我测试了一个程序，该程序基于LTI CIVIL库从网络摄像头拍摄照片，并每2秒保存一次。该程序在Windows Vista下运行良好，但是在Ubuntu下运行时出现错误：
run:
Exception in thread "main" com.lti.civil.CaptureException:java.lang.UnsatisfiedLinkError: no civil in java.library.path
at com.lti.civil.impl.jni.NativeCaptureSystemFactory.createCaptureSystem(NativeCaptureSystemFactory.java:24)
at emptyroomoperation_final.Camera.main(Camera.java:41)
Caused by: java.lang.UnsatisfiedLinkError: no civil in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1734)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1028)
at com.lti.civil.impl.jni.NativeCaptureSystemFactory.createCaptureSystem(NativeCaptureSystemFactory.java:21)
... 1 more
Java Result: 1
这是代码：
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package emptyroomoperation_final;
import java.awt.image.BufferedImage;
import java.io.FileOutputStream;
import java.util.List;
import com.lti.civil.CaptureDeviceInfo;
import com.lti.civil.CaptureException;
import com.lti.civil.CaptureObserver;
import com.lti.civil.CaptureStream;
import com.lti.civil.CaptureSystem;
import com.lti.civil.CaptureSystemFactory;
import com.lti.civil.DefaultCaptureSystemFactorySingleton;
import com.lti.civil.Image;
import com.lti.civil.VideoFormat;
import com.lti.civil.awt.AWTImageConverter;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import java.io.File;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
*
* @author Ken Larson
*/
public class Camera
{
static public String s;
static int w=0;
//static File f1 = new File("C:\\Users\\mostafa\\Documents\\NetBeansProjects \\EmptyRoomOperation\\0.jpg") ;
// static File f2 = new File("C:\\Users\\mostafa\\Documents\\NetBeansProjects\\EmptyRoomOperation\\") ;
public static void main(String[] args) throws CaptureException
{
CaptureSystemFactory factory = DefaultCaptureSystemFactorySingleton.instance();
CaptureSystem system = factory.createCaptureSystem();
system.init();
List list = system.getCaptureDeviceInfoList();
for (int i = 0; i < list.size(); ++i)
{
CaptureDeviceInfo info = (CaptureDeviceInfo) list.get(i);
System.out.println("Device ID " + i + ": " + info.getDeviceID());
System.out.println("Description " + i + ": " + info.getDescription());
CaptureStream captureStream = system.openCaptureDeviceStream(info.getDeviceID());
System.out.println("Current format " + videoFormatToString(captureStream.getVideoFormat()));
captureStream.setObserver(new MyCaptureObserver());
System.out.println("Available formats:");
for (VideoFormat format : captureStream.enumVideoFormats())
{
System.out.println(" " + videoFormatToString(format));
}
final int MAX_FORMATS = 2;
int count = 0;
//for (VideoFormat format : captureStream.enumVideoFormats())//not now
VideoFormat format = captureStream.enumVideoFormats().get(0);//alternative of the above
int k=0;
while(k!=10)
{
/*if (count > MAX_FORMATS)
{ System.out.println("Stopping after " + MAX_FORMATS + " formats."); // could be a lot
break;
}*/
System.out.println("Choosing format: " + videoFormatToString(format));
captureStream.setVideoFormat(format);
s = new String(""+w);
// File f2 = new File("C:\\Users\\mostafa\\Documents\\NetBeansProjects\\EmptyRoomOperation\\"+s+".jpg") ;
// f1.
System.out.println("Capturing for 2 seconds...");
captureStream.start();
try
{
Thread.sleep(2000);
}
catch (InterruptedException e)
{
return;
}
captureStream.stop();
/*try {
// Thread.sleep(10000);
} catch (Exception ex) {
Logger.getLogger(Camera.class.getName()).log(Level.SEVERE, null, ex);
}*/
//++count;
w++;
}
System.out.println("disposing stream...");
captureStream.dispose();
}
System.out.println("disposing system...");
system.dispose();
System.out.println("done.");
}
public static String videoFormatToString(VideoFormat f)
{
return "Type=" + formatTypeToString(f.getFormatType()) + " Width=" + f.getWidth() + " Height=" + f.getHeight() + " FPS=" + f.getFPS();
}
private static String formatTypeToString(int f)
{
switch (f)
{
case VideoFormat.RGB24:
return "RGB24";
case VideoFormat.RGB32:
return "RGB32";
default:
return "" + f + " (unknown)";
}
}
}
class MyCaptureObserver implements CaptureObserver
{
public void onError(CaptureStream sender, CaptureException e)
{ System.err.println("onError " + sender);
e.printStackTrace();
}
public void onNewImage(CaptureStream sender, Image image)
{
final BufferedImage bimg;
try
{
final VideoFormat format = image.getFormat();
System.out.println("onNewImage format=" + Camera.videoFormatToString(format) + " length=" + image.getBytes().length);
bimg = AWTImageConverter.toBufferedImage(image);
}
catch (Exception e)
{ e.printStackTrace();
return;
}
// Encode as a JPEG
try
{
FileOutputStream fos = new FileOutputStream(Camera.s+".jpg");
JPEGImageEncoder jpeg = JPEGCodec.createJPEGEncoder(fos);
jpeg.encode(bimg);
fos.close();
}
catch (Exception e)
{
e.printStackTrace();
}
}
}
注意：这几乎与LTI CIVIL附带的测试代码相同，但是进行了一些修改。
据我了解，LTI CIVIL应该也可以在Ubuntu下运行。我如何让这段代码在Ubuntu下运行？
最佳答案
下载并查看文件后，看起来您想要的文件位于lti-civil / native目录中。根据您的linux版本，有linux-amd64和linux-x86。现在，您可以通过两种方式使用LD_LIBRARY_PATH来做事：环境变量，您可以将其设置为指向您希望linux搜索动态库的目录。
推荐的另一种方法是执行以下操作。创建/etc/ld.so.conf.d/civil.conf。该文件应与您解压缩或提取lti-civil / native / linux-xxx / lib * .so文件的路径的路径只有一行。您将需要root访问权限或sudo访问权限才能执行此操作。如果您没有访问权限，则将LD_LIBRARY_PATH设置为lti-civil / native / ....，它应该可以工作。
关于java - 我如何才能使此LTI CIVIL示例代码在Ubuntu下运行？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/7713067/