借鑒了網上的，忘記是在哪里看到的了。 增加了對HTTPS的支持。用到了MFC的CString，可以自行修改無需MFC。直接貼代碼：

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WebClient.h:

#pragma once #include <Windows.h> #include <winhttp.h> #pragma comment(lib, "Winhttp.lib") #include <vector>#ifdef _DLL #ifndef _AFXDLL #error 需要MFC支持! #endif #endif#ifndef _UNICODE #error 只能用于UNICODE項目中! #endif//小型動態緩沖區 //僅支持基本數據類型 template<typename T> class DynamicBuffer {enum {DEFAULT_SIZE = 32000, //默認初始大小GROW_SIEZ = 32000, //每次增長大小}; private:T *m_pData;size_t m_nData;size_t m_nBuffer; public:explicit DynamicBuffer(const T *pData = NULL, size_t nData = 0);//允許用右值構造DynamicBuffer(const DynamicBuffer &&RValue);//允許用右值賦值DynamicBuffer& operator = (const DynamicBuffer &&RValue);~DynamicBuffer();//追加數據void Append(const T *pData, size_t nData);//清空所有數據,恢復默認構造后的狀態void Clear();//釋放所有內存，一般在不再使用時才調用bool Release();//獲取保存的數據大小size_t Size(){return m_nData;}const T* Data(){return m_pData;}operator const T*(){return m_pData;} private:DynamicBuffer(const DynamicBuffer&);DynamicBuffer& operator = (const DynamicBuffer&); };class WebClient { public:enum RetCode {SUCCESS = 0,INVALID_URL = 1,WINHTTP_ERROR = 2,INTERNET_ERROR = 3,TIMEOUT_ERROR = 4,CREATE_FILE_ERROR = 5,};enum {ANSI = 1,UTF8 = 2,}; private:HINTERNET m_hSession;CStringW m_strUserAgent;int m_CharSet; public:explicit WebClient(LPCWSTR wszUserAgent = L"Mozilla/5.0");~WebClient();//清理Cookie，重置會話void ClearAll();//發起GET請求，獲取頁面HTMLRetCode Get(LPCWSTR wszUrl, CStringW &strHtml,int iCnt = 0);RetCode GetEx(LPCWSTR wszUrl, const CStringW &strHead, CStringW &strHtml,int iCnt = 0);RetCode GetEx(LPCWSTR wszUrl, const std::vector<CStringW> &vec_strHead, CStringW &strHtml,int iCnt =0);//發起POST請求，獲取返回的HTMLRetCode Post(LPCWSTR wszUrl, const CStringW &strPostData, CStringW &strHtml);RetCode PostEx(LPCWSTR wszUrl, const CStringW &strPostData, const CStringW &strHead, CStringW &strHtml);RetCode PostEx(LPCWSTR wszUrl, const CStringW &strPostData, const std::vector<CStringW> &vec_strHead, CStringW &strHtml);//下載文件RetCode DownloadFile(LPCWSTR wszUrl, LPCWSTR wszFilePath);//設置超時值bool SetTimeouts(DWORD dwConnectTimeout, DWORD dwTransmissionTimeout);//設置代理bool SetProxy(const CStringW &strProxy);//取消代理bool RemoveProxy();//設置目標網站編碼，默認為UTF8bool CharSet(int iCharSet); private:enum {MAX_URL_LENGTH = 2084,TEMP_BUFFER_SIZE = 4096,//4000,};//分析URLbool ParseUrl(LPCWSTR wszUrl, int &iProtocol, WORD &nPort, CStringW &strHostName, CStringW &strUrlPath);//編碼轉換CStringW UTF8ToUTF16(LPCSTR szUTF8, int nLen = -1);CStringW AnsiToUTF16(LPCSTR szAnsi, int nLen = -1);CStringA UTF16ToUTF8(LPCWSTR wszUTF16, int nLen = -1);private:WebClient(const WebClient&);WebClient& operator = (const WebClient&); };

　　WebClient.cpp:

