Re: FILE I/O updating - C / C++ / MFC Discussion Boards

Re: transparent printing problem with hp plotter and gdi+

Shog⁹18-Jul-05 12:31

18-Jul-05 12:31

Probably a driver issue. Try drawing to a memory bitmap, then blitting this to the printer DC (assuming the printer driver supports blitting).

----------------------------------------
the ocean is full because everyone's crying

Re: transparent printing problem with hp plotter and gdi+

navajo_2k19-Jul-05 0:05

navajo_2k

19-Jul-05 0:05

Yes, it's probably a driver issue...

But this just a little demo i wrote... actual i tested it for our GIS-Software...
and there i can't just draw it into a membitmap...the memory would blow up^^
btw. pls. excuse my bad english...)

How to Take Input from MS flex Grid

Ritu Kwatra18-Jul-05 1:41

Ritu Kwatra

18-Jul-05 1:41

Hi all,
I am using MS flex grid to show my application data. There is a point when I need to Input from the user so that I can proceed the working. What I am doing is I have placed an edit box control at design time. Then I get pointer to it using GetDlgItem. and then I am calling SetWindowPos function to display it on a specific cell of the grid. But the edit box do not get displayed.
My code looks like:
CEdit *m_pEditValue = (CEdit*) GetDlgItem(IDC_EDIT_VALUE);
m_pEditValue->SetWindowText("Displayed");
m_pEditValue->SetWindowPos(&wndTop,m_flexgrid.GetCellLeft(),m_flexgrid.GetCellTop(),m_flexgrid.GetCellWidth(),m_flexgrid.GetCellHeight(),SWP_SHOWWINDOW);

The program does not give any error but It does not show the edit box. I think it is behind the grid and that means &wndTop is not making it a topmost window.

Any suggestion please ? Confused | :confused:

Thanx in advance.

Ritu Kwatra

FILE I/O updating

Halawlaws18-Jul-05 1:27

Halawlaws

18-Jul-05 1:27

hi i have used:
FILE *new = fopen("bla.txt","r+");
to edit a file that i have created earlier.

i need now to delete the last line in the file and add a new one.

How can i do that without overwriting the old line?

/\|-||\/|/\|)

Re: FILE I/O updating

David Crow18-Jul-05 2:43

David Crow

18-Jul-05 2:43

Halawlaws wrote:
i need now to delete the last line in the file and add a new one.

How can i do that without overwriting the old line?

These two requirements contradict each other. Deleting a line and replacing it with another is the same as overwriting.

If the old and new lines are the same length, just use fseek() to position the file pointer to the beginning of the line. Otherwise, you'll need to read each line in the file into a temporary file sans the last line. Write the new line to the temporary file. Close both files. Delete the original file. Rename the temporary file. Make sense?

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: FILE I/O updating

Halawlaws18-Jul-05 3:05

Halawlaws

18-Jul-05 3:05

hey

I can't use fseek coz they have different size so i will try the second method only how can i delete the original file and rename the temporary one.
What functions do i use?

/\|-||\/|/\|)

Re: FILE I/O updating

David Crow18-Jul-05 3:11

David Crow

18-Jul-05 3:11

Halawlaws wrote:
...how can i delete the original file and rename the temporary one.
What functions do i use?

remove() and rename() come to mind.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Re: FILE I/O updating

Halawlaws18-Jul-05 4:46

Halawlaws

18-Jul-05 4:46

Thx for ur help man but take it easy I am not an expert

/\|-||\/|/\|)

Get Application Path

Abd.Eskandari18-Jul-05 1:20

Abd.Eskandari

18-Jul-05 1:20

How can i get application path?

Re: Get Application Path

Trollslayer18-Jul-05 1:32

Trollslayer

18-Jul-05 1:32

Use GetCommandLine(), first value is the executable path.

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Re: Get Application Path

Andrew Kirillov18-Jul-05 1:34

Andrew Kirillov

18-Jul-05 1:34

Hello

You can extract it from module file name (GetModuleFileName).

