4 bytes into one int
Hi, I have four bytes in my program, I'd add them together somehow so that i have a 32bit string, how can I do this?
I tried adding them together and storing into an int but when i tried to do bit shifting I got an unexpected result.
int x = byte[0] + byte[1] + byte[2] + byte[3];Where am i going wrong?
thx
Edited by: Unconditional on Jan 25, 2008 12:35 PM
You need to use bit shifting. However, you need to decide whether [0] is the high byte or the low byte (big-endian or little-endian).
EDIT: Also, "32bit string"? You mean "32-bit int" right?
Edited by: paul.miner on Jan 25, 2008 2:39 PM
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catch (IOException exc)
JOptionPane.showMessageDialog(this,"Please enter the file name","Error",JOptionPane.ERROR_MESSAGE);
return(false);
private void outputToFile() throws IOException
// Initial output
textArea.append("File name = " + fileName_out + "\n");
// Test if data exists
if (data != null)
fileOutput.println(fileName_in.getName() +"\t"+ slope+"\t"+intb+"\t"+corr+"\t"+r_sqrt);
textArea.append("File output complete\n\n");
else
textArea.append("No data\n\n");
// End by closing file
initialcomp();
fileOutput.close();
private void initialcomp()
slope=0.0;
intb=0.0;
corr=0.0;
r_sqrt=0.0;
sumx=0.0; sumy=0.0; multixy=0.0; square_x_sum=0.0; square_y_sum=0.0;
for(int i=0;i<data.length;i++)
for(int j=0;j<data[i].length;j++)
data[i][j]=null;
/* MAIN METHOD */
public static void main(String[] args) throws IOException
// Create instance of class FileChooser
FileReduction1 newFile = new FileReduction1("File Reduction Program");
// Make window vissible
newFile.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
newFile.setSize(500,400);
newFile.setVisible(true);
Sorry about the long lines.
As you can see, all input files saved in array called files, however when OpenFile1() function is called, it take input (fileName_in) as a single file not an array. I'm assuming this causes the exception.
When there's muptiple inputs, program should take each file from getFileName() to outputToFile() sequentially.
Does anybody have an idea to solve this?
Thanks a lot!!you naming convention is confussing. you should follows Java naming convention..you have a getXXX but decalred the return type as "void"...get usully means to return something...
your code is doing too much..and hard to follows..
1. get the selected files
for each selected file
process the file and return the result
write out the result.
/** close the precious resource */
public void closeResource(Reader in){
if (in != null){
try{ in.close(); }
catch (Exception e){}
/** get the total number of line in a file */
public int getLineCount(File file) throws IOException{
BufferedReader in = null;
int lineCount = 0;
try{
in = new BufferedReader(new FileReader(file));
while ((in.readLine() != null)
lineCount++;
return lineCount;
finally{ closeResource (in); }
/** read the file */
public void processFile(File inFile, File outFile) throws IOException{
BufferedReader in = null;
StringBuffer result = new StringBuffer();
try{
in = new BufferedReader(new FileReader(inFile));
String line = null;
while ((in.readLine() != null){
.. do something with the line
result.append(....);
writeToFile(outFile, result.toString());
finally{ closeResource (in); }
public void writeToFile(File outFile, String result) throws IOException{
PrintWriter out = null;
try{
out = new PrintWriter(new FileWriter(outFile, true)); // true for appending to the end of the file
out.println(result);
finally{ if (out != null){ try{ out.close(); } catch (Exception e){} } }
} -
Fetch data from two tables and insert into one table
I have similar to the following data in two tables (@Plant, @PlantDirector) and need to consolidate into one table (@PlantNew) as follows.
DECLARE @Plant TABLE (PlantID INT, PlantName VARCHAR(100))
INSERT INTO @Plant (PlantID, PlantName) VALUES (1, 'Name One'),(2, 'Name Two'),(3, 'Name Three'),(4, 'Name Four'),(5, 'Name Five'),(6, 'Name Six')
Director data for the Plants exist in the following table. Assistant value 1 means Assistant Director and 0 means Director.
Data exists only for subset of plants and a Plant may have one or both roles.
DECLARE @PlantDirector TABLE (PlantID INT, PlantDirectorID INT, Assistant bit)
INSERT INTO @PlantDirector (PlantID, PlantDirectorID, Assistant) VALUES (2, 111, 1),(2, 222, 0),(4, 333, 0),(6,444,1)
The above data needs to be inserted into one table (@PlantNew) as follows:
PlantID in @Plant table is IDENTITY value and needs to be inserted as-is into this table.
