java.io.InputStream
net.rim.device.api.io.FileInputStream
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java.lang.Object
public final class FileInputStream
Provides low-level access to various file systems. This class provides acces to only the iDEN file system. To access
file systems such as the device store or SDCard use the javax.microedition.io.file classes.
Sample code
FileInputStream fileIn = null;
try
{
fileIn =
new FileInputStream(File.FILESYSTEM_PATRIOT, inputFileName);
StringBuffer sb = new StringBuffer();
int r;
try
{
while ((r
= fileIn.read()) != -1)
{
sb.append( r );
}
}
}
catch(IOException ioe)
{
}
finally
{
if(fileIn
!= null)
{
fileIn.close();
}
}
| Constructor Summary | ||
|---|---|---|
|
FileInputStream(int fs,
String fileName)
Deprecated. use javax.microedition.io.file |
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| Method Summary | ||
|---|---|---|
|
void |
close()
Deprecated. use javax.microedition.io.file |
|
int |
read()
Deprecated. use javax.microedition.io.file |
|
int |
read(byte[] b,
int off,
int len)
Deprecated. use javax.microedition.io.file |
| Methods inherited from class java.io.InputStream |
|---|
available, mark, markSupported, read, reset, skip |
| Methods inherited from class java.lang.Object |
|---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
|---|
public FileInputStream(int fs,
String fileName)
throws IOException
fs - One of the FILESYSTEM_ values.fileName - The name of the file.
IllegalArgumentException - If fs is an invalid filesystem (not one of the
net.rim.device.api.io.File.FILESYSTEM_constants).
IOException - if an I/O error occurs.| Method Detail |
|---|
public int read()
throws IOException
InputStreamint in the range 0 to
255. If no byte is available because the end of the stream
has been reached, the value -1 is returned. This method
blocks until input data is available, the end of the stream is detected,
or an exception is thrown.
A subclass must provide an implementation of this method.
read in class InputStream-1 if the end of the stream is reached.
IOException - if an I/O error occurs.
public int read(byte[] b,
int off,
int len)
throws IOException
InputStreamlen bytes of data from the input stream into
an array of bytes. An attempt is made to read as many as
len bytes, but a smaller number may be read, possibly
zero. The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
If b is null, a
NullPointerException is thrown.
If off is negative, or len is negative, or
off+len is greater than the length of the array
b, then an IndexOutOfBoundsException is
thrown.
If len is zero, then no bytes are read and
0 is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at end of
file, the value -1 is returned; otherwise, at least one
byte is read and stored into b.
The first byte read is stored into element b[off], the
next one into b[off+1], and so on. The number of bytes read
is, at most, equal to len. Let k be the number of
bytes actually read; these bytes will be stored in elements
b[off] through b[off+k-1],
leaving elements b[off+k] through
b[off+len-1] unaffected.
In every case, elements b[0] through
b[off] and elements b[off+len] through
b[b.length-1] are unaffected.
If the first byte cannot be read for any reason other than end of
file, then an IOException is thrown. In particular, an
IOException is thrown if the input stream has been closed.
The read(b, off, len) method
for class InputStream simply calls the method
read() repeatedly. If the first such call results in an
IOException, that exception is returned from the call to
the read(b, off, len) method. If
any subsequent call to read() results in a
IOException, the exception is caught and treated as if it
were end of file; the bytes read up to that point are stored into
b and the number of bytes read before the exception
occurred is returned. Subclasses are encouraged to provide a more
efficient implementation of this method.
read in class InputStreamb - the buffer into which the data is read.off - the start offset in array b at which the data is written.len - the maximum number of bytes to read.
-1 if there
is no more data because the end of the stream has been reached.
IOException - if an I/O error occurs.InputStream.read()
public void close()
throws IOException
InputStream The close method of InputStream does
nothing.
close in class InputStreamIOException - if an I/O error occurs.
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