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how can I iterate file pointer within a file consisting list of file.
that is, when ever it iterates i get next list file using vc++(mfc)
kamalesh
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You can use CFileFind to list the files on a local disk. If you already have filenames listed in a single file, than it's up to you to find a way of cuting it into filenames. Be aware that "somename.txt.exe.pdf" is just one file...
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As far as I can understand this,You have a file with some file name's stored in it.SO you want to move to the next record(filename) in your file when user takes /performs some action and show the text/name of the file. Am I right?
If yes, you can go ahead with this method :
1) Open the file.
2) Read the first element. (eg. Do this in while loop)
3) Prompt the user if he want to see the next name.
4) A)yes . show the next entry in the file
B)No . Break out of the loop.
You can use fread for reading the elements in the file.
Somethings seem HARD to do, until we know how to do them.
_AnShUmAn_
-- modified at 6:53 Friday 23rd June, 2006
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kamalesh82 wrote: how can I iterate file pointer within a file consisting list of file.
That really depends on how you are reading the file. Any read operation on a file will advance the file pointer automatically. You can also do it programmatically via fseek(), SetFilePointer(), or CFile::Seek().
kamalesh82 wrote: that is, when ever it iterates i get next list file using vc++(mfc)
Are you using the CFileFind?
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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I htink that you mean that you have a text file, containing file names, each file name on a line of text and you want to iterate throug it.
If that is true, you have to read the file one char at a time and stop when you get to the combination CRLF (0x0d 0x0a).This is an line end.
If your text file is written in UNICODE be aware that 1 unicode char has 16 bits(2 bytes).The "normal" one has 8 bits(1 byte).
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I just read in the file into a CString object and tokenize to the new line character using a while loop.
i.e. filename = fileContent.Tokenize("\n",iStart);
hope this helps.
Ferdinad
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noob here so be gentle...
How difficult is it to add Unicode support for an existing application? Can anyone point me to some tutorials/docs on this matter? I need to do this for a project that was desinged a few years back and i really do not want to go into the code..
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The firt thing to do would be to add the following two directives to the top of the project's stdafx.h file:
#define UNICODE
#define _UNICODE Now compile the project and you'll see what statements need to be changed.
"The largest fire starts but with the smallest spark." - David Crow
"Judge not by the eye but by the heart." - Native American Proverb
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Unicode means using "wide chars".So any code using char* will need to be checked&MODIFIED .You should particulary pay attention to the places where you pass the size of the string in bytes since
strlen(string)is the good size (in bytes) for non unicode but not for unicode.
Basically you should(VC6.0):
1)Add an "Unicode Debug" and an "Unicode Release" configuration (Build/configurations)
2)define UNICODE and _UNICODE in the *project settings* AND REMOVE the define _MBCS for the defined configurations.Also Change the entrypoint(Tab"Link",Category:"output")from empty to "wWinMainCRTStartup"(if you are using MFC)
3)Surround any text in code with _T() like : _T("text here")
4)Search in MSDN "Routine Mappings" to find out what string functions you should replace and with what(Ex:_tcslen instead of strlen)and relace them.Replace any "char" with "TCHAR" if it is used for strings.
5)Change the font for all dialogs to one that supports Unicode (Like Arial,Tahoma)
6)Pray to god you haven't missed something,Compile,Fail to link,notice that you have dependencies that are not unicode and start all over again.
Sorry for the bad news.
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 Actually, i've posted this question after going trough steps 1 to 6 (minus the start all over again part) and I was hoping for an easyer aproach.
So basically i'm up to my ears into a summer of search and replace plus one month of serious debugging. I hate programmers that don't use unicode by default for their applications(myself included )
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Hi,
I want to insert a HBitmap object in the CRichEditCtrl. For this purpose I am using the CImageDataObject class (defined by the following open-source project)
http://www.codeguru.com/cpp/controls/richedit/article.php/c5383/[^]
My problem is that it works fine if I use the bitmaps which are loaded from resources. but gives a Memory exception if I create my own bitmap.
