I don't think the DSC-WX150 is completely PictBridge compatible. If your printer can has a compatible memory card (MS Duo or SD/SDHC/SDXC) reader, then you should be able to print without connecting the camera to a computer. The manual only lists printing still images from the memory card or after importing the images to a computer. See http://docs.esupport.sony.com/dvimag/DSCWX100_WX150_guide/en/contents/09/01/01/01.html .
I hope this helps.
Cindy Wells