C / C++ / MFC

Re: Deriving a class from CColorDialog

1-Jun-06 2:39

if he only want to do set color he can do it by defining a simple brush at OnCtlColor function. Why should we take unwanted services for our application.

I think he want to set back color for his dialog. actually the CColorDialog is used fo rcolor choosing purpose naaa? I think we can use it services to get teh color selected. no need to derive a new class.

im not sure whether me and he is talking about same problem Frown | :(

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Hamid_RT1-Jun-06 2:47

Hamid_RT

1-Jun-06 2:47

he said (I want to derive a class from CColorDialog) and then change text

whitesky

Property Page and Sheets

si_691-Jun-06 1:34

si_69

1-Jun-06 1:34

Hi all

I am working on an app that creates a wizard via the CPropertySheet.

I need to change the displayed pages depending on the answers to questions along the way.

I thought if i called OnWizardNext, and return the dailog identifier

it would work

LRESULT CMyPage2::OnWizardNext()
{
return IDD_PPAGE5;
}

but it doesnt, anyone any ideas ?
si

Re: Property Page and Sheets

_anil_1-Jun-06 1:47

_anil_

1-Jun-06 1:47

You are right and I don't find any problem in your code Frown | :-(

Just check if you had add the page corresponding to IDD_PPAGE5 before the property sheet is created.

Regards
Anil

module could not be found

Sarath C1-Jun-06 1:32

1-Jun-06 1:32

when im trying to register a OCX im getting following error
"The specified module could not be found".
what may be the reason?

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

ThatsAlok1-Jun-06 1:56

ThatsAlok

1-Jun-06 1:56

SaRath C wrote:

when im trying to register a OCX im getting following error
"The specified module could not be found".

The Module used by OCX is not found at the time of registering, mainly it is libaray file!

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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VC Forum Q&A :- I/ IV
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Sarath C1-Jun-06 2:05

1-Jun-06 2:05

thanks for the reply. here net has some problems so I could not see ur answer. it could have save my time Frown | :(

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

Sarath C1-Jun-06 2:04

1-Jun-06 2:04

The Issue has resolved. the OCX was using another DLL and was in not in the current path or system32.

Sa^Rath.

"Don't Do Different things... Do Things Differently..."

How to copy string with NULL

NiceNaidu1-Jun-06 2:14

NiceNaidu

1-Jun-06 2:14

This occurs when an ActiveX control is
not registered, or a dependent dll cannot be found.

Appu..
"If you judge people, you have no time to love them."

<color>Aljechin 1-Jun-06 1:03

1-Jun-06 1:03

Hi all,

I need to copy a string which may contain NULL characters in between. I may run a loop but I just wanted to know if there is any other way to do this. Normal function like strcpy and all will stop reading after it encounters a NULL since it assumes end of string when it reads NULL.

NOTE: I am using plain C.

Rose | [Rose]

Nibu babu thomas1-Jun-06 1:08

Nibu babu thomas

1-Jun-06 1:08

Aljechin wrote:
NOTE: I am using plain C.

strncpy or memcpy should help.

Nibu thomas
A Developer

Programming tips[^] My site[^]

Cedric Moonen1-Jun-06 1:15

Cedric Moonen

1-Jun-06 1:15

strncpy will not work:

The strncpy function copies the initial count characters of strSource to strDest and returns strDest. If count is less than or equal to the length of strSource, a null character is not appended automatically to the copied string. If count is greater than the length of strSource, the destination string is padded with null characters up to length count.

Cédric Moonen
Software developer

Charting control

Nibu babu thomas1-Jun-06 1:17

Nibu babu thomas

1-Jun-06 1:17

Cedric Moonen wrote:
strncpy will not work:

Yeah it won't. Was just a blind hit. Was not sure about it. Read the docs now. Sorry for that. Smile | :)

Nibu thomas
A Developer

Programming tips[^] My site[^]

<color>Aljechin 1-Jun-06 1:43

1-Jun-06 1:43

<br />
char szSource[23] = {"Before\0After"};<br />
char szDest[23];<br />
<br />
ptr = memcpy(szDest,szSource,22);<br />
printf("%s %d",szDest,strlen(szDest));<br />

Hi, may i please request you to just try this code and comment on why memcpy is failing? Is it the way it goes or am I wrong somewhere? Can you suggest some workaround? Thanks for your time.

Rose | [Rose]

Nibu babu thomas1-Jun-06 1:52

Nibu babu thomas

1-Jun-06 1:52

Aljechin wrote:
Hi, may i please request you to just try this code and comment on why memcpy is failing? Is it the way it goes or am I wrong somewhere? Can you suggest some workaround? Thanks for your time.

Sure! Please look up memcpy in MSDN. There is a working demo there.

See you were saying that szSource contains NULL characters right? So strlen won't work because it will return when it finds the first null character. Same with printf and other functions. They all return when the first NULL character is found. So if your string is...

"Nibu\0is a\0\0\0good\0boy\0".

strlen will return 4. printf will print only Nibu

Nibu thomas
A Developer

Programming tips[^] My site[^]

<color>Aljechin 1-Jun-06 1:59

1-Jun-06 1:59

Thank you so much. I will surely check that example and get back to you with the problem status.

peace homie Rose | [Rose]

David Crow1-Jun-06 3:30

David Crow

1-Jun-06 3:30

Aljechin wrote:
ptr = memcpy(szDest,szSource,22);

Use 12 instead.

Aljechin wrote:
printf("%s %d",szDest,strlen(szDest));

This is highly dependent on szDest being nul-terminated. Using memcpy() implies that you are not treating it as a nul-terminated string.

"The largest fire starts but with the smallest spark." - David Crow

<color>Aljechin 1-Jun-06 20:38

1-Jun-06 20:38

Thank you so much.

Rose | [Rose]

Nemanja Trifunovic1-Jun-06 1:35

Nemanja Trifunovic

1-Jun-06 1:35

Aljechin wrote:
I need to copy a string which may contain NULL characters in between

How about std::copy[^]?

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

<color>Aljechin 1-Jun-06 1:47

1-Jun-06 1:47

char szSource[23] = {"Before\0After"};<br />
char szDest[23];<br />
<br />
ptr = memcpy(szDest,szSource,22);<br />
printf("%s %d",szDest,strlen(szDest));

I went through that page, but not getting it. Can you show me a small code snippet of how do i copy that szSource into szDest? Sorry if a very elementary question.

Rose | [Rose]

Cedric Moonen1-Jun-06 1:58

Cedric Moonen

1-Jun-06 1:58

What are you trying to do exactly ?
Is not because memcpy sucessfully copied the source into the destination that the '\0' character will be removed. It will still be present in the new string so as soon as you try to get its length or print the string, you will only have the begining of the string. This is totally logical.

Cédric Moonen
Software developer

Charting control

<color>Aljechin 1-Jun-06 2:05

1-Jun-06 2:05

What I am doing? PIP (Peripheral Interface Programming). I have generated a sequence of binary data which will be understood by a peripheral device. For example, we issue a print command from notepad. Its not the .txt file that is sent to the printer by the OS. But a series of printer-understood data is sent. My program generates such device-understandable data which could be just dumped into the port of the device and it will print some meaningful text or act accordingly. I have this binary (kinda junk) stored in unsigned char array. So, I am trying to figure out a way to do this. Smile | :)