When we run our program with the VS compiler, there may be some questions about 1> LINK: Fatal Error LNK1168: Cannot open… DLL for writing or 1& GT; LINK: Fatal Error LNK1168: Cannot open… Exe to write, this is mainly because the process already exists, we can end the process of the program, we can open the “process Manager”, Ctrl+Alt+ DELETE key combination, and then find the corresponding process right-click to end.