C / C++ / MFC

Smith#31-Mar-11 6:22

Smith#

31-Mar-11 6:22

whereas strcat NEEDS a string (empty or otherwise) to append to.

so I'll have to memset everything to 0 or initialize everything to 0 right?

Waldermort31-Mar-11 6:35

Waldermort

31-Mar-11 6:35

No. When dealing with string buffers you only need to set the first char/wchar/tchar to 0.

char myString[100]; // Is a buffer of 100 chars the a string may be copied into.<br />
strcat( myString, "Hello World!" ); // will fail because the buffer is full of junk.<br />
// but<br />
strcpy( myString, "World!" ); // will work because it doesn't care what is in the buffer<br />
myString[0] = 0; // copies an empty string to the buffer<br />
strcat( myString, "Hello World!" ); // appends the string to the empty string ( also sets the character after '!' to \0 or NULL.

The new string is actually 13 chars because there is a 0 at the end.

On another note. You shouldn't be using those string functions. There are safer versions available:
strcpy_s( myString, 100, "Hello World!" );
These check to make sure the buffer is large enough for the string

Also, you might want to read up on TCHAR and the unicode/ansi string functions

TCHAR myString[100];<br />
_tcscpy_s( myString, 100, _T("Hello World!");

Waldermort

Luc Pattyn31-Mar-11 7:18

Luc Pattyn

31-Mar-11 7:18

CPallini wrote:
The code ... is correct.

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

CPallini31-Mar-11 7:36

CPallini

31-Mar-11 7:36

It isn't wrong. It isn't elegant nor optimal, but not wrong. I think this is a great achievement, after all.
(It's a subliminal suggestion for you: could you please hire the OP?)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Luc Pattyn31-Mar-11 7:39

Luc Pattyn

31-Mar-11 7:39

CPallini wrote:
It isn't elegant

true.

CPallini wrote:
nor optimal

true.

CPallini wrote:
not wrong

false. see my reply to OP.

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum

Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.

Re: Compare And Set 64 bit

CPallini31-Mar-11 8:02

CPallini

31-Mar-11 8:02

See my reply[^].
Smile | :)

Compare And Set 64 bit

Waldermort31-Mar-11 1:40

Waldermort

31-Mar-11 1:40

On most 32 bit systems bit 1 and 2 are not used in an address. This allows the CAS algorithm to test an address and also test a flag (very useful for non blocking linked lists).

However on a 64 bit system those 2 bit are in use.

After doing some googling I have found that AMD64 and IA64 use 48 bits. AMD plans to extend that 52 bits.

So my question is, Am I safe to use bit 1 of a 64 bit address, if so will it be portable?

Waldermort

Klaus-Werner Konrad31-Mar-11 9:06

Klaus-Werner Konrad

31-Mar-11 9:06

What exactly do you want to ask ?
Is it processor architecture ?
Is it C, or C++, or C# ?
Is it Win32 / Win64 ?
Is it about pointers ?

If you (in C/C++/C#) have a BYTE array, then ALL lower bits of an address WILL be used; ohterwise you wouldn't be able to do a bulk read or write from a binary file.
Of course, if you do so, you will earn a lot of additional CPU cycles due to misalignment of addresses to WORD / DWORD boundaries, but as cores are so fast now, it doesn't really matters

Need help on windows socket programming

John50231-Mar-11 0:30

John502

31-Mar-11 0:30

Hi,
I need information on socket programming and need to develop an application which communicates with each other as server socket and client socket..

Can any one help me out regarding this...?

Thanks
John.

Re: Need help on windows socket programming

Nelek31-Mar-11 0:33

Nelek

31-Mar-11 0:33

Google[^] is your friend and has a lot of information. And this[^] is a good lecture as well Smile | :)

Regards.
--------
M.D.V. Wink | ;)

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpfull answers is nice, but saying thanks can be even nicer.

Re: Need help on windows socket programming

Dave Calkins31-Mar-11 6:28

Dave Calkins

31-Mar-11 6:28

Take a look at the below.

Push Framework - A C++ toolkit for high performance server development in Windows[^]

VC 6 bug?

includeh1030-Mar-11 16:01

includeh10

30-Mar-11 16:01

I use VC 6.
Some classes can not be viewed on Class-View, but header files of those invisible classes are all added to project, which can be found on File-View.

If I slightly modify header files of those invisible classes, they appear on Class-View.
If I reopen the project, those classes are still invisible on Class-View.

How to fix the bug?

Albert Holguin30-Mar-11 17:10

Albert Holguin

30-Mar-11 17:10

not exactly sure what would cause this specifically, but sometimes you get weird behavior if you don't include files properly and/or don't properly use header guards

_Flaviu30-Mar-11 21:17

_Flaviu

30-Mar-11 21:17

I had this problem too , and I solve it in that way : I edit something in header files ( of class who is hidden in Class View ) , then Ctrl + S and they will show up in Class View .

Hans Dietrich30-Mar-11 22:20

Hans Dietrich

30-Mar-11 22:20

Delete your .ncb file (or rename it) - VS6 will re-create it.

Best wishes,
Hans

[Hans Dietrich Software]

CPallini30-Mar-11 22:29

CPallini

30-Mar-11 22:29

If I remember well, deleting the .clw file makes the trick: the IDE builds a new, correct one (anyway, before trying, please do a backup of the original .clw file).
Smile | :)

Nyil31-Mar-11 1:34

Nyil

31-Mar-11 1:34

Close the workspace and Delete *.clw and *.ncb files from your workspace.
After open the project select the classwizard. now it will say class file does not exist and you can select all your *.cpp and *.h files from the list and recreate the clw file.

invisible the file or folder

Smith#31-Mar-11 5:12

Smith#

31-Mar-11 5:12

Delete VC6 and move on to VC10 everything would be alright.

sarfaraznawaz30-Mar-11 5:15

sarfaraznawaz

30-Mar-11 5:15

hi
i doing project on the hiding the folder in windows OS that should not be visible when click the check show hidden .....
i mean making the folder totally invisible like the folder lock 6.5 will hide ...
i am not getting the idea how they had done ...
help me out from this
thanking you....

Code-o-mat30-Mar-11 5:57

Code-o-mat

30-Mar-11 5:57

Don't know Folder Lock (any version), but have a look at File System Filder Drivers[^] and File System Filter Driver Tutorial[^], maybe those are pointing at the right direction.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> //TODO: Implement signature here<

image processing toolkits | batch image processing

C^hris L^osinger30-Mar-11 7:07

C^hris L^osinger

30-Mar-11 7:07

nobody wants an invisible folder on their machine.

Niklas L30-Mar-11 12:13

Niklas L

30-Mar-11 12:13

Did you consider storing the backlog in one? Smile | :)

home

sarfaraznawaz30-Mar-11 18:58

sarfaraznawaz

30-Mar-11 18:58

sorry i did't got it ...

are you asking about the memory map then i stopped doing on that up to reading a single file not for the whole drive ...

now to do the project to hide the file or folder from the user ......
i tried using the CSLID but it just convert the recycle bin icon and many other icon such control panel,N/W like icon and also tried with setting the attrribute of the file and making it to system file.....