Re: Help DLL - C / C++ / MFC Discussion Boards

Re: String Combination

Rajesh R Subramanian5-Apr-11 5:48

Rajesh R Subramanian

5-Apr-11 5:48

Haha. That makes sense. Smile | :)

"Real men drive manual transmission" - Rajesh.

Re: String Combination

john56325-Apr-11 0:38

john5632

5-Apr-11 0:38

not permutation, I need to search the string of particuler length, It can be any combination from a to z. How to do that?

Re: String Combination

Rajesh R Subramanian5-Apr-11 0:57

Rajesh R Subramanian

5-Apr-11 0:57

john5632 wrote:
not permutation, I need to search the string of particuler length, It can be any combination from a to z. How to do that?

So, you need to search a string? Is that some sort of a c++ string object, or a character array, or do you have to implement a search, etc., What exactly do you need?!

Please read this post[^] and include all relevant information so that someone can answer your question. It's ambiguous, and confusing right now.

"Real men drive manual transmission" - Rajesh.

Re: String Combination

David Crow5-Apr-11 3:04

David Crow

5-Apr-11 3:04

john5632 wrote:
I need to search the string of particuler length...

That's a vastly different request than you initially posted. What exactly are you looking for? Be specific. Provide examples. Show pseudo code. What have you tried so far? Have you taken preliminary steps and worked this out on paper first (if not, how can you possibly expect the computer to know any different)?

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Re: String Combination

Hans Dietrich5-Apr-11 1:59

Hans Dietrich

5-Apr-11 1:59

It sounds like you've got the same homework as this guy: http://www.codeproject.com/Questions/177079/Strings-All-combinations-based-on-a-given-length.aspx[^]

Best wishes,
Hans

[Hans Dietrich Software]

Re: String Combination

CPallini5-Apr-11 2:16

CPallini

5-Apr-11 2:16

Just count, in base-26, from aaaaa to zzzzz (11881376 items in base-10, if I got you).
Smile | :)

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Help DLL

so0_lanhlung24-Apr-11 17:07

so0_lanhlung2

4-Apr-11 17:07

i have checkbox...

i want when i check my checkbox,my DLL know that i checked

someone have solution?

thanks so much

Re: Help DLL

«_Superman_»4-Apr-11 19:21

«_Superman_»

4-Apr-11 19:21

The checkbox checked notification is sent to the parent dialog of the checkbox.
You will need to call some method in the DLL when you get this check event.
The event is BN_CLICKED.

«_Superman_»
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Polymorphism in C

Re: Help DLL

so0_lanhlung25-Apr-11 22:50

so0_lanhlung2

5-Apr-11 22:50

i understand your idea but i don't know how make it..
can you write a sample ( function GetEvent) for me?
or any document to understand it...
thanks Hans Smile | :)

Re: Help DLL

CPallini4-Apr-11 21:51

CPallini

4-Apr-11 21:51

I elaborate just a bit the good Superman's answer.
The CheckBox 'check' is a GUI event and should be handled by the GUI code (as Superman already suggested, you typically handle the BN_CLICKED notification code of the WM_COMMAND message in the parent window of the CheckBox control).
The best way to 'notify something' to a DLL is calling a DLL's function. So:

Define a DLL function, e.g. OnMyCheck().
In the parent window of the CheckBox control handle the WM_COMMAND message: on BN_CLICKED notification coming from the CheckBox control call in turn the DLL's function OnMyCheck.

Re: Help DLL

Albert Holguin5-Apr-11 4:18

Albert Holguin

5-Apr-11 4:18

both good answers, my 5 to both. Smile | :)

Re: Help DLL

so0_lanhlung26-Apr-11 4:44

so0_lanhlung2

6-Apr-11 4:44

thanks so much Smile | :)

Disk Full Error

john56323-Apr-11 23:31

john5632

3-Apr-11 23:31

I am using cFileDialog to save a file on disk, I used OFN_OVERWRITEPROMPT flag to prompt for overwriting a file. Is there anytihing can be done if drive is full?

Re: Disk Full Error

enhzflep4-Apr-11 0:23

enhzflep

4-Apr-11 0:23

You mean you're using cFileDialog to get the filename or to save the file? (or both?)

Er, um - why wouldn't you just catch the error-code generated by calls to CreateFile or WriteFile - surely there will be a hint of the lack of diskspace there??

Alternately, if you wish to prevent the selection(creation) of a file on a disk that you already know to be full - wouldn't you just check the returned path from an OpenFileDialog - ensuring that it doesn't exist on the full disk. If the prohibited disk is chosen, you could just re-show the dialog along with a message advising the user to choose a location on another drive.

