NewLC - see variable value in the emulator - Comments

Re: see variable value in the emulator

SymbianReady — Tue, 08 Apr 2008 11:57:14 +0200

Hey Mobi, I think you can do this in the normal Draw() function of your view. Why don't you just redraw your view and refresh the value to be displayed. If this variable's value is the only thing to be displayed.

Caution: This won't be a recommended solution in case you have to draw quite a few things in your view.

Re: see variable value in the emulator

alh — Mon, 07 Apr 2008 13:47:58 +0200

...

Try to understand what you write and don't just copy-paste code.

That will only lead to lots of headache, and really weird bugs, or if you're lucky like this time, it will just not compile.

The problem seems to be that I accidently re-used the name "scrdev" in my example code.
Call it something else.

(No, I will NOT post the exact same code again with some new names of the variables... )

Re: see variable value in the emulator

miriwiri — Mon, 07 Apr 2008 11:06:43 +0200

Sorry, but i'm not able to make this code run. Now I have another error because scrdev is now a CWsScreenDevice variable so I can't call gc->Activate(scrdev);. I have never used all of this and it's driving me crazy.

Re: see variable value in the emulator

alh — Mon, 07 Apr 2008 10:47:05 +0200

no you don't...
That would be a bit silly if you needed a window for this.

It was just one example of how to get the displaymode to use.
That code would work for example inside a CCoeControl, I assumed you might have a few of those in your app already.
The function Window() gets the window of the CCoeControl.

As I wrote in the post, (even though I didn't post the exact code) another way to query for the displaymode to use is to ask a CWsScreenDevice about it:

CWsScreenDevice* scrdev = CCoeEnv::Static()->ScreenDevice(); //gets the current screen device of the application framework
TDisplayMode currentdisplaymode = scrdev->DisplayMode();

Re: see variable value in the emulator

miriwiri — Mon, 07 Apr 2008 10:03:53 +0200

CFbsScreenDevice* scrdev = CFbsScreenDevice::NewL(0, Window().DisplayMode());

Do I have to create a Rwindow variable called Window to call the previous line? It's because I have this error: undefined identifier Window. but if i create RWindow Window I have also an error: call of non-function. thanks

Re: see variable value in the emulator

alh — Tue, 01 Apr 2008 14:02:01 +0200

You need to include bitdev.h for CFbsScreenDevice and bitstd.h for CFbsBitGc. (possibly you need only one of them for both)
The library is bitgdi.lib

Also, you need to specify the displaymode... Just wrote that code from the top of my head.

ask a window for its displaymode (RWindow::DisplayMode()), or ask the CWsScreeenDevice for the current display mode. (you get the CWsScreenDevice from CCoeEnv::Static()->ScreenDevice())

CFbsScreenDevice* scrdev = CFbsScreenDevice::NewL(0, Window().DisplayMode());

Also remembered one more thing you might have to do: call Update(TRegion) on the CFbsScreenDevice, to get the content to the LCD.
Must be the one with a region, the region-less version will think there is no updates and do nothing.

use it like this to update a rectangle on the screen

TRegionFix<1> region(TRect(0,0,20,100)); 
scrdev->Update(region);

above is an example that updates the area drawn in my previous example, you can ofcourse change the rect, or add more rects to the same region.
TRegionFix is a simple-to-use region with a fixed number of rectangles for the region.
Since it is all on the stack, it doesn't have to be closed, so nice and easy to use...

Re: see variable value in the emulator

miriwiri — Tue, 01 Apr 2008 11:21:51 +0200

thanks alh.
I've tried your code and I have an error in the first line: function call '[MyProgram].NewL(int)' does not match. Sorry for this question but I've never used this class and i don't know how to use it properly. thanks

Re: see variable value in the emulator

SymbianReady — Tue, 01 Apr 2008 05:15:12 +0200

Nice Thought, and this can also be used to represent it in the final application (if required). Will reduce your efforts too.

Re: see variable value in the emulator

alh — Mon, 31 Mar 2008 16:03:07 +0200

If you just want to display the number for debug purposes, and you don't care if you mess up the screen a tiny bit in the process, you could just draw it to the screen directly.

something like this:

//construction
CFbsScreenDevice* scrdev = CFbsScreenDevice::NewL(0); //0 for main screen
CFbsBitGc* gc = CFbsBitGc::NewL();
gc->Activate(scrdev);
gc->UseFont(coeEnv->NormalFont());
gc->SetBrushColor(TRgb(0,0,0));
gc->SetPenColor(TRgb(255,255,255));

//do it
gc->DrawRect(TRect(0,0,20,100)); // black background rect
gc->DrawText(_L("Hello"),TPoint(0,0)); //white text.

//destruction
gc->DiscardFont();
delete gc;
delete scrdev;

And you don't have to recreate gc, scrdev, and set it up every time ofcourse... just drawrect and drawtext.
Should work fine for numbers that update a lot. (if anything else draws on the area where the number is shown, it will be overdrawn)

Re: see variable value in the emulator

miriwiri — Mon, 31 Mar 2008 13:20:21 +0200

Thanks a lot!!!

Re: see variable value in the emulator

SymbianReady — Mon, 31 Mar 2008 13:13:20 +0200

Then I would suggest that you should check for the CAknWaitDialog and the callback mechanism to set the values of the dialog dynamically. But be cautious, this might distract you from what you are currently doing. Try going this way only if this is very much required, you are very curious to do this or, if you have enough time to put the extra effort.

This is the best I can think, if I get a better solution, will let you know.

Cheers!!!

Re: see variable value in the emulator

miriwiri — Mon, 31 Mar 2008 13:03:18 +0200

that's it, symbian ready!! That's the point. I have to display the value of the heart rate without breaks and of course it has to change in every loop. So the breakpoint solution is not a good solution for me and the CAknInformationNote is not either because it has an error and i doesn't actualize the value. I've been searching but i haven't found any other solution. Anybody has any other? thanks!

Re: see variable value in the emulator

SymbianReady — Mon, 31 Mar 2008 13:01:39 +0200

Can you please elaborate a bit, what exactly do you want to do....

Re: see variable value in the emulator

nabil — Mon, 31 Mar 2008 12:44:04 +0200

i would like also to do this. please help

Re: see variable value in the emulator

SymbianReady — Mon, 31 Mar 2008 05:17:51 +0200

Ya to check the value in the emulator using breakpoint is the best for debugging and finding the error(s) if there are any, but is this the real question?, from the explanations and code sent by moby, I think, she want to display the changing value of the HeartRate() on the screen without any break. In that case breakpoints will just ruin the scene. So it is upto you moby, to decide and clarify what exactly do you require.

see variable value in the emulator

miriwiri — Wed, 26 Mar 2008 16:30:03 +0100

Hello
How can I see the value of a variable in the emulator? I'm using Symbian c++ s60 3rd FP1. thanks