WinInet和InternetOpen

文档说明可以多次调用InternetOpen而不会出现任何问题。我的问题是,我应该多次调用InternetCloseHandle返回的句柄吗?

例如,我有一个我调用的类 CAPIRequestContext ,它有一个由InternetOpen返回的句柄。我的每个请求都有自己的副本。现在,我在析构函数中调用InternetCloseHandle,因此它被多次调用。

我想知道以下情况是否会导致问题: 线程A创建一个 CAPIRequestObject 它调用InternetOpen并存储句柄。线程B也这样做,但在线程A退出之前就超出了范围,因此线程B在自己的函数中调用析构函数 CAPI请求对象 ,它调用 InternetCloseHandle InternetOpen返回的句柄。

我应该在类的析构函数中删除对InternetCloseHandle的调用吗?至少对于InternetHandle?我假设应该为HttpOpenRequest返回的句柄调用InternetCloseHandle。

关于InternetConnect返回的句柄,我有类似的问题。这些句柄是共享的吗?

下面是一些示例代码,减去一些我认为与问题无关的外部代码:

class CAPIClient;
class CAPIRequest
{
public:
     CAPIRequestContext()
     {
         m_hConn = NULL;
         m_hInternet = NULL;
         m_hRequest = NULL;
     }

     ~CAPIRequestContext()
     {
         if (m_hRequest) InternetCloseHandle(m_hRequest);
         if (m_hConn) InternetCloseHandle(m_hConn);
         if (m_hInternet) InternetCloseHandle(m_hInternet);
     }

     bool Init(const CAPIClient &client, const std::string &uri, const std::string &method)
     {
          ATLASSERT(!(m_hInternet || m_hConn || m_hRequest));
          if (m_hInternet || m_hConn || m_hRequest) throw std::exception("Cannot init request more than once.");

          bool success = false;
          m_AuthToken = *client.m_pAuthToken;
          URI = uri;
          m_hInternet = InternetOpen("MyApp", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, 0);
DWORD requestTimeout = 60 * 1000; // Set timeout to 60 seconds instead of 30

          if (m_hInternet)
          {  
                InternetSetOption(m_hInternet, INTERNET_OPTION_RECEIVE_TIMEOUT, &requestTimeout, sizeof(requestTimeout));
                m_hConn = InternetConnect(m_hInternet, (LPSTR)client.m_host.c_str(), client.m_port, NULL, NULL, INTERNET_SERVICE_HTTP, 0, (DWORD_PTR)this);
                if (m_hConn) {
                      m_hRequest = HttpOpenRequest(m_hConn, method.c_str(), uri.c_str(), "HTTP/1.1", NULL, NULL, client.GetOpenRequestFlags(), 0);
                }
                if (m_hRequest)
                {
                    success = true;
                }
          }
       return success;
     }      
}

    // There are additional calls like 
    // SendRequest
    // GetData
    // GetFullResponse

private:
     // Added these methods to make sure I'm not copying the handles
enter code here
     CAPIRequestContext(const CAPIRequestContext &other) = delete;
     CAPIRequestContext& operator=(const CAPIRequestContext& other) = delete;

private:
      HINTERNET m_hInternet;
      HINTERNET m_hConn;
      HINTERNET m_hRequest;

}