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This is a large question, but I wish to know if it's possible to create hardware and then access it through VC++? Perhaps make an LED light up through an USB port... I can't seem to find anything on the internet about this, does anyone know if it's even possible?
Again, I know it's a big question, but I'm just curiuos... Thanks!
If you have a problem with my spelling, just remember that's not my fault. I (as well as everyone else who learned to spell after 1976) blame it on Robert A. Kolpek for U.S. Patent 4,136,395.
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Selevercin wrote:
can't seem to find anything on the internet about this, does anyone know if it's even possible?
Of course this is possible but there is a lot of work involved. You must write a driver. Windows 9X drivers are completly different from windows NT drivers.
John
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Hmmm... thanks for replying. Is there information on this somewhere?
Selevercin
If you have a problem with my spelling, just remember that's not my fault. I (as well as everyone else who learned to spell after 1976) blame it on Robert A. Kolpek for U.S. Patent 4,136,395.
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I'm sorry I don't know of any good sources of info on this kind of thing. In the past we have investigated doing stuff like this but we thought that it would be too time consuming for what we got out of it..
John
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Selevercin wrote:
Is there information on this somewhere?
Possibly here:
http://flounder.com/books.htm#Developing%20Windows%20NT%204.0%20Device%20Drivers
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Thanks for the help... I think it's going to be too complex and time consuming to actually do it though.
Thanks again,
Nic
If you have a problem with my spelling, just remember that's not my fault. I (as well as everyone else who learned to spell after 1976) blame it on Robert A. Kolpek for U.S. Patent 4,136,395.
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Yes, device drivers are no small undertaking.
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There is an article written in German here[^]which describes a DIY USB-interface. You can even buy the pieces and build it yourself.
If any german article does help you, the article seems to be very good.
My opinions may have changed, but not the fact that I am right.
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There is a way, and that is to used a serial interface (maybe with a USB to serial converter if you want) and control the handshake lines. This won't provide many lines, but is cheap and fast with a little bit of level shifting hardware.
Use one of the serial classes in http://www.codeproject.com/system/[^] that can directly control and read these lines.
Elaine ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
The tigress is here 
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I'm sorry, but "handshake lines"? I'm completely new to this sort of thing...
Thanks!
If you have a problem with my spelling, just remember that's not my fault. I (as well as everyone else who learned to spell after 1976) blame it on Robert A. Kolpek for U.S. Patent 4,136,395.
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The serial ports (COM ports) on your PC have transmit and receive data lines, plus some input and output lines which can be used to control data flow. The standard is RS232.
[^] provides a sample pinout. These signals are driven between +10 and -10 volts and certain ones can be used as individual inputs and outputs with a little electronics. Using a serial class which allows control of individual lines will let you use 2-3 output lines withotu having to write device drivers and is a lot cheaper than buting an I/O card to put inside the PC.
In your case, two output RTS and DTR are available on a standard PCserial port connector. If two ar enough then you're ok. If you need a lot more than two then it might be best to look at adding a digital I/O card to your PC since these usually come with device drivers.
Elaine
The tigress is here
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Thanks for the help! If I only wanted to flash an LED, then I would only need a serial port cable (and my LED) and some lines of code?
Trollslayer wrote:
[^] provides a sample pinout.
Also, was this supposed to have a link in it? Just wondering...
I would only need one output for an LED, right? I guess I would send bogus information through the output line while I wanted to have the light on?
Thanks, I know I'm asking a bunch of questions!
If you have a problem with my spelling, just remember that's not my fault. I (as well as everyone else who learned to spell after 1976) blame it on Robert A. Kolpek for U.S. Patent 4,136,395.
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Yes, one output.
If you use a line such as RTS on pin 7 of the 9 pin serial connector and ground on pin 5 then you can control the RTS pin with a serial port class that allows individual handshake pin control.
This is much better than trying to send data continuously although that would work most of the time.
Elaine
The tigress is here
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I reopened a program to work on and now I receive the message below when I try to compile. I looked at the FAQ section of the forum and found some similar items. I think 2.3 might be what I need but it didn't work. I did find the "msvcrtd.lib" file on my VC++ cd and I copied it into the LIB folders, but it didn't help. I'm stuckaroo.
--------------------Configuration: StdAfx - Win32 Debug--------------------
Compiling...
StdAfx.cpp
Linking...
msvcrtd.lib(crtexe.obj) : error LNK2001: unresolved external symbol _main
Debug/StdAfx.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
StdAfx.exe - 2 error(s), 0 warning(s)
--------------------------------------------------
I tried to do FAQ 2.3. but then got this message below:
--------------------Configuration: StdAfx - Win32 Debug--------------------
Linking...
LINK : fatal error LNK1104: cannot open file "msvcrtd.obj"
Error executing link.exe.
StdAfx.exe - 1 error(s), 0 warning(s)
-----------------------------------------------------
I went to MSDN.com and typed in "fatal errorLNK 1104" and got the following message:
Microsoft JScript runtime error '800a0007'
Out of memory
/search/app/Search_Execute29.asp, line 5476
------------------------------------------------------
I'm sure that's irrelevant
Thanks, Dave
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if it is ATL look for _ATL_MIN_CRT in project setting s and remove it.
Second issue is if you specify msvcrtd in linker settings it is automatically assumes msvcrtd.obj. You have to explicitly specify "msvcrtd.lib"
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I tried FAQ 2.4 in the forum, but I didn't see any of the ATL MIN or CRT items in the preprocessor area of the c\C++ settings. I'm not sure what is wrong.
also, when I type in msvcrtd.lib, I get the following message instead...
Linking...
msvcrtd.lib(crtexe.obj) : error LNK2001: unresolved external symbol _main
Debug/StdAfx.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
StdAfx.exe - 2 error(s), 0 warning(s)
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Is there any stable and reliable XML Reader/Writer classes anywhere that could be used around here? My particular need is for something for VC6 actually.
thank you
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Have you looked at the XML DOM?
http://msdn.microsoft.com/library/en-us/xmlsdk30/htm/xmmscxmlreference.asp?
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I have been using microsoft's DOM as well, but recently I've been thinking of using CodeProject's own PugXML.
http://www.codeproject.com/soap/pugxml.as[^]
Its seems to be a lot faster and lighter than the DOM. Doesn't have all the features of the DOM, but probably don't need them in most everyday projects anyway.
"..Even my comments have bugs!"
Inspired by Toni78
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Hi! How can i get IP addresses in a windows application?
-- Steve
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What do you mean by get? If you mean input, I typically use a plain old regular edit box, but there is an ip address edit box control that you could use. Or do you mean get the IP Address of the current machine? Or get the IP address of machines your connected to?
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Try gethostname() to get host name, then gethostbyname() to get host information
g_elbert
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Another solution is getaddrinfo() and getnameinfo().
Kuphryn
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