How to insert/delete some content of text file fastly? - C / C++ / MFC Discussion Boards

Re: Named Pipes Vs Sockets

vikramlinux11-Mar-04 1:00

vikramlinux

11-Mar-04 1:00

Is there any performance Issue?

VikramS

.net application and C dll

mosquitooth10-Mar-04 21:39

mosquitooth

10-Mar-04 21:39

Hi,

my current project consists of a .net application (exe in VB.NET) and a VC++ DLL. Normally, I just call functions in the DLL out of my application, which works just fine. But sometimes I'd like to do it the other way round: to call functions in the .net application out of my C++- Code. Is this possible, and if so, how is it done?

Thanks a lot
mosquitooth

Re: .net application and C dll

Antti Keskinen10-Mar-04 22:21

Antti Keskinen

10-Mar-04 22:21

Hmm..

Considering that you can use the handle of a loaded DLL to get pointers to the exported functions inside, it would seem logical that the same procedure can be applied vice-versa.

When you load an application, you usually get an instance handle. Passing this instance handle out of the application context (thread) into a DLL's handler function (residing in another thread), should allow you to use GetProcAddress or a similar function to get the exported symbols of your .Net application.

This should be pretty easy to implement with MFC, just by using AfxGetInstanceHandle in the executable, and passing this handle over to the DLL, you can use the handle to get the exported symbols. But a case with VB .Net and VC++ DLL, I'm not sure. I don't know how you can export symbols from a VB.Net application/DLL. See the VB manual for instructions on this one.

But the outline of the procedure I mentioned should work. An additional problem may arise because the .Net application most obviously runs over the CLR, and is thus considered 'managed'. Passing a handle of a managed application to an unmanaged DLL might prove "interesting" results Smile | :)

All in all, try this out, and you'll see what happens..

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

Debugging symbols for Windows XP

rrrado10-Mar-04 21:15

rrrado

10-Mar-04 21:15

I have installed Visual C++ 6.0, in Windows XP. Installation gave me some debug symbols for Windows NT, but those are too old to be installed into WinXP.
Does anyone know where to get theese symbols for WinXP ?
It seems that I need it, because when my program crashes, I can't see call stack information Frown | :(

Thanks !

rrrado

PropertyPage Title

Florin Ochiana10-Mar-04 20:30

Florin Ochiana

10-Mar-04 20:30

How can I change the title of the PropertyPage in a propertysheet. I mean the name of the tab. I tried with SetWindowText() but it doesn't work.

Thanks

-----
We are what we repeatedly do. Excellence, then, is not an act, but a habit.

Re: PropertyPage Title

Prakash Nadar10-Mar-04 21:36

Prakash Nadar

10-Mar-04 21:36

Get the tabcontrol of the propertysheet and set the text of the corresponding item whose text you want to change.

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prakashnadar@msn.com

Re: PropertyPage Title

Antti Keskinen10-Mar-04 21:43

Antti Keskinen

10-Mar-04 21:43

A property sheet, when ran, consists of a property sheet object (the parent), a collection of property page objects (individual dialogs) and a tab control used to switch between the pages. During the first creation stage, the tab texts are taken from the dialog template titles. Changing these pre-build will alter the tab texts.

During run-time, you can change the title by first getting the property sheet object, then asking for the tab control via GetTabCtrl. A CTabCtrl class has a method called SetItem that takes the index of the page and a TCITEM structure.

Assuming in the following example, that m_wndPropertySheet was a pointer to CPropertyPage class, this code fragment will alter the text of the first tab

// Get the tab control
CTabCtrl* m_ptrTab = m_wndPropertySheet->GetTabCtrl();<DIV>

// Construct a TCITEM structure
TCITEM ti;
ti.mask = TCIF_TEXT;
ti.pszText = "New tab text";<DIV>

// Alter the text
m_ptrTab->SetItem( 0, &ti );

Hope this will help you out. Naturally, if you are unsure where the correct page is, you can use GetItem ínstead of SetItem to get the item's text and determining the index from there...

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

How to insert/delete some content of text file fastly?

freehawk10-Mar-04 20:25

freehawk

10-Mar-04 20:25

Hello everyone:

I have some big size text files, How to insert/delete some content of text file fastly?

Thank you

-Freehawk

Re: How to insert/delete some content of text file fastly?

rrrado10-Mar-04 21:19

rrrado

10-Mar-04 21:19

I don't believe that there is some faster way how to insert/delete some data in the middle of the file, than moving data at the end of the file by blocks

(If you need to insert/delete blocks which size is exactly as big as size of allocation unit, you could do this by manipulating FAT/NTFS tables, but this is little but difficult Smile | :)

Re: How to insert/delete some content of text file fastly?

freehawk10-Mar-04 22:17

freehawk

10-Mar-04 22:17

Thank you for the fast reply.

Is it really that there is no way to do faster?

Oh. Cry | :((

-Freehawk

Re: How to insert/delete some content of text file fastly?

