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【程序】C++使用WinHttp发送HTTP请求，然后用MSXML6解析从服务器获得的XML内容 |
 一派护法 十九级 |
【功能】 调用Arslanbar2.0 API获取并显示最新的25个主题帖的标题。 【程序运行结果】  |
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一派护法 十九级 |
【C++代码】
// HTTP.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
#include <sstream>
#include <comutil.h>
#include <MsXml6.h>
#include <Windows.h>
#include <Winhttp.h>
#pragma comment(lib, "comsuppw.lib")
#pragma comment(lib, "msxml6.lib")
#pragma comment(lib, "Winhttp.lib")
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
IXMLDOMDocument *pXMLDoc;
CoCreateInstance(CLSID_DOMDocument60, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pXMLDoc));
HINTERNET hSession = WinHttpOpen(L"A WinHTTP Example Program/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, NULL);
if (hSession)
{
HINTERNET hConnect = WinHttpConnect(hSession, L"zh.arslanbar.net", INTERNET_DEFAULT_HTTP_PORT, NULL);
HINTERNET hRequest = WinHttpOpenRequest(hConnect, NULL, L"API?variant=zh-cn&query=posts", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_REFRESH);
WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, NULL, WINHTTP_NO_REQUEST_DATA, NULL, NULL, NULL);
BOOL bResult = WinHttpReceiveResponse(hRequest, NULL);
if (bResult)
{
// 获取网页内容，以UTF-8编码存储到stream中
DWORD dwRead = 0;
DWORD dwSize;
stringstream stream;
while (WinHttpQueryDataAvailable(hRequest, &dwSize), dwSize > 0)
{
char *buffer = new char[dwSize];
WinHttpReadData(hRequest, buffer, dwSize, &dwRead);
stream.write(buffer, dwSize);
delete[] buffer;
}
// 将UTF-8转换为UTF-16，再转换为BSTR
string data = stream.str();
stream.clear();
dwSize = MultiByteToWideChar(CP_UTF8, NULL, data.c_str(), -1, NULL, NULL);
LPWSTR w_data = new WCHAR[dwSize];
MultiByteToWideChar(CP_UTF8, NULL, data.c_str(), -1, w_data, dwSize);
data.clear();
BSTR b_data = SysAllocString(w_data);
delete[] w_data;
// 用MSXML6解析XML字符串
VARIANT_BOOL flag;
pXMLDoc->loadXML(b_data, &flag);
SysFreeString(b_data);
if (flag == VARIANT_TRUE)
{
// 解析成功
IXMLDOMElement *root;
IXMLDOMNodeList *children;
long i, length;
pXMLDoc->get_documentElement(&root);
root->get_childNodes(&children);
children->get_length(&length);
cout << "共有" << length - 1 << "个主题: " << endl;
for (i = 1; i < length; i++)
{
IXMLDOMNode *post_node;
IXMLDOMNode *title_node;
BSTR b_title;
children->get_item(i, &post_node);
post_node->get_firstChild(&title_node);
title_node->get_text(&b_title);
string title = bstr_t(b_title);
cout << title << endl;
SysFreeString(b_title);
title_node->Release();
post_node->Release();
}
children->Release();
root->Release();
}
else
cout << "解析XML字符串失败" << endl;
}
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
}
else
cout << "Error " << GetLastError() << " in WinHttpOpen." << endl;
WinHttpCloseHandle(hSession);
pXMLDoc->Release();
CoUninitialize();
std::system("pause");
return 0;
}
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一派护法 十九级 |
【C++代码2：不使用bstr_t类】
// HTTP.cpp : 定义控制台应用程序的入口点。
//
#include "stdafx.h"
#include <iostream>
#include <sstream>
#include <comutil.h>
#include <MsXml6.h>
#include <Windows.h>
#include <Winhttp.h>
#pragma comment(lib, "comsuppw.lib")
#pragma comment(lib, "msxml6.lib")
#pragma comment(lib, "Winhttp.lib")
using namespace std;
int _tmain(int argc, _TCHAR* argv[])
{
HRESULT hr = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);
IXMLDOMDocument *pXMLDoc;
CoCreateInstance(CLSID_DOMDocument60, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pXMLDoc));
HINTERNET hSession = WinHttpOpen(L"A WinHTTP Example Program/1.0", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, NULL);
if (hSession)
{
HINTERNET hConnect = WinHttpConnect(hSession, L"zh.arslanbar.net", INTERNET_DEFAULT_HTTP_PORT, NULL);
HINTERNET hRequest = WinHttpOpenRequest(hConnect, NULL, L"API?variant=zh-cn&query=posts", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_REFRESH);
WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, NULL, WINHTTP_NO_REQUEST_DATA, NULL, NULL, NULL);
BOOL bResult = WinHttpReceiveResponse(hRequest, NULL);
if (bResult)
{
// 获取网页内容，以UTF-8编码存储到stream中
DWORD dwRead = 0;
DWORD dwSize;
stringstream stream;
while (WinHttpQueryDataAvailable(hRequest, &dwSize), dwSize > 0)
{
char *buffer = new char[dwSize];
WinHttpReadData(hRequest, buffer, dwSize, &dwRead);
stream.write(buffer, dwSize);
delete[] buffer;
}
// 将UTF-8转换为UTF-16，再转换为BSTR
string data = stream.str();
stream.clear();
dwSize = MultiByteToWideChar(CP_UTF8, NULL, data.c_str(), -1, NULL, NULL);
LPWSTR w_data = new WCHAR[dwSize];
MultiByteToWideChar(CP_UTF8, NULL, data.c_str(), -1, w_data, dwSize);
data.clear();
BSTR b_data = SysAllocString(w_data);
delete[] w_data;
// 用MSXML6解析XML字符串
VARIANT_BOOL flag;
pXMLDoc->loadXML(b_data, &flag);
SysFreeString(b_data);
if (flag == VARIANT_TRUE)
{
// 解析成功
IXMLDOMElement *root;
IXMLDOMNodeList *children;
long i, length;
pXMLDoc->get_documentElement(&root);
root->get_childNodes(&children);
children->get_length(&length);
cout << "共有" << length - 1 << "个主题: " << endl;
for (i = 1; i < length; i++)
{
IXMLDOMNode *post_node;
IXMLDOMNode *title_node;
BSTR b_title;
children->get_item(i, &post_node);
post_node->get_firstChild(&title_node);
title_node->get_text(&b_title);
char *title = _com_util::ConvertBSTRToString(b_title);
cout << title << endl;
delete[] title;
SysFreeString(b_title);
title_node->Release();
post_node->Release();
}
children->Release();
root->Release();
}
else
cout << "解析XML字符串失败" << endl;
}
WinHttpCloseHandle(hRequest);
WinHttpCloseHandle(hConnect);
}
else
cout << "Error " << GetLastError() << " in WinHttpOpen." << endl;
WinHttpCloseHandle(hSession);
pXMLDoc->Release();
CoUninitialize();
std::system("pause");
return 0;
}
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