Andrew

Re: Get Application Path

T.T.H.18-Jul-05 23:47

T.T.H.

18-Jul-05 23:47

<br />
char BufferApplicationFile[MAX_PATH] = {0};<br />
if (GetModuleFileName(AfxGetInstanceHandle(), BufferApplicationFile, MAX_PATH) == 0) {<br />
  // error<br />
}<br />

Re: Get Application Path

ThatsAlok19-Jan-06 23:01

ThatsAlok

19-Jan-06 23:01

abd.Eskandari wrote:
How can i get application path?

TCHAR str[MAX_PATH];
			GetModuleFileName(NULL,str,MAX_PATH);
			OutputDebugString(str);
			TCHAR szFileName[MAX_PATH];
			_splitpath(str,NULL,NULL,szFileName,NULL);

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV

what does "close wait" and "fin_wait2" means?

awah18-Jul-05 1:14

awah

18-Jul-05 1:14

[CODE]http://img301.imageshack.us/img301/5328/closewait0lw.jpg[/CODE]

1. what does "close wait" means?
2. what does "fin_wait2" means?

i understand that these are socket status but
- what do they mean? the socket is waiting for server? the socket is shutting down but waiting for certain event to happen before it's allowed to shutdown?
- what situations causes them?
- it seems that the socket is waiting for something, how can i stop the close wait/fin_wait2 and shutdown the socket? (gracefully or forcefully)

it seems that sockets on "close wait" and "fin_wait2" on my program are the ones with problems

please advise

spinner control makes dots in number within edit box

T.T.H.18-Jul-05 0:48

T.T.H.

18-Jul-05 0:48

Hi
I do have a dialog with a spinner control which is "connected" to an edit box. That edit box is a "number" so the user can not enter any non-digit characters.

Now I click the edit box, enter the number "55555" and then press the up-button of the spinner control. The result (unfortunately) is, that the number is not "55556" but "55.556" (notice the dot in there).

How can I prevent the spinner control from inserting any dots in the number-text?!?

Thanks & Bye,
T.T.H.

P.S.: I coding an MFC v7.1 application with MS Visual Studio.NET 2003 v7.1.3088 on a German WindowsXP - my problem could be caused by the German number convention (e.x. "12.345.678,90") which I do NOT want to be used in any way in my application.

Re: spinner control makes dots in number within edit box

Jose Lamas Rios18-Jul-05 2:44

Jose Lamas Rios

18-Jul-05 2:44

T.T.H. wrote:
How can I prevent the spinner control from inserting any dots in the number-text?!?

There's a UDS_NOTHOUSANDS style that you can use for that. In the dialog properties editor, it shows as "No Thousands".

--
jlr
http://jlamas.blogspot.com/[^]

Re: spinner control makes dots in number within edit box

David Crow18-Jul-05 2:45

David Crow

18-Jul-05 2:45

Check the properties of the control (within the resource editor).

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

thanks!

T.T.H.18-Jul-05 23:44

T.T.H.

18-Jul-05 23:44

Thank you so much guys!

Sometimes I just need a nudge in the right direction Dead | X|

MFC, COM and RTC API

TheVictorious18-Jul-05 0:14

TheVictorious

18-Jul-05 0:14

Please have a look at this thread which I posted earlier (realized that my post perhaps suits equally well in the Visual C++ board as in the COM board):

http://www.codeproject.com/script/comments/forums.asp?forumid=1648#xx1165939xx[^]

CImage filling

Themis17-Jul-05 23:41

Themis

17-Jul-05 23:41

Hi there,

I'm trying to use a CImage in order to display some images in a window. I can easily load an image with Load() method, but what I want now is to create a (w x h) image (easy) and fill it with a color. How can I do this? I tried to use the following:

<br />
for (int x=0; x < width; ++x)<br />
  for (int y=0; y < height; ++y)<br />
     img.SetPixel(x,y,RGB(...));<br />

But of course, as I expected, it takes quite a few seconds to fill the image. Is there any faster way?