David Crow11-Mar-04 2:58

David Crow

11-Mar-04 2:58

You did not say how big the file is, but it is conceivable to read the file into a CString variable, make the necessary modifications, and write the CString variable back out to the file. Depending on how you want to alter the data, using a LPBYTE type instead of a CString object is also possible.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

convert double to char!

catngo10-Mar-04 19:57

catngo

10-Mar-04 19:57

how do you convert double to char? i mean to keep it the way it is as double for display.
exp: 3.5 will be 3.5 as char (maybe to CString or array since this is 3 characters)

Re: convert double to char!

Monty²10-Mar-04 20:09

Monty²

10-Mar-04 20:09

CString str;
double dblValue = 2.25;

str.Format("%0.2f",dblValue);
//0.2 means 2 chars after decimal

Hope it helps Smile | :)

C makes it easy to shoot yourself in the foot; C++ makes it harder, but when you do, it blows away your whole leg

Re: convert double to char!

catngo10-Mar-04 20:12

catngo

10-Mar-04 20:12

thank you!

Re: convert double to char!

Ellis Li10-Mar-04 20:14

Ellis Li

10-Mar-04 20:14

If you use CString to store the value, try the "format" method.
If you use char * , try to use "sprintf".
If the result will put into unicode string, try "swprintf"

Ellis Li

m_pRecentFileList...

Neha10-Mar-04 19:19

Neha

10-Mar-04 19:19

Hi,

In my application I get the recent opened file from m_pRecentFileList variable. Here is the code

CString the_File=(*m_pRecentFileList)[0];
OpenDocument(the_File);

In OpenDocument I have
pDoc->Load(CComVariant(lpszPathName));

Here it always fails.

But If I give the path directly,

ie CString the_File="c:\\text.abc"

It works fine.

Regards
Neha

Re: m_pRecentFileList...

Prakash Nadar10-Mar-04 23:33

Prakash Nadar

10-Mar-04 23:33

Neha wrote:
pDoc->Load(CComVariant(lpszPathName));

what is the document type of pDoc?

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prakashnadar@msn.com

Re: m_pRecentFileList...

Neha10-Mar-04 23:43

Neha

10-Mar-04 23:43

pDoc is an XMLDocument object:

Here is the source:

IXMLDOMDocument *pDoc;

CoCreateInstance(CLSID_DOMDocument, NULL, CLSCTX_INPROC_SERVER,
IID_IXMLDOMDocument, (void**)&pDoc)

Re: m_pRecentFileList...

David Crow11-Mar-04 3:14

David Crow

11-Mar-04 3:14

Neha wrote:
OpenDocument(the_File);

Have you put a breakpoint on this statement to see the value of the_File?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Make underline on menu

Member 80845910-Mar-04 19:10

Member 808459

10-Mar-04 19:10

Hi all,

For example &File. If you press Alt + 'F' the file menu opens. ... I would like the underline to always display

Thanks all

Re: Make underline on menu

Roger Allen11-Mar-04 0:49

Roger Allen

11-Mar-04 0:49

This is a new configurable setting of windows XP. You have to change the OS options under your display settings.

Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...

Re: Make underline on menu

David Crow11-Mar-04 3:15

David Crow

11-Mar-04 3:15

Roger Allen wrote:
This is a new configurable setting of windows XP.

It's also present in Windows 2000.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Using C# controls in MFC Dialog

Jain Mohit10-Mar-04 18:47

Jain Mohit

10-Mar-04 18:47

Is it possible to use C# controls in a MFC Dialog based application. I have a C# control of a fancy button, and want to add this button on the MFC Dialog. Any help in this context will be much appreciated.
Regards

How to check a folder existed or not ?

nguyen_nd10-Mar-04 18:05

nguyen_nd

10-Mar-04 18:05

Hi everybody, please tell me how to check a folder existed or not.
Ex:
BOOL CheckExistedFolder(CString strFolderName);
It returns
TRUE : Existed
FALSE : Not existed
Thank a lot !

nguyen_nd

Re: How to check a folder existed or not ?

Ravi Bhavnani10-Mar-04 19:05

Ravi Bhavnani

10-Mar-04 19:05

Here you go.

//! Checks whether a directory exists.
//@param  strDirectory  Directory
//@return true if the directory exists, false otherwise.
bool dirExists
  (CString strDirectory)
{
  // Create full directory specification - return if unable
  TCHAR* fullPath = _tfullpath (NULL, strDirectory, 0);
  if (fullPath == NULL)
     return (false);
 
  // Check if directory exists by trying to make it the default directory
  TCHAR szCurrDir [_MAX_PATH];
  _tgetcwd (szCurrDir, _MAX_PATH - 1);
  long nStatus = _tchdir (fullPath);
  _tchdir (szCurrDir);
 
  // Return
  free (fullPath);    
  if (nStatus == 0)
     return (true);
  return (false);
}

/ravi

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