|
I need to send a text file directly to a printer using the belkin usb to parallel port cable. I installed a generic printer so I could see the name of the printer port and then passed USB002 to WriteFile, but it gives me an error and says that the com port does not exist. Has anyone used this cable to send data directly to the printer through the parallel port and if so could you tell me how to do it or give me some pointers.
Roger
|
|
|
|
|
A Com port is a serial port, not parallel.
Did you install the driver for the USB to parallel adaptor (it is NOT just a cable)?
The tigress is here 
|
|
|
|
|
hi can anyone tell me
how can i get & send data to
a USB port from a VC++ application
thank you
Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com
|
|
|
|
|
I use a USB port as serial port and handle it just like a serial port. Of course I have a USB to serial peice of hardware on the port.
The point is the port can emulate almost anything. If you want to use the port as one of the standard ports (serial, parallel) then you just get such a device. If you want to create you own device (you can) then you have a lot more work. There is a web site that is totally dedicated to USB programming for the making of all kinds of hardware devices. Try
www.Lvr.com
Brian
|
|
|
|
|
that is a good site
Vikas Amin
Embin Technology
Bombay
vikas.amin@embin.com
|
|
|
|
|
there is a USB24 I/O which you can use to control up to 24 devices
|
|
|
|
|
Does anybody know a software that can monitor real-time the amount of data being processed, memory usage, etc. within the video card? Please help... Thank you very very much!!!
|
|
|
|
|
I'm wondering if it is possible to generate pure randomness with a typical PC.
I'm thinking there might be hardware within the PC that runs at different clock frequencies with electronic variances that can be used to generate a stream of pure randomness.
|
|
|
|
|
I think "generate pure randomness" is an oxymoron. The best you can do is use a source that is highly variable and not predictable. APIs like CryptGenRandom() sample dozens of system parameters to come up with a source that changes so much as to make it unpredictable. Or you could rig up something similar to LavaRand. 
--Mike--
Visual C++ MVP 
LINKS~! Ericahist | 1ClickPicGrabber | NEW~! CP SearchBar v3.0 | C++ Forum FAQ
Laugh it up, fuzzball.
|
|
|
|
|
No, you'd need external hardware to do this. The built in sensors are only sensitive enough to detect problems, not record pure noise like you'd need for a RNG.
|
|
|
|
|
One way, that I've seen other site's recomend, is to play some noise in the speakers, then record the sound with a microfone. Then you'll get something very close to random.
The one and only Niklas Ulvinge aka IDK
|
|
|
|
|
If you want to generate randomness interms of numbers,
then you can add some huge numbers and make overflow in the register.
The generated number everytime will be the random number
Anil Kumar
|
|
|
|
|
When I start my computer, it doesn't connect to the screen...
The screen only goes into powersaving mode, wich it does when it doesn't connect to the PC...
The one and only Niklas Ulvinge aka IDK
|
|
|
|
|
Do you have a 2nd monitor/pc available? If so switching screens will show if hte problem is hte monitor or the PC.
If not, do your PC give the normal beep(the on boot beep is an errorcode) when you turn it on? If it does the problem's your monitor, if not your PC. If it's your PC, we need to know it's model and how it's beeping differently to diagnose the problem.
|
|
|
|
|
Yes your right, it's bios error, it won't beep at all when I start it
I've been mixing a little with some harddrives and cd drives... But that can't be the problem, couse bios would start anyway...
I hear everything spin up, but then I don't know what happends...
The one and only Niklas Ulvinge aka IDK
|
|
|
|
|
If it's not beeping the problem is probably something other than the bios. A failing power supply (bringing some power but not enough), or dead cpu would be more likely. If you have a multimeter you can check the former. Stick the probes into both a spare drive connector and the one on the mobo (a loose connection, or failing mobo parts could make the voltage levels different here than on a drive connector). Black to Red should be 5V, Black to Yellow 12V. A deviation of +-5% is within accepted bounds, more than that could be the problem.
|
|
|
|
|
OK, I don't got a multimeter... I think my dad got one, but he's  now.
I'll have to do it tomorrow...
The one and only Niklas Ulvinge aka IDK
|
|
|
|
|
Niklas Ulvinge wrote: The screen only goes into powersaving mode, wich it does when it doesn't connect to the PC...
I take it this same screen and graphics card have worked together before?
You'll have to forgive me for asking a few questions before I can say anything else.
Does the machine actually turn on and post? You should hear one short beep on startup. If you hear any other number of beeps look here[^] if you hear "no beeps" indicating no POST operation occurs take it to a shop, or look here.[^]
outside of that, you can check to make sure the VGA cable is connected tight (a loose connection can decide to move enough to stop connection just by time and gravity). Make sure you have the right VGA cable connected (some monitors have more than one input).
Without more information on what is happening durint POST I can't help much. If it is the video, and you have a friend who lets you open up machines, you can swap video cards. If your computer boots normally on his card, and his computer does not show video, you know the problem is with the graphics card and can replace it (thank him with a beer/soda as per his preference and head off to the store).
The easiest way to troubleshoot failed technology is with spare parts, making it more difficult for the average person. With some more details on what the computer is doing, can you pop the case open (preferably without damage) and peek to make sure the video card is plugged in, CPU fan starts turning (and GPU fan if appropriate). Any northbridge cooling that is on the motherboard also, basically if it has a fan, make sure it is turning. If not, that's a strong indication of where a problem started, though it may not end there.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
|
|
|
|
|
Thanks for your reply.
Read my other post...
I didn't think of the possibility of bios errors...
The one and only Niklas Ulvinge aka IDK
|
|
|
|
|
Does anyone have a link or article featuring the components and roles of the video card? If you also have a link or article for data routing in video capturing (recording and previewing) it would be much appreciated... This is because I want to know how it is related to video recording. We are having problems with simultaneoudly capturing video using 4 usb webcams(same brand and model). We pin-pointed that the video card may be the source of our problem... Thank you very much... 
|
|
|
|
|
I can't find the one I was looking for. This may help a little as far as explaining the complexity of the graphics system: Windowing_System_on_a_3D_Pipeline_Slides.pdf[^]
Now, until Vista, the windowing manager is not within the 3D pipeline, it is consider a raster only process. Most of a raster process in the IO to the card.
_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)
|
|
|
|
|
Thank You Very Much! 
|
|
|
|
|
I'm looking for a cheap laptop (probably new not second-hand) for a student. Mainly for word processing, a bit of spreadsheet stuff, etc. Certainly no programming, and I don't care about games!
Since it is certain to be lost / stolen / broken / filled with coffee, I have no interest in buying anything even remotely state-of-the-art.
I have seen a laptop using 1GHz VIA C1, 256Meg RAM, 40Gig HD, WinXP Home, for 25% cheaper than any other new laptops. Any comments?
|
|
|
|
|
IIRC the via chip only does half/cycle as a p3/athlon does, so performance wise it's a athlon 500, or p4 650. Shouldn't matter for what you intend but you should be aware of what you're actaully getting.
|
|
|
|
|
Thanks.
For what it's worth, I got the processor wrong - it's a VIA C3, not C1.
I found some reviews (Tom's Hardware, etc) which indicate that the floating point unit on a C3 is lousy.
On benchmarks, the 1GHz C3 performs between a 433MHz Celeron and a 1GHz Celeron (depends on the test.)
Since I was happy until recently with my 667 MHz Celeron (when I wasn't building projects in Visual Studio 6), a student can live with a 1GHz C3 notebook!
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
