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headers_received.cpp
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59 lines (48 loc) · 1.95 KB
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// Copyright 2016 The Emscripten Authors. All rights reserved.
// Emscripten is available under two separate licenses, the MIT license and the
// University of Illinois/NCSA Open Source License. Both these licenses can be
// found in the LICENSE file.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <emscripten/fetch.h>
void readyStateChange(emscripten_fetch_t *fetch)
{
if(fetch->readyState != 2) return;
size_t headersLengthBytes = emscripten_fetch_get_response_headers_length(fetch) + 1;
char *headerString = new char[headersLengthBytes];
assert(headerString);
emscripten_fetch_get_response_headers(fetch, headerString, headersLengthBytes);
printf("Got headers: %s\n", headerString);
char **responseHeaders = emscripten_fetch_unpack_response_headers(headerString);
assert(responseHeaders);
delete[] headerString;
int numHeaders = 0;
for(; responseHeaders[numHeaders * 2]; ++numHeaders)
{
// Check both the header and its value are present.
assert(responseHeaders[(numHeaders * 2) + 1]);
printf("Got response header: %s:%s\n", responseHeaders[numHeaders * 2], responseHeaders[(numHeaders * 2) + 1]);
}
printf("Finished receiving %d headers from URL %s.\n", numHeaders, fetch->url);
emscripten_fetch_free_unpacked_response_headers(responseHeaders);
}
void success(emscripten_fetch_t *fetch)
{
printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
// The data is now available at fetch->data[0] through fetch->data[fetch->numBytes-1];
emscripten_fetch_close(fetch); // Free data associated with the fetch.
}
int main()
{
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY | EMSCRIPTEN_FETCH_REPLACE;
attr.onsuccess = success;
attr.onreadystatechange = readyStateChange;
attr.timeoutMSecs = 2*60;
emscripten_fetch(&attr, "myfile.dat");
return 0;
}