Ganymed API: Using SFTP

Question

I am using the Ganymed API to access a Unix server. I can create a file on the server, but the contents of the file are always empty.

Ganymed API Location: http://www.ganymed.ethz.ch/ssh2/

code:

function (ByteArrayOutputStream reportBytes){ // reportBytes is a valid ByteArrayOutputStream // if I write it to a file in to a local directory using reportBytes.writeTo(fout); // I can see the contents */ byte byteArray[]=reportBytes.toByteArray(); SFTPv3FileHandle SFTPFILEHandle=sftpClient.createFileTruncate("test.txt"); //The file is created successfully and it is listed in unix // The permissions of the file -rw-r--r-- 1 test.txt sftpClient.write(SFTPFILEHandle, 0, byteArray, 0,byteArray.length ); //The above line doesnt seem to work, the file is always empty } /* write function definition is */ public void write(SFTPv3FileHandle handle, long fileOffset, byte[] src, int srcoff, int len) throws IOException 

Can someone tell me that I'm doing something wrong here.

Answer 1

I tried to solve your problem, and I found myself in the same situation, the created file remains empty.

However, I think I found the cause of the problem.

Here is an excerpt from ch.ethz.ssh2.SFTPv3Client.write () of the ganymed API method

  /** * Write bytes to a file. If <code>len</code> &gt; 32768, then the write operation will * be split into multiple writes. * * @param handle a SFTPv3FileHandle handle. * @param fileOffset offset (in bytes) in the file. * @param src the source byte array. * @param srcoff offset in the source byte array. * @param len how many bytes to write. * @throws IOException */ public void write(SFTPv3FileHandle handle, long fileOffset, byte[] src, int srcoff, int len) throws IOException { checkHandleValidAndOpen(handle); if (len < 0) while (len > 0) { 

You see, when you send data for writing, len is> 0, and due to the fictitious condition, the method returns immediately, and it never enters the while loop (which actually writes something to the file).

I assume that it was immediately after "if (len & lt 0)" earlier, but someone removed it and left us a useless part of the code ...

Update:

Go get the latest version (the example above used assembly 210). I had no problems building 250 and 251.

Here is my code, and it writes the new file correctly on my ssh server.

you will need bulletproof :)

  public static void main(String[] args) throws Exception { Connection conn = new Connection(hostname); conn.connect(); boolean isAuthenticated = conn.authenticateWithPassword(username, password); if (isAuthenticated == false) throw new IOException("Authentication failed."); SFTPv3Client client = new SFTPv3Client(conn); File tmpFile = File.createTempFile("teststackoverflow", "dat"); FileWriter fw = new FileWriter(tmpFile); fw.write("this is a test"); fw.flush(); fw.close(); SFTPv3FileHandle handle = client.createFile(tmpFile.getName()); FileInputStream fis = new FileInputStream(tmpFile); byte[] buffer = new byte[1024]; int i=0; long offset=0; while ((i = fis.read(buffer)) != -1) { client.write(handle,offset,buffer,0,i); offset+= i; } client.closeFile(handle); if (handle.isClosed()) System.out.println("closed");; client.close(); }