我希望有人能够帮助我解决一个我正在开发的应用程序的问题,该应用程序利用JMF媒体库中的Java摄像头。Java Webcam GUI应用程序
我遇到的问题是,我可以自己用这个类在这里
import java.awt.BorderLayout;
import java.util.Vector;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Player;
import javax.media.control.FormatControl;
import javax.swing.JFrame;
import javax.swing.JButton;
public class WebcamClass{
CaptureDeviceInfo cam;
MediaLocator locator;
Player player;
FormatControl formatControl;
public WebcamClass(){
try{
// List out available Devices to Capture Video.
Vector<CaptureDeviceInfo> list = CaptureDeviceManager.getDeviceList (null);
System.out.println(list);
// Iterating list
for(CaptureDeviceInfo temp : list){
// Checking whether the current device supports VfW
// VfW = Video for Windows
if(temp.getName().startsWith("vfw:"))
{
System.out.println("Found : "+temp.getName().substring(4));
// Selecting the very first device that supports VfW
cam = temp;
System.out.println("Selected : "+cam.getName().substring(4));
break;
}
}
System.out.println("Put it on work!...");
// Getting the MediaLocator for Selected device.
// MediaLocator describes the location of media content
locator = cam.getLocator();
if(locator != null){
// Create a Player for Media Located by MediaLocator
player = Manager.createRealizedPlayer(locator);
if(player != null){
// Starting the player
player.start();
// Creating a Frame to display Video
JFrame f = new JFrame();
f.setTitle("Test Webcam");
f.setLayout(new BorderLayout());
// Adding the Visual Component to display Video captured by Player
// from URL provided by MediaLocator
f.add(player.getVisualComponent(), BorderLayout.CENTER);
f.pack();
f.setVisible(true);
}
}
}catch(Exception e){
System.out.println(e);
}
}
}
运行的应用程序的网络摄像头确定然而,当我把它放到我的GUI应用程序,我想运行它我不断得到“线程中的异常”AWT-EventQueue-0“java.lang.NullPointerException”当我按下按钮打开相机。
我知道它不是拿起摄像头设备,但我不明白为什么,因为它不会尝试将它嵌入到我的GUI中。
我的库文件夹中也有JMF.jar。
任何帮助将不胜感激。