Calling CreateProcessAsUser from C#

Question

I\'ve been attempting to create a new process under the context of a specific user using the CreateProcessAsUser function of the Windows API, but seem to be run

Answer 1

Ahh... seems liker I've been caught out by one of the biggest gotchas in WinAPI interop programming. Also, Posting the code for my function declarations would have been a wise idea in this case.

Anyway, all that I needed to do was add an argument to the DllImport attribute of the function specifying CharSet = CharSet.Unicode. This did the trick for both the CreateProcessWithLogonW and CreateProcessWithTokenW functions. I guess it finally just hit me that the W suffix of the function names referred to Unicode and that I needed to explicitly specify this in C#! Here are the correct function declarations in case anyone is interested:

[DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool CreateProcessWithLogonW(string principal, string authority,
    string password, LogonFlags logonFlags, string appName, string cmdLine,
    CreationFlags creationFlags, IntPtr environmentBlock, string currentDirectory,
    ref STARTUPINFO startupInfo, out PROCESS_INFORMATION processInfo);

[DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true)]
public static extern bool CreateProcessWithTokenW(IntPtr hToken, LogonFlags dwLogonFlags,
    string lpApplicationName, string lpCommandLine, CreationFlags dwCreationFlags,
    IntPtr lpEnvironment, string lpCurrentDirectory, [In] ref STARTUPINFO lpStartupInfo,
    out PROCESS_INFORMATION lpProcessInformation);