Spawn object on different number of imagepoints

I am making a platformer that would have big blocks which would be randomly generated. These blocks then spawn platforms on their imagepoints, so the locations of the platforms vary from block to block.

Also, the block is a single object; what varies is the frame, so each frame has its imagepoints in a different position.

As long as all the frames have the same number of imagepoints, there's no problem, but I want to make the different frames have a different number of imagepoints and be able to do this.

Here's the example: dropbox.com/s/wgkup3hwh2dd2su/blockproblem.capx

Let's say I want to have 4 imagepoints(not including the origin) on the third frame. How can I do this?

I suspect the expression ImagePointCount can be helpful here but I don't know how...

repeat block.imagepointcount: block spawn platform on layer 0 imagepoint loopindex+1

Thanks a lot, mindfaQ, but doing that generates some problems...

For some reason, the platforms are not spawned correctly; It's as if it ignores the animation frame. I want the frames to show some different graphics, so the frames need to be right!

Here is an updated version with what mindfaQ suggested:

dropbox.com/s/wgkup3hwh2dd2su/blockproblem.capx

That's because you didn't put the loop in a subevent, so it changes the frame of the block in the loop.

<img src="http://666kb.com/i/cjys0x9kw78bd8itj.png" border="0" />