计算机科学论坛--一个菜鸟关于完成端口的问题[求助]

我是用delphi编的由于网上只有收数据的模型我想把它该成发送数据的但是却不能发送想请问各位高手哪里出错了谢谢
unit Unit2;

interface
uses Windows, unit1, WinSock, Sysutils;
const
  port=5150;
  data_bufsize=8192;
type
  lpvoid=pointer;
  lpper_io_operation_data=^per_io_operation_data;
  per_io_operation_data=packed record
    overlapped:overlapped;
    databuf:twsabuf;
    buffer:array[0..data_bufsize]of char;
    bytessend:dword;
    bytesrec:dword;
  end;
  lpper_handle_data=^per_handle_data;
  per_handle_data=packed record
    socket:tsocket;
  end;

procedure main;

implementation

function serverworkerthread(completionportid:lpvoid):dword;stdcall;forward;

procedure printf(fmt:string;num:integer);
begin
  writeln(format(fmt,[num]));
end;
procedure main;
var
  internetaddr:sockaddr_in;
  listen:tsocket;
  accept:tsocket;
  completionport:thandle;
  systeminfo:system_info;
  perhandledata:lpper_handle_data;
  periodata:lpper_io_operation_data;
  i:integer;
  recvbytes,sendbytes:dword;
  flags:dword;
  threadid:dword;
  wsadata:twsadata;
  ret:dword;
  threadhandle:thandle;
begin
  ret:=wsastartup($0202,wsadata);
  if (ret<>0) then
  begin
    printf('wsas %d',ret);
    exit;
  end;
  completionport:=createiocompletionPort(INVALID_HANDLE_VALUE,0,0,0);
  if (CompletionPort=0) then
  begin
    printf('createioerror:%d',getlasterror());
    exit;
  end;
  getsysteminfo(systeminfo);
  for i:=0 to systeminfo.dwNumberOfProcessors*2-1 do
  begin
    threadhandle:=createthread(nil,0,@serverworkerthread,pointer(completionport),0,threadid);
    if (threadhandle=0) then
    begin
      printf('c',getlasterror());
      exit;
    end;
    closehandle(threadhandle);
  end;
  listen:=wsasocket(af_inet,sock_stream,0,nil,0,wsa_flag_overlapped);
  if (listen=invalid_socket) then
  begin
    printf('wsa',wsagetlasterror());
    exit;
  end;
  internetaddr.sin_family:=af_inet;
  internetaddr.sin_addr.S_addr:=inet_addr(pchar('192.168.0.2'));
  internetaddr.sin_port:=htons(port);
  perhandledata:=lpper_handle_data(globalalloc(gptr,sizeof(per_handle_data)));
  if (perhandledata=nil) then
  begin
    printf('glo',wsagetlasterror());
    exit;
  end;
  printf('socket numble%d',accept);
  perhandledata.socket:=listen;
  if (createiocompletionport(listen,completionport,dword(perhandledata),0)=0) then
  begin
    printf('createiocp%d',wsagetlasterror());
    exit;
  end;
  periodata:=lpper_io_operation_data(globalalloc(gptr,sizeof(per_io_operation_data)));
  if (periodata=nil) then
  begin
    printf('glo%d',wsagetlasterror());
    exit;
  end;
    zeromemory(@periodata.overlapped,sizeof(overlapped));
    periodata.bytessend:=0;
    periodata.bytesrec:=0;
    periodata.databuf.len:=data_bufsize;
    periodata.buffer:='wudi';
    periodata.databuf.buf:=@periodata.buffer;
    flags:=0;
    if (wsasend(listen,@(periodata.databuf),1,@sendbytes,0,@(periodata.overlapped),nil)=socket_error) then
    begin
      if (wsagetlasterror<>error_io_pending) then
      begin
        printf('wsarecvfailed%d',wsagetlasterror());
        exit;
      end
    end;
  end;

function serverworkerthread(completionportid:lpvoid):dword;stdcall;
var
   CompletionPort: THANDLE;
   BytesTransferred: DWORD ;
   PerHandleData: LPPER_HANDLE_DATA ;
   PerIoData: LPPER_IO_OPERATION_DATA ;
   SendBytes, RecvBytes: DWORD;
   Flags: DWORD ;
begin
  completionport:=thandle(completionportid);
  result:=0;
  while(true) do
  begin
    if (getqueuedcompletionstatus(completionport,bytestransferred,dword(perhandledata),poverlapped(periodata),infinite)=false) then
    begin
      printf('get%d',getlasterror());
      exit;
    end;
    if (bytestransferred=0) then
    begin
      printf('closingsocket%d\',perhandledata.socket);
      if (closesocket(perhandledata.socket)=socket_error) then
      begin
        printf('closesocketerror%d',wsagetlasterror());
        exit;
      end;
      globalfree(dword(perhandledata));
      globalfree(dword(periodata));
      continue;
    end;
    if (periodata.bytesrec=0) and (periodata.bytessend=0) then
    begin
      PerIoData.BytesREC:= BytesTransferred;
      periodata.bytessend:= 0;
    end
    else
    begin
      periodata.bytesrec:=0;
      periodata.bytessend:=bytestransferred;
    end;
    if (periodata.bytesrec>periodata.bytessend) then
    begin
      zeromemory(@(periodata.overlapped),sizeof(overlapped));
      periodata.databuf.buf:= periodata.buffer+periodata.bytessend;
      periodata.databuf.len:= periodata.bytesrec-periodata.bytessend;
      printf(periodata.buffer,periodata.databuf.len);
      if (wsasend(perhandledata.socket,@(periodata.databuf),1,@sendbytes,0,@(periodata.overlapped),nil)=socket_error) then
      begin
        if (wsagetlasterror()<>error_io_pending) then
        begin
          printf('wsasend%d',wsagetlasterror());
          exit
        end;
      end;
    end
    else
    begin
      periodata.bytesrec:= 0;
      flags:= 0;
      zeromemory(@(periodata.overlapped),sizeof(overlapped));
      periodata.databuf.len:= data_bufsize;
      periodata.databuf.buf:= @periodata.buffer;
      if (wsasend(perhandledata.socket,@(periodata.databuf),1,@sendbytes,0,@(periodata.overlapped),nil)=socket_error) then
      begin
        if (wsagetlasterror()<>error_io_pending) then
        begin
          if (wsagetlasterror()<>error_io_pending) then
          begin
            printf('wsa%d',wsagetlasterror());
            exit;
          end;
        end;
      end;
    end;
  end;
end;
end.


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