how to use win32 shell32 APIs method

[LJRFox]

For example, the following three methods

ExtractAssociatedIcon(int hInst, Pointer pszIconPath, Pointer piIcon)

FindExecutable(Pointer lpFile, Pointer lpDirectory, Pointer lpResult)

SHCreateItemFromParsingName(Pointer pszPath, Pointer pbc, Pointer riid, Pointer<Pointer> ppv)

I have no idea what parameters to pass in and how to get the return value. Someone can show me a demo