Find duplicate pictures

[Lucas]

I tried

Macro Macro7

Code:

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RegisterNetComComponent "$Desktop$\BitmapDetector.dll"
IDispatch d._create("BitmapDetector.BitmapDetectorForm")
double c=0
BITMAP a b
RECT r=d.searchBitmap(a b c)

but

Error in Macro7: unsupported argument type.

What's wrong, how load image in BITMAP variable?