#include "stdafx.h" #include "WebClient.h"#ifdef _DEBUG #define new DEBUG_NEW #endif//小型動態緩沖區 template<typename T> DynamicBuffer<T>::DynamicBuffer(const T *pData /*=NULL*/, size_t nData /*=0*/) {ASSERT(!(!pData && nData != 0));if (nData > DEFAULT_SIZE)m_nBuffer = nData + GROW_SIEZ;elsem_nBuffer = DEFAULT_SIZE;m_pData = (T*)malloc(m_nBuffer * sizeof(T));memset(m_pData, 0, m_nBuffer * sizeof(T));if (pData)memcpy_s(m_pData, m_nBuffer * sizeof(T), pData, nData * sizeof(T));m_nData = nData; }//允許用右值構造 template<typename T> DynamicBuffer<T>::DynamicBuffer(const DynamicBuffer &&RValue) {m_pData = RValue.m_pData;m_nData = RValue.m_nData;m_nBuffer = RValue.m_nBuffer; }//允許用右值賦值 template<typename T> DynamicBuffer<T>& DynamicBuffer<T>::operator = (const DynamicBuffer &&RValue) {if (m_pData)free(m_pData);m_pData = RValue.m_pData;m_nData = RValue.m_nData;m_nBuffer = RValue.m_nBuffer;return *this; }template<typename T> DynamicBuffer<T>::~DynamicBuffer() {Release(); }//追加數據 template<typename T> void DynamicBuffer<T>::Append(const T *pData, size_t nData) {ASSERT(!(pData == NULL && nData != 0));if (nData > m_nBuffer - m_nData){//需要重新分配內存size_t nNewBuffer = 0;if (nData > GROW_SIEZ)nNewBuffer = m_nData + nData + GROW_SIEZ;elsenNewBuffer = m_nBuffer + GROW_SIEZ;m_pData = (T*)realloc(m_pData, nNewBuffer * sizeof(T));memset(m_pData + m_nBuffer, 0, (nNewBuffer - m_nBuffer) * sizeof(T));m_nBuffer = nNewBuffer;}memcpy_s(m_pData + m_nData, (m_nBuffer - m_nData) * sizeof(T), pData, nData * sizeof(T));m_nData += nData; }//釋放所有內存，一般在不再使用時才調用 template<typename T> bool DynamicBuffer<T>::Release() {if (m_pData){free(m_pData);m_pData = NULL;m_nData = 0;m_nBuffer = 0;return true;}elsereturn false; }//清空所有數據,恢復默認構造后的狀態 template<typename T> void DynamicBuffer<T>::Clear() {if (m_pData && m_nBuffer == DEFAULT_SIZE){//已經是默認構造后的大小，清空下數據即可memset(m_pData, 0, m_nBuffer);m_nData = 0;return;}if (m_pData)free(m_pData);m_pData = (T*)malloc(DEFAULT_SIZE * sizeof(T));memset(m_pData, 0, DEFAULT_SIZE * sizeof(T));m_nBuffer = DEFAULT_SIZE;m_nData = 0; }WebClient::WebClient(LPCWSTR wszUserAgent /*= L"Mozilla/5.0"*/) {ASSERT(wszUserAgent != NULL);m_CharSet = UTF8;m_strUserAgent = wszUserAgent;m_hSession = WinHttpOpen(m_strUserAgent, WINHTTP_ACCESS_TYPE_NO_PROXY,WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, NULL);//自動跟蹤所有重定向DWORD dwOption = WINHTTP_OPTION_REDIRECT_POLICY_ALWAYS;BOOL bSuccessSet = WinHttpSetOption(m_hSession, WINHTTP_OPTION_REDIRECT_POLICY, &dwOption, sizeof(DWORD));ASSERT(m_hSession != NULL && bSuccessSet); }WebClient::~WebClient() {if (m_hSession)WinHttpCloseHandle(m_hSession); }//清理Cookie，重置會話 void WebClient::ClearAll() {if (m_hSession)WinHttpCloseHandle(m_hSession);m_hSession = WinHttpOpen(m_strUserAgent, WINHTTP_ACCESS_TYPE_NO_PROXY,WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, NULL);//自動跟蹤所有重定向DWORD dwOption = WINHTTP_OPTION_REDIRECT_POLICY_ALWAYS;BOOL bSuccessSet = WinHttpSetOption(m_hSession, WINHTTP_OPTION_REDIRECT_POLICY, &dwOption, sizeof(DWORD));ASSERT(m_hSession != NULL && bSuccessSet); }//發起GET請求，獲取頁面HTML WebClient::RetCode WebClient::Get(LPCWSTR wszUrl, CStringW &strHtml,int iCnt) {return GetEx(wszUrl, L"", strHtml,iCnt); }WebClient::RetCode WebClient::GetEx(LPCWSTR wszUrl, const CStringW &strHead, CStringW &strHtml,int iCnt) {std::vector<CStringW> vec_strHead;if (!strHead.IsEmpty())vec_strHead.push_back(strHead);return GetEx(wszUrl, vec_strHead, strHtml,iCnt); }WebClient::RetCode WebClient::GetEx(LPCWSTR wszUrl, const std::vector<CStringW> &vec_strHead, CStringW &strHtml,int iCnt) {ASSERT(wszUrl != NULL);//解析URLint iProtocal;WORD nPort;CStringW strHostName, strUrlPath;if (!ParseUrl(wszUrl, iProtocal, nPort, strHostName, strUrlPath))return INVALID_URL;HINTERNET hConnect = WinHttpConnect(m_hSession, strHostName, nPort, NULL);if (!hConnect)return WINHTTP_ERROR;//不接受緩存DWORD dwFlags = WINHTTP_FLAG_REFRESH;if (iProtocal == INTERNET_SCHEME_HTTPS){dwFlags |= WINHTTP_FLAG_SECURE;}HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", strUrlPath, NULL,WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, dwFlags);if (!hRequest){WinHttpCloseHandle(hConnect);return WINHTTP_ERROR;}////添加請求頭 FOR HTTPSDWORD dwBuffLen = sizeof(dwFlags); WinHttpQueryOption (hRequest, WINHTTP_OPTION_SECURITY_FLAGS,(LPVOID)&dwFlags, &dwBuffLen);dwFlags |= SECURITY_FLAG_IGNORE_UNKNOWN_CA;dwFlags |= SECURITY_FLAG_IGNORE_CERT_DATE_INVALID;dwFlags |= SECURITY_FLAG_IGNORE_CERT_CN_INVALID;// dwFlags |= SECURITY_FLAG_IGNORE_CERT_WRONG_USAGE;WinHttpSetOption (hRequest, WINHTTP_OPTION_SECURITY_FLAGS,&dwFlags, sizeof (dwFlags) );end//for (size_t i=0; i<vec_strHead.size(); i++){if (!vec_strHead[i].IsEmpty()){WinHttpAddRequestHeaders(hRequest, vec_strHead[i],-1L, WINHTTP_ADDREQ_FLAG_ADD|WINHTTP_ADDREQ_FLAG_REPLACE);}}////發送請求if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, NULL, WINHTTP_NO_REQUEST_DATA, NULL, NULL, NULL)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}//接收內容if (!WinHttpReceiveResponse(hRequest, NULL)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}//讀出內容DynamicBuffer<char> DyBuffData;char *pTempBuffer = new char[TEMP_BUFFER_SIZE];DWORD dwRead = 0;//寫入文件FILE *fp;char name[64];ZeroMemory(name,64);//這邊我所請求的數據是已知的jpg圖片sprintf(name,"%d.jpg",iCnt);if ((fp = fopen(name, "ab+")) == NULL) // 存儲圖片return CREATE_FILE_ERROR;do {memset(pTempBuffer, 0, TEMP_BUFFER_SIZE);if (!WinHttpReadData(hRequest, pTempBuffer, TEMP_BUFFER_SIZE, &dwRead)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;delete [] pTempBuffer;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}dwRead > 0?fwrite(pTempBuffer, dwRead,1 ,fp):NULL;DyBuffData.Append(pTempBuffer, dwRead);} while (dwRead > 0);delete [] pTempBuffer;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);//關閉文件fclose(fp);//進行編碼轉換if (m_CharSet == UTF8){strHtml = UTF8ToUTF16(DyBuffData, DyBuffData.Size());}else{strHtml = AnsiToUTF16(DyBuffData, DyBuffData.Size());}return SUCCESS; }//下載文件 WebClient::RetCode WebClient::DownloadFile(LPCWSTR wszUrl, LPCWSTR wszFilePath) {ASSERT(wszUrl != NULL && wszFilePath != NULL);//解析URLint iProtocal;WORD nPort;CStringW strHostName, strUrlPath;if (!ParseUrl(wszUrl, iProtocal, nPort, strHostName, strUrlPath))return INVALID_URL;HINTERNET hConnect = WinHttpConnect(m_hSession, strHostName, nPort, NULL);if (!hConnect)return WINHTTP_ERROR;//不接受緩存DWORD dwFlags = WINHTTP_FLAG_REFRESH;if (iProtocal == INTERNET_SCHEME_HTTPS)dwFlags |= WINHTTP_FLAG_SECURE;HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", strUrlPath, NULL,WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, dwFlags);if (!hRequest){WinHttpCloseHandle(hConnect);return WINHTTP_ERROR;}//發送請求if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, NULL, WINHTTP_NO_REQUEST_DATA, NULL, NULL, NULL)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}//接收內容if (!WinHttpReceiveResponse(hRequest, NULL)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}//讀出內容，寫入到文件CFile File;if (!File.Open(wszFilePath, CFile::modeCreate|CFile::modeWrite|CFile::shareDenyWrite)){WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return CREATE_FILE_ERROR;}char *pTempBuffer = new char[TEMP_BUFFER_SIZE];DWORD dwRead = 0;do {memset(pTempBuffer, 0, TEMP_BUFFER_SIZE);if (!WinHttpReadData(hRequest, pTempBuffer, TEMP_BUFFER_SIZE, &dwRead)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;delete [] pTempBuffer;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);//未下載完，網絡異常，刪除文件File.Close();::DeleteFileW(wszFilePath);return retcode;}File.Write(pTempBuffer, dwRead);} while (dwRead > 0);delete [] pTempBuffer;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);File.Close();return SUCCESS; }//發起POST請求，獲取返回的HTML WebClient::RetCode WebClient::Post(LPCWSTR wszUrl, const CStringW &strPostData, CStringW &strHtml) {return PostEx(wszUrl, strPostData, L"", strHtml); }WebClient::RetCode WebClient::PostEx(LPCWSTR wszUrl, const CStringW &strPostData, const CStringW &strHead, CStringW &strHtml) {std::vector<CStringW> vec_strHead;if (!strHead.IsEmpty())vec_strHead.push_back(strHead);return PostEx(wszUrl, strPostData, vec_strHead, strHtml); }WebClient::RetCode WebClient::PostEx(LPCWSTR wszUrl, const CStringW &strPostData, const