I have this problem using smartXLS library for Java
I try to export the sheets of a workbook as .png images using the method
workbook.sheetRangeToImage(row1,col1,row2,col2,file)
The code I use is as follows:
private static void takeValuePics() throws Exception {
WorkBook w = new WorkBook();
w.read(XLS_PATH + DIF_FILE_NAME);
int numSheets = w.getNumSheets();
String out;
for(int i=0;i<numSheets;i++) {
w.setSheet(i);
System.out.println(w.getNumber(1,1));
w.setPrintGridLines(true);
out = VAL_PATH + "values_" + w.getSheetName(i) + ".png";
w.sheetRangeToImage(0,0,LOOPS,3,out);
}
The constants are configured correctly and the file is read correctly.
(The println() prints correct values)
The .png files are created but they are completely empty! Just white rectangles.
Does anybody know what's wrong?
Problem solved by the fantastic SmartXLS support team!
I forward their answer:
You need set the print scale,it use the print scale value when exporting range to image
workBook.setPrintScale(100);
That was all!
Hope this helps people in the future.
Related
I have written a function which takes in a BufferedImage and compares it to a pre-existing image in my hard drive checking if they are same or not.
public boolean checkIfSimilarImages(BufferedImage imgA, File B) {
DataBuffer imgAdata = imgA.getData().getDataBuffer();
int sizeA = imgAdata.getSize();
BufferedImage imgB = null;
try {
imgB = ImageIO.read(B);
} catch (IOException ex) {
Logger.getLogger(SupportClass.class.getName()).log(Level.SEVERE, null, ex);
}
DataBuffer imgBdata = imgB.getData().getDataBuffer();
int sizeB = imgBdata.getSize();
if(sizeA == sizeB) {
for(int i = 0; i < sizeA; i++) {
if (imgAdata.getElem(i) != imgBdata.getElem(i)) {
return false;
}
}
}
return true;
}
This throws IOException "Cant read input file". Idk why this is happening. I am calling the function like this...
while(support.checkIfSimilarImages(currentDisplay, new File(pathToOriginalImage)) == false) {
System.out.println("Executing while-loop!");
bot.delay(3000);
currentDisplay = bot.createScreenCapture(captureArea);
}
where,
String pathToOriginalImage = "C:\\Users\\Chandrachur\\Desktop\\Home.jpg";
I can see that the path is valid. But as I am testing it for File.exists() or File.canRead() or File.absoluteFile().exists() inside the checkIfSimilarImages function and everything is returning false.
I have researched my question here and tried out these suggestions:
It is not only for this location, I have tried a variety of other locations but in vain. Also it is not a problem where I have hidden file extensions and the actual file might be Home.jpg.jpg .
The only thing that might be is that permissions might be different. I dont really know how to verify this, but there is no reason it should have some permission which is not readable by java. It is just another normal jpg file.
Can it be because I am passing the file object reference into a function so in this process somehow the reference is getting modified or something. I just dont know. I am running out of possibilities to test for...
The whole stack trace is as follows:
javax.imageio.IIOException: Can't read input file!
at javax.imageio.ImageIO.read(ImageIO.java:1301)
at battlesbot.SupportClass.checkIfSimilarImages(SupportClass.java:77)
at battlesbot.AutomatedActions.reachHomeScreen(AutomatedActions.java:72)
at battlesbot.BattlesBot.main(BattlesBot.java:22)
Exception in thread "main" java.lang.NullPointerException
at battlesbot.SupportClass.checkIfSimilarImages(SupportClass.java:81)
at battlesbot.AutomatedActions.reachHomeScreen(AutomatedActions.java:72)
at battlesbot.BattlesBot.main(BattlesBot.java:22)
C:\Users\Chandrachur\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 11 seconds)
I am on Windows 10, IDE is NetBeans.
UPDATE:
Huge thanks to #k5_ . He told me to paste this in path and it worked.
"C:/Users/Chandrachur/Desktop/Home.jpg";
It seems some invisible characters were in the path. But I still don't understand what that means.
Usually this kind of problem lies with access problem or typos in the filename.
In this case there were some invisible unicode characters x202A in the filename. The windows dialog box, the file path was copied from, uses them for direction of writing (left to right).
One way of displaying them would be this loop, it has 4 invisible characters at the start of the String. You would also see them in a debugger.
String x = "C:\\Users\\Chandrachur\\Desktop\\Home.jpg";
for(char c : x.toCharArray()) {
System.out.println( c + " " + (int) c);
}
I'm working on a .opus music library software which converts audio/video files to .opus files and tags them with metadata automatically.
Previous versions of the program have saved the album art as binary data apparently as revealed by exiftool.
The thing is that when I run the command to output data as binary using the -b option, the entire thing is in binary seemingly. I'm not sure how to get the program to parse it. I was kind of expecting an entry like Picture : 11010010101101101011....
The output looks similar to this though:
How can I parse the picture data so I can reconstruct the image for newer versions of the program? (I'm using Java8_171 on Kubuntu 18.04)
It looks like you're trying to open the raw bytes in a text editor, which will of course give you gobble-dee-gook since those raw bytes do not represent characters that can be displayed by any text editor. I can see from your output from exiftool that you are able to know the length of the image in bytes. Providing you know the beginning byte position in the file, this should make your task relatively easy with a little bit of Java code. If you can get the starting position of the image inside your file, you should be able to do something like:
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.*;
public class SaveImage {
public static void main(String[] args) throws IOException {
byte[] imageBytes;
try (RandomAccessFile binaryReader =
new RandomAccessFile("your-file.xxx", "r")) {
int dataLength = 0; // Assign this the byte length shown in your
// post instead of zero
int startPos = 0; // I assume you can find this somehow.
