效果：
在IDC_EDIT_HTTP_INPUT 输入http请求
在IDC_EDIT_HTTP_OUTPUT 反馈返回数据json格式的
void CTG_HelperDlg::OnBnClickedButtonSubmit(){CString str;GetDlgItem(IDC_EDIT_HTTP_INPUT)->GetWindowText(str);AppendToOutput(str); CString rsp = L"";CString post_data = L"";ExecuteRequest( L"GET", str, post_data, rsp );TRACE("rsp:%s",rsp);}void CTG_HelperDlg::AppendToOutput(CString str){ str = _T("rn") + str;CEdit* http_output_editbox = (CEdit*)GetDlgItem(IDC_EDIT_HTTP_OUTPUT);//在末尾添加内容int nCount = 0;int nLastLineStart = 0;int nLastLineEnd = 0;nCount = http_output_editbox->GetLineCount(); //获取行数，包括回车行//MessageBox(nCount);nLastLineStart = http_output_editbox->LineIndex( nCount - 1 ); //获取字符数，许可多行nLastLineEnd = nLastLineStart + http_output_editbox->LineLength(nLastLineStart);http_output_editbox->SetSel( nLastLineEnd + 1, nLastLineEnd + 2 ); //设定光标选中的区域http_output_editbox->ReplaceSel( str); //文字替换TRACE(L"nsend [%s] to engine",str);//MessageBox(str);}CString CTG_HelperDlg::ExecuteRequest( LPCTSTR strMethod, LPCTSTR strUrl, CString strPostData, CString &strResponse ){ CString strServer; CString strObject; DWORD dwServiceType; INTERNET_PORT nPort; strResponse = _T(""); CString strState = _T(""); AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort); //解析url //判断协议类型是否为http或https if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType) { //LoggerCio::notice(LoggerCio::LOG_URL,"*** url 非http或https 协议！");//log输出 return _T("不是http协议"); } try { //CHttpConnection *m_pConnection;//定义在头文件 //获取 CHttpConnection* m_pConnection = sess.GetHttpConnection(strServer ,nPort); //获取 CHttpFile* m_pFile = m_pConnection->OpenRequest(strMethod, strObject,NULL, 1, NULL, NULL,INTERNET_FLAG_EXISTING_CONNECT); m_pFile -> AddRequestHeaders( _T("Accept:application/json;")); m_pFile -> AddRequestHeaders( _T("Content-Type:application/json;charset=utf-8;")); m_pFile -> AddRequestHeaders( _T("Content-Type:multipart/form-data;")); USES_CONVERSION; char *pData = T2A(strPostData); if (NULL == m_pFile) { //LOG_FUNC_QUIT_DEBUG(LOG_SYS); return _T("Open Error！"); } //发送请求 if(m_pFile->SendRequest(NULL, 0,pData,strlen(pData))) { char szChars[BUFFER_SIZE + 1] = {0};std::string strRawResponse = ""; UINT nReaded = 0; CString str = _T(""); while ((nReaded = m_pFile->Read((void*)szChars, BUFFER_SIZE)) > 0) {//接收返回 szChars[nReaded] = ' '; strRawResponse += szChars; str = strRawResponse.c_str(); //strResponse = CallBackState(str, strPostData);//AfxMessageBox(str, MB_ICONINFORMATION); strState = strResponse; memset(szChars, 0, BUFFER_SIZE + 1); }AppendToOutput(str); //将多字符转宽字节存为 CString int unicodeLen = MultiByteToWideChar(CP_UTF8, 0, strRawResponse.c_str(), -1, NULL, 0); WCHAR *pUnicode = new WCHAR[unicodeLen + 1]; memset(pUnicode,0,(unicodeLen+1)*sizeof(wchar_t)); MultiByteToWideChar(CP_UTF8,0,strRawResponse.c_str(),-1, pUnicode,unicodeLen); CString cs(pUnicode); delete []pUnicode; pUnicode = NULL; strResponse = cs; return strState; //成功 } else{//请求失败打印错误码 DWORD dwError = GetLastError(); //LoggerCio::notice(LoggerCio::LOG_URL,"*** m_pFile->SendRequest 失败，GetLastError=%d",dwError); return _T("请求失败"); //错误 } } catch (CInternetException* e) { //捕获CInternetException异常 DWORD dwErrorCode = e->m_dwError; e->Delete(); e = NULL; strState = _T("4"); DWORD dwError = GetLastError(); return strState; }}
参考：
MFC通过Http Post数据到Web端
MFC发送HTTP请求