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hi there,
i have coded an aplication that talks to a relay board via the parallel port on my pc,it has eight relays on it that effectivly turns things on or off upon recipt of a command.
so what i want to be able to do is set an on and off sequence for each individual relay on the board,using some sort of timer as a trigger.
i think i will need eight timers that are in sync with the sytem clock and will trigger when the values match
can anybody point me in the right dirction as how to achive this
chris
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If you are using MFC, take a look in CWnd::SetTimer (...) and KillTimer (...)
without MFC i have read the function sleep sometimes, but to make a pause I dont know if it triggers code
Greetings.
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
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Hello
I have written a small application which reads the registry keys present in a .txt file and tries to export each key using regedit, i.e. I read each line of the file (which is a key) and using the commandline for regedit (regedit /e "target file" "source key") I export it into a folder creating a new .reg file for each key read from the file.
Now in my .txt file there are around 11,500 keys. The keys are successfully exported till 5450, but after that calling CreateProcess on regedit returns error no. 1450 (no system resources) and all the subsequent keys are not exported into the target folder.
What could be the reason for this error to come up? And how should I change the logic so that this error doesnt come up and all the 11500 keys are exported as different .reg files into my target folder?
Thanx.
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vipin_nvk wrote: no system resources
Are you closing the processes after each one is used. Windows has a resource limit of 10,000 resource handles 10,000 limit[^](or something like that) per process and if your spawning outside processes, they may count against your main process. I'm not sure how the rules work with spawned processes.
However, be informed that a resource handle can include pens, brushes, windows, etc... and depending on the type of windows or controls being created, you can hit the resource limit pretty quick.
Try closing things that might maintain handles to resources once you are finished with them as it sounds like their being maintained somehow.
Here are some links about resource handle limits...
Concerns about resource handles and Raymonds words on the matter[^]
Window Manager limits[^]
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Hi every one;
This is my first time here. and I faced problem with Visual C++ 2005.
the problem is:
I want to read 6 keys from keyboard as same time. for example (zxcnm,). because I will replace them with dots. that means if the user press c and z it means dot one and dot 3.
may any one help me in this topic. please
Thanks
--------------------------------------------------------------------------------
allooba
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Is this a console or a GUI application? If the former, check out getch(). If the latter, check out the WM_CHAR message.
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Thnaks man;
but I am beginner in Visual C++, I found more files like (".h" and ".cpp"), but in which one can I wrote my code.
in ".h" file, when I duble click in any item in the form it is open the code in ".h" file.
can u give me small notes about this.
alot thanks.
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allooba wrote: I found more files...
What type of project did you opt for? With a console application, it'll likely contain one of each, making editing them about as easy as it gets.
allooba wrote: in which one can I wrote my code.
Both, since everything is technically code. Files with a .h extension typically contain declarations, while files with a .cpp extension typically contain definitions.
"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman
"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne
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Thanks again David;
I wrote all my code in ".h" file, that because when I duble click in any object in form desigin it is open in ".h" file.
but I face message error when I try to handel keypress function in text area object. how can I hendel the input? it gives me error message " the keypress function not member in system::windows::forms::control::keypress"?
can you help me in this issue?
my project is small program to simulate braile letters. that means 6 dots in one char.
thanks David.
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Hi All,
I have created the project of MFC Activex Control and also I have included other project as a DLL in the same solution.And my Activex project is depends on the DLL project.
Here First of all I want to ask you that is it possible for the Activex project to depend on DLL project? Is there any other setting I have to make?
And now when I compile the project it gives me the error like......
Project : error PRJ0050: Failed to register output. Please ensure you have the appropriate permissions to modify the registry.
In my DLL project I have made some registry operations.How can I get appropriate permissions to modify registry?
Thanks In Advance.
Ashish Bhatt
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ashishbhatt wrote: How can I get appropriate permissions to modify registry?
Log in with a local administrative account and try again would be the simplest approach. By default, not involving discussion of any type of UAC, only certain accounts have modify or write rights to HKLM and HKCR and it sounds like your not logged in with one of them or your IT staff has made modifications to the standard registry rights settings.
If you on a Windows Vista box with UAC turned on, you will potentially get some false positives if your not familiar with what is going on under the hood.
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Thanks For Reply,,
As you told to login in local Administrative,But I am already working in administrator Account.
And my other confusion is that is it possible that IO can add other DLL in the solution in which Activex project is the main project.But here my Activex project depends on DLL project.
Thanks.
Ashish Bhatt
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I'm not really sure what it might be then. I googled and the first hit I got looks interesting/promising...
(Specifically, the "community content" section had some detailed talk about possible things to look for)
Ideas[^]
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hi every one
i want one simple sample of CListCtrl print and print perewie in CFormView Project.
please help me
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For print preview see here[^] and here[^] for first section of your question can you more explain ?
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Is not going to be easy. You have the structure of the ListCtrl in your FormView, but in the preview... you will most probably need to do the work by hand.
About the example, some days ago there was a question about CListCtrl, I already answered with the initialization of the Report mode with variable width for columns.
See here[^]
By the way... take a look in the articles too. There are very good examples here[^]
Greetings.
--------
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
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hello all,
what is the base class of CBannerStatic class.
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if you're talking about this[^] article, then 2 things :
1) when you have questions related to an article, ask it on the forum directly at the bottom of the article, so that the autor will be answering you directly.
2) BTW, looking at the code (yes, even you you can open the zip files), this class inherits from... CMultiColorStatic.
I don't know much of the later, but it inherits itself from CStatic; but as i said previously, you'd better ask the article's author.
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Hello everyone,
Any practical experiences of VirtualAlloc v.s. malloc? From MSDN, I can not find any comparisons between the two methods.
thanks in advance,
George
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VirtualAlloc is more efficient.
malloc is a C library function interface, it is implemented by calling the OS API. More in "programming applications for ms windows" by Jeffrey Richter
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Thanks followait,
Could you let me know more details why VirtualAlloc is more efficient please?
regards,
George
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VirtualAlloc()[^]
BTW, you already got a reply here[^] (on one of the 4 or 5 forums your posted this question  )
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Thanks toxcct,
What is the differences between HeapAlloc and VirtualAlloc? They allocate memory from different spaces?
regards,
George
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man i'm starting to be seriously tired of your laziness.
not only you don't start to search the web before asking a forum, but you gettin me on my nerves because every thing you don't understand when someone answer you (because of your lack of knowledge), you rate it badly 
I tell you, i give you this question a '1', because you HAD TO google for "HeapAlloc vs VirtualAlloc" first.
we're not here to do everything for you. you have to make the first step, and only when you're stuck on something, then you tell all the stuff you tried. not before 
BTW, you never answered me how old you were since last time
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followait wrote: VirtualAlloc is more efficient.
No, it's not (in general)! VirtualAlloc can only allocate memory in 4k chunks; if you use VirtualAlloc as a malloc replacement allocating one byte would result in wasting 4095! Part of what the code behind malloc does is carve up the memory blocks returned via VirtualAlloc to avoid this wastage. malloc also has a number of other optimisation such as a small block heap.
Steve
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