Question

每次运行时我都会遇到这些错误我认为我如何附加SWT的方式存在问题如何应用它

javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1301)
at test_guiiii.gui_rec.image_resize(gui_rec.java:160)
at test_guiiii.gui_rec$2.widgetSelected(gui_rec.java:117)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4230)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1491)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1514)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1499)
at org.eclipse.swt.widgets.Widget.notifyListeners(Widget.java:1299)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4072)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3698)
at test_guiiii.gui_rec.open(gui_rec.java:57)
at test_guiiii.gui_rec.main(gui_rec.java:42)

每次我按下错误时都尝试调试我收到了类似的消息：

这是主类的完整代码：

package test_guiiii;

import org.eclipse.swt.widgets.Display; 
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.graphics.Image;

import java.awt.Graphics2D;
//import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Text;

import test_guiiii.Rec_det;
import org.eclipse.wb.swt.SWTResourceManager;

public class gui_rec {
//private static JFileChooser jfc = new JFileChooser();
protected Shell shlGui;
Display display = Display.getDefault();
String file_path= null;
String file_name = null;
private Text txt_open;
/**
 * Launch the application.
 * @param args
 */
public static void main(String[] args) {
    try {
        gui_rec window = new gui_rec();
        window.open();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

/**
 * Open the window.
 */
public void open() {
    //Display display = Display.getDefault();
    createContents();
    shlGui.open();
    shlGui.layout();
    while (!shlGui.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
}

/**
 * Create contents of the window.
 */
protected void createContents() {
    shlGui = new Shell(display, SWT.CLOSE | SWT.TITLE | SWT.MIN );
    shlGui.setBackground(SWTResourceManager.getColor(SWT.COLOR_DARK_GRAY));
    shlGui.setSize(945, 566);

    //shell.setMaximized(true);

    shlGui.setText("Graphical User Interface");
    //scrolledComposite.setMinSize(lbl_Image.computeSize(SWT.DEFAULT, SWT.DEFAULT));
    Label lbl_image = new Label(shlGui, SWT.BORDER | SWT.CENTER);
    lbl_image.setBackground(SWTResourceManager.getColor(SWT.COLOR_GRAY));
    lbl_image.setBounds(10, 10, 361, 465);

    txt_open = new Text(shlGui, SWT.BORDER);
    txt_open.setBounds(93, 493, 278, 25);
    txt_open.setEditable(false);



    Label lbl_rec = new Label(shlGui, SWT.BORDER | SWT.CENTER);
    lbl_rec.setBackground(SWTResourceManager.getColor(SWT.COLOR_GRAY));
    lbl_rec.setBounds(408, 10, 361, 465);

    Button btnNewButton = new Button(shlGui, SWT.NONE);
    btnNewButton.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            Rec_det detect = new Rec_det();
            detect.det(file_path);
            image_resize(lbl_image, "result_new.jpg");                                  

            lbl_rec.setImage(new Image(display, "saved.png"));;
        }
    });
    btnNewButton.setBounds(530, 493, 112, 25);
    btnNewButton.setText("initiate recognition");

    Button btnOpen = new Button(shlGui, SWT.NONE);
    btnOpen.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {

            FileDialog dlg = new FileDialog(shlGui, SWT.MULTI);

            String fn = dlg.open();
            if (fn != null) {
                txt_open.setText(dlg.getFilterPath());
                file_name = dlg.getFileName();
                file_path = dlg.getFilterPath();
                file_path = file_path+'\\'+file_name;
                //System.out.println(file_path);
                image_resize(lbl_image,file_path);                                  

                lbl_image.setImage(new Image(display, "saved.png"));;
            }

        }
    });

    btnOpen.setBounds(10, 493, 75, 25);
    btnOpen.setText("Open");

    Button btnOpenInNew = new Button(shlGui, SWT.NONE);
    btnOpenInNew.addSelectionListener(new SelectionAdapter() {
        @Override
        public void widgetSelected(SelectionEvent e) {
            BufferedImage img;
            try {
                img = ImageIO.read(new File("result_new.jpg"));
                image_Open_nw nw = new image_Open_nw();
                nw.Mouse(img);
            } catch (IOException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

        }
    });
    btnOpenInNew.setBounds(788, 93, 141, 25);
    btnOpenInNew.setText("Open in new window");

    Label lblToViewThe = new Label(shlGui, SWT.NONE);
    lblToViewThe.setAlignment(SWT.CENTER);
    lblToViewThe.setBackground(SWTResourceManager.getColor(SWT.COLOR_DARK_GRAY));
    lblToViewThe.setForeground(SWTResourceManager.getColor(SWT.COLOR_RED));
    lblToViewThe.setBounds(788, 11, 141, 65);
    lblToViewThe.setText("To view the output image\r\nof the Recognition process\r\nmore clearly and for the \r\npost processing ");


}

protected void image_resize( Label lbl_image, String file_path){

    try {
         BufferedImage img1 = ImageIO.read(new File(file_path));

        int h = img1.getHeight(null);
        int w = img1.getWidth(null);

        int temp=0,temp1 = 0;

        for(int i=1; i< 100; i++){

             temp = h/i;
             temp1 = w/i;
             //System.out.println(temp);
             if(temp < lbl_image.getSize().y && temp1 < lbl_image.getSize().x){
                 i = 102;
             }

         }

       BufferedImage resizedImg = new BufferedImage(temp1, temp, BufferedImage.TRANSLUCENT);
       Graphics2D g2 = resizedImg.createGraphics();
       g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
       g2.drawImage(img1, 0, 0,temp1, temp, null);
       g2.dispose();

        File outputfile = new File("saved.png");
        ImageIO.write(resizedImg, "png", outputfile); 

    } catch (IOException e2) {
        // TODO Auto-generated catch block
        e2.printStackTrace();
    }
}
}

如何正确应用SWT库？

0 个答案: