MFC 通過 http (post/get) 訪問WEB(介面)伺服器,並取得伺服器返回資料
阿新 • • 發佈:2019-01-25
關鍵系統函式
CHttpConnection* CInternetSession::GetHttpConnection
CHttpFile* CHttpConnection::OpenRequest
CHttpFile::SendRequest
CInternetFile::Read
訪問介面函式
//strMethod:型別包含 POST/GET ,strUrl訪問的網址,strPostData:型別為POST時提交給伺服器的資料,strResponse:伺服器返回資料
int CHttpData::ExecuteRequest(LPCTSTR strMethod, LPCTSTR strUrl, CString/*LPCTSTR*/ strPostData, CString &strResponse)
{
CString strServer;
CString strObject;
DWORD dwServiceType;
INTERNET_PORT nPort;
strResponse = _T("");
CInternetSession sess;//Create session
AfxParseURL(strUrl, dwServiceType, strServer, strObject, nPort); //解析url
//判斷協議型別是否為http或https
if(AFX_INET_SERVICE_HTTP != dwServiceType && AFX_INET_SERVICE_HTTPS != dwServiceType)
{
LoggerCio::notice(LoggerCio::LOG_URL,"*** url 非http或https 協議!");//log輸出
return FAILURE;
}
try
{ //CHttpConnection *m_pConnection;//定義在標頭檔案
//獲取 CHttpConnection*
m_pConnection = sess.GetHttpConnection(strServer,dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_CONNECT : SECURE_CONNECT,nPort);
//獲取 CHttpFile*
m_pFile = m_pConnection->OpenRequest(strMethod, strObject,NULL, 1, NULL, NULL,(dwServiceType == AFX_INET_SERVICE_HTTP ? NORMAL_REQUEST : SECURE_REQUEST));
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 FAILURE;
}
//傳送請求
if(m_pFile->SendRequest(NULL, 0,pData,strlen(pData)))
{
char szChars[BUFFER_SIZE + 1] = {0};
string strRawResponse = "";
UINT nReaded = 0;
while ((nReaded = m_pFile->Read((void*)szChars, BUFFER_SIZE)) > 0)
{//接收返回
szChars[nReaded] = '\0';
strRawResponse += szChars;
memset(szChars, 0, BUFFER_SIZE + 1);
}
//將多字元轉寬位元組存為 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;
}
else{//請求失敗列印錯誤碼
DWORD dwError = GetLastError();
LoggerCio::notice(LoggerCio::LOG_URL,"*** m_pFile->SendRequest 失敗,GetLastError=%d",dwError);
}
Clear();
}
catch (CInternetException* e)
{ //捕獲CInternetException異常
Clear();
DWORD dwErrorCode = e->m_dwError;
e->Delete();
e = NULL;
DWORD dwError = GetLastError();
LoggerCio::notice(LoggerCio::LOG_URL,"*** CHttpData 網路異常,錯誤程式碼[CInternetException::m_dwError:%d][GetLastError:%d] ***",dwErrorCode,dwError);
if (ERROR_INTERNET_TIMEOUT == dwErrorCode)
return OUTTIME; //超時
else
return FAILURE; //錯誤
}
return SUCCESS; //成功
}