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Hi everybody!
I need to turn on/off a LED that is connected to an USB port through my app.
Thanks for each kind of help...
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Unplug it from the port. Should work.
led mike
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If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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how many led does it take to make a led mike ?
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Light-Emitting Developer?
Who knows, maybe instead a dropped zeppelin.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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 You can't connect a LED on your USB port. You probably meant that you have a hardware module that is connected to your USB bus and this module contains some LED ? If that's the case then we can't really help. The only important thing to know is that a USB port is not like a serial port: you don't open the port itself and send data on it. Instead you get the handle to a driver for your device and you communicate with the driver. What you exchange with the driver is specific to the driver.
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Why not? You can even keep warm your cup of coffe using USB.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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The difference is that the LED is not connected directly on the USB (it would be possible to do such a thing on a serial port, where you could set the voltage of one pin high or low, and of course some electronics to manage it). In the case of USB, you need to have something more intelligent that communicates with a driver on your PC
In the case of keeping your coffe warm, you probably also install a driver on your PC. And if you wanted to write a program to be able to change the temperature of the coffee (or anything else), you would need to communicate with the driver, not access the USB port directly. That makes a big difference.
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Cedric Moonen wrote: In the case of keeping your coffe warm, you probably also install a driver on your PC. And if you wanted to write a program to be able to change the temperature of the coffee (or anything else), you would need to communicate with the driver, not access the USB port directly. That makes a big difference.
Well you can write yourself the driver. Warming a cup of coffee probably it's worth the effort.
If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.
This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke
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Hello all,
I am currently using the sndPlaySound function in an MFC app. Some users are asking if it is possible to pause the audio in the middle as they are typically 3-4 min. audio files that are being played. Does anyone have any ideas on how to do this?
Any help at all will be greatly appreciated.
Thanks.
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OF course I suggest you use of MCI functions that are very good for play audio and video files.
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Hi,
I want to change the background color of a dialog. How can i do that?
thanks
Nitheesh
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Override OnCtlColor() method.
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In OnPaint() method,
call FillRect() or FillSolidRect() method with the brush color to fill the dialog
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See WM_CTL* for change color of dialog and other controls like Buttons,...
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hello All
i am wondering how to make a statusbar which is like MFC standard statusbar in a win32 application -non MFC
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Is it possible, when processing a WM_CHAR message or using OnChar() to get all pending char messages, (Not necessarily the repeated characters) in the message queue?
In other words, if you have a very expensive recalculate cycle and the user pounds in an "A", "B", and "C" on the keyboard before you've finished your last recalculate cycle, is there a way to effectively get "ABC" with a single handler on the next handler.
My issue is I need to determine if the character is even valid before my Invalidate/redraw but if I fall behind processing characters it tends to accumulate and delay the rendering process.
If I do the recalculate in the rendering process, the user experience appears smooth since the multiple invalidates equate to one recalculate cycle but the characters have been allowed in at this point making validation difficult for text inserts etc...
I need to calculate before I post the invalidate.
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What about using a PeekMessage() loop in your OnChar() to remove any remaining WM_CHAR messages from the queue?
Mark
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://codeproject.freetls.fastly.net/script/Forums/Images/coffee.gif)
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Interesting.
Took me a bit to figure out how to do this but it works nicely if I pump the message and skip the call to invalidate until no more messages are stockpiled in the queue.
Thanks for the tip!
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bob16972 wrote: if you have a very expensive recalculate cycle
Maybe that should be done in a background thread so it doesn't stop the UI thread from receiving messages?
led mike
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Thanks for the input.
Mr. Salsbery gave me a solution to get those queued messages through before I call invalidate and it's working pretty good.
This whole thing wouldn't be necessary if GDI+ wasn't so darn slow  (Really, I'm not complaining)
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hey guys,
I'm having a problem with a project I'm working on. When I compile my project, I get a "undeclared identifier "class" error.
<br />
<br />
***no includes(not part of code)***<br />
<br />
class TME_BasicParameters<br />
{<br />
public:<br />
* values taken from the basic programming screen */<br />
float torqueHighLim;<br />
float turnOffStage2;<br />
float torqueLowLim;<br />
float startAngle;<br />
float turnOffStage1; <br />
float trigger;<br />
float stage1Speed;<br />
float angleLowLim;<br />
float turnOffAngle;<br />
float angleHighLim;<br />
float stage2Speed;<br />
float backoff;<br />
<br />
int strategy;<br />
int app;<br />
int tool;<br />
};<br />
any ideas?
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