Hi, It seems that you miss at link time #pragma link C++ class MyMainFrame; Please see the chapter "Adding a Class" of the User's Guide at: ftp://root.cern.ch/root/doc/chapter13.pdf Cheers, Ilka kmakonyi@nist.gov wrote: >Dear ROOTers, > >I tried learn the signal/slot capacibility of the ROOT-gui. >Followed the users manual, the interpreted example runs well, but the >"example2a" fails with >"Error in <TQObject::CheckConnectArgs>: slot DoDraw() does not exist" message. >The same code with cint (interpreted) runs well ... >Any suggestions? > >root: v4.00/03 >cint: 5.15.128 >linux debian sarge > >thanks, > >k. > >PS: the "rq...." examples seem to work for me, so I dont know what is the reason >for the fail of the example2a > > >
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