If you are traveling to Canada with Canadian passport in most cases you do not need to obtain entry visa to Canada at the consulate beforehand. The period of stay though may be limited by the laws of Canada. You may check what is the allowed period of stay at the Canada consulate in Canada. All other applicants should check information on Canada visa requirements, procedure, application forms, fees and processing timings may be found here: http://canada.visacenter.ca.
If you are traveling to Canada with Canadian passport in most cases you do not need to obtain entry visa to Canada at the consulate beforehand. The period of stay though may be limited by the laws of Canada. You may check what is the allowed period of stay at the Canada consulate in Canada. All other applicants should check information on Canada visa requirements, procedure, application forms, fees and processing timings may be found here: http://canada.visacenter.ca.