C++ HTTPClient::get方法代码示例

int main() {
    MBED_HOSTTEST_TIMEOUT(15);
    MBED_HOSTTEST_SELECT(default_auto);
    MBED_HOSTTEST_DESCRIPTION(HTTP client hello world);
    MBED_HOSTTEST_START("NET_7");

    char http_request_buffer[BUFFER_SIZE + 1] = {0};
    HTTPClient http;
    EthernetInterface eth;
    eth.init(); //Use DHCP
    eth.connect();

    //GET data
    {
        bool result = true;
        const char *url_hello_txt = "http://developer.mbed.org/media/uploads/donatien/hello.txt";
        printf("HTTP_GET: Trying to fetch page '%s'...\r\n", url_hello_txt);
        HTTPResult ret = http.get(url_hello_txt, http_request_buffer, BUFFER_SIZE);
        if (ret == HTTP_OK) {
            printf("HTTP_GET: Read %d chars: '%s' ... [OK]\r\n", strlen(http_request_buffer), http_request_buffer);
        } else {
            printf("HTTP_GET: Error(%d). HTTP error(%d) ... [FAIL]\r\n", ret, http.getHTTPResponseCode());
            result = false;
        }

        if (result == false) {
            eth.disconnect();
            MBED_HOSTTEST_RESULT(false);
        }
    }

    //POST data
    {
        bool result = true;
        const char *url_httpbin_post = "http://httpbin.org/post";
        HTTPText text(http_request_buffer, BUFFER_SIZE);
        HTTPMap map;
        map.put("Hello", "World");
        map.put("test", "1234");
        printf("HTTP_POST: Trying to post data to '%s' ...\r\n", url_httpbin_post);
        HTTPResult ret = http.post(url_httpbin_post, map, &text);
        if (ret == HTTP_OK) {
            printf("HTTP_POST: Read %d chars ... [OK]\r\n", strlen(http_request_buffer));
            printf("HTTP_POST: %s\r\n", http_request_buffer);
        } else {
            printf("HTTP_GET: Error(%d). HTTP error(%d) ... [FAIL]\r\n", ret, http.getHTTPResponseCode());
            result = false;
        }

        if (result == false) {
            eth.disconnect();
            MBED_HOSTTEST_RESULT(false);
        }
    }
    eth.disconnect();
    MBED_HOSTTEST_RESULT(true);
}

int httptest(CellularModem& modem, const char* apn, const char* username, const char* password)
{
    printf("Connecting...\n");

    HTTPClient http;
    char str[512];

    modem.power(true);
    Thread::wait(1000);
    int ret = modem.connect(apn, username, password);
    if(ret)
    {
      printf("Could not connect\n");
      return false;
    }

    //GET data
    printf("Trying to fetch page...\n");
    ret = http.get("http://mbed.org/media/uploads/donatien/hello.txt", str, 128);
    if (!ret)
    {
      printf("Page fetched successfully - read %d characters\n", strlen(str));
      printf("Result: %s\n", str);
    }
    else
    {
      printf("Error - ret = %d - HTTP return code = %d\n", ret, http.getHTTPResponseCode());
      modem.disconnect();
      return false;
    }

    //POST data
    HTTPMap map;
    HTTPText text(str, 512);
    map.put("Hello", "World");
    map.put("test", "1234");
    printf("Trying to post data...\n");
    ret = http.post("http://httpbin.org/post", map, &text);
    if (!ret)
    {
      printf("Executed POST successfully - read %d characters\n", strlen(str));
      printf("Result: %s\n", str);
    }
    else
    {
      printf("Error - ret = %d - HTTP return code = %d\n", ret, http.getHTTPResponseCode());
      modem.disconnect();
      return false;
    }

    modem.disconnect();
    return true;
}

void test(void const*) 
{
	printf("VodafoneUSBModemHTTPClientTest\n");    
	VodafoneIOModem modem;
	HTTPClient http;
	char str[512];

	int ret = modem.connect("live.vodafone.com");
	if(ret)
	{
		printf("Could not connect\n");
		return;
	}else
		printf("Connected!\n");
	//GET data
	printf("Trying to fetch page...\n");
	ret = http.get("http://developer.mbed.org/media/uploads/donatien/hello.txt", str, 128);
	if (!ret)
	{
		printf("Page fetched successfully - read %d characters\n", strlen(str));
		printf("Result: %s\n", str);
	}
	else
	{
		printf("Error - ret = %d - HTTP return code = %d\n", ret, http.getHTTPResponseCode());
	}

//POST data
	HTTPMap map;
	HTTPText text(str, 512);
	map.put("Hello", "World");
	map.put("test", "1234");
	printf("Trying to post data...\n");
	ret = http.post("http://httpbin.org/post", map, &text);
	if (!ret)
	{
		printf("Executed POST successfully - read %d characters\n", strlen(str));
		printf("Result: %s\n", str);
	}
	else
	{
		printf("Error - ret = %d - HTTP return code = %d\n", ret, http.getHTTPResponseCode());
	}

	modem.disconnect();  
	while(1) {

	}
}

void http_access_test() {
	HTTPClient* httpClient = new HTTPClient();
	
	HTTPHeader* httpHeader = new HTTPHeader();
	
	httpHeader->insert(
		std::string("Content-Type"), 
		std::string("application/x-www-form-urlencoded")
	);
	
	httpHeader->insert(
		std::string("Connection"), 
		std::string("close")
	);
	
	httpClient->get(
		new std::string("http://www.ex-studio.info/"), 
		httpHeader
	);
		
	int status_code = httpClient->status_code();
	std::cout << "Status code: " << status_code << std::endl;
	if(status_code != 200) {
		delete httpHeader;
		delete httpClient;
		return;
	}
	
	HTTPHeader* recvHeader = httpClient->header();
	std::string* recvBody = httpClient->body();
	std::cout << "Date is " << recvHeader->get("Date") << std::endl;
	std::cout << "body: " << *recvBody << std::endl;
	
	delete httpHeader;
	delete httpClient;
	return;
}

int main() {
    
    //initially turn off both the leds.
    //Blue LED will be always on because it shares the connection with the SPI clock
    led_red = 1;
    led_green = 1;

    printf("EECS149 email notifier. \r\n");
    
    wifi.init();
    
    while(1) {
        
        //continuosly check connection status
        //If not connected, try to set up a connection
        if(wifi.is_connected() == false) {
            
            //try to connect
            if (wifi.connect() == -1) {
                printf("Failed to connect. Please verify connection details and try again. \r\n");
            } else {
                printf("IP address: %s \r\n",wifi.getIPAddress());
                
                //once connected, turn green LED on and red LED off
                led_red = 1;
                led_green = 0;  
            }
        } else {
            //if the board is connected, fetch the remote file
            
            printf("\r\nTrying to fetch mail info... \r\n");
            
            //GET remote file data
            int ret = http.get(MAIL_URL, str, 128);
            //analyze ret code
            if (!ret) {
                printf("Page fetched successfully - read %d characters \r\n", strlen(str));
                printf("Result: %s \r\n", str);
                
                num_emails = atoi(str);
                
                if(num_emails == 0) {
                    //no unread emails, turn the green LED on and red LED off
                    led_red = 1;
                    led_green = 0;    
                } else {
                    //unread emails. Turn the green LED off and the red one on
                    led_red = 0;
                    led_green = 1;    
                }
                
                
            } else {
                //error fetching remote file
                printf("Error - ret = %d - HTTP return code = %d \r\n", ret, http.getHTTPResponseCode());
            }
        }
        //poll the remote file every 5 sec
        wait(5.0);
    }
            

}