我正在使用另一篇 StackOverflow 帖子 - Java - 如何快速截取屏幕截图中的示例代码，但我遇到了一些问题。
我从其Github 存储库下载了 JNA 文件，然后将该文件复制到 JAR 文件中，并将其放入我的程序所在的同一文件夹中。但是当我尝试编译我的程序时，它给了我很多错误，如下所示：
C:\Users\windows\Desktop\testPrintScreen>javac JNAScreenShot.java
JNAScreenShot.java:12: error: package com.sun.jna.platform.win32 does not exist
import com.sun.jna.platform.win32.W32API;
^
JNAScreenShot.java:129: error: package com.sun.jna.platform.win32 does not exist
interface GDI32 extends com.sun.jna.platform.win32.GDI32 {
^
JNAScreenShot.java:58: error: cannot find symbol
bufferedImageFromBitmap(GDI32.HDC blitDC,
^
symbol: class HDC
location: interface GDI32
JNAScreenShot.java:59: error: cannot find symbol
GDI32.HBITMAP outputBitmap,
^
symbol: class HBITMAP
location: interface GDI32
JNAScreenShot.java:60: error: cannot find symbol
GDI32.BITMAPINFO bi) {
^
symbol: class BITMAPINFO …我想在 javascript 中循环一系列图像。下面是我到目前为止的代码
<html>
<head>
</head>
<body>
<img src="images/image1.jpg" alt="rotating image" width="600" height="500" id="rotator">
<script type="text/javascript">
(function() {
var rotator = document.getElementById('rotator'); // change to match image ID
//var imageDir = 'images/'; // change to match images folder
var delayInSeconds = 1; // set number of seconds delay
// list image names
var images = ['1.jpg','2.jpg', '3.jpg', '4.jpg'];
// don't change below this line
var num = 0;
var changeImage = function() {
var len = images.length;
rotator.src = images[num++]; …我想要计算目录中有多少图像.我有一些来自互联网的代码的副本,可以检测目录中的总文件.
import java.io.*;
public class CountFilesInDirectory {
public static void main(String[] args) {
File f = new File("/home/pc3/Documents/ffmpeg_temp/");
int count = 0;
for (File file : f.listFiles()) {
if (file.isFile()) {
count++;
}
}
System.out.println("Number of files: " + count);
}
}
我希望计算一个特定的文件类型,如jpg/txt.我该怎么办？
我正在使用JFileChooser进行浏览文件类.我在编译时遇到问题.它告诉我比找不到符号actionlistener.下面是我的代码:
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.text.*;
import javax.swing.filechooser.*;
public class BrowseForFile
{
private JTextField txtFileName;
private JFrame layout;
public BrowseForFile()
{
super();
initialize();
}
public void initialize()
{
//empty layout
layout = new JFrame();
layout.setTitle("Task Synchronization ");
layout.setBounds(100, 100, 800, 600);
layout.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
layout.getContentPane().setLayout(null);
//set the copyright
JLabel lblNewLabel_5 = new JLabel("(c) 2012 All Rights Reserved");
lblNewLabel_5.setForeground(Color.GRAY);
lblNewLabel_5.setFont(new Font("Tahoma", Font.PLAIN, 10));
lblNewLabel_5.setHorizontalAlignment(SwingConstants.RIGHT);
lblNewLabel_5.setBounds(527, 548, 255, 14);
layout.getContentPane().add(lblNewLabel_5);
//set the label
JLabel lblSendAFile = new JLabel("Select a …我正在尝试一些代码,但我无法编译它.有什么错误吗？我已附上以下代码.
import java.util.*;
import java.io.*;
import javax.swing.*;
import java.awt.event.*;
public class Node
{
private int nodeId;
private List<Connection> outboundConnections = new ArrayList<>();
public Node(int nodeId)
{
this.nodeId = nodeId;
}
public void addConnection(Connection connection)
{
this.outboundConnections.add(connection);
}
}
当我编译时,我遇到了这种错误:
Node.java:9: error: cannot find symbol
private List<Connection> outboundConnections = new ArrayList<>();
^
symbol: class Connection
location: class Node
Node.java:16: error: cannot find symbol
public void addConnection(Connection connection)
^
symbol: class Connection
location: class Node
Node.java:9: error: unexpected type
private List<Connection> outboundConnections …我正在用c ++读取文件,这是我的代码:
#include <iostream>
#include <fstream>
#include <algorithm>
#include <climits>
using namespace std;
int main()
{
int row=0;
int col=0;
ifstream inputFile;
int arr[16][5];
inputFile.open("hdtt4req.txt");
if(inputFile.is_open()) {
inputFile >> arr[row][col];
for (row = 0; row < 16; row++) {
for (col = 0; col < 5; col++) {
cout <<"hi"; //arr[row][col];
cout << endl;
}
}
}
return 0;
}
这是我想要阅读的文件:
1 2 2 1 2
2 1 1 1 2
3 1 1 1 6
4 2 2 3 …