Problem with pasting - applescript

Question

I'm trying to write an apple scrip to search Sparrow (mail client for Mac)
Here is the script:
on run argv
tell application "Sparrow"
activate
end tell
tell application "System Events"
key code 3 using {option down, command down}
keystroke argv
end tell
end run
The problem is that I want the script to take an argument on run so that I can supply it with what to search for, but I can't get it to pastet it out.

Answer 1

argv is always initialized to a list.
You cannot keystroke a list (you have to coerce each item to a string first).
You can never tell the exact number of parameters that will be sent to the script, so a better route would be to iterate through the list and do whatever needs to be done, as shown below:
tell application "System Events"
tell process "Sparrow"
key code 3 using {command down, option down}
repeat with this_item in argv
keystroke (this_item as string)
end repeat
end tell
end tell
#Runar
The script is implying that Sparrow is already activated.
You can't do this as written (the result of every text item of argv is still a list). However, if you coerce the result into a string, this will work, but it will squash everything together (assuming AppleScript's text item delimiters is ""). If you set AppleScript's text item delimiters to space, then this would actually be better than the previous script...
on run argv
tell application "Sparrow" to activate
tell application "System Events"
tell process "Sparrow" --implying Sparrow is already activated
set prevTIDs to AppleScript's text item delimiters
key code 3 using {command down, option down}
set AppleScript's text item delimiters to space
keystroke (every text item of argv) as string
set AppleScript's text item delimiters to prevTIDs
end tell
end tell
end run