C / C++ / MFC

Re: Need help on how to move line between two horizontal sliders with slider position

17-Feb-09 0:01

Hi,
I have tried with your solution, I am calling m_pDlg->m_slider_bar1.GetWindowRect(&rect1); this control from my app for getting pixels position.
after that i am trying to change the slider position like below mentioned way:
int pos = m_pDlg->m_slider_bar1.GetPos();
m_pDlg->m_slider_bar1.SetPos(slide_pos);
m_pDlg->m_slider_bar2.SetPos(slide_pos);

every time i am getting rectangle pixels like :- 86,110,283,565 only.
how i have to move line now to moved position.

please kindly help me regarding this..

Thanks in advance..

modified on Tuesday, February 17, 2009 10:18 AM

«_Superman_»17-Feb-09 1:06

Re: Need help on how to move line between two horizontal sliders with slider position [modified]

17-Feb-09 1:06

If slider range has been set from 0 to 100 and SetPos returns 50, you know that it is 50%.
So the position of the tic is at (283 - 86) / 2.
Now you can do a MoveTo and LineTo from X1 which is ((283 - 86) / 2, bottom of slider1) to X2 which is at ((283 - 86) / 2, top of slider 2).

«_Superman_»

John50217-Feb-09 1:38

Re: Need help on how to move line between two horizontal sliders with slider position

17-Feb-09 1:38

Hi Superman,
I have written the code like this, but still it's not working
while (slide_pos <= 100)
{
m_pDlg->m_slider_bar1.GetWindowRect(&rect1);
m_pDlg->m_slider_bar2.GetWindowRect(&rect2);
int pos = m_pDlg->m_slider_bar1.GetPos();
m_pDlg->x1 = ((rect1.left-rect1.top)/100);
m_pDlg->y1 = rect1.bottom;
m_pDlg->x1 = ((rect1.left-rect1.top)/100);
m_pDlg->y2 = rect2.top;
m_pDlg->m_slider_bar1.SetPos(slide_pos);
m_pDlg->m_slider_bar2.SetPos(slide_pos);
slide_pos = slide_pos + 5;
m_pDlg->InvalidateRect(NULL);
Sleep(1000);
}
rect1 values are :- top=86,bottom=110,left=283,right=565
rect2 values are :- top=259,bottom=283,left=283, right=565.
Can you please look into the code what i have written and let me know where i did wrong..?

modified on Tuesday, February 17, 2009 10:18 AM

«_Superman_»17-Feb-09 2:29

Re: Need help on how to move line between two horizontal sliders with slider position [modified]

17-Feb-09 2:29

It looks like I have mis-interpreted your question.
Let me try and get it right.

You have 2 sliders.
When one of the slider is moved you want the other one also to move along.
Is that what you need?

«_Superman_»

John50217-Feb-09 2:52

Re: Need help on how to move line between two horizontal sliders with slider position

17-Feb-09 2:52

Hi,
Yes that is only the part of my requirement. I have two horizontal sliders on my dialog. Now i want to create one verical line in between the two sliders.
Whenever i have clicked on Start button then slider tics will get moved and incremented by 5, i am able to move two slider tics at the same time.
but now what i want is to move line along with the tics. I am not able the slider position where it is exactly moved in terms of pixels.

modified on Tuesday, February 17, 2009 10:29 AM

«_Superman_»17-Feb-09 19:10

Re: Need help on how to move line between two horizontal sliders with slider position

17-Feb-09 19:10

You can get the (x1, y1) and (x2, y2) positions for drawing the line using the following code

m_slider1.GetThumbRect(&rect1);
m_slider2.GetThumbRect(&rect2);

m_slider1.ClientToScreen(&rect1);
m_slider2.ClientToScreen(&rect2);

ScreenToClient(&rect1);
ScreenToClient(&rect2);

<span style="color:blue">int</span> x1 = rect1.left + ((rect1.right - rect1.left) / 2);
<span style="color:blue">int</span> y1 = rect1.bottom;
<span style="color:blue">int</span> x2 = x1;
<span style="color:blue">int</span> y2 = rect2.top;

Then you can draw the line using the following code

CDC* pDC = GetDC();

CPen pen(PS_SOLID, 1, RGB(0, 0, 0));
pDC->SelectObject(&pen);

pDC->MoveTo(x1, y1);
pDC->LineTo(x2, y2);

ReleaseDC(pDC);

You may need to erase the previously drawn line.
For that you will need to store the previous line coordinates and draw over it using the same color of the dialog.

