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C API?

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	C API? by Camilo Rostoker :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Hi, Is there a C API for RRDtool? I read the thread from back in Feb 2006 about the update/creation of a C API (http://www.mail-archive.com/rrd-developers@.../msg01664.html), but I can't seem to find anything else about it. I'm looking to mainly use the C API for storing data, and would likely use one of the Perl or other API's for retrieving/displaying the data. Any help/suggestions is greatly appreciated. Cheers, Camilo _______________________________________________ rrd-users mailing list rrd-users@... https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
	Re: C API? by henrik-rrdusers :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message On Tue, Feb 06, 2007 at 11:02:45AM -0800, Camilo Rostoker wrote: > Is there a C API for RRDtool? I read the thread from back in Feb 2006 > about the update/creation of a C API > (http://www.mail-archive.com/rrd-developers@.../msg01664.html), > but I can't seem to find anything else about it. There is an API - it's specified in the "rrd.h" file - but it isn't really documented anywhere. I found the easiest way of learning this API was to look at the source for the "rrdtool" program. The functions use more or less the same parameters as the commandline utilities. If it's of any help, you can see how I use the RRDtool API to create and update RRD files. My project is the "Hobbit Monitor" on http://hobbitmon.sourceforge.net/ - you can browse the source at http://www.hswn.dk/beta/snapshot/ . The RRD create/update happens in http://www.hswn.dk/beta/snapshot/hobbitd/do_rrd.c Regards, Henrik _______________________________________________ rrd-users mailing list rrd-users@... https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
	Re: C API? by Mark Easton :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message >There is an API - it's specified in the "rrd.h" file - but it isn't >really documented anywhere. Many thanks for your post Henrik! I am interfacing to phidgets (www.phidgets.com) so need to write a program in c to receive data from these phidgets and update into RRDTool. Anyone can help me with building RRDTool on Windows XP with VS .NET 2005??
	Re: C API? by Mark Easton :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Ok - I have built and produced an rrd.lib wit VS.NET 2005. No idea if it will work. I am wanting now to produce a small c app that uses this, so I guess I will include rrd.h and use your go_rrd.c and go from there. Any pointers? Ta mark
	Re: C API? by Travis Spencer :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message On 2/6/07, Mark Easton <mark.easton@...> wrote: > Gosh the C api is a closely guarded secret it seems. I wouldn't say that. Almost everything that you need to know is at http://oss.oetiker.ch/rrdtool/doc/index.en.html. The only real secrets have been discussed on this and the developer list before. This is what I've picked up: 1. Free any double pointers you pass into RRD upon success 2. Lock other threads out before calling any of RRD's function if you're running in a multithreaded environment and calling a non-reentrant version of an RRD function 3. Clear optint, opterr, and call rrd_clear_error before invoking an RRD function 4. All RRD functions return a non-zero value on failure and zero upon success. 5. You can call rrd_test_error to find out more when something goes wrong. 6 Ask here if you get stuck ;-) Did I miss any? See https://lists.oetiker.ch/pipermail/rrd-developers/2006-July/001729.html for a few more details. Also, I would suggest that you subscribe to the lists with a gmail account or something, so you can search them easily. (That's what I do anyway.) Happy hacking, Mark. -- Regards, Travis Spencer _______________________________________________ rrd-users mailing list rrd-users@... https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
	Re: C API? by Mark Easton :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Cool, thanks Travis, Yes I have worked out all of this. I am pleased now it is working - so now am just learning how to use the various rrdtool methods. Cheers Mark Travis Spencer wrote: On 2/6/07, Mark Easton <mark.easton@azurebell.co.nz> wrote: > Gosh the C api is a closely guarded secret it seems. I wouldn't say that. Almost everything that you need to know is at http://oss.oetiker.ch/rrdtool/doc/index.en.html. The only real secrets have been discussed on this and the developer list before. This is what I've picked up: 1. Free any double pointers you pass into RRD upon success 2. Lock other threads out before calling any of RRD's function if you're running in a multithreaded environment and calling a non-reentrant version of an RRD function 3. Clear optint, opterr, and call rrd_clear_error before invoking an RRD function 4. All RRD functions return a non-zero value on failure and zero upon success. 5. You can call rrd_test_error to find out more when something goes wrong. 6 Ask here if you get stuck ;-) Did I miss any? See https://lists.oetiker.ch/pipermail/rrd-developers/2006-July/001729.html for a few more details. Also, I would suggest that you subscribe to the lists with a gmail account or something, so you can search them easily. (That's what I do anyway.) Happy hacking, Mark. -- Regards, Travis Spencer _______________________________________________ rrd-users mailing list rrd-users@lists.oetiker.ch https://lists.oetiker.ch/cgi-bin/listinfo/rrd-users
	Re: C API? by steven765 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Mark or anyone Are there any pre-build visual studio solutions out there? Or one you might be willing to share? Mark Easton wrote: Ok - I have built and produced an rrd.lib wit VS.NET 2005. No idea if it will work. I am wanting now to produce a small c app that uses this, so I guess I will include rrd.h and use your go_rrd.c and go from there. Any pointers? Ta mark
	Re: C API? by Mark Easton :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Yes my build works partially. The only things I need to fix and am doing at the moment is that some of the wrapper c code which I used from the rrdtool website is outdated and so the parameter counts of some methods have changed, but the main methods work. You can download my VS.NET 2005 solution (..\rrdtool-1.2.19\win32\rrdtool.sln) which builds and saves the exe to ..\rrdtool-1.2.19\win32\tooldebug. Download from : www.agile4.co.nz/downloads/rrdtool-1.2.19.rar, and www.agile4.co.nz/downloads/GnuWin32.rar (... to get the gnuwin32.rar files included in the build. This is installed on my machine in C:\Program Files\GnuWin32.) Good luck, Mark
	Re: C API? by steven765 :: Rate this Message: Reply to Author \| View Threaded \| Show Only this Message Mark Easton wrote: Yes my build works partially. The only things I need to fix and am doing at the moment is that some of the wrapper c code which I used from the rrdtool website is outdated and so the parameter counts of some methods have changed, but the main methods work. You can download my VS.NET 2005 solution (..\rrdtool-1.2.19\win32\rrdtool.sln) which builds and saves the exe to ..\rrdtool-1.2.19\win32\tooldebug. Download from : www.agile4.co.nz/downloads/rrdtool-1.2.19.rar, and www.agile4.co.nz/downloads/GnuWin32.rar (... to get the gnuwin32.rar files included in the build. This is installed on my machine in C:\Program Files\GnuWin32.) Good luck, Mark Okay got it working except the wrap_rrdgraph function. Any luck here? I've tried various things. Now it doesn't crash, but no picture is output either. i modified it to read ret_2 = wrap_rrd_graph( "speed.png --start 920804400 --end 920808000 -h 200 -w 400 DEF:data=test.rrd:AVERAGE LINE:data#FF0000");