Data not received properly using COM Port [modified] - C / C++ / MFC Discussion Boards

Re: Restoring Window - Help.

David Crow10-Jul-06 2:51

David Crow

10-Jul-06 2:51

Programm3r wrote:
How can I get the handle for the second window that has the same name??

Do both windows share the same class name?

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

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

Re: Restoring Window - Help.

Programm3r10-Jul-06 2:57

Programm3r

10-Jul-06 2:57

How would I know that? What differences would exist between two windows that share the same name?

Re: Restoring Window - Help.

Programm3r10-Jul-06 3:00

Programm3r

10-Jul-06 3:00

Sorry but I think they do have the same class names.....

Re: Restoring Window - Help.

David Crow10-Jul-06 3:05

David Crow

10-Jul-06 3:05

Then you cannot use FindWindow() to uniquely identify one over the other.

Did you create the windows (e.g., CreateProcess(), ShellExecuteEx())?

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

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

Re: Restoring Window - Help.

Programm3r10-Jul-06 3:10

Programm3r

10-Jul-06 3:10

No I didn't create the window, another application calls this dll and I check if the window is minimized and if it is I restore it. The application sends the dll a name that id'd the window name, and the rest of the problem I have already mentioned.

Do you have any advice / site / source?

Thanx for the response

Programm3r

Re: Restoring Window - Help.

David Crow10-Jul-06 3:14

David Crow

10-Jul-06 3:14

Programm3r wrote:
Do you have any advice / site / source?

Yes, just have the application send the DLL a window handle instead of a caption.

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

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

Re: Restoring Window - Help.

Programm3r10-Jul-06 3:19

Programm3r

10-Jul-06 3:19

Thanx for the advice ..... I'll see if i can figure somting out.

Programm3r

Data not received properly using COM Port [modified]

Ayesha Farheen10-Jul-06 1:58

Ayesha Farheen

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<

Re: Data not received properly using COM Port

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

Re: Data not received properly using COM Port

Ayesha Farheen10-Jul-06 3:28

Ayesha Farheen

10-Jul-06 3:28

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

Ayesha

Re: Data not received properly using COM Port

earl10-Jul-06 4:37

earl

10-Jul-06 4:37

And length? What happens if you flush the buffer?

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

Ayesha Farheen10-Jul-06 20:29

Ayesha Farheen

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

Re: Data not received properly using COM Port

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

Re: Data not received properly using COM Port

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

Re: Data not received properly using COM Port

Ayesha Farheen10-Jul-06 22:04

Ayesha Farheen

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

Re: Data not received properly using COM Port

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

Semion_N

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)

Re: Adding ActiveX

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..

Re: Adding ActiveX

Semion_N10-Jul-06 1:52

Semion_N

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)

Re: Adding ActiveX [modified]

Naveen10-Jul-06 1:43

Naveen

10-Jul-06 1:43