casting error
 

Hi everyone,
I am doing a simple program that the user is able to select whatever folders(not files) in the drive(through the argument of the folderpaste function) and is able to paste the folders(with their contents)
in the the path "C:\" but i think my main problem is that i have to cast a string into file object but there may also be other errors. The entire program compiles with no errors but when i print the stack trace i find the following errors

java.io.FileNotFoundException: D:\Sample_pics (Access is denied)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)

java.lang.ClassCastException
at JFileExplorer.folderpaste(JFileExplorer.java:285)

The files do exist and their access is not denied nor are the encrypted in any fashion.

I will only list the folderpaste function and not the entire program as the other functions in the program all work okay including the copying function.

The argument passed into the folderpaste function are the file names of the folders (including their previous path). Thus if the folder' s file name that was copied is "D:\Sample_pictures" my function will input stream that particular folder and cut the string to "Sample_pictures" and then do some string manipulation until the string reads "C:\Sample_pictures" and then output stream the previously copied file to its new location.

I know it sounds complicated but please try to have a look at my function and tell me or show me what i am doing wrong.

If someone has any sample codings of how to paste files or folders from
from one place to the other please show it or e-mail it to me.

The function is as follows:

public void folderpaste (File[ ] file)
{
String k, w, m, l, p, m1;
int i=0, j, len;
byte[] buffer1 = new byte[2048];
k = ("C:");

File f;

for(i=0;i<file.length;i++)
{

try
{

FileInputStream in = new FileInputStream(file[i]);

m = file[i].toString();
System.out.println(m);
//The below command line is not wrong as in java
// "\\" is actually equal to "\"

j = m.lastIndexOf("\\");
w = m.substring(j+1);
l = (k + "\\" + w);
//This is where i think the error occurs as i try to cast the string into an
//object and then recast that object into a file object

Object f1 = (Object)l;

f = (File)f1;

if(f.exists() == true)
{
m1 = f.toString();
p = (m1 + " copy " + i);
}

else
{
p = f.toString();
}

FileOutputStream out = new FileOutputStream(p);

while((len = in.read(buffer1)) != -1)
{
out.write(buffer1, 0, len);
}

in.close();
out.close();

}

catch(IOException e)
{
e.printStackTrace();
Label1.setText("An error pasting the file has occured");
}

}

}

My e-mail is freesoft_2000@yahoo.com

Thank you for your patience

Yours Sincerely

Richard West

Re: casting error
 

Whoa... long convoluted question ;-). I hope I understand what you are asking. You simply want to copy the array of files to a particular directory?

If you simply want to move the file, try renameTo.

If you want to copy the file, see here.

Hope this helps.


Ed

Re: casting error
 

This is where your cast problem is. You should never cast an object to a type that it does not inherit or implement. Instead you should just create a new file object.

f = new File(l); // where l is the string containing the path of your new file

Ed

Re: casting error
 

Ok. Sorry last post. I just noticed this problem of yours. Using the "\\" is very bad. That is a platform dependent file separator. Instead consider using File.pathSeparatorChar or File.pathSeparator.


Ed

Re: casting error
 

hi everyone,
That is exactly what i wanted cosi but instead of copying files i want to copy folders from one location to another. I have resolved the cast exception problem and changed it to File f = new File(l); but the exception of that the file is not found is still there.

java.io.FileNotFoundException: D:\Sample_pics (Access is denied)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(Unknown Source)

The folder does exist on that specified path but i do not know why the above exception always occurs. i am trying to copy the folders only and not files and i also do not understand why they say the folder is "Access denied" when its not.

I hope you can help me with this problem cosi

My e-mail is freesoft_2000@yahoo.com

Thank You

Yours Sincerely

Richard West

Re: casting error
 

hi everyone,
Sorry one more thing is that the jvm say that the line
//k is declared a string
k = (String)List2.getSelectedValue();
is a casting error but i don't think this is so.
Am i right or wrong cosi please tell me

Yours Sincerely

Richard west

Re: casting error
 

The problem here is that you are calling FileInputStream.open() on a directory (D:\Sample_pics). Append a filename to the end.


Ed

Re: casting error
 

I assume you are talking about a JList that you have populated with Strings?

Try a System.out.println(List2.getSelectedValue()). This will provide you with useful debugging information by printing exactly what kind of type it is you are dealing with in your list. It is very possible that you have a logical error and did not populate the List with Strings.


Ed