Donatien Garnier
Networking stack: HTTP Client Streaming example
HttpClientStreamingExample.cpp@1:0e4f1cc78052, 2010-05-27 (annotated)
- Committer:
- donatien
- Date:
- Thu May 27 11:18:24 2010 +0000
- Revision:
- 1:0e4f1cc78052
- Parent:
- 0:b6b9d1b95cc7
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| donatien | 0:b6b9d1b95cc7 | 1 | #include "mbed.h" |
| donatien | 0:b6b9d1b95cc7 | 2 | #include "EthernetNetIf.h" |
| donatien | 0:b6b9d1b95cc7 | 3 | #include "HttpClient.h" |
| donatien | 0:b6b9d1b95cc7 | 4 | |
| donatien | 0:b6b9d1b95cc7 | 5 | EthernetNetIf eth; |
| donatien | 0:b6b9d1b95cc7 | 6 | HttpClient http; |
| donatien | 0:b6b9d1b95cc7 | 7 | |
| donatien | 0:b6b9d1b95cc7 | 8 | HttpResult result; |
| donatien | 0:b6b9d1b95cc7 | 9 | bool completed = false; |
| donatien | 0:b6b9d1b95cc7 | 10 | void request_callback(HttpResult r) |
| donatien | 0:b6b9d1b95cc7 | 11 | { |
| donatien | 0:b6b9d1b95cc7 | 12 | result = r; |
| donatien | 0:b6b9d1b95cc7 | 13 | completed = true; |
| donatien | 0:b6b9d1b95cc7 | 14 | } |
| donatien | 0:b6b9d1b95cc7 | 15 | |
| donatien | 0:b6b9d1b95cc7 | 16 | int main() { |
| donatien | 0:b6b9d1b95cc7 | 17 | |
| donatien | 0:b6b9d1b95cc7 | 18 | printf("Start\n"); |
| donatien | 0:b6b9d1b95cc7 | 19 | |
| donatien | 0:b6b9d1b95cc7 | 20 | printf("\r\nSetting up...\r\n"); |
| donatien | 0:b6b9d1b95cc7 | 21 | EthernetErr ethErr = eth.setup(); |
| donatien | 0:b6b9d1b95cc7 | 22 | if(ethErr) |
| donatien | 0:b6b9d1b95cc7 | 23 | { |
| donatien | 0:b6b9d1b95cc7 | 24 | printf("Error %d in setup.\n", ethErr); |
| donatien | 0:b6b9d1b95cc7 | 25 | return -1; |
| donatien | 0:b6b9d1b95cc7 | 26 | } |
| donatien | 0:b6b9d1b95cc7 | 27 | printf("\r\nSetup OK\r\n"); |
| donatien | 0:b6b9d1b95cc7 | 28 | |
| donatien | 0:b6b9d1b95cc7 | 29 | HttpStream stream; |
| donatien | 0:b6b9d1b95cc7 | 30 | |
| donatien | 1:0e4f1cc78052 | 31 | char BigBuf[512 + 1] = {0}; |
| donatien | 1:0e4f1cc78052 | 32 | stream.readNext((byte*)BigBuf, 512); //Point to buffer for the first read |
| donatien | 0:b6b9d1b95cc7 | 33 | |
| donatien | 1:0e4f1cc78052 | 34 | HttpResult r = http.get("http://hackaday.com/feed/", &stream, request_callback); //Load a very large page, such as the hackaday RSS feed |
| donatien | 0:b6b9d1b95cc7 | 35 | |
| donatien | 0:b6b9d1b95cc7 | 36 | while(!completed) |
| donatien | 0:b6b9d1b95cc7 | 37 | { |
| donatien | 1:0e4f1cc78052 | 38 | Net::poll(); //Polls the Networking stack |
| donatien | 0:b6b9d1b95cc7 | 39 | if(stream.readable()) |
| donatien | 0:b6b9d1b95cc7 | 40 | { |
| donatien | 1:0e4f1cc78052 | 41 | BigBuf[stream.readLen()] = 0; //Transform this buffer is zero-terminated char* string |
| donatien | 1:0e4f1cc78052 | 42 | printf("%s",BigBuf); //Displays it while loading |
| donatien | 1:0e4f1cc78052 | 43 | //Note: some server do not like if you throttle them too much, so printf'ing during a request is generally bad practice |
| donatien | 1:0e4f1cc78052 | 44 | stream.readNext((byte*)BigBuf, 512); //Buffer has been read, now we can put more data in it |
| donatien | 0:b6b9d1b95cc7 | 45 | } |
| donatien | 0:b6b9d1b95cc7 | 46 | } |
| donatien | 0:b6b9d1b95cc7 | 47 | printf("\r\n--------------\r\n"); |
| donatien | 0:b6b9d1b95cc7 | 48 | if(result == HTTP_OK) |
| donatien | 0:b6b9d1b95cc7 | 49 | { |
| donatien | 0:b6b9d1b95cc7 | 50 | printf("Read completely\n"); |
| donatien | 0:b6b9d1b95cc7 | 51 | } |
| donatien | 0:b6b9d1b95cc7 | 52 | else |
| donatien | 0:b6b9d1b95cc7 | 53 | { |
| donatien | 1:0e4f1cc78052 | 54 | printf("Error %d\n", result); |
| donatien | 0:b6b9d1b95cc7 | 55 | } |
| donatien | 0:b6b9d1b95cc7 | 56 | |
| donatien | 0:b6b9d1b95cc7 | 57 | while(1) |
| donatien | 0:b6b9d1b95cc7 | 58 | { |
| donatien | 0:b6b9d1b95cc7 | 59 | |
| donatien | 0:b6b9d1b95cc7 | 60 | } |
| donatien | 0:b6b9d1b95cc7 | 61 | |
| donatien | 0:b6b9d1b95cc7 | 62 | return 0; |
| donatien | 0:b6b9d1b95cc7 | 63 | |
| donatien | 0:b6b9d1b95cc7 | 64 | } |