C / C++ / MFC

13-Jun-02 7:07

something like this:

HFONT hNewFont = ::CreateFont(...);
HFONT hOld = ::SelectObject(hDC, hNewFont);
... 
::SelectObject(hDC, hOld);
DeleteObject(hNewFont);

-c

Cheap Oil. It's worth it!

Image Processing?

Fatal Error

Sidney13-Jun-02 5:42

Sidney

13-Jun-02 5:42

Hi everyone,

I have an error like this:

Linking...
Creating library Debug/PrsPunct32.lib and object Debug/PrsPunct32.exp
Debug/PrsPunct32.exe : warning LNK4086: entrypoint "_mainCRTStartup" is not __stdcall with 12 bytes of arguments; image may not run
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/PrsPunct32.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

I am using VC++ 6.0 What's causing this? and how can I solve this?

Thanks/Regards
Sidney

Re: Fatal Error

Le centriste13-Jun-02 5:50

Le centriste

13-Jun-02 5:50

try compiling with /Gz option

Michel

It is a lovely language, but it takes a very long time to say anything in it, because we do not say anything in it, unless it is worth taking a very long time to say, and to listen to.

- TreeBeard

Re: Fatal Error

Sidney13-Jun-02 7:02

Sidney

13-Jun-02 7:02

Hi Mich,

I still get the same error even if I add the /Gz option. Any Idea Smile | :)

Thanks/Regards
Sidney

Re: Fatal Error

srinivas vaithianathan13-Jun-02 8:14

srinivas vaithianathan

13-Jun-02 8:14

Looks like you are building a DLL. make sure you have all your project settings correct. use the app wizard.

Serial Comms

Derek Lakin13-Jun-02 5:06

Derek Lakin

13-Jun-02 5:06

Having established a serial comms connection to COM 1 to access a modem it is possible to send AT command strings for the modem to interpret. In this way I can instruct a modem to dial a particular number and connect to a receiving modem and application.

Once the connection has been made the modem goes into online mode and so any data then sent to the COM port is then sent over the connection to the receiving modem and application. If I want to end the call from the initiating end, presumably I can just call CloseHandle on the handle created with the initial call to CreateFile and that will end the call.

However, from the receiving end, I would need to return the modem to command mode to issue the ATH command to terminate the call. Orinarily you would issue the escape sequence "+++" to get the modem into command mode. However, if I send "+++" to an open serial port it will just send that data over the connection Frown | :(

How can I get a modem back into command mode? Or am I going about it the wrong way?

I have already tried TAPI, unsuccessfully (see earlier posts), hence my attempt to use serial port comms.

Derek Lakin.
I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

Joaquín M López Muñoz13-Jun-02 7:05

Joaquín M López Muñoz

13-Jun-02 7:05

The standard sequence is <wait at least 1 sec>+++<wait at least 1 sec>. Maybe that's your problem.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Derek Lakin13-Jun-02 7:55

Derek Lakin

13-Jun-02 7:55

Sorry if I wasn't clear enough in my original post. If you use CreateFile to connect to the COM port and send the string "ATD Phone number" to the modem, anything you send after that, including "+++" gets sent as data. It does not recognise "+++" as the escape sequence.

Derek Lakin.
I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

Joaquín M López Muñoz13-Jun-02 12:14

Joaquín M López Muñoz

13-Jun-02 12:14

Sorry if I wasn't clear enough in my original post.

Maybe it's me who hasn't been clear in the answer Smile | :)

What I meant is that you have to include two surrounding safeguard periods of at least 1 second in which you don't send any data to the modem for it to recognize the +++ as a escape sequence. I've successfully used this thing in the past, I'll send you a code snippet tomorrow when I get to work. Another possibility is that you need some previous AT command to instruct the modem to understand the +++ bit, but I don't think so.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

JohnnyG13-Jun-02 9:09

JohnnyG

13-Jun-02 9:09

I'm curious as to what the answer to this question is too.

I don't know if this will help but the MTTTY sample in MSDN makes a call to EscapeCommFunction(portNo, CLRDTR) which lowers the DTR signal. Then it is followed by restoring comm timeouts via SetCommTimeouts(), calls PurgeComm() and finally closes the handle to the port. I don't know if you're still connected and then are allowed to send the "+++" ATH at the point before closing the handle. The MTTTY sample should work with a modem but I did not see a "dial" command but it should pass on the AT commands too.

HTH

Derek Lakin13-Jun-02 9:21

Derek Lakin

13-Jun-02 9:21

Thanks for the tip. I'll look into it at work tomorrow.

Derek Lakin.
I wish I was what I thought I was when I wished I was what I am.

Salamander Software Ltd.

associate data with tree item's

Ravi Sudhakar13-Jun-02 22:54

Ravi Sudhakar

13-Jun-02 22:54

Hi,
I work on a project which has this feature. It connects to some devices through MODEM also. It's working well.
The sequence of events happening are:
1. Send '+++'
2. Dial the modem by sending 'ATDT 1234' //1234 is the ph.number
3. wait for response from the other side (receiving MODEM.
4. Once u intrepret this response and it is correct, u r connected successfully.

Note: U can actually try dialing the modem thru' Hyperterminal provided by windows.

Hope this helps u..

thanks,
ravi.

Steve L.13-Jun-02 4:22

Steve L.

13-Jun-02 4:22

I have a tree control and I need to associate 50+ varables with each item of the tree. I think someone mentioned a linked list or something but I'm not sure. Any tutorials about how to do this?

-Raffi

C^hris L^osinger13-Jun-02 4:26

13-Jun-02 4:26

the typical way of doing this is to put a pointer to a data structure in the item data value for each tree item. this "data structure" can be anything you want: a class, an array, a list, a vector, a simple structure, etc.. the trick is to make sure the things you are pointing to remain active as long as the tree is alive, because don't want pointers on the tree pointing at objects that aren't alive any more!.

so, in pseudo-code:

pObject = new SomeObject;
tree.SetItemData(treeItem, (DWORD)pObject);
...
...
...
then, when you have to use the tree's data:
DWORD dwData = tree.GetItemData(treeItem);
SomeObject *pObject = (SomeObject *)dwData;
pObject->DoSomething();

-c

Cheap Oil. It's worth it!

Image Processing?

Steve L.13-Jun-02 5:07

Steve L.

13-Jun-02 5:07

That looks great, just one question. Would SomeObject be my list or array or whatever I use?

-Raffi

C^hris L^osinger13-Jun-02 5:40

13-Jun-02 5:40

yes, exactly.

-c

Cheap Oil. It's worth it!

Image Processing?

MightyThor15-Jul-02 9:25

MightyThor

15-Jul-02 9:25

Hi,

I have a question a bit similar to this one.
I have a tree control that contains different types of items. Since there are three kinds of classes, i cannot use a type casting. First, i need to find the type of the object.

I intend to use something like below :

DWORD selectedItem = (DWORD) m_treeMain.GetItemData(
m_treeMain.GetSelectedItem() );

if( selectedItem.IsKindOf( RUNTIME_CLASS( CBand ) )
// Pop appropriate menu

But i can't use "." operator with selectedItem.

How should i do it?

Thank you.

C^hris L^osinger15-Jul-02 10:19