Getting Image Width And Height Using GraphicsMagick And Lucee CFML 5.2.9.31

<cfscript>

	// NOTE: Defaulting to a valid filename just so we don't have to wrap conditional
	// logic around the rest of the page processing.
	param name="url.filename" type="string" default="boop.jpg";

	startedAt = getTickCount();

	// CAUTION: Since this is a demo, it's OK to just read a file off the file-system
	// based on a user-provided value. However, in a production environment, you would
	// want to treat the given filename with much suspicion!
	inputFilepath = expandPath( "../images/#url.filename#" );

	// All of the image utilities are provided through the GraphicsMagick binary.
	command = "gm";

	// We're going to use the Identify utility to read the image dimensions.
	utility = "identify";

	// We want to be EXPLICIT about which input reader GraphicsMagick should use.
	// If we leave it up to "automatic detection", a malicious actor could fake
	// file-type and potentially exploit a weakness in a given reader.
	// --
	// READ MORE: http://www.graphicsmagick.org/security.html
	utilityReader = listLast( inputFilepath, "." ).lcase();

	// Setup the options for the Convert utility.
	commandOptions = [
		utility,

		// The identify command will write image properties to the standard-output. We
		// can use the -format to determine which properties will be output and in which
		// order. %w = width, %h = height. In this case, we're outputting them as a
		// comma-delimited list so that we can easily parse the output.
		// --
		// Read More: http://www.graphicsmagick.org/GraphicsMagick.html#details-format
		// --
		// CAUTION: I am using a trailing comma because a GIF image will output
		// dimensions for EACH PAGE in the GIF animation. As such, the trailing comma
		// prevents two subsequent pages from mucking with each others readings.
		"-format %w,%h,",

		// Provide the source image to be read with the an explicit reader.
		( utilityReader & ":" & inputFilepath )
	];

	// Execute GraphicsMagick on the command-line.
	execute
		name = command
		arguments = commandOptions.toList( " " )
		variable = "successResult"
		errorVariable = "errorResult"
		timeout = 5
	;

	duration = ( getTickCount() - startedAt );

	// If the error variable has been populated, it means the CFExecute tag ran into
	// an error - let's dump-it-out and halt processing.
	if ( variables.keyExists( "errorVariable" ) && errorVariable.len() ) {

		dump( errorVariable );
		abort;

	}

	// At this point, the successResult will contain the comma-delimited list of image
	// properties. We can simply parse it into an array.
	// --
	// NOTE: GIF images may contain more than two indices. In that case, the first two
	// will pertain to the first page in the animation.
	imageProperties = successResult.listToArray();
	width = imageProperties[ 1 ];
	height = imageProperties[ 2 ];

</cfscript>

<cfoutput>

	<!--- List all of the images in the test directory. --->
	<p style="width: 650px ;">
		<cfloop query="#directoryList( path = '../images', listInfo = 'query', sort = 'name asc' )#">

			<a href="./index.cfm?filename=#encodeForHtmlAttribute( name )#">
				#encodeForHtml( name )#
			</a>,

		</cfloop>
	</p>

	<ul>
		<li><strong>Filename:</strong> #encodeForHtml( url.filename )#</li>
		<li><strong>Width:</strong> #numberFormat( width )# px</li>
		<li><strong>Height:</strong> #numberFormat( height )# px</li>
		<li><strong>Duration:</strong> #numberFormat( duration )# ms</li>
	</ul>

	<p>
		<img
			src="../images/#encodeForHtmlAttribute( url.filename )#"
			width="600"
			style="border: 1px solid ##cccccc ; display: block ;"
		/>
	</p>

</cfoutput>