scanning until the EOF - C / C++ / MFC Discussion Boards

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Re: reduce the size of an array of chars....

jon-804-Sep-06 6:32

jon-80

4-Sep-06 6:32

I think the above line zero's the memory for l_Substring. I would like to remove what has not already been 'filled' within the function.

How do I add a NULL terminator btw?

Jon

Re: reduce the size of an array of chars....

Waldermort4-Sep-06 6:43

Waldermort

4-Sep-06 6:43

jon_80 wrote:
I think the above line zero's the memory for l_Substring. I would like to remove what has not already been 'filled' within the function.

When you memset with '0', you are filling the array with NULL terminators, so after you add your characters one by one there will be a NULL at the end.

jon_80 wrote:
How do I add a NULL terminator btw?

After you have added the last character, increase the pointer and make it = '0' instead of adding a character.

Re: reduce the size of an array of chars....

jon-804-Sep-06 8:11

jon-80

4-Sep-06 8:11

string CSentenceList::removeSubstring(char* strText, int iStart, int iNoOfChars)
The NULL is not started at the end of the string though...

{
int iLength = strlen(strText);
char l_Substring[MAX_SENTENCE_LENGTH];

// copy character by character till iStart
for (int iFirstCount = 0; iFirstCount < iStart; iFirstCount++)
{l_Substring[iFirstCount] = strText[iFirstCount];}

// copy from iContinue till the end of the text
int iContinue = iStart + iNoOfChars;
for (int iSecondCount = iContinue; iSecondCount < iLength; iSecondCount++, iFirstCount++)
{l_Substring[iFirstCount] = strText[iSecondCount];}

memset(l_Substring,0,MAX_SENTENCE_LENGTH); //resets l_Substring to ""
return (string) l_Substring;
}

Jon

Control handles

Oliver1234-Sep-06 6:17

Oliver123

4-Sep-06 6:17

I am finding references to control handles in VC++, but haven't yet found a definition. What is the handle? When I create an edit box, it returns a label of IDC_EDIT1, IDC_EDIT2, etc. Is this the handle? Is the handle the variable m_edit1 that I assign to he control?

Re: Control handles

Waldermort4-Sep-06 6:26

Waldermort

4-Sep-06 6:26

The handle for a control is commonly called the HWND <-- 'H' means Handle

Re: Control handles

gregdolley4-Sep-06 22:21

gregdolley

4-Sep-06 22:21

A handle (such as HWND or HANDLE) is simply typedef'ed to a long. It is a unique number assigned by the operating system to every window. When you create a window through the Win32 API, a handle is returned (HWND). Whenever you want to do something to that window you pass the HWND value to whatever Win32 function you're calling. Since MFC is basically a huge wrapper around the whole Win32 API, handles work the same way in MFC.

Your IDC_EDIT1, IDC_EDIT2, etc constants refer to the resource ID of a particular control. It is not the same as the handle. The resource ID is simply a number that the compiler uses when making resource files.

The control MFC classes (such as CEdit, CComboBox, etc.) all have a method called GetSafeHwnd() and a member called m_hWnd. Whenever you need a handle (HWND) of your control, just call GetSafeHwnd(). Or you can just grab the value of m_hWnd (it is public).

-Greg Dolley

Re: Control handles

Hamid_RT11-Sep-06 9:52

Hamid_RT

11-Sep-06 9:52

We have many handle in VC for example HWND window/HMENU menu /HDC Context_Device and... when you declare a variable for editbox this handle in Hierarchy Chart is CObject->CCmdTarget->CWnd->CEdit

WhiteSky

scanning until the EOF

Desmo164-Sep-06 6:15

Desmo16

4-Sep-06 6:15

Hi all,
I have the following code:

// CODE STARTS HERE //
int i,j;
std::fstream f_load;
char appoggio[20]; // carica il nan oppure il valore numerico
CString percorso;
CFileDialog fd(TRUE, NULL, percorso, OFN_FILEMUSTEXIST | OFN_HIDEREADONLY);
fd.m_pOFN->lpstrTitle = "Carica file di osservazioni";
if (fd.DoModal() == IDOK)
{
percorso = fd.GetPathName();
UpdateData(false);
f_load.open(percorso,std::ios::in);
int contatore = 0;
do{
f_load>>appoggio;
contatore++;
}
while(f_load!=EOF);
}

// CODE ENDS HERE //

but there's something wrong in the while condition.
Which is the right while condition to scan the file until its end ?
Thanx in advance,
Desmo16.

