I have a points layer with site attributes and a polygon layer with region attributes. I'd like to join the names of the regions to the point site locations using QGIS 1.8.0., on Windows XP. However, I keep generating an empty shapefile, with no records, but the polygon_region's field names are appended to the end of the points within the empty shapefile. I'm using the default settings for the "Join Attributes by Location" tool. The tool's progress bar indicator seems to advance forward to about 20% complete, then it instantly completes. I'm thinking that it's only processing the header of the shapefile then prematurely "completing"
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My problem resolved using the Join Attributes by Points tool:
I had experienced a problem with the output (spatially joined) shapefile being written with header-column-names only, no data. It was skipping attribute creation even though the points geometries fell inside the polygon geometries. I had used and verified the same coordinate system for both layers and turned off On-The-Fly reprojection, to confirm they should join, and to see if the On-The-Fly option could be the culprit, but still no attributes were created for the join.
My solution was to export the data to a new CRS. I used the most common I knew of: [WGS84 (EPSG/SRID/ 4326)] Bingo--It worked!
If anyone experiences zero attribute creation in their spatial join, and they've made sure their CRS for both layers is exactly the same, and have already turned off On-The-Fly re-projection to confirm they should join, but it still fails, then export your data to WGS84 and try that CRS. That was the difference for me. Perhaps the tool has a problem with certain or custom CRS?