C / C++ / MFC

Re: Any Method to check if database provider is installed on a machine

26-Jan-08 0:12

What about trying to connect?

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.

[my articles]

David Crow26-Jan-08 12:07

After Selecting Activex Control the Application crashes...

26-Jan-08 12:07

Does this help?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

spalanivel25-Jan-08 18:49

spalanivel

25-Jan-08 18:49

Hi All,
If I run the Activex Control Test Container Application to test the activex control, the Test Container application either crashes or dumps an "unspeifified error" as "Microsoft Development Environment has encounters a problem and need to close".
Help me to fix the error!

ini file creation in windows mobile

guru moorthy.k25-Jan-08 18:48

guru moorthy.k

25-Jan-08 18:48

hi

i have a application in windows mobile that is to create a ini file.

in nthe same ini file i must write data and read the data

k.guru moorthy

Re: ini file creation in windows mobile

Maxwell Chen25-Jan-08 21:55

Maxwell Chen

25-Jan-08 21:55

Maybe ask your question at Mobile development[^] forum ...

Maxwell Chen

Access Violation at ii=ii+1; all other variables print value correctly

mrby12325-Jan-08 13:10

Re: Access Violation at ii=ii+1; all other variables print value correctly

25-Jan-08 13:10

// select suitable seedwave file for the deck
CString file_now;
s_dis=0;
int ii=0;
file_now=ftitle[0];
s_dis=sd_dis[0];
//
do {
file_now=ftitle[ii];
s_dis=sd_dis[ii];
//
ii =ii+1;
//
} while (ii<nfile && sd_dis[ii]<dis);
//

I debudg my program I got "Access Violation" at ii=ii+1; all other variables print value correctly. I really do not know what is the problem ?

Thanks for the help

David Crow25-Jan-08 17:13

Re: Access Violation at ii=ii+1; all other variables print value correctly [modified]

25-Jan-08 17:13

mrby123 wrote:
I debudg my program I got "Access Violation" at ii=ii+1;

What is the value of ii at this point?

mrby12325-Jan-08 20:37

Re: Access Violation at ii=ii+1; all other variables print value correctly

25-Jan-08 20:37

at this point ii=0. However, if the statement would exicute, ii should be 1.
However, access violation occured when the statement was tried to exicute.
You can see I initialized ii before the block.

Thanks

modified on Saturday, January 26, 2008 2:54:41 AM

CPallini25-Jan-08 21:44

Re: Access Violation at ii=ii+1; all other variables print value correctly

25-Jan-08 21:44

I think you should post also array declarations.
Smile | :)

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.

[my articles]

mrby12326-Jan-08 7:18

Re: Access Violation at ii=ii+1; all other variables print value correctly

26-Jan-08 7:18

Thanks for your response.

Here is the array declarations:

float sd_dis[20];
CString ftitle[20];
//
CString file_now;
s_dis=0;
int ii;
ii=0;
do {
file_now=ftitle[ii];
s_dis=sd_dis[ii];
ii =ii+1;
} while (ii<nfile && sd_dis[ii]<dis);
//

CPallini26-Jan-08 22:51

Re: Access Violation at ii=ii+1; all other variables print value correctly

26-Jan-08 22:51

Well, of course ii=ii+1; cannot give such an exception, you have to check, using the debugger, for out-of-boundary array access, i.e. if ii happen to be 20 or more in code containing sd_dis[ii] or ftitle[ii].

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.

[my articles]

mrby12327-Jan-08 14:01

Re: Access Violation at ii=ii+1; all other variables print value correctly

27-Jan-08 14:01

Thanks for the comments:

I can not find anything like "if ii happen to be 20 or more in code containing sd_dis[ii] or ftitle[ii].". At ii=ii+1 the error pointed in the debudg at the following statement:

->> 00433872 mov dword ptr [ecx],edx

Thanks for the help

CPallini27-Jan-08 22:18

strcpy_s vs strncpy_s (VC 2005 Secure API's)

27-Jan-08 22:18

Could please post the whole error message (and the whole code snippet)?
What is the ii value when the exception occurs?
BTW the assembly instruction reported doesn't appear to be an integer increment operation: it seems more an array access.
Smile | :)

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.

[my articles]

Peter Weyzen25-Jan-08 11:10

Peter Weyzen

25-Jan-08 11:10

We used to use strncpy to protect the buffer when copying into it. Does strcpy_s totally take that over?

I know when I debug, that sometimes I get a runtime error inside strcpy_s when the source string is longer than the buffer.

Will this runtime error appear in a non-debug build?

And should I really be using strncpy_s() instead of strcpy_s()?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

Re: strcpy_s vs strncpy_s (VC 2005 Secure API's)

David Crow25-Jan-08 17:17

Re: strcpy_s vs strncpy_s (VC 2005 Secure API's)

25-Jan-08 17:17

Peter Weyzen wrote:
And should I really be using strncpy_s() instead of strcpy_s()?

Only if you need to tell the function how many characters to copy.

Peter Weyzen25-Jan-08 20:04

Peter Weyzen

25-Jan-08 20:04

I guess it was the exception inside strcpy_s that got me.

I hope that's debug only....

What's your opinion of the _s funtions? They seem long overdue...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br />
Peter Weyzen<br />
Staff Engineer<br />
<a href="http://www.soonr.com">SoonR Inc -- PC Power delivered to your phone</a>

Re: strcpy_s vs strncpy_s (VC 2005 Secure API's)

Nemanja Trifunovic26-Jan-08 8:25

Nemanja Trifunovic

26-Jan-08 8:25

Peter Weyzen wrote:
What's your opinion of the _s funtions? They seem long overdue...

Non-portable, slow and also not very secure either.

Programming Blog

utf8-cpp

Finding an SMTP server

hxhl9525-Jan-08 11:02

25-Jan-08 11:02

Hi all,

I've see apps before where you click a button and it shows you a listbox with local SMTP server(s). How exactly is this done? I've done some research into querying MX records, and also the DnsQuery function in Windows, but they don't help at all.

Can anyone give me some pointers?

Thanks in advance. Smile | :)

David Crow25-Jan-08 17:21

25-Jan-08 17:21

hxhl95 wrote:
How exactly is this done?

DnsQuery() is but one way.

PDNS_RECORD pRec = NULL;
DnsQuery(lpszHostDomain, DNS_TYPE_MX, DNS_QUERY_STANDARD, NULL, &pRec, NULL);

hxhl9525-Jan-08 19:42

25-Jan-08 19:42

How would I find the host domain though?

David Crow26-Jan-08 12:06

Re: Finding an SMTP server [modified]

26-Jan-08 12:06

Can't you use whatever domain you are sending the e-mail to?

hxhl9526-Jan-08 16:39

26-Jan-08 16:39

I could, but I've seen apps where they get the local domain...I'm just curious. I mean, of course it would work to get the domain of the recipient's email(s), but I'd like to know how you get the local domain name.

And...to use DnsQuery you have to include WinDNS.h and add dnsapi.lib to your library files, right? I've added dnsapi.lib in, but my VC++ 6.0 compiler tells me that it can't find the file. Why? (I've installed the SDK already)

modified on Saturday, January 26, 2008 11:21:58 PM

David Crow27-Jan-08 8:39

27-Jan-08 8:39

hxhl95 wrote:
...but my VC++ 6.0 compiler tells me that it can't find the file. Why?

Is your SDK's Include folder known by the IDE (it's not by default)? If you use an absolute path with dnsapi.lib, does that satisfy the linker?

hxhl9527-Jan-08 10:45