C / C++ / MFC

7-May-02 9:41

Excuse my being too ironic. You don't have to apologize for anything at all, this is a free forum Smile | :)

Regards.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Deleting a file

Carlos Antollini7-May-02 10:10

Carlos Antollini

7-May-02 10:10

Joaquin, you are very hard with that Guy...

He only wants to knows how to use the DeleteFile function...

if(DeleteFile("C:\\MyPath\\File.tmp"))
  AfxMessageBox("The file was deleted...");

Best Regards

Carlos Antollini.
www.wanakostudios.com
Sonork ID 100.10529 cantollini

Wrap text?

7-May-02 7:55

Hello

I want to put a paragraph of text into a char buffer, but I am not allowed to wrap the text onto a new line. Does anyone know how I can over come this

char buf[2000] = "text text text text text
text text text text text
text text text text text text text";

error C2001: newline in constant
error C2146: syntax error : missing ';' before identifier 'text'
error C2065: 'text' : undeclared identifier
error C2146: syntax error : missing ';' before identifier 'text'
...

Re: Wrap text?

Joaquín M López Muñoz7-May-02 8:04

Accessing structs in other classes

7-May-02 8:04

char buf[2000] = "text text text text text "
"text text text text text "
"text text text text text text text";

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Wrap text?

Navin7-May-02 8:18

Navin

7-May-02 8:18

You should be able to do this:

char buf[2000] = "text text text text\
text text text text\
text text text";

No generalization is 100% true.
Not even this one.

Re: Wrap text?

Shog⁹7-May-02 12:06

Shog⁹

7-May-02 12:06

If all you want to do is wrap your source file to keep everything nice and tidy, the answer has already been posted.

If you want to embed line breaks in your text, just replace each newline with the character sequence '\n', as in:

char buf[2000] = "text text text text text \n"
"text text text text text \n"
"text text text text text text text";

--------
I don't think that I'm a sell-out but I do "Enjoy Coke!"...

-- Bloodhound Gang, The Inevitable Return Of The Great White Dope

Steve L.7-May-02 7:54

7-May-02 7:54

In my Doc I have this:

struct ItemInfo
{
	CString name;
	CString catagory;
	CString description;
}itemInfo;

Then in my View I have this:

//get a pointer to the doc
CMyDoc* pDoc = GetDocument();
<br>
//get the item name
CString itemName = GetItemName();
<br>
//put the item name in the doc struct
pDoc->itemInfo.name = itemName;

But the program aborts when it reaches the last line of code, why?

-Raffi

Joaquín M López Muñoz7-May-02 8:14

7-May-02 8:14

Excuse me if I'm pointing the obvious, but have you checked that pDoc is !=NULL? Apart from this, the way you're accessing itemInfo seems OK to me.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moliate7-May-02 8:24

moliate

7-May-02 8:24

Did you accidently put the struct definition outside the public scope?

/moliate

Two o'clock and walking through familiar London - Or what was familiar London before the cursor deleted certain certainties -
I watch a suit and tie man giving suck to the Psion Organizer lodged in his breast pocket
its serial interface like a cool mouth hunting his chest for sustenance, familiar feeling, and I'm watching my breath steam in the air.

Neil Gaiman - Cold Colours

Steve L.7-May-02 8:39

7-May-02 8:39

pDoc != NULL and the struct is public. Anyother possible problems?

-Raffi

Joaquín M López Muñoz7-May-02 8:52

7-May-02 8:52

Stop just before the offending line and inspect the contents of pDoc. Does it look OK (reasonable data)?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Steve L.7-May-02 9:00

7-May-02 9:00

How do I see the contents of pDoc?

-Raffi

Joaquín M López Muñoz7-May-02 9:10

7-May-02 9:10

Insert a breakpoint at the offending line (F9), run the program, wait till it stops at your breakpoint, press SHIFT+F9 (I think) and type pDoc in the window that appears.
If you need more help about using the debuger, have a look at the documentation that comes with your VC++ --it shouldn't be hard to locate the section on debugging.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Steve L.7-May-02 9:19

7-May-02 9:19

It says pDoc is 0x00781ca0. Dose that look "OK"?

-Raffi

Joaquín M López Muñoz7-May-02 9:21

7-May-02 9:21

Man, use your brain. Inspect the contents of pDoc.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Detecting Internet access

tongc7-May-02 14:11

tongc

7-May-02 14:11

[quote]It says pDoc is 0x00781ca0. Dose that look "OK"? [/quote]

this is the memory location only!

Neil scsn7-May-02 7:38

Neil scsn

7-May-02 7:38

Hi,
Im doing a small program in which I want to detect if the internet is being accessed by the user.

I have searched for this but with no luck Cry | :((

Re: Detecting Internet access

Ravi Bhavnani7-May-02 7:43

Ravi Bhavnani

7-May-02 7:43

This article shows how to check if you're connected to the internet.

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Problem with opening file... please read.

redeemer7-May-02 7:31

redeemer

7-May-02 7:31

OK. I'm trying to open a file and red the last 128 bytes in it, but if it's the first time i read the file since the computer has been started, it only reads the first three chars. It's strange cause when i then open it right after i have opened it the first time, it works. here's the code:

int GetID3(char *szFile)
{
	HANDLE hFile;
	DWORD dwBytesRead;
	DWORD dwFileSize;
	OVERLAPPED FilePos;
	OVERLAPPED *pFilePos = &FilePos;

	hFile = CreateFile (szFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL);
	dwFileSize = GetFileSize(hFile, NULL);

	pFilePos->Offset = dwFileSize - 128;
	pFilePos->OffsetHigh = 0;
	pFilePos->hEvent = 0;

	gszID3Tag[0] = '\0';

	ReadFile(hFile, gszID3Tag, 128, &dwBytesRead, pFilePos);

	gszID3Tag[128] = '\0';

	if (dwBytesRead != 128)
		return 0;
	else
		return 1;
}

Can anyone help me?

Thankyou.

Joaquín M López Muñoz7-May-02 8:03

7-May-02 8:03

Since you're reading the file in overlapped mode, it is perfectly possible that the reading operation has not completed when ReadFile returns. Try inserting a Sleep(1000) right after ReadFile (of course this is not the way to fix the problem, but it can help you to determine its cause.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Paul M Watt7-May-02 8:05

Paul M Watt

7-May-02 8:05

Is there any particular reason why you are using overlapped IO? With the simple function that you have posted, it does not seem to be necessary. Also you should be calling CloseHandle on hFile when you are done with the file handle, this function is leaving the file open.

With overlapped IO, the ReadFile function becomes asynchronous and the function may not be done reading the file when you move on to the next statements in your function rather than in normal mode the function does not continue until all of the data that you requested has been read from the file. If the function is not yet done it will return a ERROR_IO_PENDING value indicating that it is not yet done.

Since your file is left open, the data is probaly stored in the file cache and the next time you go to read from that file, it automatically has the data to place into your buffer and that is why it is available.

My suggestion, if you can avoid the overlapped IO, I would do it.

Good Luck!

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

redeemer7-May-02 8:45

redeemer

7-May-02 8:45

The reason iøm using the overlapped structure, is because i can specify a file offset, 128 bytes from the end of the file, is there another way to do this?

Joaquín M López Muñoz7-May-02 8:54

7-May-02 8:54

<a href="http://msdn.microsoft.com/library/en-us/fileio/filesio_8iwi.asp">SetFilePointer</a>.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo