What is the CsWin32 way to handle API failures and access error information?

[netcorefan1]

The title says it all.

if (ret.IsNull) {
   var err = new Win32Exception(Marshal.GetLastWin32Error())
}

The above is not reliable and sometime returns The operation completed successfully. even on failures.
Does CsWin32 provides some implementarion for error handling?

[AArnott]

CsWin32 generates APIs that follow the same Win32 error reporting standard that you might have in manually written P/Invokes. You should refer to the documentation of the individual win32 API to learn how to get error information. Some APIs call SetLastError while others do not. You should only call GetLastWin32Error directly after a call to a win32 API that is documented as calling SetLastError and should only do so when it says you should (e.g. when you get a null result).
The reason for this is if you call an API that does not call SetLastError (either because it never does, or only does in error cases), then by calling GetLastWin32Error you'll be getting the code from some prior call to SetLastError that may be unrelated to the function you just invoked.

[netcorefan1]

Many thanks for your help. That's all I needed to know. It should be straightforward to adapt my old error manager handler for CsWin32. Just wanted to be sure there was no CsWin32ErrorManager available (which would have been for sure a better choice).
Thanks for reminding me about SetLastError!
Thanks

[0x5bfa]

Is there enum for Win32 erro like Win32Error.ERROR_ACCESS_DENIED?

[AArnott]

Yes. The enum is called WIN32_ERROR.