Object serialize

wyverex Joined: 02/09/08 Posts: 19

Posted: 04/22/08 21:24:38 I have an object that contains arrays of objects and I need to save and load these objects from file. I've been trying to serialize these objects to file but I'm getting errors.. Table.d(185): function tango.io.protocol.model.IReader.IReader.get (bool) does not match parameter types (item[]) Table.d(185): Error: cannot implicitly convert expression (this.order) of type item[] to void delegate(IReader) Table.d(185): function tango.io.protocol.model.IReader.IReader.get (bool) does not match parameter types (item[][]) Table.d(185): Error: cannot implicitly convert expression (this.data) of type item[][] to void delegate(IReader) Table.d(191): function tango.io.protocol.model.IWriter.IWriter.put (bool) does not match parameter types (item[]) Table.d(191): Error: expected 0 arguments, not 1 Table.d(191): function tango.io.protocol.model.IWriter.IWriter.put (bool) does not match parameter types (item[][]) class item { //column name, attribute... char[] name; //vlaue as int, length as string int ival; //string values char[] sval; //is this an int? bool isint; //..class funcs not important void read(Reader input) { input (name) (ival) (sval) (isint); } void write(Writer output) { output (name) (ival) (sval) (isint); } } /** * TokenNode * Returned for next command * contains token string and Type */ class Table { private char[] name; //table name // table data, holds the rows.. item[][] data; // row prototype, in order.. item[] order; //...class funcs not important void read(Reader input) { input (name) (order) (data); //185 } void write(Writer output) { output (name) (order) (data); // 191 } } Any suggestions, commits... I'm not even using these functions yet... just trying to compile them in the classes -Byron

Author	Message
wyverex Joined: 02/09/08 Posts: 19	Posted: 04/22/08 21:44:19 Changed table class to this void read(Reader input) { int orderlen, rowlen; item tmp; input (name) (orderlen) (rowlen); for(int i = 0; i < orderlen; ++i) { tmp.read(input); order[i] = new item(tmp); } for(int r = 0; r < rowlen; ++r) { for(int c = 0; c < orderlen; ++c) { tmp.read(input); data[r][c] = new item(tmp); } } } void write(Writer output) { output (name) (order.length) (data.length); foreach(o; order) o.write(output); foreach(r; data) foreach(c;r) c.write(output); } Compiles... now to see if it doead like it should.. -B
wyverex Joined: 02/09/08 Posts: 19	Posted: 04/24/08 17:40:57 just not working.... can't find what I'm missing.... This is my saving function void savetables() { foreach(t; tables) { auto fp = new FilePath(t.location); fp.native; debug Stdout("Saving Table: ")(fp.path~fp.file).newline; auto fc = new FileConduit (fp.path~fp.file, FileConduit.WriteCreate); auto write = new Writer(fc); t.write(write); // write (t); //gives compile errors..... fc.close(); //write (t); } } You can see the complete code here http://rockydog.no-ip.org:8080/svn/mydbms/
keinfarbton Joined: 12/03/05 Posts: 49	Posted: 04/24/08 22:41:56 What exactly is not working? Are the files written? Is the content correct? (check with hex editor) Can you reduce the example to write one 'item', then load it, then extend to write/read one Table?
wyverex Joined: 02/09/08 Posts: 19	Posted: 04/25/08 01:53:42 First I cant get it to act like its suppose too.. http://www.dsource.org/projects/tango/forums/topic/167 and its not writing anything to file...
keinfarbton Joined: 12/03/05 Posts: 49	Posted: 04/25/08 06:46:27 t.write(write); // write (t); //gives compile errors..... To make the second line compile, t must implement the interface IWritable. But the first line should work also. To find the problem its best to reduce it to the most trivial case. I copied this from your code above without trying to compile... auto fc = new FileConduit ("test.dat", FileConduit.WriteCreate); auto write = new Writer(fc); int value = 0x44556677; write(write); fc.close(); Does this work? Does it produce a file containing the value?
wyverex Joined: 02/09/08 Posts: 19	Posted: 04/27/08 14:44:09 auto fc = new FileConduit ("test.dat", FileConduit.WriteCreate); auto write = new Writer(fc); int value = 0x44556677; write(value); fc.close(); All I get is an empty file... Not being flushed somehow...?
wyverex Joined: 02/09/08 Posts: 19	Posted: 04/27/08 15:02:07 Ok so it wasn't flushing.. added a writer.flush; maybe this should be better documented somewhere... auto fc = new FileConduit ("test.dat", FileConduit.WriteCreate); auto write = new Writer(fc); int value = 0x44556677; write(value); write.flush; fc.close();
wyverex Joined: 02/09/08 Posts: 19	Posted: 04/29/08 16:11:41 Well the code work on windows with dmd but segfaults on Ubuntu x64 with gdc auto fc = new FileConduit ("test.dat", FileConduit.WriteCreate); //getting a segfault on the next line, fc is okay... auto write = new Writer(fc); int value = 0x44556677; write(value); write.flush; fc.close();