Adobe ColdFusion 8

cffile action = "readBinary"

Note: You can specify this tag's attributes in an attributeCollection attribute whose value is a structure. Specify the structure name in the attributeCollection attribute and use the tag's attribute names as structure keys.

Description

Reads a binary file (such as an executable or image file) on the server, into a binary object parameter that you can use in the page. To send it through a web protocol (such as HTTP or SMTP) or store it in a database, first convert it to Base64 using the ToBase64 function.

Note: This action reads the file into a variable in the local Variables scope. It is not intended for use with large files, such as logs, because they can bring down the server.

Syntax

<cffile 
    action = "readBinary" 
    file = "full pathname"
    variable = "variable name">

See also

cfdirectory

Attributes

Attribute

Req/Opt

Default

Description

action

Required

 

Type of file manipulation that the tag performs.

file

Required

 

Pathname of a binary fine to read.

If not an absolute path (starting with a drive letter and a colon, or a forward or backward slash), it is relative to the ColdFusion temporary directory, which is returned by the GetTempDirectory function.

variable

Required

 

Name of variable to contain contents of binary file.

Usage

You convert the binary file to Base64 to transfer it to another site.

ColdFusion supports reading an image file as a binary and passing the result to a cfimage, for example:

<!--- Convert a JPG image to a binary object. --->
<cffile action="readBinary" file="maxwell05.jpg" variable="binaryObject">
<!--- Create a cfimage from the binary object variable. --->
<cfset myImage=ImageNew(binaryObject)>

Example

The following example reads the binary file somewhere.jpg, writes it to a different folder as somewhereB.jpg, and then displays the new file:

<cffile action = "readBinary" file = "C:\inetpub\wwwroot\cfdocs\getting_started\photos\somewhere.jpg" variable = "aBinaryObj">

<!--- Output binary object to JPEG format for viewing. --->
<cffile action="write" file = "c:\files\updates\somewhereB.jpg" 
    output = "#toBinary(aBinaryObj)#">

<!--- HTML to view image. --->
<img src="C:\files\updates\somewhereB.jpg">