在vc中如何用post方法提交表单

最新推荐文章于 2019-10-24 11:03:23 发布

原创最新推荐文章于 2019-10-24 11:03:23 发布 · 3.2k 阅读

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#delete #internet #mfc #null #session #buffer

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本文介绍如何利用MFC和WinInet API实现HTTP请求过程，包括发送POST请求、读取响应数据，并将结果展示在对话框中。示例代码详细展示了创建连接、设置请求头、发送请求数据及接收响应的步骤。

我这里有一段程序，用来在一个对话框里显示出一次http request的原始信息，不过使用Inet API做的，希望能有帮助。

// Allocates a buffer of the size returned by InternetQueryDataAvailable lpszData = new char[dwSize+1]; // Reads the data from the HINTERNET handle. if(!InternetReadFile(hRequest,(LPVOID)lpszData,dwSize,&dwDownloaded)) { delete[] lpszData; break; } else { // Adds a null terminator to the end of the data buffer lpszData[dwDownloaded]='/0'; int nLen = m_editContentGot.GetWindowTextLength(); m_editContentGot.SetSel(nLen-1, nLen-1); m_editContentGot.ReplaceSel(lpszData); // Delete the two buffers delete[] lpszData; // Check the size of the remaining data. If it is zero, break. if (dwDownloaded == 0) break; } } } // Close the HINTERNET handle InternetCloseHandle(hRequest); InternetCloseHandle(hSession); InternetCloseHandle(hInternet); // Set the cursor back to an arrow SetCursor(LoadCursor(NULL,IDC_ARROW));

使用MFC示例如下:
首先设置m_strRequest请求字符串 eg."name=aaa&pass=bbb";
m_strServerName 服务器名称或者IP eg."www.yahoo.com"
m_strObjectName 请求文件位置 eg. "pub/aaa.asp"
请求的结果存放在m_strHtml中

func(){ CInternetSession m_InetSession("session"); CHttpConnection* pServer = NULL; CHttpFile* pFile = NULL; try{ INTERNET_PORT nPort; nPort=80; pServer = m_InetSession.GetHttpConnection(m_strServerName, nPort); pFile = pServer->OpenRequest(CHttpConnection::HTTP_VERB_POST, m_strObjectName); char szHeaders[100]; strcpy(szHeaders,"Accept: text*/*/r/nContent-Type: application/x-www-form-urlencoded"); pFile->AddRequestHeaders(szHeaders); pFile->SendRequestEx(m_strRequest.GetLength()); pFile->WriteString(m_strRequest); //重要-->m_Request 中有"name=aaa&name2=BBB&..." pFile->EndRequest(); DWORD dwRet; pFile->QueryInfoStatusCode(dwRet); CString str; m_Mutex.Lock(); m_strHtml=""; char szBuff[1024]; if (dwRet == HTTP_STATUS_OK){ UINT nRead; while ((nRead = pFile->Read(szBuff,1023))>0) { m_strHtml+=CString(szBuff,nRead); } } m_Mutex.Unlock(); delete pFile; delete pServer; } catch (CInternetException* e){ CString s; s.Format("Internet Exception/r/nm_dwError%u,m_dwContextError%u",e->m_dwError,e->m_dwContext); AfxMessageBox(s); //catch errors from WinInet }