powershell - Using the call '&' operator with multiple parameters -

            $simagemagickhome = "c:\imagemagick"             $simagemagickconv = "$simagemagickhome\convert.exe"             $simagemagickargs = @(  '--%',                              '-background transparent',                              '-fill hsb(0,0,0)',                              '-font arial',                             '-pointsize 18',                             '-size 18x26',                             '-gravity center')               ( $i = 0x01; $i -le 0x05; $i++ )             {                 $y = [char]$i                 & $simagemagickconv $simagemagickargs label:$y $scharsdir\$y.png                 #write-host $simagemagickconv $simagemagickargs label:$y $scharsdir\$y.png             } 

using write-host can example copy paste command line , find run correctly if run single line powershell prompt:

c:\imagemagick\convert.exe --% -background transparent -fill hsb(0,0,0) -font arial -pointsize 18 -size 18x26 -gravity center label:☺ c:\users\erics_000\desktop\output\chars\☺.png 

using call operator '&' inside script not work @ , leads error messages:

convert.exe: unabletoopenblob `--%': no such file or directory @ error/blob.c/openblob/2697. convert.exe: nodecodedelegateforthisimageformat `' @ error/constitute.c/readimage/501. convert.exe: unrecognizedoption `-background transparent' @ error/convert.c/convertimagecommand/858. 

the article have been reading is: http://social.technet.microsoft.com/wiki/contents/articles/7703.powershell-running-executables.aspx

thank you...

the following script works me:

$simagemagickhome = "c:\dev\im" $simagemagickconv = "$simagemagickhome\convert.exe" $simagemagickargs = @('-background', 'transparent',                  '-fill', 'hsb(0,0,0)',                  '-font', 'arial',                 '-pointsize', '18',                 '-size', '18x26',                 '-gravity', 'center')   ( $i = 65; $i -le 67; $i++ ) {     $y = [char]$i     & $simagemagickconv $simagemagickargs label:$y c:\dev\$y.bmp } 

note cannot write-host arguments , try running command line, powershell special processing & operator (adds quotes needed), not when pass same arguments write-host.

you'd want install pscx , play around echoargs utility bundled gain better understanding of how arguments passed.