I'm using JNI in Android development. I want to know where do the compiler find the referenced .h files?
Here in jni/jni_part.cpp, it includs lots of .h files. Opencv related files are defined by the SDK, but the "cartoon.h" is sure to be a project-specified header. But I cannot find it in the project folder. Then do the eclipse compile the JNI c++ code at every run? If so , in which directories does the eclipse find these headers?
Maybe it's basic for JNI but I'm not familiar with it. So plz help me out with one or two sentences. Or you could just paste a simple tutorial for JNI in Android, eclipse.
#include <jni.h>
#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/features2d/features2d.hpp>
#include "cartoon.h"
#include "ImageUtils.h" // Handy functions for debugging OpenCV images, by Shervin Emami.
using namespace std;
using namespace cv;
extern "C" {
.....
This is my eclipse project folder structure
/project
/jni
jni_part.cpp
/src
something.java
You'll need to start using android-ndk to compile the .c, .cpp files to a .so library object, which you can then use in your android project.
Please refer to the Android NDK to get started.
http://developer.android.com/tools/sdk/ndk/index.html#GetStarted
you can find examples in the NDK download.
If Eclipse "knows" where cartoon.h file is on disk, it will help you find it - put the cursor on that #include line and press F3.
Regarding your other question: Eclipse compiles only if the relevant files (sources, headers, or mk) change.
Related
I'm just wondering why SDL1 is saved under standard emscripten path \emsdk-master\upstream\emscripten\system\include but SDL2 during first compilation with USE_SDL=2 under
\user\.emscripten_ports\sdl2\SDL2-version_20\include? This also leads to an faulty includepath #include <SDL2/SDL.h> in Visual Studio Code for Intellisense.
I wish to run a C Code in android for which I am using android ndk. I also need to add some libraries. While building these libraries, I am getting errors because of the extern statements in the header files. Eclipse IDE shows syntax errors. I also unchecked everything at Project-->Properties--> C/C++ Code Analysis.
Similar example is shown here. How to resolve this?
#ifdef __cplusplus
extern "C" {
#endif
Hi guys I am creating a simple game using cocos2d-x and blackberry. I need some place to store my game settings, something similar to shared preferences in ios and android. I found some code using qsettings, but the problem is I am not able to add the QtCore library.
I add the library using RightClick->configure->add Library and Standard BlackBerry Platform Library. The library gets added successfully.
#include "dataProcessor.h"
#include <QtCore>
void dataProcessor::setup(){
QDir dir;
dir.mkpath("data/files/text");
dir.cd("data/files/text");
}
but when I compile the above code, I get the error C:/Users/I076636/Documents/target_10_0_9_1673/qnx6/usr/include/qt4/QtCore/qatomic.h:45:28: fatal error: QtCore/qglobal.h: No such file or directory
But I noticed 2 things,
1.qglobal.h file is there inside the QtCore directory I have included.
2.inside qatomic.h if I change
#ifndef QATOMIC_H
#define QATOMIC_H
#include <QtCore/qglobal.h>
#include <QtCore/qbasicatomic.h>
into
#ifndef QATOMIC_H
#define QATOMIC_H
#include <qglobal.h>
#include <QtCore/qbasicatomic.h>
the error for qglobal goes and now the same error comes for qbasicatomic.h.
I think it is something simple like incorrect mapping between QtCore keyword and include directory or something..
Please do have a look.
The IDE is made on eclipse.
You can understand what is going wrong if you look closely at the error message:
/target_10_0_9_1673/qnx6/usr/include/qt4/QtCore/qatomic.h:45:28:
fatal error: QtCore/qglobal.h: No such file or directory
The error isn't in your inclusion of QtCore, but is occurring inside QtCore/qatomic.h, on line 45 (you can find this file in the [YOUR BBNDK DIRECTORY]/target_10_0_9_1673/qnx6/usr/include/qt4/QtCore/qatomic.h):
#include <QtCore/qglobal.h>
qatomic.h is already in the QtCore directory, and you'll find a qglobal.h directory there as well. So what this means is that qatomic.h expects the parent directory to be on the include path, so that including <QtCore/qglobal.h> will work.
So you just need to add [YOUR BBNDK DIRECTORY]/target_10_0_9_1673/qnx6/usr/include/qt4 to your include directories.
Do it like this:
Right click over your project in Project Explorer and choose Properties
Expand the tree to C/C++ General / Paths and Symbols
Change the Configuration in the Paths and Symbols frame to [All configurations]
Click the Includes tag and select GNU C in the Languages list (or do this for every language).
