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For a project i am looking for a simple database which is written in C (or C++) for a cross platform aplication.
After looking into HamsterDB (which looked promissing) i had found out, that it is dependen on boost on windows.
So the alternative should not relies on STL or other libraries as the Application will be run on different Eco Systems (like arduino,symbian,android,windows) and compiled on diferent IDEs.
It will store up ton 20mil keys(but usualy below 50k keys), IO will be low.
Therefor it should be as clean C (or C++) as possible.
Can somebody show me something which will fullfill this, ready made?
LevelDB is what you're looking for. It's written in C++ but C functions are available as well.
LevelDB is a fast key-value storage library written at Google that provides
an ordered mapping from string keys to string values.
Looks like Berkeley DB is an option to you. Not sure about the embedded part (especially for arduino).
You can find a complete tutorial at standford's classes.
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I am looking for a free C++ conditional random field (CRF) implementation but not for text processing.
There are bunch of cool implementations:
CRFsuite (for text processing)
CRF++ (for text processing)
JGMT (Matlab - MEX not C++)
There are other packages like Darwin and HCRF with no usage examples in C++.
I'm wondering if anybody know any C++ CRF library other than what I mentioned above or know any example on how to setup and use Darwin or HCRF?
DGM is a very poserful but simple-to use CRF library, written on C++11. It was designed especially for image processing and includes many usage examples in tutorials.
It also includes the DenseCRF, mentioned in other answer.
DenseCRF is a great library that performs dense conditional random field (fully-connected CRF) very efficiently. The package comes with an easy to understand C++ demo and some examples. It is very fast and produces promising results on image data.
There is DGM C++ library implementing CRFs for image classification: http://research.project-10.de/dgm
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I have to read/write the excel file in C++. I searched in net I found may library file which provides the functionality to parse the Excel sheet but those library are not opensource.
Can any one let me know the easiest way to read/write excel file in c++.
If you suggest and predefine library then it should be free of cost.
Several routes:
If you're parsing character separated value files, then you can use simple iostreaming.
Develop an XLL. Download the Excel SDK and go from there. The framework example in that SDK is pretty good.
Use the COM interface. For this you'll need something like Microsoft's ATL. Low level COM, though possible, is difficult.
Use Apache POI and a JNI / JNA layer to it.
(4) has the advantage that excel doesn't need to be installed so can run well server-side, but it will require Java. (3) is a learning curve if you haven't used COM in C++ before. Budget 6 months of mental fog.
In the absence of any more information, I'd plump for (2). The XLL interface is extremely good.
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I am writing an application in which I need to be able to browse for an existing file and to create a new one. I need to create user interface for that. Is there any good cross-platform free library to help me do that?
If you're not already using a cross-platform UI library, then it doesn't make a lot of sense to introduce a dependency upon a huge library just to display a file dialog.
Since recommendations for a cross-platform UI library have already been hashed out repeatedly in other questions (use the search feature to find them if you're interested) and are probably off-topic anyway,
I'm going to take the liberty of assuming that such is not your question.
Therefore, the answer is that no, there is no reliable, cross-platform way of creating a file dialog. Each platform provides a different interface/API for this, so you'll need to write code to detect the current platform and then display the dialog as instructed by each platform's documentation.
You can do this either at run-time (if you want to have a single binary), or at compile-time by using conditional compilation (#if statements).
This is basically all that any UI library would be doing, and for such a simple requirement (a single feature) it makes sense to me at least to just do that work yourself.
You can give wxWidgets a try, a GUI library in C++, free, open-source,... and work with the native graphics libraries.
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Can anyone point out a good C++ library that can do 2D numerical integration. It needs to be able to accept a 2D array of known values, and the spacing between the points can be assumed to be constant (for a start).
It is preferable that it have a license which allows modifying the code as needed.
It's actually a C library, but if the GPL licensing terms work for you try:
http://www.gnu.org/software/gsl/
You will want to check out the Monte Carlo integration options outlined here:
http://www.gnu.org/software/gsl/manual/html_node/Monte-Carlo-Integration.html
This Fortran library is easy to link to from C++ and is in public domain:
http://gams.nist.gov/cgi-bin/serve.cgi/Module/CMLIB/ADAPT/2967
It's single precision but it's quite easy to modify the sources (get "full sources" and go through every function) to switch to double precision.
http://itpp.sourceforge.net/current/
Try this. It can do what you ask for and more! And you can modify the code as much as you like.
I've read somewhere that you can extract libraries out of GNU Octave's code and use the C++ code in your own applications. I'm not sure if that's an easy task, but you can give it a try if you have the time.
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What's an easy to use SNMP client library for c++?
SNMP++ is also a nice and open source library for C++ developers.
http://www.agentpp.com/api/cpp/snmp_pp.html
Probably the best choice is net-snmp. Note that the library has "C" linkage but will work just fine with C++.
I have found that Net-SNMP does not support multi-threading with v3 type queries. So if you are writing an SNMP monitoring tool that will be polling multiple hosts then you will need to take this into consideration.
OpenSNMP contains a complete multi-threaded implementation of SNMPv3 that is done in C++ (complete with classes, etc). It's not heavily used and maintained though.
Net-SNMP with v3 over TLS/DTLS is likely to be threadsafe as it's really SNMPv3/USM that contains threading issues. I think.