C / C++ / MFC

Re: How to get pointer to client area in CDialog in SDI app??

9-Oct-07 9:22

Hi, i have SDI app with dialog based on CDialog class. I need to get pointer to client area to set some properties.

Iain Clarke, Warrior Programmer9-Oct-07 10:07

Iain Clarke, Warrior Programmer

9-Oct-07 10:07

zarraza wrote:
Hi, i have SDI app with dialog based on CDialog class

Do you have a dialog based app, or a SDI app, with the view based from CFormView? These are different things.

As for your second question, can't you not use
CWnd::GetDC / ReleaseDC?

What sort of properties are you talking about?

Re: How to get pointer to client area in CDialog in SDI app??

zarraza9-Oct-07 10:37

Re: How to get pointer to client area in CDialog in SDI app??

9-Oct-07 10:37

For simplify this lets say it is a SDI app with the view based on CFormView (if needet can be CDialog based).
In this view i want to set size of client area, because on client area i have to put dynamicaly variable number of buttons, and client area size have to be enought big, sometimes even bigger then screen size.
I don't know if GetDC/ReleaseDC can help resolve my problem.

Iain Clarke, Warrior Programmer9-Oct-07 11:05

Iain Clarke, Warrior Programmer

9-Oct-07 11:05

oninitdialog / getclientrect

Re: How to get pointer to client area in CDialog in SDI app??

zarraza9-Oct-07 11:25

Re: How to get pointer to client area in CDialog in SDI app??

9-Oct-07 11:25

I don't know if i understand MSDN corectly, but there is said that GetClientRect() just return coordinates of client area respectively to window area, not handler of client area.

Iain Clarke, Warrior Programmer9-Oct-07 11:30

Iain Clarke, Warrior Programmer

9-Oct-07 11:30

That is true - but the only thing you'll care about is the rectangle's width

or you can use MapWindowRect....

Iain.

Re: How to get pointer to client area in CDialog in SDI app??

zarraza9-Oct-07 11:50

Re: How to get pointer to client area in CDialog in SDI app??

9-Oct-07 11:50

If i add a button dynamicaly which is outside client area, the scroll bars doesn't appear and i have to resize window manually(by clicking mouse in corner at runtime) to see this button. It has to be a way to make those scrollbars visible and scrolling very big client area (eg if i want 1000 buttons on dialog or very big image).

Roger Broomfield9-Oct-07 15:29

Roger Broomfield

9-Oct-07 15:29

CFormView is based on CScrollView. Normally you would call ResizeParentToFit at some point (or MFC will do it for you), what you want to do is provided by a call to SetScrollSizes after you add this "button which is outside the client area".

Re: How to get pointer to client area in CDialog in SDI app??

zarraza10-Oct-07 11:41

vc++code for designing a scientific calculator

10-Oct-07 11:41

Thank you Roger i search for this solution for few days and couldn't find nothing usefull. I love You man.

AvishekBanerjee9-Oct-07 5:24

AvishekBanerjee

9-Oct-07 5:24

Design a calculator, which should have the following:
sin x, cos x, tan x, Sq Root
Along with standard features and memory facility(M+,M-,MR,MC)

avishekbanerjee

David Crow9-Oct-07 5:42

David Crow

9-Oct-07 5:42

This is a good assignment. Report back when you are done and tell us how it went.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

toxcct9-Oct-07 5:44

toxcct

9-Oct-07 5:44

and you expect us to do your homework ?

bad pupil Poke tongue | ;-P

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Maximilien9-Oct-07 6:45

Maximilien

9-Oct-07 6:45

ok.

Maximilien Lincourt
Your Head A Splode - Strong Bad

Mark Salsbery9-Oct-07 8:12

Mark Salsbery

9-Oct-07 8:12

Done.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Hamid_RT9-Oct-07 9:44

Hamid_RT

9-Oct-07 9:44

It enters to stack you must wait for it(FIFO).

Hamid_RT9-Oct-07 9:54

Hamid_RT

9-Oct-07 9:54

See An MFC Calculator Custom Control with No Resource File Dependencies[^]
but next time ask for specific question and also use of a simple search.

toxcct9-Oct-07 21:25

toxcct

9-Oct-07 21:25

Hamid. wrote:
but next time ask for specific question and also use of a simple search

yes, but next time, don't give help to lazy people like that guy who didn't even make the effort of searching the web and the codeproject by itself

[VisualCalc][Binary Guide][CommDialogs] | [Forums Guidelines]

Theory question about "void pBuffer"

Hamid_RT10-Oct-07 7:06

Hamid_RT

10-Oct-07 7:06

I'm agree with you if I could search so he/she could search himself/herself but I guess maybe he/she needs to this help.;)

Nelek9-Oct-07 4:38

Re: Theory question about "void pBuffer"

9-Oct-07 4:38

Hi,

When using a buffer to intermediary help to make use of some functions…

If I want to have in the buffer the content of an Array, then I make:

pBuffer = &Array[0];  // or the same: pBuffer = Array;
file->Write (pBuffer , sizeof (Array));

And there is no problem because the array allocates contiguous memory to hold the members and the pointer says where the Array starts, and with the “size of (Array)” I say how many elements have to be written.

