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---
layout: page
title: Specification > Image
header: Pages
---
{% include JB/setup %}
## Summary
STRING message type is used for transferring a character string. It supports character strings up to 65535 bytes.
## Message Types
### STRING
<table border="1" cellpadding="5" cellspacing="0" align="center">
<tbody><tr>
<td align="left" style="background:#e0e0e0;"> Data
</td><td align="left" style="background:#e0e0e0;"> Type
</td><td align="left" style="background:#e0e0e0;"> Description
</td></tr>
<tr>
<td align="left"> ENCODING
</td><td align="left"> uint16
</td><td align="left"> Character encoding type as MIBenum value (defined by IANA). Default=3.
</td></tr>
<tr>
<td align="left"> LENGTH
</td><td align="left"> uint16
</td><td align="left"> Length of string (bytes)
</td></tr>
<tr>
<td align="left"> STRING
</td><td align="left"> uint8[LENGTH]
</td><td align="left"> Byte array of the string
</td></tr>
</tbody></table>
* For character encoding, please refer [IANA Character Sets](http://www.iana.org/assignments/character-sets). US-ASCII (ANSI-X3.4-1968; MIBenum = 3) is strongly recommended.
### GET_STRING
<table border="1" cellpadding="5" cellspacing="0" align="center">
<tbody><tr>
<td style="background:#e0e0e0;"> Data
</td><td style="background:#e0e0e0;"> Type
</td><td style="background:#e0e0e0;"> Description
</td></tr>
</tbody></table>
### STT_STRING
N/A
### STP_STRING
N/A
### RTS_STRING
N/A
## Implementations
The TDATA message type is implemented in the following source code.
* [igtlStringMessage.h](https://github.com/openigtlink/OpenIGTLink/blob/master/Source/igtlStringMessage.h)
* [igtlStringMessage.cxx](https://github.com/openigtlink/OpenIGTLink/blob/master/Source/igtlStringMessage.cxx)
## Contributors
* Junichi Tokuda
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