Using ImageMagick COM object

Hello,

i have hard time getting ImageMagick COM control to work in powershell
script. It works fine in VBScript.

here is what I try:

$img = New-Object -ComObject ImageMagickObject.MagickImage
$msgs = $img.Convert("DSC_0205.JPG", "-resize", "1024x1024",
"DSC_0205_out.JPG")

This complains, that "Cannot find an overload for "Convert" and the argument
count: "4"."

So I try:

$params = @("DSC_0205.JPG", "-resize", "1024x1024", "DSC_0205_out.JPG")
$params
$msgs = $img.Convert($params)

And this says, that: "Argument: '1' should be a
System.Management.Automation.PSReference. Please use [ref]."

So I try:

$msgs = $img.Convert([ref]$params)

and now all i get it same output as when i run convert.exe without any
parameters - the default help text. and, of course, no file converted.

What am i doing wrong here..?

Algirdas wrote: It looks bad when I can't even create a new object that can't be passed
to get-member:

PSH>$img|get-member
An exception was thrown when trying to enumerate the collection: "Object
reference not set to an instance of an object.
".
At line:1 char:5
+ $img <<<<

Now, PowerShell's COM implementation has some issues. I would try:
1. You could call VBScript code form PowerShell, but that defeats the
purpose in most cases.
-or-
2. Try using ImageMagick's .NET assembly from PowerShell.

Marco


--
Microsoft MVP - Windows PowerShell
http://www.microsoft.com/mvp

PowerGadgets MVP
http://www.powergadgets.com/mvp

Blog:
http://marcoshaw.blogspot.com

Yeah, that's what i had too! I just thought i'm doing something wrong..
It does - i might aswell call it from command line then (which i'm doing
now). Just wanted to make it more slick.
I wasn't even aware such existed! I'll try to read about it.

http://midimick.com/magicknet/

It seems pretty immature... A pre-compiled DLL doesn't seem to be provided.

I provided the information without actually reading all the details...

Marco