PInvoking stdin, stdout and stderr to unmanaged dll

Question

I have a C header file that contains something like this:

void init(FILE* in, FILE* out, FILE* err);

I'm guessing this equates to the following PInvoke signature:

[DllImportAttribute("mylib", EntryPoint = "init")]
public static extern void init(IntPtr @in, IntPtr @out, IntPtr err);

Incidentally, I want to invoke this method. Can I get the IntPtr from Console.In, Console.Out, Console.Error somehow?

It should work on Linux and Windows, and not Windows exclusively.

Not duplicate. Needs to work on Linux as well. – HelloWorld Jun 24 '19 at 08:02 — HelloWorld, Jun 24 '19 at 08:02

score 1 · Accepted Answer · answered Jun 23 '19 at 14:21

1

You can use GetStdHandle to obtain handles to the standart input(STD_INPUT_HANDLE), output(STD_OUTPUT_HANDLE) and error(STD_ERROR_HANDLE) file.

You can then write and read from those files using WriteFile, ReadFile functions.

After that, if you still need a FILE structure, follow these steps to create one.

answered Jun 23 '19 at 14:21

Gurhan Polat

Should have mentioned it, but I'm working on Linux. Nevertheless, I'll mark it as correct :) – HelloWorld Jun 24 '19 at 08:01
Thanks for your response :), So actually in linux, you can use fdopen to obtain a FILE structure for a file descriptor. `FILE *f = fdopen(STDOUT_FILENO, "w");` – Gurhan Polat Jun 24 '19 at 09:53

1 Answers1