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# `AsciiBodyPacker` examples
The following example shows how to define a field with body in [ASCII](https://en.wikipedia.org/wiki/ASCII) format
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of ASCII body definition",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/asciihex/AsciiBodyPackerTest.java",
"beginString": " private FieldBuilder fixedLengthAscii() {",
"endString": " }",
"indentation": ""
}
} &&endPlaceholder
```
The field structure
```XML
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "MsgField dump",
"parameters": {
"sourceRelativePath": "iso-8583-packer/log/iso-8583-packer.log",
"beginString": "AsciiBodyPackerTest - MsgField structure dump: ",
"includeBeginString": "false",
"endString": "\"/>",
"indentation": ""
}
} &&endPlaceholder
```
The following example shows how to pack the field value
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of ASCII value packing",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/asciihex/AsciiBodyPackerTest.java",
"beginString": " FieldBuilder fieldBuilder = fixedLengthAscii();",
"endString": "assertEquals(\"6162\", bytesHex);",
"indentation": " "
}
} &&endPlaceholder
```
And the following example shows how to unpack the field bytes to a value
```Java
&&beginPlaceholder {
"className": "com.credibledoc.substitution.content.generator.code.SourceContentGenerator",
"description": "Example of ASCII value unpacking",
"parameters": {
"sourceRelativePath": "iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/asciihex/AsciiBodyPackerTest.java",
"beginString": " byte[] bytes = HexService.hex2byte",
"endString": "assertEquals(\"ab\", msgValue.getBodyValue(String.class));",
"indentation": " "
}
} &&endPlaceholder
```
The packed `FieldValue` then 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": "AsciiBodyPackerTest - 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 values packed with AsciiBodyPacker",
"includeBeginString": "true",
"endString": "Examples end.",
"includeEndString": "false",
"indentation": ""
}
} &&endPlaceholder
```
The source of the test is located in GitHub [AsciiBodyPackerTest.java](https://github.com/credibledoc/credible-doc/blob/master/iso-8583-packer/src/test/java/com/credibledoc/iso8583packer/asciihex/AsciiBodyPackerTest.java)
More examples see [complex-example.md](../complex-example.md).
