错误21错误LNK2019:未解决的外部符号:…

I tried to create a .h file starting to a .cpp flie. I'm quite sure that the header is correct, but when i try to use the functions of the .cpp file in an other of my project I have a lot of link problems. So I attached the files here, surely someone can give me some solutions. The first solution of check the properties of the project, properties->linker->additional libraries, I have already done. I tried to create a .h file starting to a .cpp