The thing is, even when I comment out my "sync" code that makes the game
wait, it still doesn't work. Without pausing the main loop and without
sleep calls, my net_httpGet function returns false immediately, but the
game still runs, and callback happens a bit later, but it's always status 0
and message is NULL, so I don't know what's wrong. Under what conditions
does this happen?
Ok, I searched through Emscripten source, and by modifying it a bit, I
located where the call happens:
emscripten_async_wget2_data: function(url, request, param, arg, free,
onload, onerror, onprogress) {
var _url = Pointer_stringify(url);
var _request = Pointer_stringify(request);
var _param = Pointer_stringify(param);
var http = new XMLHttpRequest();
http.open(_request, _url, true);
http.responseType = 'arraybuffer';
var handle = Browser.getNextWgetRequestHandle();
// LOAD
http.onload = function http_onload(e) {
if (http.status == 200 || _url.substr(0,4).toLowerCase() != "http") {
var byteArray = new Uint8Array(http.response);
var buffer = _malloc(byteArray.length);
HEAPU8.set(byteArray, buffer);
if (onload) Runtime.dynCall('viiii', onload, [handle, arg, buffer,
byteArray.length]);
if (free) _free(buffer);
} else {
if (onerror) Runtime.dynCall('viiii', onerror, [handle, arg,
http.status, http.statusText]);
}
delete Browser.wgetRequests[handle];
};
// ERROR
http.onerror = function http_onerror(e) {
if (onerror) {
Runtime.dynCall('viiii', onerror, [handle, arg, http.status,
http.statusText]); <--- HERE!
}
delete Browser.wgetRequests[handle];
};
// PROGRESS
http.onprogress = function http_onprogress(e) {
if (onprogress) Runtime.dynCall('viiii', onprogress, [handle, arg,
e.loaded, e.lengthComputable || e.lengthComputable === undefined ? e.total
: 0]);
};
// ABORT
http.onabort = function http_onabort(e) {
delete Browser.wgetRequests[handle];
};
// Useful because the browser can limit the number of redirection
try {
if (http.channel instanceof Ci.nsIHttpChannel)
http.channel.redirectionLimit = 0;
} catch (ex) { /* whatever */ }
if (_request == "POST") {
//Send the proper header information along with the request
http.setRequestHeader("Content-type",
"application/x-www-form-urlencoded");
http.setRequestHeader("Content-length", _param.length);
http.setRequestHeader("Connection", "close");
http.send(_param);
} else {
http.send(null);
}
Browser.wgetRequests[handle] = http;
return handle;
},
So, it's being called as XMLHttpRequest onerror handler, but it gives me
zero as status and no message. At least I know now that it isn't in the
onload() call if HTTP status is different than 200 or the URL doesn't start
with http. But still - why? What makes this XMLHttp request fail in such a
way?
On Friday, November 14, 2014 9:08:30 PM UTC+1, Sergey Kurdakov wrote:
>
> Hi Alexandar,
>
> as it was me, who advised - emscripent_wget - if you try to search code is
> done around async xmlhttprequest , it works just fine if it is used in
> async way.
>
> if you want how to make things, there is an engine
> https://github.com/floooh/oryol which implements IQ queues such that
> after you got response it is stored and on next tick you can get if from IO
> queue
>
> it is possible to make things sync, but that requires deeper knowledge of
> internals so most probably you will fail with that.
>
> thus my suggestion - to keep things async as if you used pure
> xmlhttprequest
>
> Regards
> Sergey
>
>
>
> On Fri, Nov 14, 2014 at 10:43 PM, Aleksandar Stančić <[email protected]
> <javascript:>> wrote:
>
>> I tried wget2_data now and it still doesn't work. It seems it isn't even
>> trying to download the file, it's not HTTP related, as with v2 I
>> immediately get onerror callback and error code is 0, and my error message
>> is NULL, so I still have no clue what is going on. I am relatively new to
>> Emscripten, so I might be missing something. Do I need some special
>> settings for compiler and/or linker to make this work? Anything
>> browser-related? I tested on latest Firefox and Chrome on Linux, same thing
>> every time.
>>
>> On Thursday, November 13, 2014 11:36:36 AM UTC+1, Sergey Kurdakov wrote:
>>>
>>> Hi Alexandar,
>>>
>>> >won't emscripten_async_wget serve your needs?
>>>
>>> I mean set of functions
>>>
>>> emscripten_async_wget
>>> emscripten_async_wget2
>>> emscripten_async_wget_data
>>> emscripten_async_wget2_data
>>>
>>> Regards
>>> Sergey
>>>
>>>
>>> On Thu, Nov 13, 2014 at 1:24 PM, Sergey Kurdakov <[email protected]>
>>> wrote:
>>>
>>>> Hi Alexandar.
>>>>
>>>> won't emscripten_async_wget serve your needs? it sends requests to
>>>> server and params can adjast which type of request is sent.
>>>>
>>>> Regards
>>>> Sergey
>>>>
>>>> On Thu, Nov 13, 2014 at 11:58 AM, Aleksandar Stančić <[email protected]
>>>> > wrote:
>>>>
>>>>> Hi! I'm writing a game in C++/OGL (to be published on the web through
>>>>> Emscripten) that needs some interaction with a server, written in
>>>>> PHP/MySQL. I already prepared the database and PHP code, and now, the
>>>>> surprisingly difficult part is connecting the two. Is there a simple way
>>>>> of
>>>>> loading a web page with a few POST strings in C++/Emscripten?
>>>>> Two-to-three
>>>>> strings go in (POST) and I need to read one string or integer on the
>>>>> output
>>>>> (HTTP response). emscripten_wget just hangs on me, and mixing JS + C++
>>>>> seems to be able to transfer only numbers (ASM). Can someone point me in
>>>>> the right direction? I feel like I'm missing something obvious, and I
>>>>> wouldn't really know, since I'm not much of a web developer. Thanks.
>>>>>
>>>>> Just to clarify, I have a PHP page like this:
>>>>>
>>>>> $a = $_POST['a'] // a and b need to come from C++
>>>>> $b = $_POST['b']
>>>>>
>>>>>
>>>>>
>>>>> // do stuff with $a & $b
>>>>>
>>>>>
>>>>> echo($c) // a string, under 100 regular ASCII chars, nothing special
>>>>>
>>>>> So, I need to do a HTTP POST request (I can switch to GET if that'll
>>>>> make things easier), and read a single line of text back into C++. What
>>>>> would be a good way of doing that? I hate to be *that guy**,* but it
>>>>> is kind urgent (I really wrote myself into a corner with this one, I
>>>>> expected this to be easy), so any tips are greatly appreciated.
>>>>>
>>>>> --
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>>>>>
>>>>
>>>>
>>> --
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>
>
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