Re: scanning until the EOF

Waldermort4-Sep-06 6:30

Waldermort

4-Sep-06 6:30

In your loop, you are checking if the EOF has been reached at the end of the loop, but the pointer has already been increased causing your code not to go through the loop for the final time. You should test before entering the loop, ie

while (f_load != EOF)<br />
{<br />
   // do your loop<br />
}

Re: scanning until the EOF

Desmo164-Sep-06 6:40

Desmo16

4-Sep-06 6:40

I don't think it's that the matter,
because the compiler tells me it cannot convert
an int (the EOF) into a std::fstream (the f_load)

Re: scanning until the EOF

Waldermort4-Sep-06 6:49

Waldermort

4-Sep-06 6:49

Sorry, been a while since I used it. It think it should be

while (!f_load.eof() )<br />
{<br />
<br />
}

need help

amzeus4-Sep-06 6:04

amzeus

4-Sep-06 6:04

hi all i pretty new to C++ i have dwon loaded a project that i want to have a look at but not sure how to compile it it has files withthe follow extensions
aps
cpp
dsw
ncb
plg
h
rc
opt
clw

i am using windows xp sp2 and use Borland bcc55 under dos to compile
normally i go to doc promte and type

bcc32 <nameoffile>.c

then it makes the .exe

any help would be great

Re: need help

Cedric Moonen4-Sep-06 6:12

Cedric Moonen

4-Sep-06 6:12

It looks like a project done with VC6. Eventually, what you could do is create a new project with the IDE of your choice and add all the .h and .cpp files to your project.

Cédric Moonen
Software developer

Charting control [Updated - v1.1]

Re: need help

Hamid_RT4-Sep-06 22:32

Hamid_RT

4-Sep-06 22:32

It seems a project in VC6.0 whats problem with compile this project

WhiteSky

Sir,How Can Find or See WinMain Function in Simple MFC Application ?

CodeVarma4-Sep-06 5:54

CodeVarma

4-Sep-06 5:54

Sir,How Can Find or See WinMain Function in Simple MFC Application ?Pls help in understanding concept better. Smile | :)

Fly Like An Eagle With MIGHTY POWER.

Re: Sir,How Can Find or See WinMain Function in Simple MFC Application ?

Hamid_RT11-Sep-06 9:46

Hamid_RT

11-Sep-06 9:46

Can you be more specific what do you need?

WhiteSky

Animation of bitmaps

Fernando A. Gomez F.4-Sep-06 5:40

Fernando A. Gomez F.

4-Sep-06 5:40

Hi fellows. I've got to do an animation. I have 18 bitmaps and I have to animate them, simply, one after another one. I use a timer that calls InvalidateRect(NULL, FALSE) so that the window gets repainted (I do all the calculations in OnPaint to determine which is the next image of the sequence to be shown).

However, this is causing my window to flicker... How do I do to avoid such annoying problem?

Any help will be really appreciated. Thanks in advance.

Regards,
Fernando.

A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.

Re: Animation of bitmaps

Waldermort4-Sep-06 6:22

Waldermort

4-Sep-06 6:22

First, when you call InvalidateRect(), don't pass NULL. Calculate the correct rect of the bitmap and pass that.

Second, when you call InvalidateRect(), don't pass FALSE. You don't need to erase the background, this only causes the region to be painted twice.

Third, Use double buffering. Do all your drawing off screen then draw everything back to the screen in one go.

Re: Animation of bitmaps

Hamid_RT4-Sep-06 22:30

Hamid_RT

4-Sep-06 22:30

You can also use from a avi file in your program with create your graphic files into a avi file

WhiteSky

Re: Animation of bitmaps

Fernando A. Gomez F.5-Sep-06 5:05

Fernando A. Gomez F.

5-Sep-06 5:05

Thanks, I thought so at first, however, MFC for CE does not support CAnimationCtrl... Indeed, I solved the problem by creating a CWnd-derived window, and I placed the animation in there. Since it's a window in its own, it does not flicker at all.

Regards,
Fernando.

A polar bear is a bear whose coordinates has been changed in terms of sine and cosine.

Profiling in VS6.0 and VS.Net 2K5

cpp_prgmer4-Sep-06 4:45

cpp_prgmer

4-Sep-06 4:45

I have added the options Enable Profiling and Generate Mapfile to the link options of the resp projects I would like to profile and rebuilt the proj. But still I do not have the profile menu item in my build menu activated. cud someone point me out where I am going wrong?
Also what is the procedure to enable profiling in VS9.0, cud someone provide me the step-wise procedure?

Thanks and in anticipation of an early reply.

TWAIN sample

majco3334-Sep-06 4:09

majco333

4-Sep-06 4:09