std::vector<CStringW> &vec_strHead, CStringW &strHtml) {ASSERT(wszUrl != NULL);//解析URLint iProtocal;WORD nPort;CStringW strHostName, strUrlPath;if (!ParseUrl(wszUrl, iProtocal, nPort, strHostName, strUrlPath))return INVALID_URL;HINTERNET hConnect = WinHttpConnect(m_hSession, strHostName, nPort, NULL);if (!hConnect)return WINHTTP_ERROR;//不接受緩存DWORD dwFlags = WINHTTP_FLAG_REFRESH;if (iProtocal == INTERNET_SCHEME_HTTPS)dwFlags |= WINHTTP_FLAG_SECURE;HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"POST", strUrlPath, NULL,WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, dwFlags);if (!hRequest){WinHttpCloseHandle(hConnect);return WINHTTP_ERROR;}//添加POST必備的請求頭WinHttpAddRequestHeaders(hRequest, L"Content-Type: application/x-www-form-urlencoded",-1L, WINHTTP_ADDREQ_FLAG_ADD|WINHTTP_ADDREQ_FLAG_REPLACE);//添加其它請求頭for (size_t i=0; i<vec_strHead.size(); i++){if (!vec_strHead[i].IsEmpty()){WinHttpAddRequestHeaders(hRequest, vec_strHead[i],-1L, WINHTTP_ADDREQ_FLAG_ADD|WINHTTP_ADDREQ_FLAG_REPLACE);}}//轉換編碼CStringA strPostData_utf8 = UTF16ToUTF8(strPostData);//發送請求if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, NULL, (LPSTR)(LPCSTR)strPostData_utf8, strPostData_utf8.GetLength(), strPostData_utf8.GetLength(), NULL)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}//接收內容if (!WinHttpReceiveResponse(hRequest, NULL)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}//讀出內容DynamicBuffer<char> DyBuffData;char *pTempBuffer = new char[TEMP_BUFFER_SIZE];DWORD dwRead = 0;do {memset(pTempBuffer, 0, TEMP_BUFFER_SIZE);if (!WinHttpReadData(hRequest, pTempBuffer, TEMP_BUFFER_SIZE, &dwRead)){DWORD dwErrorCode = GetLastError();RetCode retcode;if (dwErrorCode == ERROR_WINHTTP_NAME_NOT_RESOLVED || dwErrorCode == ERROR_WINHTTP_CANNOT_CONNECT ||dwErrorCode == ERROR_WINHTTP_INVALID_SERVER_RESPONSE || dwErrorCode == ERROR_WINHTTP_CONNECTION_ERROR)retcode = INTERNET_ERROR;else if (dwErrorCode == ERROR_WINHTTP_TIMEOUT)retcode = TIMEOUT_ERROR;elseretcode = WINHTTP_ERROR;delete [] pTempBuffer;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);return retcode;}DyBuffData.Append(pTempBuffer, dwRead);} while (dwRead > 0);delete [] pTempBuffer;WinHttpCloseHandle(hRequest);WinHttpCloseHandle(hConnect);//進行編碼轉換if (m_CharSet == UTF8)strHtml = UTF8ToUTF16(DyBuffData, DyBuffData.Size());elsestrHtml = AnsiToUTF16(DyBuffData, DyBuffData.Size());return SUCCESS; }//分析URL bool WebClient::ParseUrl(LPCWSTR wszUrl, int &iProtocol, WORD &nPort, CStringW &strHostName, CStringW &strUrlPath) {ASSERT(wszUrl != NULL);WCHAR *wszHostName = new WCHAR[MAX_URL_LENGTH+1];WCHAR *wszUrlPath = new WCHAR[MAX_URL_LENGTH+1];memset(wszHostName, 0 , MAX_URL_LENGTH+1);memset(wszUrlPath, 0, MAX_URL_LENGTH+1);URL_COMPONENTS