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Installing a system-wide hook to monitor mouse and keyboard activity would work but is also very "invasive." Another solution would be to call GetLastInputInfo() periodically.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi, Thanks,
The invasive nature of installing a system wide hook for mouse and keyboard activity was really a concern, as appeared to be an overkill. so I have been thinking of using the App Message Map. I am really interested only in a 'Kick to Keep Alive' setup for my Cash Register Application. When the User is away, or, the Computer acting as Cash Register has switched context to another Application (Now THAT is an old fashioned term) the dormant Program should Quietly Log the current User Off!
Your idea is another one worthy of consideration, and further perusal.
Thanks,
Bram van Kampen
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Now ,i have one question. I use library to define a matrix B, for example, as follows, how can i convert B.real() to a double[] array?
thanks very much.
MatrixXcd B(n,3);
for( int i=0; i<n; i++ )
for( int j=0; j<3; j++ )
B(i,j)=0;
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I did not have used it so far but it should be possible to copy the values to your array this way:
double *da = new double[n * 3];
for (int i = 0; i < n; i++)
for (int j = 0; j < 3; j++)
da[i*3 + j] = B(i, j).real();
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Thank you very much.
My code is in Loop many times, so i want a efficient code. your code can reach my function,but efficient i think it's not good.
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It is difficult to answer without knowing how the data are used. But a short web reserach found this: [EIGEN] How to get in and out data from Eigen matrix | Vlad's Blog[^].
So it seems that you can use Map to get a pointer to the complex values. That should be sufficient because the real part is stored first and therefore already at the specified index (when *p is a pointer to a complex array, p[n] and p[n].real() have the same address).
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Hi,
Working with MFC Ribbon designing Ribbon Menu with the help of XML .Now the problem is ,I want to design Menu by single-2 (.bmp)images not by the transparent Images Strip with the help of Index.
I have tried so many ways but don`t get any success.
<CATEGORY>
<ELEMENT_NAME>Category</ELEMENT_NAME>
<NAME>Home-Y</NAME>
<KEYS>H</KEYS>
<IMAGE_SMALL>
<ID>
<NAME>IDB_WRITESMALL</NAME>
<VALUE>110</VALUE>
</ID>
</IMAGE_SMALL>
<IMAGE_LARGE>
<ID>
<NAME>IDB_WRITELARGE</NAME>
<VALUE>111</VALUE>
</ID>
</IMAGE_LARGE>
<PANELS>
<PANEL>
<ELEMENT_NAME>Panel</ELEMENT_NAME>
<NAME>Clipboard</NAME>
<KEYS>D</KEYS>
<INDEX>1</INDEX>
<ELEMENTS>
<ELEMENT>
<ELEMENT_NAME>Button</ELEMENT_NAME>
<ID>
<NAME>ID_EDIT_PASTE</NAME>
<VALUE>57637</VALUE>
</ID>
<TEXT>Paste</TEXT>
<KEYS>V</KEYS>
<INDEX_SMALL>0</INDEX_SMALL>
<INDEX_LARGE>0</INDEX_LARGE>
</ELEMENT>
</ELEMENTS>
</PANEL>
</PANELS>
</CATEGORY>
The most important this, we can not change main tags of XML, beside you can change any thing related IMAGE TAGS,.
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hi all,
i am taking help of this article for printing
Another ListView print (preview) sample.[^]
here i also want to save my print view of doctument to save as pdf.
how can i do this.
please help me for this.
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You need to install a PDF printer driver to use as your destination device. Alternatively you can write the code yourself using a third-party library, or code it from scratch by studying the Adobe PDF specification.
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can u please provide me any example of this.
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Example of what? If you want to use a printer driver then Google will find you one. If you want to write it yourself then Google will again find you samples.
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I am building my first class to output graphic to LCD connected to a micro.
Making small progress, however, since there is no proccess feedback form the LCD itself I have to "wait" until something, anything , shows on the LCD.
To test my code I opted to let the constructor paint the whole screen red.
Now for silly question.
I understand constructor function is to instantiate the class so the class methods can be used.
In general most constructors in micro world just take care of very basic - I/O pins assignments, serial baud rate etc.
