初学vc望 recv函数返回值的有关问题

初学vc望高手指点 recv函数返回值的问题
该程序编译连接运行时无错，可是总得不到预期的结果。在其中ReadFTPServerReply中的recv函数总是返回-1。下面程序已经注明！！

#include <stdlib.h>
#include <winsock.h>

#define   PROG_NAME   "Simple   FTP "
#define   HOST_NAME   "FTPSERVER.COM.CN "
#define   PASSWORD     "PASS   guest\r\n "
#define   WINSOCK_VERSION   0x0101
#define   DEFAULT_PROTOCOL   0
#define   NO_FLAGS   0

char   szCommandBuffer[100];
LPSTR   lpszFunctionName;

UINT   GetReplyCode(LPSTR   lpszServerReply)     //   4
{
UINT   nCode;
char   c;

c   =   *(lpszServerReply+3);
*(lpszServerReply+3)   =   '\0 ';
nCode   =   atoi((const   char   *)lpszServerReply);
*(lpszServerReply+3)   =   c;
return(nCode);
}

UINT   ReadFTPServerReply(SOCKET   hControlChannel)     //二   1   1   1
{
char   sReceiveBuffer[1024];
int     iLength;

lpszFunctionName   =   "ReadFTPServerReply ";         //二   1   1   1

//此时recv（）总是返回-1

if((iLength   =   recv(hControlChannel,(LPSTR)sReceiveBuffer,
sizeof(sReceiveBuffer),NO_FLAGS))==SOCKET_ERROR)                   {
int   iWinsockErr   =   WSAGetLastError();
wsprintf(szCommandBuffer, "Error   %d   from   the   recv()   function!! ",iWinsockErr);
MessageBeep(MB_ICONHAND);
MessageBox(NULL,szCommandBuffer,lpszFunctionName,MB_OK|MB_ICONSTOP);
return(999);

}

sReceiveBuffer[iLength]= '\0 ';
MessageBeep(MB_ICONASTERISK);
MessageBox(NULL,(LPSTR)sReceiveBuffer,lpszFunctionName,MB_OK|MB_ICONINFORMATION);
return(GetReplyCode(sReceiveBuffer));

}

UINT   SendFTPCommand(SOCKET   hControlChannel,LPSTR   szCommandBuffer)       //二   1   1
{
lpszFunctionName   =   "SendFTPCommand ";

if((send(hControlChannel,(LPSTR)szCommandBuffer,lstrlen(szCommandBuffer),NO_FLAGS))==SOCKET_ERROR)
{
int   iWinsockErr   =   WSAGetLastError();
wsprintf(szCommandBuffer, "Error   %d   from   the   send()   function!! ",iWinsockErr);
MessageBeep(MB_ICONHAND);
MessageBox(NULL,szCommandBuffer,lpszFunctionName,MB_OK|MB_ICONSTOP);
return(999);

}

return(ReadFTPServerReply(hControlChannel));       //二   1   1   1
}

UINT   AnonymousFTPLogIn(SOCKET   hControlSocket)       //二   1
{
int   nReplyCode;
int   iMsg   =   0;

lpszFunctionName   =   "AnonymousFTPLogIn ";     //二   1

char   *LoginCommand[]   =   { "USER   anonymous\r\n ",PASSWORD,NULL};

do
{
nReplyCode   =   SendFTPCommand(hControlSocket,(LPSTR)LoginCommand[iMsg++]);     //二   1   1  

}
while(LoginCommand[iMsg]&&nReplyCode <400);

return(nReplyCode);

}

SOCKET   ConnectFTPControlSocket(LPSTR   lpszHost)     //   一   1
{
LPHOSTENT   lpHostEnt;
SOCKADDR_IN   sockAddr;
LPSERVENT   lpServEnt;
short   nProtocolPort;