custom logging system

[aargh]

Hi

Is there any way to redirect unigine logs to our own logging system? I need to create unified logging.
So, the ideal would be something like a registration log handler or functor.

                                                                                                                 thank you  Aargh

[morbid]

Hello aargh,

May I ask you to elaborate on this? How do you see a final result? As a new log file where you can see all UNIGINE log messages and messages from your application?

Thanks.

[aargh]

Hi Morbid

Yes that is the target state. Our app is already using its log system, and it would be perfect if we could even connect unigine logging to it.

As I wrote above, something like redirecting logs would be ideal.

                                                                                                                                aargh

Edited May 24, 2019 by aargh

[morbid]

You can add a callback for any message and implement desired logic for custom console or log file: https://developer.unigine.com/en/docs/2.8/api/library/engine/class.console?rlang=cpp#addOutputCallback_OutputCallback_void_ptr

Thanks!

[aargh]

1 hour ago, morbid said:

You can add a callback for any message and implement desired logic for custom console or log file: https://developer.unigine.com/en/docs/2.8/api/library/engine/class.console?rlang=cpp#addOutputCallback_OutputCallback_void_ptr

Thanks!

Thanks for the pointer, I'll try.

[aargh]

Hi

Thanks, it works perfectly, only it can't catch messages from engine start to the interpreter's start.

If it was similar to a callback on the Log class....   ;-)

                                                                                                                    aargh

[morbid]

Do you need this info as well?

[aargh]

On 5/27/2019 at 10:06 AM, morbid said:

Do you need this info as well?

Yes it would be useful

[morbid]

I've checked with the engine team. You can't get these messages (from engine start to the interpreter's start) with standard API. In theory, you can take them through stdout, but it will require some extra effort from your side.

Thanks.

[aargh]

Hi

Extra effort doesn't matter if there's a way to do it. Please add more details.

If I understand it correctly, it will be redirecting stdout to file or named pipe

                                                                                                          aargh

[andrey-kozlov]

Hello aargh,

Yes, stdout can be redirected to file or pipe. There's nothing Unigine specific here. This snippet seems to be working for Windows:

#include <windows.h>
#include <io.h>
#include <functional>
#include <iostream>

#define STDOUT_FILENO 1
#define STDERR_FILENO 2

enum StdHandleToRedirect
{
	STDOUT, STDERR
};

class StdRedirect
{
public:
	/// Assumes the specified handle is still assigned to the default FILENO (STDOUT_FILENO/STDERR_FILENO)
	/// TODO allow redirection in every case
	/// callback will run in a new thread and will be notified of any character input to
	/// the specified std handle
	StdRedirect(StdHandleToRedirect h, std::function<void(char)> callback): callback(callback)
	{
		CreatePipe(&readablePipeEnd, &writablePipeEnd, 0, 0);
		SetStdHandle(h == STDOUT ? STD_OUTPUT_HANDLE : STD_ERROR_HANDLE, writablePipeEnd);

		// Redirect (TODO: ERROR CHECKING)
		int writablePipeEndFileStream = _open_osfhandle((long)writablePipeEnd, 0);
		FILE *writablePipeEndFile = NULL;
		writablePipeEndFile = _fdopen(writablePipeEndFileStream, "wt");
		_dup2(_fileno(writablePipeEndFile), h == STDOUT ? STDOUT_FILENO : STDERR_FILENO);

		CreateThread(0, 0, (LPTHREAD_START_ROUTINE)stdreader, this, 0, 0);
	}

	// TODO implement destructor, cleanup, reset

private:
	// DWORD (WINAPI *PTHREAD_START_ROUTINE)(LPVOID lpThreadParameter)
	static void WINAPI stdreader(StdRedirect *redirector)
	{
		while (1)
		{
			char c;
			DWORD read;
			::fflush(NULL); // force current stdout to become readable
			// TODO add error handling
			ReadFile(redirector->readablePipeEnd, (void *)& c, 1, &read, 0); // this blocks until input is available
			if (read == 1)
				redirector->callback(c);
		}
	}

	HANDLE readablePipeEnd, writablePipeEnd;
	const std::function<void(char)> callback;
};

Unigine::String buf;
std::function<void(char)> toOutputDebugString = [&](char x)
{
	buf.append(x);
};
StdRedirect so(STDOUT, toOutputDebugString);
StdRedirect se(STDERR, toOutputDebugString);

 

[aargh]

Hi

Thank you. This is fantastic reply.

                                                 aargh