delphi - 内存泄漏GETIPFROMHOST

Question

我这里有这段代码，用于从主机名检索 IP 地址:

program Project1;

{$APPTYPE CONSOLE}

uses
  SysUtils,
  winsock;

function GetIPFromHost(const HostName: string): string;
type
  TaPInAddr = array[0..10] of PInAddr;
  PaPInAddr = ^TaPInAddr;
var
  phe: PHostEnt;
  pptr: PaPInAddr;
  i: Integer;
begin
  Result := '';
  phe := GetHostByName(PChar(HostName));
  if phe = nil then Exit;
  pPtr := PaPInAddr(phe^.h_addr_list);
  i := 0;
  while pPtr^[i] <> nil do
  begin
    Result := inet_ntoa(pptr^[i]^);
    Inc(i);
  end;
end;

var
wsaData: TWSAData;

begin

if (WSAStartup($0202, wsaData) <> 0) then begin
      Exit;
end;

while true do begin
sleep (1000);
GetIPFromHost ('localhost');
end;

它工作正常并给了我 IP 地址。不幸的是，我多次需要这个函数来比较 DNS 和 IP 地址。

由于某种原因，我遇到了严重的内存泄漏，并且我的程序的内存增加得非常快。这是为什么？我怎样才能释放内存？

提前致谢。

Answer 1

以下是 GetIPAddress 在 JclSysInfo 中的实现方式:

function GetIPAddress(const HostName: string): string;
var
  R: Integer;
  WSAData: TWSAData;
  HostEnt: PHostEnt;
  Host: string;
  SockAddr: TSockAddrIn;
begin
  Result := '';
  R := WSAStartup(MakeWord(1, 1), WSAData);
  if R = 0 then
  try
    Host := HostName;
    if Host = '' then
    begin
      SetLength(Host, MAX_PATH);
      GetHostName(PChar(Host), MAX_PATH);
    end;
    HostEnt := GetHostByName(PChar(Host));
    if HostEnt <> nil then
    begin
      SockAddr.sin_addr.S_addr := Longint(PLongint(HostEnt^.h_addr_list^)^);
      Result := inet_ntoa(SockAddr.sin_addr);
    end;
  finally
    WSACleanup;
  end;
end;

请注意，您缺少 WSACleanup .

<小时/>

An application or DLL is required to perform a successful WSAStartup call before it can use Windows Sockets services. When it has completed the use of Windows Sockets, the application or DLL must call WSACleanup to deregister itself from a Windows Sockets implementation and allow the implementation to free any resources allocated on behalf of the application or DLL.