Java Development

[javec]

Hello,

I was wondering how I can open a .txt file on a memory card so that I can read the content?

The file is at the path: file:///testfile.txt

Thank you for any help.

[kzettel · Accepted solution]

You can open an input stream from the file using:

InputStream inputStream = null;
FileConnection fileConnection = (FileConnection) Connector.open( "file:///SDCard/testfile.txt");
if (fileConnection.exists()) {
    inputStream = fconn.openInputStream();
}

 To get the input stream as text you can read it to a ByteArrayOutputStream and create a new String from the bytes.

ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] buffer = new byte[BUFFER_SIZE];
while (true) {
    int bytesRead = inputStream.read( buffer, 0, BUFFER_SIZE );
    if (bytesRead == -1)
        break;
    byteArrayOutputStream.write( buffer, 0, bytesRead );
}
byteArrayOutputStream.flush();
byte[] result = byteArrayOutputStream.toByteArray();
byteArrayOutputStream.close();
String resultString = new String(result);

[realkilla]

Hello,

Is it necessary to sign code if you want to read and write content into a file.txt in the memory card?

[sonicboomboy]

No. It does not require code signing.

But to be sure check http://www.blackberry.com/developers/docs/4.7.0api/index.html to see if there are any signed elements