Pass Multiple Process Creation flags to CreateProcess

Question

I am using CreateProcess and I would like to pass CREATE_SUSPENDED and CREATE_NO_WINDOW as the Process Creation Flags.

This is my pinvoke signature:

[DllImport("kernel32.dll", SetLastError = true)]
private static extern Boolean CreateProcess(String lpApplicationName, String lpCommandLine, IntPtr lpProcessAttributes, IntPtr lpThreadAttributes,
            Boolean bInheritHandles, UInt32 dwCreationFlags, IntPtr lpEnvironment, String lpCurrentDirectory, Byte[] lpStartupInfo,
            out PROCESS_INFORMATION lpProcessInfo);

The question is: How to pass multiple flags?

Answer 1

Since all the flags have a single 1 in a single binary position, you can combine them together by OR-ing or by adding them together:

CREATE_SUSPENDED | CREATE_NO_WINDOW

Here is how it works:

CREATE_NO_WINDOW  is 0x08000000
CREATE_SUSPENDED  is 0x00000004

The result of OR-ing them together is 0x08000004.