Description
Converts binary data to a string.
Returns
An encoded string representing the binary data.
Category
Conversion functions, String functions
Function syntax
BinaryEncode(binarydata, encoding) |
See also
BinaryDecode, CharsetEncode, CharsetDecode
History
ColdFusion MX 7: Added this function.
Parameters
Parameter |
Description |
|---|---|
binarydata |
A variable containing the binary data to encode. |
encoding |
A string that specifies the encoding method to use to represent the data; one of the following:
|
Usage
Binary objects and, in some cases, 8-bit characters, cannot be transported over many Internet protocols, such as HTTP and SMTP, and might not be supported by some database systems. By Binary encoding the data, you convert the data into a format that you can transfer over any Internet protocol or store in a database as character data. To convert the data back to a binary format, use the BinaryDecode function. Adobe recommends that you use the BinaryEncode function, and not the ToBase64(binarydata) function, to convert binary data to Base64 data in all new applications.This function provides a superset of the functionality of the ToBase64(binarydata) function.See the following pages for additional information on handling binary data:
- cffile for loading and reading binary data
- cfwddx for serializing and deserializing binary data
- IsBinary for checking variables for binary format
- Len for determining the length of a binary object
Example
The following example reads a GIF file as binary data, converts it to a binary-encoded string, converts the binary-encoded data back to binary data, and writes the result to a file. It displays the encoded string and the image in the output file.
| <h3>Binary Encoding Conversion Example</h3> <!--- Do the following if the form has been submitted. ---> <cfif IsDefined("Form.binEncoding")> <!--- Read in a binary data file. ---> <cffile action="readbinary" file="C:\images\help.gif" variable="binimage"> <!--- Convert the read data to binary encoding and back to binary data. ---> <cfscript> binencode=BinaryEncode(binimage, Form.binEncoding); bindecode=BinaryDecode(binencode, Form.binEncoding); </cfscript> <!---Write the converted results to a file. ---> <cffile action="write" file="C:\temp\help.gif" output="#bindecode#" addnewline="No" > <!--- Display the results. ---> <cfoutput> <p><b>The binary encoding:</b> #Form.binEncoding#</p> <p><b>The image converted into a binary-encoded string by BinaryEncode </b><br> #binencode#</p> <p><b>The image as written back to a file after converting back to binary using BinaryDecode</b><br> <img src="C:\temp\help.gif"><br></p> </cfoutput> </cfif> <!--- The input form. ---> <form action="#CGI.SCRIPT_NAME#" method="post"> <b>Select binary encoding</b><br> <select size="1" name="binEncoding" > <option selected>UU</option> <option>Base64</option> <option>Hex</option> </select><br> <br> <input type = "Submit" value = "convert my data"> </form> |