urlComp = {sizeof(URL_COMPONENTS)};urlComp.lpszHostName = wszHostName;urlComp.dwHostNameLength = MAX_URL_LENGTH;urlComp.lpszUrlPath = wszUrlPath;urlComp.dwUrlPathLength = MAX_URL_LENGTH;BOOL bSuccessParse = WinHttpCrackUrl(wszUrl, NULL, NULL, &urlComp);if (bSuccessParse){iProtocol = urlComp.nScheme;nPort = urlComp.nPort;strHostName = urlComp.lpszHostName;strUrlPath = urlComp.lpszUrlPath;}delete [] wszHostName;delete [] wszUrlPath;if (bSuccessParse)return true;elsereturn false; }//編碼轉換 CStringW WebClient::UTF8ToUTF16(LPCSTR szUTF8, int nLen /*= -1*/) {//先獲取轉換后需要的緩沖區大小DWORD nWszLen = MultiByteToWideChar(CP_UTF8, NULL, szUTF8, nLen, NULL, NULL);CStringW strUTF16;nWszLen = MultiByteToWideChar(CP_UTF8, NULL, szUTF8, nLen, strUTF16.GetBuffer(nWszLen), nWszLen);strUTF16.ReleaseBuffer(nWszLen);return strUTF16; }CStringW WebClient::AnsiToUTF16(LPCSTR szAnsi, int nLen /*= -1*/) {//先獲取轉換后需要的緩沖區大小DWORD nWszLen = MultiByteToWideChar(CP_ACP, NULL, szAnsi, nLen, NULL, NULL);CStringW strUTF16;nWszLen = MultiByteToWideChar(CP_ACP, NULL, szAnsi, nLen, strUTF16.GetBuffer(nWszLen), nWszLen);strUTF16.ReleaseBuffer(nWszLen);return strUTF16; }CStringA WebClient::UTF16ToUTF8(LPCWSTR wszUTF16, int nLen /*= -1*/) {//先獲取轉換后需要的緩沖區大小DWORD nszLen = WideCharToMultiByte(CP_UTF8, NULL, wszUTF16, nLen, NULL, NULL, NULL, NULL);CStringA strUTF8;nszLen = WideCharToMultiByte(CP_UTF8, NULL, wszUTF16, nLen, strUTF8.GetBuffer(nszLen), nszLen, NULL, NULL);strUTF8.ReleaseBuffer(nszLen);return strUTF8; }//設置超時值 bool WebClient::SetTimeouts(DWORD dwConnectTimeout, DWORD dwTransmissionTimeout) {if (WinHttpSetTimeouts(m_hSession, 0, dwConnectTimeout, dwTransmissionTimeout, dwTransmissionTimeout))return true;elsereturn false; }//設置代理 bool WebClient::SetProxy(const CStringW &strProxy) {WINHTTP_PROXY_INFO ProxyInfo = {WINHTTP_ACCESS_TYPE_NAMED_PROXY,(LPWSTR)(LPCWSTR)strProxy, (LPWSTR)(LPCWSTR)strProxy};if (WinHttpSetOption(m_hSession, WINHTTP_OPTION_PROXY, &ProxyInfo, sizeof(WINHTTP_PROXY_INFO)))return true;elsereturn false; }//取消代理 bool WebClient::RemoveProxy() {WINHTTP_PROXY_INFO ProxyInfo = {WINHTTP_ACCESS_TYPE_NO_PROXY, NULL, NULL};if (WinHttpSetOption(m_hSession, WINHTTP_OPTION_PROXY, &ProxyInfo, sizeof(WINHTTP_PROXY_INFO)))return true;elsereturn false; }//設置目標網站編碼 bool WebClient::CharSet(int iCharSet) {if (iCharSet != ANSI && iCharSet != UTF8)return false;m_CharSet = iCharSet;return true; }

　　調用：

?

WebClient webclient;g_iCnt = 0;CString strHtml;//請求12306的圖片為例webclient.Get(_T("https://kyfw.12306.cn/otn/passcodeNew/getPassCodeNew?module=login&rand=sjrand&0.7099142521619793"), strHtml,g_iCnt);

　　

轉載于:https://www.cnblogs.com/LandAll/p/4465219.html

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