But doing the opposite…

::RegQueryValueEx (hWkKey, "SubKey", 0, &dwType, pBuffer, &lnLength); // Read the contents
if (dwType == REG_SZ)	// The registry value is a string, it could be something else though so we better make sure
	szValue = pBuffer;

else if (dwType == REG_BINARY)
	for (int i = 0; i < lnLength; i++)
		Array[i] = *(pBuffer + i);

delete [] pBuffer;
pBuffer = NULL;

The usual assignation works with the string because internally is like a char* and then both uses the start direction to allocate the data in their place till a '\0' is founded, but it should be made using a for when writing the data into the array because there is no way to say how long the array is (like '\0' by the char*) (isn't it?)

Array = *pBuffer;	//error C2440: impossible to convert from 'unsigned char' in 'unsigned char [1252]' 
;	//the fixed size from array makes problems
//or
&Array = pBuffer;	//error C2440: impossible to convert from 'unsigned char *' in 'unsigned char (*)[1252]' 
//or
Array = pBuffer;	//error C2240: impossible to convert from 'unsigned char *' in 'unsigned char [1252]'
//or
&Array[0] = pBuffer;	//error C2109: Left operator must be a "L-Value"
;	//MSDN says "The subscript was used on a variable that was not an array", does it means that a whole array is trying to be placed in one element??

The meaning of the errors (but C2109) and the reason to have them is clear, but...

Is there any other possibility to do it, or the “for” must be used?

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

Wink | ;)

led mike9-Oct-07 5:00

led mike

9-Oct-07 5:00

I am not sure what your question is but have a look at memcpy(...)

Re: Theory question about "void pBuffer"

Nelek10-Oct-07 0:27

Re: Theory question about "void pBuffer"

10-Oct-07 0:27

I have taken look to the documentation and it seems to be what I asked for. But...

Quote:
"The memcpy function copies count bytes of src to dest. If the source and destination overlap, this function does not ensure that the original source bytes in the overlapping region are copied before being overwritten. Use memmove to handle overlapping regions."

but in the example both makes exactly the same,

//Output of example code 1
Function:   memmove with overlap
Source:      quick brown fox jumps over the lazy dog
Destination:   brown fox jumps over the lazy dog
Result:      The quick quick brown fox jumps over the lazy dog
Length:      49 characters

//output of example code 2
Function:   memcpy with overlap
Source:      quick brown dog jumps over the lazy fox
Destination:   brown dog jumps over the lazy fox
Result:      The quick quick brown dog jumps over the lazy fox
Length:      49 characters

then... why is it said?

Can you tell me an example where the quote of MSDN is true?

led mike10-Oct-07 4:46

led mike

10-Oct-07 4:46

Nelek wrote:
then... why is it said?

what is "what" said? The part about overlapping source and destination? ????

Re: Theory question about void pBuffer

Nelek10-Oct-07 20:45

Re: Theory question about void pBuffer

10-Oct-07 20:45

Yes, what I write in quote.

It is supposed to give problems while overlapping, but the code that they put in the example (I paste some parts)

char string1[60] = "The quick brown dog jumps over the lazy fox";
char string2[60] = "The quick brown fox jumps over the lazy dog";
/*                           1         2         3         4         5
 *                  12345678901234567890123456789012345678901234567890
 */

//Other function

   printf( "Function:\tmemmove with overlap\n" );
   printf( "Source:\t\t%s\n", string2 + 4 );
   printf( "Destination:\t%s\n", string2 + 10 );
   memmove( string2 + 10, string2 + 4, 40 );
   printf( "Result:\t\t%s\n", string2 );
   printf( "Length:\t\t%d characters\n\n", strlen( string2 ) );

   printf( "Function:\tmemcpy with overlap\n" );
   printf( "Source:\t\t%s\n", string1 + 4 );
   printf( "Destination:\t%s\n", string1 + 10 );
   memcpy( string1 + 10, string1 + 4, 40 );
   printf( "Result:\t\t%s\n", string1 );
   printf( "Length:\t\t%d characters\n\n", strlen( string1 ) );

gives the results that I worte in the message above, and both are making exactly the same and working good. So I don't understand where the problem is. If I could see an example where the quote is true, then I would understand it better.

led mike11-Oct-07 4:59

led mike

11-Oct-07 4:59

Nelek wrote:
If I could see an example where the quote is true, then I would understand it better.

If the source and destination overlap, this function does not ensure that the original source bytes in the overlapping region are copied before being overwritten.

memmov "does" ensure that the original source bytes are copied before being overwritten.

There is no certain way to give an example where it memcpy fails because the results are not guaranteed. You would have to try experimenting to find a condition where it might fail repeatedly.

Also your documentation appears dated check this out[^]

Re: Theory question about void pBuffer

Nelek12-Oct-07 1:59