PlantDirExists will get a value of 1 if at least one record exists in @PlantDirector table for a PlantID. PlantAssistantDirID and PlantDirID should be set to the corresponding PlantDirID or NULL appropriately depending on the data.
DECLARE @PlantNew TABLE (PlantID INT, PlantName VARCHAR(100), PlantDirExists bit, PlantAssistantDirID INT, PlantDirID INT)
INSERT INTO @PlantNew (PlantID, PlantName, PlantDirExists, PlantAssistantDirID, PlantDirID)
VALUES (1, 'Name One', 0, NULL, NULL),(2, 'Name Two', 1, 111, 222),(3, 'Name Three', 0, NULL, NULL),(4, 'Name Four', 1, NULL, 333),(5, 'Name Five', 0, NULL, NULL),(6, 'Name Six',1, 444, NULL)
How do I achieve the above using SQL ? Thanks.like this
INSERT @PlantNew (PlantID, PlantName, PlantDirExists, PlantAssistantDirID, PlantDirID)
SELECT p.PlantID,
p.PlantName,
CASE WHEN pd.PlantID IS NULL THEN 0 ELSE 1 END,
PlantAssistantDirID,
PlantDirID
FROM @Plant p
LEFT JOIN (SELECT PlantID,
MAX(CASE WHEN Assistant = 1 THEN PlantDirectorID END) AS PlantAssistantDirID,
MAX(CASE WHEN Assistant = 0 THEN PlantDirectorID END) AS PlantDirID
@PlantDirector
GROUP BY PlantID)pd
ON pd.PlantID = p.PlantID
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs
You're missing a FROM
insert into @PlantNew
SELECT p.PlantID,
p.PlantName,
CASE WHEN pd.PlantID IS NULL THEN 0 ELSE 1 END,
PlantAssistantDirID,
PlantDirID
FROM @Plant p
LEFT JOIN (SELECT PlantID,
MAX(CASE WHEN Assistant = 1 THEN PlantDirectorID END) AS PlantAssistantDirID,
MAX(CASE WHEN Assistant = 0 THEN PlantDirectorID END) AS PlantDirID
from @PlantDirector
GROUP BY PlantID)pd
ON pd.PlantID = p.PlantID -
What is the efficient way of insert some bytes into a file?
Hello, everyone:
If I want to insert some bytes into a file (for example, insert the bytes before all the original content of the file, or append the bytes to a file), and the size of the original file is very big. I am wondering what is the efficient way? Where can I get some sample codes?
regards,
GeorgeThanks, DrClap.
I have tried your method and you are correct. I have written a simple program which can be used to insert "Hello World " to the start of a file ("c:\\temp\\input.txt"), and I have verified that it can work. Please help to see whether it is correct and whether it has a more efficient way.
public class TestDriver {
public static void main(String[] args) {
byte[] back_buffer = new byte [1024];
byte[] write_buffer = new byte [1024];
System.arraycopy("Hello World".getBytes(), 0, write_buffer, 0, "Hello World".getBytes().length);
int write_buffer_length = "Hello World ".getBytes().length;
int count = 0;
FileInputStream fis = null;
FileOutputStream fos = null;
try {
fis = new FileInputStream (new File("c:\\temp\\input.txt"));
fos = new FileOutputStream (new File("c:\\temp\\output.txt"));
while ((count = fis.read (back_buffer)) >= 0)
fos.write(write_buffer, 0, write_buffer_length);
System.arraycopy (back_buffer, 0, write_buffer, 0, count);
write_buffer_length = count;
//write the last block
fos.write(write_buffer, 0, write_buffer_length);
fis.close();
fos.close();
//copy content back into original file
fis = new FileInputStream (new File("c:\\temp\\output.txt"));
fos = new FileOutputStream (new File("c:\\temp\\input.txt"));
while ((count = fis.read (back_buffer)) >= 0)
fos.write(back_buffer, 0, count);
fis.close();
fos.close();
//remove temporary file
File f = new File ("c:\\temp\\output.txt");
f.delete();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
try {
fis.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
try {
fos.close();
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
try {
fis.close();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
try {
fos.close();
} catch (IOException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}regards,
George
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