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Calling a Web Service from a Plugin |
The following examples show how to call a web service using the programming languages that are supported for plugins.
Calling a Web Service in Java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.lang.StringBuilder;
import java.net.URL;
//A simple example that takes a url as an argument and returns the request data in string format.
public class HTTPRequest {
public static String newline = System.getProperty("line.separator");
public static String request(String URLstring) {
StringBuilder output = new StringBuilder();
try {
URL url = new URL(URLstring);
BufferedReader responseReader = new BufferedReader(new InputStreamReader(url.openStream()));
try {
String line;
while ((line = responseReader.readLine()) != null) {
output.append(line);
output.append(newline);
}
}
finally{
responseReader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return output.toString();
}
}
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Calling a Web Service in C#
using System.IO;
using System.Net;
using System.Text;
class HTTPRequest
{
public static string Request(string url)
{
WebRequest request = WebRequest.Create(url);
string content;
using(WebResponse response = request.GetResponse())
{
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8))
{
content = reader.ReadToEnd();
}
}
return content;
}
}
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Calling a Web Service in C++
The following example shows how to call a web service in C++ using the standard Microsoft library:
#include <windows.h>
#include <wininet.h>
int request(char * buffer, int size, LPCWSTR address, LPCWSTR location)
{
HINTERNET hOpen, hConnect, hReq;
hOpen = InternetOpen(_T("anonymous"), INTERNET_OPEN_TYPE_DIRECT, _T(""), _T(""), 0);
if(!hOpen){
return 1;
}
hConnect = InternetConnect(hOpen, address, INTERNET_DEFAULT_HTTP_PORT, _T("anonymous"), _T(""), INTERNET_SERVICE_HTTP, 0, 0);
if(!hConnect){
InternetCloseHandle(hOpen);
return 2;
}
hReq = HttpOpenRequest(hConnect, _T("GET"), location, _T(""), NULL, NULL, INTERNET_FLAG_RELOAD, 0);
if(!hReq){
InternetCloseHandle(hOpen);
InternetCloseHandle(hConnect);
return 3;
}
if(HttpSendRequest(hReq, NULL, 0, NULL, 0))
{
DWORD dwSize = 0;
DWORD dwCode, dwCodeSize;
dwCodeSize = sizeof(DWORD);
if(!HttpQueryInfo(hReq, HTTP_QUERY_STATUS_CODE | HTTP_QUERY_FLAG_NUMBER, &dwCode, &dwCodeSize, NULL))
return 4;
int offset = 0;
int total = 0;
do
{
buffer += offset;
InternetReadFile(hReq, (LPVOID)buffer, 1023, &dwSize);
if(0!=dwSize)
{
offset = dwSize;
total += dwSize;
}
}while (dwSize !=0 && (total + 1024) < size);
++buffer;
*buffer = '\0';
}
InternetCloseHandle(hReq);
InternetCloseHandle(hOpen);
InternetCloseHandle(hConnect);
return 0;
}
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And the following example shows how to call a web service from C++ if you have libcurl installed on your system:
#include <iostream>
#include <string>
#include <curl/curl.h>
using namespace std;
size_t write_to_string(void *ptr, size_t size, size_t count, void *stream) {
((string*)stream)->append((char*)ptr, 0, size*count);
return size*count;
}
string request(const char * url)
{
CURL *curl;
CURLcode res;
string response;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_to_string);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &response);
res = curl_easy_perform(curl);
/* always cleanup */
curl_easy_cleanup(curl);
}
return response;
}
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