oscilloscope connected to rs232 port

[gintare]

Hello,
OS win98,
BorlandC++Builder5,

Serial oscilloscope is connected to PC with null-modem cable to rs232 port
as modem.I want to send commands and read waweform.

1) Then using TekVisa draiver for oscilloscope i have compilling error.
2) My code in WinAPI does work with port (I can open it and setup),
But i don`t find funcion analogous for viOpen above to get Handle for Oscilloscope.

Q: how must i open session with oscilloscope.

1) Then using TekVisa draiver for oscilloscope i have compilling error.
My code is copied line by line. It gives errors Unresolved external
viOpennDefaultRM... viOpen....viClose (Include and Library paths are included
corectly):

#include"visa.h"
#include<iostream.h>

int main(int argc, char* argv[])
{
ViStatus status;
ViSession defaultRM, instr;

status=viOpenDefaultRM(&defaultRM); //Open port

status=viOpen(defaultRm, "VX10::16::INSTR", VI_NULL,
VI_NULL,&instr); //Open Oscillograph

viClose(instr);
viClose(defaultRM);

return 0;
}

2) My code in WinAPI does work with port (I can open it and setup),
But i don`t find funcion analogous for viOpen above to get Handle for Oscilloscope.

#include<windows.h>
#include<winbase.h>
#include<iostream.h>
#include<assert.h>

#define READ_TIMEOUT 1000
#define WRITE_TIMEOUT 1000

using std::cout;
using std::cin;

void setup_rs232(HANDLE hComm,DCB* dcbPtr, COMMTIMEOUTS *ctmoPtr);
int write_rs232(HANDLE hComm, char* str);
int read_rs232(HANDLE hComm);
int ErrorExit(LPTSTR lpszFunction);

DWORD dwInQueue;
DWORD dwOutQueue;
DCB dcb={0};
COMMTIMEOUTS ctmo={0};

int main()
{
HANDLE hComm;

hComm=CreateFile("COM1",GENERIC_READ|GENERIC_WRITE,
0,0,OPEN_EXISTING,FILE_FLAG_OVERLAPPED,0);
if(hComm==INVALID_HANDLE_VALUE) ErrorExit("CreateFile");

if (! PurgeComm(hComm, PURGE_TXCLEAR | PURGE_RXCLEAR) )
ErrorExit("PurgeComm");

setup_rs232(hComm,&dcb,&ctmo); // fill DCB and COMMTIMEOTS functions

if (write_rs232(hComm,"*IDN?\n")) return 0; //trying to send command to
oscilloscope. I have error her - invalide handle

read_rs232(hComm); //trying to read answer-string with manfacture name..

CloseHandle(&hComm);

cin>>end_char;

return 0;
}

Thanks in advance!!!!