«_Superman_»

John50217-Feb-09 23:24

Re: Need help on how to move line between two horizontal sliders with slider position

17-Feb-09 23:24

Hi Superman,
Thanks for your effort on this..I am able to move slider position correctly, but not able to move along with the sliders, below i am copying my code snippet, please review it and let me know where i am doing wrong..?

Below code i have written in OnStart funciton():-

int slider_pos = 5;

while(slider_pos <= 50)
{
m_slider1.GetThumbRect(&rect1);
m_slider2.GetThumbRect(&rect2);

m_slider1.ClientToScreen(&rect1);
m_slider2.ClientToScreen(&rect2);

ScreenToClient(&rect1);
ScreenToClient(&rect2);

m_slider1.SetPos(slider_pos);
m_slider2.SetPos(slider_pos);

int x1 = rect1.left + ((rect1.right - rect1.left) / 2);
int y1 = rect1.bottom;
int x2 = x1;
int y2 = rect2.top;

slider_pos += 5;

InvalidateRect(rect1,FALSE);
InvalidateRect(rect2,FALSE);

Sleep(1000);
}

Below i have written in OnPaint()
CDC* pDC = GetDC();

pDC->MoveTo(old_x1,old_y1);
pDC->LineTo(old_x2,old_y2);

pDC->MoveTo(x1,y1);
pDC->LineTo(x2,y2);

old_x1 = x1;
old_y1 = y1;
old_x2 = x2;
old_y2 = y2;
Please help me regarding this..?

Thanks in advance..

«_Superman_»17-Feb-09 23:35

Re: Need help on how to move line between two horizontal sliders with slider position

17-Feb-09 23:35

You are using x1, y1, x2 and y2 in 2 functions.
I'm assuming you're creating the variables as member variables.
If so remove the int keyword from within the while loop.

Also, in OnPaint you must call BeginPaint instead of GetDC.
And instead of 2 InvalidateRect calls, do a single Invalidate call.

«_Superman_»

John50218-Feb-09 1:08

Re: Need help on how to move line between two horizontal sliders with slider position

18-Feb-09 1:08

Hi,
I made these changes,
PAINTSTRUCT ps;
CDC* paintDC = BeginPaint(&ps);

//paintDC->MoveTo(old_x1,old_y1);
//paintDC->LineTo(old_x2,old_y2);

paintDC->MoveTo(x1,y1);
paintDC->LineTo(x2,y2);

old_x1 = x1;
old_y1 = y1;
old_x2 = x2;
old_y2 = y2;

EndPaint(&ps);
but line is displaying at last slider position, that to in wrong pixels..
can you please tell me where i am doing wrong..?
Thnaks in advance..

John50217-Feb-09 1:01

CHttpFile->Read = not enough storage is available to process this command

17-Feb-09 1:01

Hi
Can you please kindly help me on this ASAP, as it is very urgent requirement for me..

Protocol Design

septane16-Feb-09 22:22

septane

16-Feb-09 22:22

Hi all....as a part of my undergraduate project, i've to design a protocol for streaming audio to another system in a LAN...that protocol should be a layer 2 protocol...can anyone tel me how to implement this and where can i get sample protocol source code and stuffs???? thanks in advance...