Click Add... and type ${QNX_TARGET}/usr/include/qt4 and press OK
Click Add... and type ${QNX_TARGET}/usr/include/qt4/QtCore and press OK
Now your include of #include <QtCore> should work.
Next up: linking errors ;-)
It sounds like your BB10 NDK did not get installed properly, or your project wasn't set up properly. If you expand your project and the Includes you should see (along with others):
<NDK_INSTALL_LOCATION>/target_<VERSION>/qnx6/usr/include/qt4/QtCore
I'm trying to read a .mat-file in C++ with MSVS 2008 but when building a simple program I get the following error:
1>ex3.obj : error LNK2019: unresolved external symbol _matClose referenced in function _main
1>ex3.obj : error LNK2019: unresolved external symbol _matOpen referenced in function _main
I've researched Google as well and it seems that the compiler can't link to the libraries needed for using this functions (matOpen and matClose). I never used an external library before but I tried everything I found in Google to add the Matlab libraries. I did the following:
TOOLS --> Options --> Projects and Solutions --> VC++ Directories --> Show directories for: include files --> then I added the path of the matlab include directory --> C:\Program Files\MATLAB\extern\include
I did the same with the library files: C:\Program Files\MATLAB\extern\lib\win64\microsoft
I also did that for the project:
Right click on the project --> Properties --> Configuration Properties --> C/C++ --> General --> Additional Include Directories --> and added "C:\Program Files\MATLAB\extern\include\win64"
Then I did the same at Linker --> General --> Additional Library Directories --> and added "C:\Program Files\MATLAB\extern\lib\win64\microsoft"
So I really don't know where the problem is. Here is the source code I'm trying to build:
#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <mat.h>
int main(int argc, char *argv[])
{
const char *file = "mozart_part1.mat";
MATFile *pmat;
pmat = matOpen(file, "r");
if(pmat == NULL)
{
std::cout << "Error: could not open MAT-file!";
return(1);
}
matClose(pmat);
}
Can you see or guess any mistakes I made
Take a look here.
Go through the steps.
What I think you've missed is step 7:
7.Locate the .lib files for the compiler you are using under matlabroot\extern\lib\win32\microsoft or matlabroot\extern\lib\win64\microsoft. Under Linker Input properties, add libmx.lib, libmex.lib, and libmat.lib as additional dependencies.
Edit:
Both Matlab and Visual C++ should be either 32bit or 64bit. There are two options:
Find these 3 lib files from another Matlab which is 32bit. Direct your linker there instead.
Make your Visual C++ 64bit. See here how it's done.
Solution:
What eventually worked was option 2, using this link with instructions.
I solved the Problem!
#Michael Litvin: you were right! I didn't know that you have to switch MSVS 2008 to x64 platform.
As the Matlab libraries are provided as x64 binaries you have to switch your MSVS compiler to x64 as well. I followed these steps to do that: http://software.intel.com/en-us/articles/configuring-microsoft-visual-studio-for-64-bit-applications/
Thanks for you help!
I'm using ffplay in my Application. I implemented the Librarys which has been used in this Project: http://code.google.com/p/ffmpeg4iphone/downloads/detail?name=ffplay-xproj.zip&can=2&q=
But I've seen that this Sources are very old(Apr 2009). I wanted to Build new Librarys and then change it with these In my project.
What I've done:
Downloaded the ffmpeg Source code: (using command line: svn checkout svn://svn.ffmpeg.org/ffmpeg/trunk ffmpeg)
Compiled the Project with special ./configure options and the gas-processor :
http://lists.mplayerhq.hu/pipermail/ffmpeg-devel/2009-October/076618.html
I only changed here the Paths of the actual locations for the iPhone SDK 4.1
Changed the header Path in xCode Active Target Project Settings to my ffmpeg folder
Included the .a files in my project in xCode
Added the Other Linker Flags -lm -lbz2 -lz
Tried to Build my Application, but I get some Linker errors where symbol(s) wasn't found.
Undefined symbols:
"avcodec_init()", referenced from:
And the other errors are nearly the same (_av_codec.....)
How can I build it correctly?
I've found the solution: I set the architecture to Optimized(arm7) and then all was working.
One more Question: I use ffmpeg for streaming an online stream. Which Values Should I set to get a good streaming quality also when I am in 3G. This what i've done:
set the audio-buffer to 1024
set the lowres value of mpeg to 3
Not sure if you are using C or C++ (g++) compiler, but try guarding your #includes for ffmpeg with extern "C": the c++ compiler (if it is used) is probably mangling the function names and hence the link errors.
Try to enclose your include with extern "C":
#ifdef __cplusplus
extern "C" {
#endif
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#ifdef __cplusplus
}
#endif