It works the way you described:
%x[wkhtmltopdf "http://www.radiozamaneh.com/67671" "./kaka.pdf"]
Loading page (1/2)
QFont::setPixelSize: Pixel size <= 0 (0) ] 38%
QFont::setPixelSize: Pixel size <= 0 (0)=============> ] 88%
QFont::setPixelSize: Pixel size <= 0 (0)==============> ] 89%
QFont::setPixelSize: Pixel size <= 0 (0)==============> ] 89%
QFont::setPixelSize: Pixel size <= 0 (0)===============> ] 90%
QFont::setPixelSize: Pixel size <= 0 (0)===============> ] 90%
Printing pages (2/2)
QFont::setPixelSize: Pixel size <= 0 (0)
Done
=> ""
So, obvious questions:
- Do you have this program installed in your box?
- The user that is running rails have the binary on its $PATH variable?