C / C++ / MFC

Re: Application crashes on calling OnPaint() function!?

7-Mar-16 21:59

Kiran Satish wrote:
and then it calls OnPaint

Which you should never do; see WM_PAINT message (Windows)[^].

Kiran Satish8-Mar-16 3:40

Kiran Satish

8-Mar-16 3:40

Thanks for your reply Richard. Could you suggest a better way to refresh my child dialog edit control where I draw these lines?

PKNT

Re: Application crashes on calling OnPaint() function!?

Richard MacCutchan8-Mar-16 5:53

Re: Application crashes on calling OnPaint() function!?

8-Mar-16 5:53

Well, you need to rethink your design. You should collect all the information related to the drawing as a result of user interaction, file processing etc. You then call InvalidateRect to tell Windows that your data has changed, and your window/client needs to be repainted. Then in the control you call your paint function in response to receiving a WM_PAINT message. It is at that point that you draw your lines, shapes, text etc.

David Crow8-Mar-16 3:40

David Crow

8-Mar-16 3:40

Kiran Satish wrote:
OnPaint();

I'm thinking you should call Invalidate() instead of calling OnPaint() directly.

"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

Re: Application crashes on calling OnPaint() function!?

Kiran Satish8-Mar-16 4:31

Kiran Satish

8-Mar-16 4:31

Yes, that did the trick. I do that in couple of other child dialogs, but was not using it in this dialog. Well, looks like you overlook something that's fundamental.

thanks David

PKNT

how execute query in access database with CRecordset file?

Le@rner4-Mar-16 18:05

Re: how execute query in access database with CRecordset file?

4-Mar-16 18:05

hi all,

i m using Access database with ODBC connection in my application.

here i am generate a CRecordset derived Class for each table in Database.

now here i fetch record here using while loop with movenext.

this is slow in process.

i want to use Query here to fast my process.

please help anyone to execute query to fetch,insert or update record record in table.

thanks in advance.

Victor Nijegorodov5-Mar-16 4:51

Victor Nijegorodov

5-Mar-16 4:51

Well, the first step is to create a query ( the easiest way would be to create it and test in the MS Access).
The second step - create the recordset that supports update and insert operations. See MSDN article [^] for details.

Re: how execute query in access database with CRecordset file?

David Crow5-Mar-16 16:55

David Crow

5-Mar-16 16:55

Le@rner wrote:

this is slow in process.

How are you measuring this?

Le@rner wrote:

please help anyone to execute query to fetch,insert or update record record in table.

Did you bother to read the docs? They'll answer most, if not all, of your questions. I have an article here that shows how to create a read-only recordset.

Other articles here.

AT command serially via C code

Member 123621671-Mar-16 6:57

Member 12362167

1-Mar-16 6:57

how to send at commands over serially via comport using C compiler and what will be the code

Re: AT command serially via C code

Jochen Arndt1-Mar-16 7:48

Jochen Arndt

1-Mar-16 7:48

Windows: Serial Communications[^]

Linux: http://www.tldp.org/HOWTO/Serial-Programming-HOWTO/[^] and Serial HOWTO[^]

Micro controllers: See the UART section in the data sheet and check if the manufacturer provides an application note about serial communication.

Passing macro parameters via function

Vaclav_1-Mar-16 4:48

1-Mar-16 4:48

<pre lang="

I am stumped again.
I have this macro which expect the parameter registerSAM to be a symbol , for example PIO_ODSR.
I like to pass such symbol to a function and just have no idea how to convert char* to such symbol.

The compiler is not much of a help, just flags an error.

This is how the macro is used now

P_CB[iIndex] = portREGISTER(digitalPinToPort(*TFT_LCD_ControlPins), PIO_OWER);
B_CB[iIndex] = digitalPinToBitMask(*TFT_LCD_ControlPins);

Like to replace the second paramater "registerSAM" symbol with a variable.

