Help writing to file in "C" using JNI

Question

Hi,
I am trying to write the encrypted data that I read from a file. It writes the decrypted data; however, it prints extra characters at the end of file after the data. I am not sure why this is happening. Below is the code that I use to write the decrypted data to a file. I am using "C" and JNI to call Java classes in my application which is a DLL.
     cipherFile = fopen ( "C:\\ciphertext.1-6", "w" );
     if (cipherFile==NULL)
         printf("\nCan't open cipherFile\n");
         return -1;        
     fprintf(cipherFile, "%s", pass2EncToXUTF);                           
     // obtain file size.
    fseek (cipherFile , 0 , SEEK_END);
    lSize = ftell (cipherFile);
    printf("Size of cipherFile file:  %d\n", lSize);
    rewind (cipherFile);
     fclose(cipherFile);--------------------------------------------------------------------------------
Here is the output.....
John Doe 123-45-6789 1234567890123456 01/01/1950
Jane Doe 234-56-7890 2345678901234567 02/02/1951
John Smith 345-67-8901 3456789012345678 03/03/1952
Jane Smith 456-78-9012 4567890123456789 04/04/1953
John Walker 567-89-0123 5678901234567890 05/05/1954
Jane Walker 678-90-1234 6789012345678901 06/06/1955
John Asia 789-01-2345 7890123456789012 07/07/1956
John Africa 890-12-3456 8901234567890123 08/08/1957
John Europe 901-23-4567 9012345678901234 09/09/1958
John America 012-34-5678 0123456789012345 10/10/1959
��������������
As you can see, there is some garbage printed at the end of file. Why?
Any help will be greatly appreciated. Thanks in advance.

Answer 1

Sorry about that.
Here's the code for jstring pass2EncToXUTF.
pass2EncToXUTF = (*env)->GetStringUTFChars(env, resultOfEncToX, 0);
      if (pass2EncToXUTF == NULL) {
        printf("pass2EncToXUTF is null\n");
        exit(1);
      printf("\nResult of pass2EncToXUTF: %s\n", pass2EncToXUTF);