怎么修改实现自定义Cookie提交

如何修改实现自定义Cookie提交?
下面是典型的提交变量的单元,可惜不能自定义提价Cookie内容,而它的Cookie内容是随机定义的,我想问,如何修改实现自定义Cookie提交...

unit SendMail;

interface

function HtmlEncode(s: string): string;
function PostURL(const aUrl: string; FTPostQuery: string; const strPostOkResult: string = 'Send OK!'): Boolean;

implementation

uses
  Windows, WinInet;

function HtmlEncode(s: string): string;
var
  i, v1, v2: integer;
  function i2s(b: byte): char;
  begin
  if b <= 9 then result := chr($30 + b)
  else result := chr($41 - 10 + b);
  end;
begin
  result := '';
  for i := 1 to length(s) do
  if s[i] = ' ' then result := result + '+'
  else if (s[i] < ' ') or (s[i] in ['/', '\', ':', '&', '?', '|']) then
  begin
  v1 := ord(s[i]) mod 16;
  v2 := ord(s[i]) div 16;
  result := result + '%' + i2s(v2) + i2s(v1);
  end
  else result := result + s[i]; 
end;

function UpperCase(AStr: string): string; overload;
var
  LI: Integer;
begin
  Result := AStr;
  for LI := 1 to Length(Result) do
  Result[LI] := System.UpCase(Result[LI]);
end;

function RandStr(Length:Integer):String;
var 
  i:Integer;
begin 
  Randomize;
  SetLength(Result,Length);
  for i:=1 to Length do Result[i] := Chr(Random(24) + 97);
end;

//Post方式发信
function PostURL(const aUrl: string; FTPostQuery: string; const strPostOkResult: string = 'Send OK!'): Boolean;
var
  hSession: HINTERNET;
  hConnect, hRequest: hInternet;
  lpBuffer: array[0..1024 + 1] of Char;
  dwBytesRead: DWORD;
  HttpStr: string;
  HostName, FileName: string;
  FTResult: Boolean;
  AcceptType: LPStr;
  Buf: Pointer;
  dwBufLen, dwIndex: DWord;
  procedure ParseURL(URL: string; var HostName, FileName: string);
  procedure ReplaceChar(c1, c2: Char; var St: string);
  var
  p: Integer;
  begin
  while True do
  begin
  p := Pos(c1, St);
  if p = 0 then Break
  else St[p] := c2;
  end;
  end;
  var
  i: Integer;
  begin
  if Pos(UpperCase('http://'), UpperCase(URL)) <> 0 then
  System.Delete(URL, 1, 7);
  i := Pos('/', URL);
  HostName := Copy(URL, 1, i);
  FileName := Copy(URL, i, Length(URL) - i + 1);
  if (Length(HostName) > 0) and (HostName[Length(HostName)] = '/') then
  SetLength(HostName, Length(HostName) - 1);
  end;
begin
  Result := False; // Pchar(RandStr(5)) //'MyApp'
  hSession := InternetOpen(Pchar(RandStr(5)), INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
  try
  if Assigned(hSession) then
  begin
  ParseURL(aUrl, HostName, FileName);
  hConnect := InternetConnect(hSession, PChar(HostName),
  INTERNET_DEFAULT_HTTP_PORT, nil, nil, INTERNET_SERVICE_HTTP, 0, 0);

  AcceptType := PChar('Accept: */*');

  hRequest := HttpOpenRequest(hConnect, 'POST', PChar(FileName), 'HTTP/1.0',
  nil, @AcceptType, INTERNET_FLAG_RELOAD, 0);
  //
  HttpSendRequest(hRequest, 'Content-Type: application/x-www-form-urlencoded', 47,
  PChar(FTPostQuery), Length(FTPostQuery));

  dwIndex := 0;
  dwBufLen := 1024;
  GetMem(Buf, dwBufLen);
  FTResult := HttpQueryInfo(hRequest, HTTP_QUERY_CONTENT_LENGTH,

  Buf, dwBufLen, dwIndex);
  if FTResult = True then
  try
  while True do
  begin
  dwBytesRead := 1024;
  InternetReadFile(hRequest, @lpBuffer, 1024, dwBytesRead);
  if dwBytesRead = 0 then break;
  lpBuffer[dwBytesRead] := #0;
  HttpStr := HttpStr + lpBuffer;
  end;
  MessAgeBox(0,Pchar(HttpStr),'OK',0);
  Result := pos(strPostOkResult {'发送成功'}, HttpStr) > 0;
  //Form1.Memo1.Lines.Add(Httpstr);
  finally
  InternetCloseHandle(hRequest);
  InternetCloseHandle(hConnect);
  end;
  end;
  finally
  InternetCloseHandle(hSession);
  end;
end;
end.

[解决办法]
internetGetCookie
internetSetCookie