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[英]Http_client post request using C++ REST SDK (Casablanca)
[英]C++ REST SDK Casablanca Client.request
我想编写一个小 C++ 程序,向服务器发送请求并获取一些数据。 我找到了 C++ Rest-SDK 并决定使用它。 我在不同的网站上搜索了代码示例,但其中许多都不起作用并显示语法错误。 我现在得到的是该代码,但跳过了 client.request 方法。 该程序永远不会跳进来。希望有人能意识到这个问题,也许可以解释我必须改变的地方。
#include <Windows.h>
#include <iostream>
#include <sstream>
#include <string>
#include "cpprest/containerstream.h"
#include "cpprest/filestream.h"
#include "cpprest/http_client.h"
#include "cpprest/json.h"
#include "cpprest/producerconsumerstream.h"
#include "cpprest/http_client.h"
#include <string.h>
#include <conio.h>
using namespace std;
using namespace web;
using namespace web::json;
using namespace web::http;
using namespace web::http::client;
using namespace utility;
using namespace utility::conversions;
int main() {
http_client client(L"http://httpbin.org/ip");
client.request(methods::GET).then([](http_response response)
{
if(response.status_code() == status_codes::OK)
{
auto body = response.extract_string().get();
std::wcout << body;
getch();
}
});
return 0;
}
主线程可能在“请求”任务完成之前终止,因此您看不到任何控制台输出。 我建议你在“.then”之后调用任务“wait()”函数,就像他们网站上的答案一样
您的程序在main
的末尾运行并终止。 您需要在then
调用后添加wait
:
client.request(methods::GET).then([](http_response response)
{
// ...
}).wait();
此代码正在工作:
// ConsoleApplication1.cpp : Defines the entry point for the console application.
#include "StdAfx.h"
#include <cpprest/http_client.h>
#include <cpprest/filestream.h>
using namespace utility; // Common utilities like string conversions
using namespace web; // Common features like URIs.
using namespace web::http; // Common HTTP functionality
using namespace web::http::client; // HTTP client features
using namespace concurrency::streams; // Asynchronous streams
int main(int argc, char* argv[])
{
// Make the request and asynchronously process the response.
http_client client(L"http://localhost:8082/TPJAXRS/Test/test");
client.request(methods::GET).then([](http_response response){
if(response.status_code() == status_codes::OK){
auto body = response.extract_string().get();
std::wcout << body<< std::endl;
}});
std::cout << "Hello world!" << std::endl;
system("PAUSE");
return 0;
}
#include <cpprest/http_client.h>
#include <cpprest/filestream.h>
#include <cpprest/http_listener.h> // HTTP server
#include <cpprest/json.h> // JSON library
#include <cpprest/uri.h> // URI library
#include <cpprest/ws_client.h> // WebSocket client
#include <cpprest/containerstream.h> // Async streams backed by STL containers
#include <cpprest/interopstream.h> // Bridges for integrating Async streams with STL and WinRT streams
#include <cpprest/rawptrstream.h> // Async streams backed by raw pointer to memory
#include <cpprest/producerconsumerstream.h> // Async streams for producer consumer scenarios
using namespace utility; // Common utilities like string conversions
using namespace web; // Common features like URIs.
using namespace web::http; // Common HTTP functionality
using namespace web::http::client; // HTTP client features
using namespace concurrency::streams; // Asynchronous streams
using namespace web::http::experimental::listener; // HTTP server
using namespace web::experimental::web_sockets::client; // WebSockets client
using namespace web::json; // JSON library
int main(int argc, char* argv[])
{
auto fileStream = std::make_shared<ostream>();
// Open stream to output file.
pplx::task<void> requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)
{
*fileStream = outFile;
// Create http_client to send the request.
http_client client(U("http://www.bing.com/"));
// Build request URI and start the request.
uri_builder builder(U("/search"));
builder.append_query(U("q"), U("cpprestsdk github"));
return client.request(methods::GET, builder.to_string());
})
// Handle response headers arriving.
.then([=](http_response response)
{
printf("Received response status code:%u\n", response.status_code());
// Write response body into the file.
return response.body().read_to_end(fileStream->streambuf());
})
// Close the file stream.
.then([=](size_t)
{
return fileStream->close();
});
// Wait for all the outstanding I/O to complete and handle any exceptions
try
{
requestTask.wait();
}
catch (const std::exception &e)
{
printf("Error exception:%s\n", e.what());
}
return 0;
}
这是用于在 HTTP 请求中设置的
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