Thanks,
Themis

Re: CImage filling

Christian Graus18-Jul-05 0:17

Christian Graus

18-Jul-05 0:17

Can you get the HBITMAP of the image and put it in a HDC ? Then you can fill it all in one go.

Christian Graus - Microsoft MVP - C++

Re: CImage filling

Themis18-Jul-05 0:59

Themis

18-Jul-05 0:59

Thanks I'll try that!

column/bar chart

Marc Soleda17-Jul-05 23:16

Marc Soleda

17-Jul-05 23:16

What's the best solution for representing real time data in a column/bar chart?
I need to represent data (the speed of different instruments) that is updated every second. I'd prefer to display each speed in different columns and using 2 areas/colours for each one: 1st area/colour for the speed within the limits and a second area/colour when the speed is over limits but mantaining the first colour since the limit.
What's the best way to do that? AFAIK I can do it using MS Chart but I found it a bit limited. What about Dundas Chart? Any other solution to use with VC++6, MFC42?

Thanks in advance,
Marc Soleda

Clarification regarding memory management in multi thread

Ravi Sankar S17-Jul-05 23:10

Ravi Sankar S

17-Jul-05 23:10

Hello All,

There is a basic doubt in multi threading. I want to allocate memory in one thread and i want to use that memory in other thread and free in that thread.

Threoritically memory allocated in one thread using malloc / new function can not be freed using free / delete in other thread. It it correct?

The code I have given below
Language VC++ 6.0
OS: Windows 2000

typedef struct CapturedData {<br />
	long	m_lLength;<br />
	char	*m_pData;<br />
}NewCapturedData;<br />
<br />
// Global variable to store the data<br />
	CTypedPtrList <CPtrList, NewCapturedData*> g_oCapDataList;<br />
<br />
// First Thread Function<br />
LRESULT OnCaptureAddData (WPARAM wParam, LPARAM lParam) <br />
{<br />
	NewCapturedData *l_pCapData;<br />
<br />
	l_pCapData = new NewCapturedData;<br />
	l_pCapData->m_lLength = (long) lParam;<br />
	l_pCapData->m_pData = (char*) calloc (sizeof (char), (long)lParam);<br />
	if (!l_pCapData->m_pData) {<br />
		return FALSE;<br />
	}<br />
	memcpy (l_pCapData->m_pData, (char*) wParam, (long)lParam);<br />
	EnterCriticalSection (&m_oCapDataCriticalSession);<br />
	g_oCapDataList.AddTail (l_pCapData);<br />
	LeaveCriticalSection (&m_oCapDataCriticalSession);<br />
	PostThreadMessage (WM_CAPTURE_PROCESS_DATA, 0, 0);<br />
	return TRUE;<br />
}<br />
<br />
// Second Thread Function<br />
LRESULT OnProcessDataMsg (WPARAM wParam, LPARAM lParam)<br />
{<br />
	CapturedData *l_pCapData = g_oCapDataList.GetHead ();<br />
<br />
 // Do some ananlysis with data.<br />
<br />
        free (l_pCapData->m_pData);<br />
        l_pCapData->m_pData = NULL;<br />
        free (l_pCapData);<br />
        l_pCapData = NULL;<br />
}<br />

NOTE: Above code is part of code i have given, but orginal code is compiling and linking and executing.

The project is dealing with packet capturing and it has to take minimum memory and really fast.

Is it better idea to free in the second thread?

If the memory has to be freed in first thread? I am planning to post a message to first thread, to intimate first thread from 2nd thread when ananysis is complated to remove the memory!!!! For this approach i have to add "GetMessage" in First thread and depending on the message free the memory.

Can you please suggest which design is better?

Thanks for your time
Ravi

Re: Clarification regarding memory management in multi thread

David Crow18-Jul-05 2:47

David Crow

18-Jul-05 2:47

Ravi Sankar S wrote:
Threoritically memory allocated in one thread using malloc / new function can not be freed using free / delete in other thread. It it correct?

No, that is not correct.

"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.