My bitmap creation function is given as follows
HBITMAP MyImage::MakeBitmap2()
{
if (!pDib)
return NULL;
HBITMAP handle = NULL;
HDC dc = ::CreateCompatibleDC(NULL);
if (dc)
{
// tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
// is a memory dc that must have a handle selected into it)
BITMAPINFO bi;
ZeroMemory(&bi, sizeof bi);
bi.bmiHeader.biSize = sizeof (BITMAPINFOHEADER);
bi.bmiHeader.biWidth = GetWidth();
bi.bmiHeader.biHeight = GetHeight();
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 24;
VOID* pvBits;
handle =CreateDIBSection(dc, &bi, DIB_RGB_COLORS, &pvBits, NULL, 0);
if (handle==NULL)
{
return NULL;
}
HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, handle);
StretchDIBits(dc, 0, 0, head.biWidth, head.biHeight, 0, 0, head.biWidth, head.biHeight,
info.pImage,(BITMAPINFO*)pDib, DIB_RGB_COLORS,SRCCOPY);
::SelectPalette(dc, NULL, TRUE);
::SelectObject(dc, oldBitmap);
::DeleteDC(dc);
}
return handle;
}
I am already using this function for doing some other image related tasks and it is working fine,
So can any body tell me why isn't it working with that object.
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In my program, I have installed a WH_CBT hook on a filter function. I want to monitor window creation event.
Problem is I am getting more than 1 notifications when a single window is created.
Example when a dialog box was created I was getting more than 1 notification (in range 3-10)
I wanted only a single notification.
waiting for reply
Thanks
-- modified at 7:19 Friday 23rd June, 2006
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define a BOOL variable
BOOL windowCreated = FALSE;
then in your windows procedure.
if(windowCreated==FALSE)
{
msgbox..
windowCreated=TRUE;
}
Row
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Assume i have a base class A (which contains a virtual function "test") and its derived class B (implement the virtual function).
Now i do :-
A* a = new A;
memset( a, 0, sizeof( A ) );
a->test(); // here it crashes??
Why?
Thanks...
Heaven is a girl I know so well
She makes me feel good when I feel like hell
Heaven is a girl that I've got to have
And she makes me feel better when I'm feelin' bad
Heaven is a girl that makes dreams come true
Oh, no one does it good like heaven do, yeah
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I'm not totally sure but I think the reason is because once you have a virtual function in your class, you will have a virtual function table added in the class. That is, a table that will redirect the call to a function to the specific function (base or inherit) in function of the type of the object. So, if you 'erase' this table with 0, if you try to call a function within this table, you will try to call a function at memory location 0, which causes a crash.
Cédric Moonen
Software developer
Charting control
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You are correct. This is a classic example of what goes wrong when you mix low level constructs with high level ones without a well developed understanding of how the high-level constructs are implemented. Every class that has virtual functions has a virtual function table; one table is shared between all instances of that class. It contains pointers to virtual functions (or sometimes adjustor thunks to the virtual functions if multiple inheritance is used). When the constructor of a class with virtual functions is called it initializes a pointer in the instance data to point to the class’s vtable: this is the pointer that's being overwritten. In short, if you use simple structs and classes (no virtual functions or multiple inheritance) the layout of the class is what you would naively expect; if you have a struct or class with high-level constructs such as virtual functions or multiple inheritance the layout of the class as a whole will not be so predictable and will contain the book keeping info needed to implement them.
Steve
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Just to be more precise: the v-table is not in the object itself, but somewhere in the system.
Its leading address is in the object, and part of the object size, as the virtual base table address (if any).
What is erased is not that table itself, but the table address, hence, by invoking a virtual function, you'll try to find the address by seeking the corresponding entry considering the memory "0" to be the table.
The crash is not the function invoke, but the attempt to read an invalid memory page to detect wich function to invoke.
2 bugs found.
> recompile ...
65534 bugs found.
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I think main idea behind virtual functions is they r there only so that derived classes could make use of it.
If u had written
A* a = new B ;
ur code would have worked fine.
I have not refreshed c++ from last 8 months if I am wrong anybody cancorrect me
bye.
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I posted before his reply. anyway i will make use of information
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u r almost right, I was in my own world
to be honest I had written my suggestion when nobody had presented reply to the original question, but I failed to press submit.
If I was totally wrong I would not have replied.
why waste our time unnecessarily on useless point.
bye(this time really)
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Sometimes when you start a reply you're the first but you take some time to write it and by the time you send it it's out of date; it has happened to me before today.
Steve
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