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please ask only OpenCV related question, The answers to your question are here:

• google with "C++ check if a file exists"
• google with "C++ PrintFullPath"
• google with "C++ Visual Studio Debug Working Directory"

BTW the debugger runs form the path as defined in Project Properties > Configuration Progerties > Debugging > Working Directory. I suggest to configure that with $(TargetDir) to be sure that the debuggers runs from same path where is your executable.