}
} &&endPlaceholder
```
The packed `FieldValue` with `lenHex` looks like the next example
```XML
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "MsgValue dump",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "BinaryLengthPackerTest - MsgValue structure dump: ",
"includeBeginString": "false",
"endString": "\"/>",
"indentation": ""
}
} &&endPlaceholder
```
Some examples of packed values
```
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Some examples of packed values",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "Examples of integers packed with BinaryLengthPacker",
"includeBeginString": "true",
"endString": "Examples end.",
"includeEndString": "false",
"indentation": ""
}
} &&endPlaceholder
```
More examples see [complex-example.md](../complex-example.md).
