C / C++ / MFC

10-Jul-06 1:58

Hi,
Iam sending data to ComPort and using RS-232 cable Iam trying to receive the data at the other end.
I set the properties also(BaudRate,Stop Bits,Parity etc..)both at sender and receiver.

Sending End:
char dataToSend[100];
dataToSend = "asdfsdf ....";
result = WriteFile(handlePort,dataToSend,99,&length,NULL);

Receiving End:
char dataReceived[100];
result = ReadFile(handlePort,dataReceived,99,&length,NULL);
cout << "Data Received = " << dataReceived<

David Crow10-Jul-06 2:53

David Crow

10-Jul-06 2:53

Ayesha Farheen wrote:
result = ReadFile(handlePort,dataReceived,99,&length,NULL);

What is the value of result? If it is FALSE, what is the return value of GetLastError()?

What is the value of length?

"The largest fire starts but with the smallest spark." - David Crow

"Judge not by the eye but by the heart." - Native American Proverb

Ayesha Farheen10-Jul-06 3:28

10-Jul-06 3:28

At both sending and receiving ends , its returning 1 (TRUE).

Ayesha

Re: Data not received properly using COM Port [modified]

earl10-Jul-06 4:37

earl

10-Jul-06 4:37

And length? What happens if you flush the buffer?

Ayesha Farheen10-Jul-06 20:29

10-Jul-06 20:29

Before sending the data or receiving it , Iam flushing the buffer using following method.

int nReturnValue = PurgeComm(handlePort_,PURGE_TXCLEAR | PURGE_RXCLEAR);

And the return value is non-zero, i.e flushing succeded.
I checked both, with and without PurgeComm(). But still its not working.i.e Output is same for both.

And the length received is coming as 0.
I didnt understand one thing, Iam sending the data only ones, but why its receiving it those many times and why data is not coming?

Thank You.

Ayesha

-- modified at 2:54 Tuesday 11th July, 2006

earl11-Jul-06 3:55

earl

11-Jul-06 3:55

Flush the buffer after sending the data using FlushFileBuffers. This ensures that nothing gets stuck in a buffer waiting to send.

If you are sending the data only once but the remote end is receiving it many times, make sure you have your line enders right -- it could be that the remote end is getting confused. Try 13 10, just 10, and just 13 -- I can never remember which of those are the usual line enders.

earl

Cool Ju10-Jul-06 21:03

Cool Ju

10-Jul-06 21:03

Ayesha wrote:
result = WriteFile(handlePort,parameterNCheckSumData,99,&length,NULL);

What is parameterNCheckSumData? Should'nt it be dataToSend.

Adios,
Cool Ju Cool | :cool:

Dream Ur Destiny

Ayesha Farheen10-Jul-06 22:04

10-Jul-06 22:04

Yes , that is dataToSend its not parameterNCheckSumData. But thats just a char buffer name. I want to know why data is not being received properly.

Thanku You.

Ayesha

Cool Ju10-Jul-06 23:12

Cool Ju

10-Jul-06 23:12

Hi,

What type of I/O are you performing Overlapped or Non-overlapped?
Have you set timeouts? If not, Try setting timeouts.

If possible post some code.

Adios,
Cool Ju Cool | :cool:

Dream Ur Destiny

Adding ActiveX

Semion_N10-Jul-06 1:39

10-Jul-06 1:39

Hello,
I added an ActiveX to my application but when I gave the program to other people the activeX isn't there...
How can I add/paste the ActiveX to my program so if i'll give it to another people it will work.

SnaidiS(Semion)

RockyJames10-Jul-06 1:42

RockyJames

10-Jul-06 1:42

It has to be registered in others systems too,to whome u give,then it will work..

Semion_N10-Jul-06 1:52

Re: Adding ActiveX [modified]

10-Jul-06 1:52

I added ActiveX from this article: http://www.codeproject.com/miscctrl/ntgraph_activex.asp[^]
They wrote that I have to add this function DllRegisterServer();
to register the activeX.
but where do I add it?
In which class? without parameters?

SnaidiS(Semion)

Naveen10-Jul-06 1:43

Naveen

10-Jul-06 1:43

u must supply the activex alone with ur exe and Register that exe in the target mechine. Its good if u appoint a Installer for this purpose.

nave

Semion_N10-Jul-06 3:19

10-Jul-06 3:19

How can I get the handle of object?

SnaidiS(Semion)

Abhi Lahare10-Jul-06 3:42

Abhi Lahare

10-Jul-06 3:42

regsvr32 [path_to_your_activex_dll]

Semion_N10-Jul-06 4:14

10-Jul-06 4:14

I wrote a code to register the activeX but when I'm giving the program to anither computer it can't find the activeX

SnaidiS(Semion)

Abhi Lahare10-Jul-06 18:57

Abhi Lahare

10-Jul-06 18:57

try using IPropertyBag interface.

Regards
Abhishake Lahare

Abhi Lahare10-Jul-06 18:58

Abhi Lahare

10-Jul-06 18:58

Sorry implement IPropertyBag for your control

Regards
Abhishake Lahare