Question

I have a binary file written in C and I want to read it in java. I wrote the file in C like this :

void Log(TCHAR *name,int age){
    write_int(file, 2012);
    write_int(file, 4);
    write_int(file, 16);
    write_int(file, 12);
    write_int(file, 58);
    write_int(file, 50);

    fwrite(&name, sizeof(name), 1, file);
    fwrite(&age, sizeof(age), 1, file);
    fflush(processusFile);
}

In Java I use the BinaryFile class http://www.heatonresearch.com/code/22/BinaryFile.java and I do this :

RandomAccessFile f = new RandomAccessFile("myfile.dat", "r");
BinaryFile binaryFile = new BinaryFile(f);
ArrayList<String> text = new ArrayList<>();
while (true) {
try {
    Calendar calendar = new GregorianCalendar();
    int year = (int) binaryFile.readDWord();
    int month = (int) binaryFile.readDWord();
    int date = (int) binaryFile.readDWord();
    int hourOfDay = (int) binaryFile.readDWord();
    int minute = (int) binaryFile.readDWord();
    int second = (int) binaryFile.readDWord();

    calendar.set(year, month, date, hourOfDay, minute, second); 
    System.out.println(binaryFile.readFixedString(64));    
    catch (Exception e) {
        break;  
    }
}

This is not working for char* but for int it works. How I can write Strings?

Answer 1

This is because sizeof(name) is the size of a char pointer on your system, not the length of the string. You need to write out the length separately from the string, too.

size_t len = strlen(name);
write_int(file, len);
fwrite(&name, len, sizeof(char), file);