Would it make more sense if I do all the painting OUTSIDE of constructor?
Or is is just one of those "personal preferences" ?
Eventually I will have more than one instance of this class running.
Thanks , any comments are as always appreciated.
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When using the class multiple times it will make of course sense to perform the output in it's own function. Otherwise each usage will initially draw the same. Even for testing you can call that function (it is just one function call after creating the class).
While you can do anything you want in a constructor, it is often not utile. Because constructors did not return a value, you will often find an additional setup function that returns success/failure while the constructor only initialises members variables.
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Vaclav_Sal wrote: To test my code I opted to let the constructor paint the whole screen red.
Painting sounds like a behavior rather than a setup. Thus the constructor isn't where it goes.
Vaclav_Sal wrote: in micro world
Far as I know micro coding tends to strongly favor execution efficiency. So that decides it. After that then for object oriented programming it follows the idiom that
1. The constructor does what must be done for the object to exist. If it fails then the object cannot exist.
2. Other than 1 everything else is behavior so a method not in the constructor.
So if you can't paint the screen red is that a error or does it mean that caller is done and cannot and must not proceed?
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Thanks.
It definitely makes sense to utilize methods return values, something I do most of the time anyway, and let the constructor just do very basic.
As I mentioned, in the real case of LCD class, I do not have feedback from most of methods,so I need to change my debugging.
Instead of blindly painting the whole screen I'll just paint one pixel ( which I probably won't be able to see) and than read it back.
I guess I should walk before running, or better yet after falling down while running it is time to go back to walking.
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If it clears things up at all....
If you ever write some C++ code using MFC (Microsoft's Foundation Class, essentially an OO wrapper around the WinAPI), you'll notice that there are always initialization routines aside from constructors (they're called OnInit...blah ).
If you happen to use a dialog object, and attempt to draw from the constructor instead of the initialization routine, you'll notice that the objects exist but are not windows yet so you'll get an assertion (if running in debug mode). This means that the constructors have been called but nothing has been drawn yet. The drawing only occurs after all the constructors have been called, the initialization routines are systematically called after that and you can load all the widgets with whatever the default values to be displayed are.
Moral of the story, drawing typically doesn't take place during construction of objects.
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Hi,java has
-- modified 3-Apr-18 8:53am.
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madhuresh sachan wrote: after this line cursor goes direct to the end of function,does not read below given code
What does this mean?
How did you know that the code is not read (executed would be a better word) if not using the debugger?
Your code snippet contains no operation that changes any GUI element (enables/disables items) so that you would not 'see' anything.
So run your program in the debugger and check what happens (e.g. by inspecting pRibbon, initial pos, lstItems.GetCount(), and the loop execution).
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Thanks for your reply
pRibbon->GetItemIDsList(lstItems);
In "lstItems" all the items of menu is coming,
But the Main Problem is
when I run this on debug mode,it is not executing the code after "pRibbon->GetItemIDsList(lstItems);" line of code.
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So when you set a breakpoint at the for loop after
pos = lstItems.GetHeadPosition();
that is not hit and execution is not stopped?
That would be weird.
I assume that you are using a debug build with all optimisations disabled. Otherwise, the compiler may optimise away the following lines because they effectively do nothing.
To check this you can insert a TRACE statement inside the loop printing nElement.
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I was asked, "If we have mutexes, why do we need critical sections?"
My answer was that mutexes protect resources and critical sections protect code.
Was I on the right track?
The difficult we do right away...
...the impossible takes slightly longer.
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Richard Andrew x64 wrote:
Was I on the right track?
You decide:
Critical Section vs. Mutex - MSDN Blogs[^]
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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I would think that in general, mutexes are purely kernel controlled objects whereas critical sections are mostly "user mode primitives", meaning it's application level logic most of the time (which runs a lot faster without requiring the kernel to be involved). Of course, this also implies a critical section is bound within a process and cannot be shared across processes. The exception is when there actually is a conflict, then a critical section makes a kernel call for synchronization.
If you write some test code, you should be able to notice the speed advantage of a critical section (and all the kernel system calls of a mutex).
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