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我測試了一個程序，該程序根據LTI CIVIL庫從網絡攝像頭拍攝照片並每2秒保存一次。該方案的工作非常出色在Windows Vista，但是當我跑了它在Ubuntu下我得到了一個錯誤：如何讓這個LTI CIVIL示例代碼在Ubuntu下運行？
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
下面是代碼：
/*
* 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：這是幾乎相同的測試代碼，附帶LTI CIVIL，但有一些修改。
據我所知，LTI CIVIL應該在Ubuntu下運行。我怎樣才能讓這段代碼在Ubuntu下運行？
'線程中的異常「main」com.lti.civil.CaptureException：java.lang.UnsatisfiedLinkError：java.library.path'中沒有任何內容告訴你問題是什麼。它無法找到民間動態圖書館。在Ubuntu上檢查LD_LIBRARY_PATH以確保.so文件被正確拾取。 – arunkumar
對不起，我在ubuntu的知識是有限的。我應該如何找到LD_LIBRARY_PATH？我搜索它，我什麼也沒找到 –
我想在Ubuntu上運行lti-civil代碼。我面臨同樣的問題。爲了解決這個問題，我將所需的libcivil.so文件放在我的項目根目錄下，並安裝了libstdC++。so.5（sudo apt-get install libstdC++ 5）。我能夠運行的代碼，但我得到以下錯誤：打開V4L2設備 找到集成網絡攝像頭卡uvcvideo V4L2驅動 discover_inputs（） 找到來源：1 \t 0 - 照相機1（2） 未知或不支持的格式：1448695129 – vaibhav