UTF-8 as default encoding

[quique123]

Hi everyone,

After a while using XmlRpc++, one of the failures that A. Dedov pointed (lack of UTF-8 support) is becoming more important to us in the project because of multilanguage support. As long as the input parameters are std::string values, it can be than the parsing, when using ASCII over the 127 does not work correctly.

As "workaround", I did the following:
- defined two new static functions XmlRpcUtil::ascii_to_utf8 and XmlRpcUtil::utf8_to_ascii
- Changed the XML header, adding encoding="UTF-8"
- Changed the functions XmlRpcValue::stringFromXml and XmlRpcValue::stringToXml to parse the input/output parameters (strings) between ASCII and UTF-8

I am trying to evaluate these changes risks. I would appreciate to hear your comments about the idea (in general) and the changes I mentioned.

If needed, I can also provide the source code

Thanks,

Jose Camacho
in Xml

[dabeat]

Hello Jose,

I am using xmlrpc++ to develop a xmlrpc C++ client. I use it with an xmlrpc Java server.
I have to send an array of strings from the client to the server. If I do this task from an xmlrpc Java client, of course, there is no problem.
But when I use the C++ client, I got this error message in the server side:

org.apache.xmlrpc.XmlRpcException: Failed to read XML-RPC request: Invalid byte 1 of 1-byte UTF-8 sequence.

The way I have coded the xmlrpc C++ client to send the strings array is:

...
std::string playlist[10];
...
for(int i=0; i<10; i++){
  
    playlist[i] = "test";
}
...
XmlRpcValue arg;
arg[0] = param;
...

I don't know what is happening, only that is related to the xml message codification. If you could tell me how I could solve the problem...

By the way, I am from Barcelona, I think you may speak spanish because of your name. If you don't understand something from this message I could mail you in spanish.

Thank you.

[quique123]

Hi,

this message has nothing to do with the main subject (UTF as encoding), but I try to answer it anyway ;-)

I do not really understand your code. Maybe it is a copy-paste failure, I mean the playlist object is not used at all, instead of that, you transmit the arg list getting data from "param". In general, it is not a good idea to use "arg" as variable name...

Also, it is better assign single data, instead of the complete list in a "entry" of a XmlRpcValue object.

I think, your code should look like the following (I change the list for testing porposes)

std::string playlist[10];
for(int i=0; i<10; i++)
{
  playlist[i] = "test";
  playlist[i] += i;
}
...

/* Main changes here */
XmlRpcValue xmlParams;
for (int i=0; i<10; i++)
   xmlParams [i] = std::string (playlist[i]);

Try it and let us know, how now works.

Regards,

Jose

PS.- Yes, I can spanish, but I better write the answer in english for other people that can't

[dabeat]

Thanks Jose, now it works perfectly.

Anyway, I write a problem I have got with this librery and I have had to solve. As a server aI use an XmlRpc Java server, hence, I use a Java library.

But I realized when I sent an array of elements (as in your example), the Java server got, for example, if I sent an array of two strings, two strings instead of a Java Vector. I had a look at the source code of XMLRPC++ library and I found the library doesn't code arrays. I mean, I didn't find the library did:

<array>
  <data>
    <value><string>Something here</string></value>
    <value><string>Something here2</string></value>
    <value><string>Something here3</string></value>
  </data>
</array>

So I had to re-write a piece of source code. Now I only send arrays, but it is enough for me.

I have now a problem. XmlRpcValue object doesn't return size if they have no elements, that is, they never return size = 0. They only return size if they have elements.
I don't know if it is not possible but I have found nothing strange in XmlRpcValue header and I don't know whay it doesn't work. It would be very useful.

Thanks

[quique123]

What I understood from your message:
- You are using XmlRpc++ library in your client side
- In the server side, you are using a "third party" XML-RPC library (not XmlRpc++ lib), developed in Java

To help you, I would need what exactly you want to send (better said, what the server expects to receive) and how your client source code is.

But, for documentation porpousses, please, open a new thread with this issue.

Jose