The arcane channeling ability states :
Arcane Channeling (Su): Beginning at 3rd level, you can use a standard action to cast any touch spell you know and deliver the spell through your weapon with a melee attack. Casting a spell in this manner does not provoke attacks of opportunity. The spell must have a casting time of 1 standard action or less. If the melee attack is successful, the attack deals damage normally; then the effect of the spell is resolved.
My question is, does this mean it is a single standard action to both cast the spell into your weapon and attack with it, or is it a standard to cast the spell into the weapon and then a standard to attack with the weapon?