// If it's not at the beginning
// change it accordingly.
imageBytes = new byte[dataLength];
binaryReader.read(imageBytes, startPos, dataLength);
}
try (InputStream in = new ByteArrayInputStream(imageBytes)) {
BufferedImage bImageFromConvert = ImageIO.read(in);
ImageIO.write(bImageFromConvert,
"jpg", // or whatever file format is appropriate
new File("/path/to/your/file.jpg"));
}
}
}
I am using Selenium DataSource API to read excel in my project. I need to read excal as headerless but everytime it taking my first row as header.
Please tell how can i read file excel sheet as headerless file.
Please find Code below
public static void main(String[] args) {
String basePath = "C:\\excel file path";
DataTable table = new DataTable();
table.ImportSheet(basePath+"myTestingFile.xlsx");
System.out.println(Arrays.toString(table.getHeaderValues().toArray()));
for(int i = 1 ; i < table.getRowCount();i++){
table.setRowIndex(i);
System.out.println(table.getValueAt(0));
}
}
Please help me out in this scenario.
Which version you are using right now. Cause in version 0.7, This issue has been fixed.
Now you can use Excel Sheet as Headerless file.
Find the Code below
String basePath = "C:\\excel file path";
DataTable table = new DataTable();
table.setHeaderless();
table.ImportSheet(basePath+"myTestingFile.xlsx");
System.out.println(Arrays.toString(table.getHeaderValues().toArray()));
for(int i = 1 ; i < table.getRowCount();i++){
table.setRowIndex(i);
System.out.println(table.getValueAt(0));
}
Please try with this code.
As per provided code
System.out.println(table.getValueAt(0));
here need to use column name like below
String name = dt.getValueAt("<-Name of Column->");
System.out.println(name);
but used '0' that is the reason why it displaying unexpected results. Please refer doc here
this is my first question in this forum....
I'm making adata-mining application in java with the WEKA API.
I make first a pre-processing stage and when I save the ARFF file i would like to add a couple of lines (as comments) specifing the preprocessing task that i have done to the file...
the problem is that i don't know how to add comments to an ARFF file from the java WEKA API.
To save the file i use the class ArffSaver like this...
try {
ArffSaver saver = new ArffSaver();
saver.setInstances(dataPost);
saver.setFile(arffFile);
saver.writeBatch();
return true;
} catch (IOException ex) {
Logger.getLogger(Preprocesamiento.class.getName()).log(Level.SEVERE, null, ex);
return false;
}
I would be really greatfull if someone could give some idea...
thanks!
You should AVOID writting comments on an .arff file, even more when writting it from Java. These files are very "parser-sensitive". The Weka API to create these files is restrictive for this particular reason.
Even though, you can always add your comments manually with the % symbol. This said, I wouldn't recommend you writting anything more than instances, attributes and values into an .arff file. ;-)
I don't see a reason to not write comments into the header of an ARFF file. The specification clearly says:
Lines that begin with a % are comments.
So while it is technically valid, it can be difficult if you want to use the ArffSaver#setFile method. This method does a lot of (convenient, but somewhat arbitrary and unspecified) work internally, until it finally calls
setDestination(new FileOutputStream(m_outputFile));
If this is not required, the easiest option is to write directly to an OutputStream, which then can simply be set as the destination for the ArffSaver. This can be wrapped in a small helper method, for example, like this:
static void writeArff(
Instances instances,
List<String> commentLines,
OutputStream outputStream) throws IOException
{
ArffSaver saver = new ArffSaver();
saver.setInstances(instances);
if (commentLines != null && !commentLines.isEmpty())
{
BufferedWriter bw = new BufferedWriter(
new OutputStreamWriter(outputStream));
for (String commentLine : commentLines)
{
bw.write("% " + commentLine + "\n");
}
bw.write("\n");
bw.flush();
}
saver.setDestination(outputStream);
saver.writeBatch();
}
When calling it like this
List<String> comments = Arrays.asList("A comment", "Another one");
writeArff(instances, comments, outputStream);
then the given comments will be inserted at the top of the ARFF file.
I am writing to a framebuffer located at "/dev/fb0". Everything works fine until I try to write again to the pipe using an OutputStream, which hangs the program. I have resolved this by closing the output stream and then recreating it, but this seems awfully slow and blunt.
Framebuffer.java
public class Framebuffer extends Autobuffer {
private FileOutputStream out = null;
private File pipe = null;
public Framebuffer() {
super(320, 240);
}
public Framebuffer(File pipe) {
super(320, 240);
try {
out = new FileOutputStream(pipe);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
this.pipe = pipe;
}
public void sync() throws IOException {
out.write(getBytes());
out.close();
out = new FileOutputStream(pipe);
}
}
Any ideas?
Thanks.
Firstly, unless something really weird is going on, "/dev/fb0" is a device file not a pipe. [This is a nitpick, but if you use the wrong terminology, 1) people won't understand you and 2) you will have difficulty searching for answers.]
Secondly, this looks like a weird way to interact with a framebuffer!!
I suspect that the problem is that you need to do the equivalent of a POSIX lseek call to set the stream position to zero each time you draw a frame. I've found two ways to do this:
Use RandomAccessFile instead of OutputStream / FileOutputStream, and call seek(long) to seek the file.
Call FileOutputStream.getChannel(), and then use position(long) to seek the file.
Changing the Output Stream to RandomAccessFile fixed all of my problems. I bet the stream wasn't working because it can't seek to position 0. Thanks to all who replied.
What if you flush your output with flush (from OutputStream)?