How to achieve 7z format compression?

[kyjdp]

I google search results, see someone with 7z.dll a file, the definition of the function of calling dll, achieved in the Cs code to achieve the compression of the file is also decompression, I think in QM should also be able to achieve, Than the above code should be good, The above code requires two files, 7z.exe and 7z.dll! how to write a function? How to call?