Re: Protocol Design

Cedric Moonen16-Feb-09 22:48

Cedric Moonen

16-Feb-09 22:48

Start on yoursefl, make some research on google and once you are stuck on a specific point, come back and ask a specific question. BTW, read the "How to get an answer to your question" post on top of this forum.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Psyinx16-Feb-09 20:21

Re: CHttpFile->Read = not enough storage is available to process this command

16-Feb-09 20:21

Hi guys,

I have a frustrating issue that has just cropped up about a week ago. Confused | :confused:

I have a piece of code which downloads a file via HTTP and saves it to disk.

This code has been working perfectly for the last year on a server, now all of a sudden the call to CHttpFile->Read throws an
exception "Not enough storage is available to process this command".

The server has more than enough memory available (machine has 4gig, of which roughly 1gig is being used at any given time).
It has 12 gig hd space free, drive quota is turned off, and the page file is set to 3 gig min, 4 gig max.

Even straight after a restart, the code still throws the exception.

The file size over the last year has grown from 40meg to 65meg, and that same piece of code is able to download a small 1meg file on the server no problem.

The only bit of advice i have been able to google is that of increasing the IRPStack size, which aparently should fix issues such as this, but unfortunately this does not appear to fix my issue.

If any of you have had any other similar issue, and know of a solution to this problem, please let me know!

Thanks.

Stuart Dootson16-Feb-09 21:13

Stuart Dootson

16-Feb-09 21:13

How are you calling CHttpFile::Read?
Have you tried single-stepping through the CHttpFile::Read function (you will be able to if you've got the MFC source installed) to see what underlying function causes the exception to be thrown?

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: CHttpFile->Read = not enough storage is available to process this command

Psyinx16-Feb-09 21:24

Re: CHttpFile->Read = not enough storage is available to process this command

16-Feb-09 21:24

Here's the code snippet that reads the file:

BYTE *pData = new BYTE[dwRemoteSize];
pHttpFile->Read(pData, dwRemoteSize);

and dwRemoteSize is set via:

pHttpFile->QueryInfo(HTTP_QUERY_FLAG_NUMBER|HTTP_QUERY_CONTENT_LENGTH, &dwRemoteSize, &dwLen, 0)

I have stepped through the code on my dev box, however the dev box does not throw this exception. It appears to be related purely to the server box.. Confused | :confused:

Stuart Dootson16-Feb-09 23:08

Stuart Dootson

16-Feb-09 23:08

I've just done some investigation on my dev box (with Apache 2.2 as a web server).

This indicates that CHttpFile::Read doesn't want to read more than 67,151,821 bytes at a time. However, it would seem you can read the file in chunks, the same way you would off disk, something like:

unsigned __int64 totalRead(0);
while (1)
{
   const DWORD toRead = 1<<20;
   const DWORD nRead = httpFile->Read(pData + totalRead, toRead);
   totalRead += nRead;
   if (nRead != dwRemoteSize) break;
}
_ASSERTE(totalRead == dwRemoteSize);

HTH!!!

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: CHttpFile->Read = not enough storage is available to process this command

Psyinx17-Feb-09 0:01

Re: CHttpFile->Read = not enough storage is available to process this command

17-Feb-09 0:01

Interesting Big Grin | :-D

I'll give it a spin and let you know!

Psyinx17-Feb-09 3:29

17-Feb-09 3:29

Fantastic

Got the file to download in chunks! Thanks for your help Stuart!

CSIDL_SYSTEM

john563216-Feb-09 19:58

john5632

16-Feb-09 19:58

Hi,

I am using SHGetSpecialFolderPath with CSIDL_SYSTEM to get system folder path. But for Window32 and Window64 I am getting the same path "C:\Windows\System32" But I window64 I should be "C:\Windows\SysWOW64"

What is the problem?

Re: CSIDL_SYSTEM

Stuart Dootson16-Feb-09 21:20

Stuart Dootson

16-Feb-09 21:20

Nope - this page[^] says that you use CSIDL_SYSTEMX86 to get the WOW64 directory.

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: CSIDL_SYSTEM

«_Superman_»16-Feb-09 21:21