Usually, there is no need to use Win32 API to start an asynchronous I/O operation. The .NET base class library has many APIs that are comfortable to use, and leverage asynchronous I/O. The following code is not intended to be used in a production software, it just shows how such an API can be written in case you do not have it in the .NET Framework.
First, we need to allow an unsafe code in our project. The setting is inside the project properties of the Build section as shown in the following screenshot:
Here, we need to define many data structures for the API function calls. The fully working code can be found in the BindHandle sample project. In this book, we will skip the unimportant details.
First, we need to use P/Invoke for two Windows API functions:
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Auto)]
public static extern SafeFileHandle CreateFile(
string lpFileName,
EFileAccess dwDesiredAccess,
EFileShare dwShareMode,
IntPtr...