Here is a part of the compiler output with me using incorrect way to place the char* as a paramater:

sketch\A.h: In member function 'int TFT_LCD::TFT_LCD_AccessRegister(byte, char*, boolean, boolean, char*)':
sketch\A.h:31683:75: error: expected unqualified-id before '&' token
P_CB[iIndex] = portREGISTER(digitalPinToPort(*TFT_LCD_ControlPins),&(cRegisterType)); // PIO_ODSR); // STATUS register PIO_ODSR
^
sketch\AAA_SAMRegisters.h:21:49: note: in definition of macro 'portREGISTER'
#define portREGISTER(port,registerSAM) (&(port->registerSAM))

Any help would be appreciated.

"></pre>

Richard Andrew x641-Mar-16 5:58

Richard Andrew x64

1-Mar-16 5:58

Vaclav_Sal wrote:
#define portREGISTER(port,registerSAM) (&;(port->registerSAM))

Since you already have a & character in the macro definition, why do you have one in the macro call?

Vaclav_Sal wrote:
P_CB[iIndex] = portREGISTER(digitalPinToPort(*TFT_LCD_ControlPins),&(cRegisterType));

The difficult we do right away...
...the impossible takes slightly longer.

Vaclav_1-Mar-16 6:08

1-Mar-16 6:08

This was just an attempt to solve the problem, passing "just" char did not work either.
I thin I found a workaround / hack to fix this, but still like to know how to pass the symbol as a variable.

Richard MacCutchan1-Mar-16 10:52

1-Mar-16 10:52

I do not see any macro here, and I really cannot understand what all the above is supposed to do. It would really help, as I have suggested many times, if you showed the actual code clearly, and within <pre> tags so it is readable.

Vaclav_2-Mar-16 4:09

2-Mar-16 4:09

#define portREGISTER(port,registerSAM) (&(port->registerSAM))

Richard MacCutchan2-Mar-16 5:06

2-Mar-16 5:06

I think your excessive use of the addressof operator (&) is confusing the compiler.

Vaclav_3-Mar-16 4:34

3-Mar-16 4:34

And I think you really do not know the answer and just wasting your time.
If you bother to follow the thread I did mention I tested it without the & and it did not work.
I suppose since I did not use code tags correctly it is my fault.
Thanks, go back to policing the posts. You do that very well.

Have a nice day.

Richard MacCutchan3-Mar-16 5:29

Image size and location change at time of printing

3-Mar-16 5:29

Le@rner1-Mar-16 1:12

Re: Image size and location change at time of printing

1-Mar-16 1:12

hi all,

i draw a image when i preview it its display ok but at time of printing the image location and size is different. i really don understand whats going wrong here please help me for this.

i m using this to draw image.

Graphics graphics(pDC->GetSafeHdc());
	Image myPNG(path);
	if(myPNG.GetLastStatus()!=Ok)
	{
		return FALSE;
	}

	graphics.DrawImage(&myPNG, (INT)image_rect.left, (INT)image_rect.top, 300, 300);
	return TRUE;

thanks in advance.

Richard MacCutchan1-Mar-16 1:49

Re: Image size and location change at time of printing

1-Mar-16 1:49

Your size parameter values need to be scaled for output to a printer. When drawing to the screen 300 is the number of pixels, but when drawing to a printer it is the number of dots. See SetMapMode function (Windows)[^].

Le@rner1-Mar-16 17:32

Re: Image size and location change at time of printing

1-Mar-16 17:32

thanks its done.

Le@rner22-Mar-16 19:09

Re: Image size and location change at time of printing

22-Mar-16 19:09

sir now one more issue occur here when i print with multiple page.

on first page its drawimage correctly but after first page it return generic error.

i really dont understand what happen here.

please help me for this.

thanks in advance.

Richard MacCutchan22-Mar-16 23:01

Assert failure when I comment SetRegistryKey(_T("Local AppWizard-Generated Applications"))

22-Mar-16 23:01

I suggest you open a new question, and provide proper details of both code and error. You can help to isolate the problem by using your debugger to step through your code.

shanmugarajaa27-Feb-16 6:23

shanmugarajaa

27-Feb-16 6:23

Hi Friends,
My application don't want to create any entry in registry. If I comment SetRegistryKey(_T("Local AppWizard-Generated Applications")) then application throw an Assert failure. How to overcome from this problem.

Thanks,
S Shanmuga Raja

Re: Assert failure when I comment SetRegistryKey(_T("Local AppWizard-Generated Applications"))

Richard MacCutchan27-Feb-16 21:08