Hi Guys ,

I'm trying to convert some vc++ to xBase++ but have a problem with how to 
define the tx and rx buffers in xbase to call the dl's.
Following is the Visual C code with its buffer definitions for tx and 
rx.....Then I show my attemp in the xbase code.
Can someone tell me if I am right or wrong because all runs well ...but I do 
not get the results expected.

Kind regards
Nestor


SAMPLE Visual C++ code:
===============================
unsigned char tx[600], rx[600];
DWORD BytesWritten, AmountInRxQueue, BytesReturned;

//Ping the port and check for correct response
tx[1] = 0x30;//0
tx[2] = 0x31;//1
tx[3] = 0x30;//0
tx[4] = 0x38;//8
tx[5] = 0x30;//0
tx[6] = 0x30;//0
tx[7] = 0x30;//0
tx[8] = 0x33;//3
tx[9] = 0x30;//0
tx[10] = 0x34;//4
tx[11] = 0x46;//F
tx[12] = 0x46;//F
tx[13] = 0x30;//0
tx[14] = 0x30;//0
tx[15] = 0x30;//0
tx[16] = 0x30;//0

FT_Write(m_ftHandle, tx, 16, &BytesWritten);   //pos and byteswritten = 16
FT_GetQueueStatus(m_ftHandle, &AmountInRxQueue);  //amountinrxqueue 
...indicates how many bytes in buffer
FT_Read(m_ftHandle, rx, AmountInRxQueue, &BytesReturned);  && reponse back 
into rx

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@


SAMPLE xBase Code:
==================
**Note all dll calls have previously been prepared
Local ctx:= "0108000304FF0000"+Space(584)   && Transmit buffer
Local crx:= Space(600)  && Receive buffer
Local nBytesWritten:=0, nAmountInRxQueue:=0, nBytesReturned:=0

DllExecuteCall( FT_Write         , nFTDevice_Handle, ctx ,16, 
@nBytesWritten)
DllExecuteCall( FT_GetQueueStatus, nFTDevice_Handle, @nAmountInRxQueue)
DllExecuteCall( FT_Read, nFTDevice_Handle, @crx, nAmountInRxQueue, 
@nBytesReturned)

Hi,

Just 1 diference betwen the C++ and the Xbase++ code

PRG: Local ctx:= "0108000304FF0000" + ...  string start at position 0 of the buffer !!!!
cpp: tx[1] = 0x30;//0    string start at position 1 of the buffer !!!!!!

tx[600] is not initialitzed so position 0 of the buffer can contain just anything. At first look seems that your Xbase++ code is OK but the C++ sample is wrong, unless you found anything in the docs that told you that the first byte must be reserved for any special purpose.

Regards,
Pablo

Hi Pablo,

Thank you....Maybe I have made a mistake because I thought I would simplyfy 
the the example. The original:
Question what would be the index value for the first index possition tx 
[pos++] and  and if I where to use pos instead of 16 in the FT_write what 
would the value of pos be.

My guess is that the first tx[pos++] ( pos would equal 0)....then pos would 
be equal to 16 if I were to use it in the FT_Write call function.

Thanking you in antisipation.
Nestor

unsigned char tx[600], rx[600];
DWORD BytesWritten, AmountInRxQueue, BytesReturned;
 int pos=0;
//Ping the port and check for correct response
tx[pos++] = 0x30;//0
tx[pos++] = 0x31;//1
tx[pos++] = 0x30;//0
tx[pos++] = 0x38;//8
tx[pos++] = 0x30;//0
tx[pos++] = 0x30;//0
tx[pos++] = 0x30;//0
tx[pos++] = 0x33;//3
tx[pos++] = 0x30;//0
tx[pos++] = 0x34;//4
tx[pos++] = 0x46;//F
tx[pos++] = 0x46;//F
tx[pos++] = 0x30;//0
tx[pos++] = 0x30;//0
tx[pos++] = 0x30;//0
tx[pos++] = 0x30;//0

FT_Write(m_ftHandle, tx, 16, &BytesWritten);   //pos and byteswritten = 16
FT_GetQueueStatus(m_ftHandle, &AmountInRxQueue);  //amountinrxqueue
...indicates how many bytes in buffer
FT_Read(m_ftHandle, rx, AmountInRxQueue, &BytesReturned);  && reponse back
into rx

"Pablo Botella" <pb_no_spam_@_remove_all_betwen_underscores_xbwin.com> wrote 
in message news:6281971e$69ad1cfe$4c4f6@news.alaska-software.com...
> Hi,
>
> Just 1 diference betwen the C++ and the Xbase++ code
>
> PRG: Local ctx:= "0108000304FF0000" + ...  string start at position 0 of 
> the buffer !!!!
> cpp: tx[1] = 0x30;//0    string start at position 1 of the buffer !!!!!!
>
> tx[600] is not initialitzed so position 0 of the buffer can contain just 
> anything. At first look seems that your Xbase++ code is OK but the C++ 
> sample is wrong, unless you found anything in the docs that told you that 
> the first byte must be reserved for any special purpose.
>
> Regards,
> Pablo

tx[0] = 0x30; pos = 0+1
....
and finally
tx[15] = 0x30; pos = 15 + 1

So pos = the length of the string