Re: Disk Full Error

Luc Pattyn4-Apr-11 1:27

Luc Pattyn

4-Apr-11 1:27

You might check for sufficient disk space (using GetDiskFreeSpaceEx) before asking for a specific file path, but then you would be assuming the partition or disk to be known beforehand. Or you might check all partitions to make sure each of them has sufficient free space, but then every small or full partition would distract the user's attention. So you have to choose an approach that fits your most likely situation.

Smile | :)

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Re: Disk Full Error

Maximilien4-Apr-11 3:48

Maximilien

4-Apr-11 3:48

The file dialog only responsibility is too get the name of a file (and path), it does not know the size of the data to be written to the disk.

You could add a hook to warn about low disk space when the user change the path in the file dialog.

It's your job to handle errors from the various APIs and SDK calls that will create the file.

Watched code never compiles.

How to get nChar ( keycode ) from TCHAR ?

_Flaviu3-Apr-11 22:02

_Flaviu

3-Apr-11 22:02

If I get locale decimal point in follow way :

TCHAR m_chDecimalSymbol;

m_chDecimalSymbol = _T('.');

	int nResult = ::GetLocaleInfo(LOCALE_USER_DEFAULT,LOCALE_SDECIMAL,sTemp.GetBufferSetLength(2),2);
	sTemp.ReleaseBuffer();
	if(nResult)m_chDecimalSymbol = sTemp[0];

and now I want to know which is keycode of m_chDecimalSymbol :

UINT nDecimal = m_chDecimalSymbol - '0'; \\ <-- is wrong

can you help me , please ?

Re: How to get nChar ( keycode ) from TCHAR ?

CPallini3-Apr-11 22:41

CPallini

3-Apr-11 22:41

Flaviu 2 wrote:
UINT nDecimal = m_chDecimalSymbol - '0'; \\ <-- is wrong

Why are you using such (wrong) technique? Shouldn't be VK_DECIMAL the (virtual) key code you are looking for?
Smile | :)

Re: How to get nChar ( keycode ) from TCHAR ?

_Flaviu3-Apr-11 23:37

_Flaviu

3-Apr-11 23:37

Here is remarks of VK_DECIMAL :
A virtual key code for the numeric keypad DECIMAL POINT (.) key.

but what is happen if the user hit point (.) not from numeric keyboard ? Or when decimal separator is comma (,), not point ?

Re: How to get nChar ( keycode ) from TCHAR ?

CPallini3-Apr-11 23:53

CPallini

3-Apr-11 23:53

Flaviu 2 wrote:
but what is happen if the user hit point (.) not from numeric keyboard ?

You are right on this, it wouldn't be detected.

Flaviu 2 wrote:
Or when decimal separator is comma (,), not point ?

You are wrong here, the key on numerical keypad alway corrensponds to the decimal separator.
Smile | :)

Re: How to get nChar ( keycode ) from TCHAR ?

_Flaviu4-Apr-11 0:31

_Flaviu

4-Apr-11 0:31

I learn something here , that the point key from numerical keyboard corespond to decimal separator , whatever it would be , thank you for that ... but still , I didn't know how to get keyboard code of global decimal separator ... Frown | :(

Re: How to get nChar ( keycode ) from TCHAR ?

CPallini4-Apr-11 0:28

CPallini

4-Apr-11 0:28

Flaviu 2 wrote:
but what is happen if the user hit point (.) not from numeric keyboard ?

You may find the scan code for such a key this way (at least it works on my system):

C++

TCHAR a[2];
int nResult = ::GetLocaleInfo(LOCALE_USER_DEFAULT,LOCALE_SDECIMAL,a,2);
SHORT vkCode =  VkKeyScan(a[0]);

Re: How to get nChar ( keycode ) from TCHAR ?

_Flaviu4-Apr-11 0:49

_Flaviu

4-Apr-11 0:49

Didn't working , because

SHORT nDecimal = VkKeyScan(m_chDecimalSymbol);

return 190 , which is not 46 (.) ....

Re: How to get nChar ( keycode ) from TCHAR ?

CPallini4-Apr-11 1:51

CPallini

4-Apr-11 1:51

It's correct: 190 is VK_OEM_PERIOD, that is the scan code of (the lef hand) key for the '.'.

Re: How to get nChar ( keycode ) from TCHAR ?

Stefan_Lang4-Apr-11 0:28

Stefan_Lang

4-Apr-11 0:28

Flaviu 2 wrote:

sTemp.ReleaseBuffer();
if(nResult)m_chDecimalSymbol = sTemp[0];

As an aside, you should swap these two lines. Doesn't make sense to read sTemp after releasing its buffer... Wink | ;)

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