Re: LVN_BEGINDRAG - C / C++ / MFC Discussion Boards

baerten9-Jul-07 21:51

9-Jul-07 21:51

Hi everybody,

i put a ListControl on a dialog and want to catch the LVN_BEGINDRAG Handler.
I know that LVN_BEGINDRAG is a notify message.

I tried already :

ON_NOTIFY_REFLECT(LVN_BEGINDRAG,OnBeginDrag)

and via :

OnNotify(WPARAM w,LPARAM l, ...
{
if(((LPNMHDR)l)->code == LVN_BEGINDRAG)
int ok = 1; --> breakpoint

but i can't catch it Unsure | :~

I tried also directly to add a handler via the ressource editor by adding a new handler,
but there i can't find the LVN_BEGINDRAG handler, only DoubleClick, Set & KillFocus ...

How should i catch it?

Big thanks Smile | :)

Re: LVN_BEGINDRAG

Aamir Butt9-Jul-07 23:35

Aamir Butt

9-Jul-07 23:35

Try this:

ON_NOTIFY(LVN_BEGINDRAG, IDC_LISTVIEW1, OnLvnBeginDrag)

This should work.

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I'm very disappointed with that attitude.
I can assure you it is much, much more important than that. -- Bill Shankly"

Re: LVN_BEGINDRAG

baerten10-Jul-07 0:02

baerten

10-Jul-07 0:02

Thanks for your answer Smile | :)

Is it necessairy to create a class from this Listbox from which i want to catch the Drag?

Because it won't work Frown | :(

Re: LVN_BEGINDRAG

Hamid_RT10-Jul-07 1:22

Hamid_RT

10-Jul-07 1:22

Dont need to it.Maybe you want to see Drag and Drop between and within a CListCtrl[^].(if you want to listctrl on your previous message)

WhiteSky

Re: LVN_BEGINDRAG

baerten10-Jul-07 3:38

baerten

10-Jul-07 3:38

Thanks for the tutorial,

but i really don't find where i can add the LVN_BEGINDRAG-handler via the classwizard.
I tried a lot of things, but no way to find a LVN_BEGINDRAG.

Unsure | :~

Re: LVN_BEGINDRAG

Mark Salsbery10-Jul-07 6:28

Mark Salsbery

10-Jul-07 6:28

You may actually have to type it in by hand Smile | :)

For the handler prototype(s), see ON_NOTIFY and WM_NOTIFY Messages[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++

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Re: LVN_BEGINDRAG

Hamid_RT10-Jul-07 8:34

Hamid_RT

10-Jul-07 8:34

Insert this code to your program

///On the cpp file insert these codes
BEGIN_MESSAGE_MAP(CDialogDlg, CDialog)
	ON_NOTIFY(LVN_BEGINRDRAG, IDC_LIST2, OnLvnBeginrdragList2)
END_MESSAGE_MAP()


void CDialogDlg::OnLvnBeginrdragList2(NMHDR *pNMHDR, LRESULT *pResult)
{
	LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
	// TODO: Add your control notification handler code here
	*pResult = 0;
}

///And on the header file insert this code
	afx_msg void OnLvnBeginrdragList2(NMHDR *pNMHDR, LRESULT *pResult);

WhiteSky

Re: LVN_BEGINDRAG

baerten10-Jul-07 21:11

baerten

10-Jul-07 21:11

Big thanks Smile | :)

,

my code was completely correct, but probably the CListbox don't support drag&drop,
with CListCtrl it works fine

Re: LVN_BEGINDRAG

Hamid_RT10-Jul-07 21:28

Hamid_RT

10-Jul-07 21:28

I suggest use of CListCtrl on your program its better and very flexible than CListBox.;)

WhiteSky

Method SetEnvironmentVariable not working !

Yanshof9-Jul-07 20:52

Yanshof

9-Jul-07 20:52

Hi All,

I calling the method SetEnvironmentVariable and i getting back return value that is nonzero and the last Error does not return to me nothing.

BUT

The Environment Variable is not set !?

What to do ?

Thanks for any help.

Re: Method SetEnvironmentVariable not working !

Naveen9-Jul-07 21:40

Naveen

9-Jul-07 21:40

Yanshof wrote:
SetEnvironmentVariable

This function will set the environment variable for the current process only. I will not change the whole system's environment variable.

nave

[OpenedFileFinder]

Re: Method SetEnvironmentVariable not working !

Yanshof9-Jul-07 22:26

Yanshof

9-Jul-07 22:26

Thanks,

How can i create new environment variable and/or change exist one data ?

Re: Method SetEnvironmentVariable not working !

Dominik Reichl9-Jul-07 22:44

Dominik Reichl

9-Jul-07 22:44

See http://www.codeproject.com/tools/SetEnv.asp[^].

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Re: Method SetEnvironmentVariable not working !

David Crow10-Jul-07 3:22

David Crow

10-Jul-07 3:22

To change system environment variables, modify the HKLM\SYSTEM\CurrentControlSet\Control\Session Manager\Environment registry key.

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Desktop drawing

rvdwerf9-Jul-07 20:51

rvdwerf

9-Jul-07 20:51

Hi,

I wanted to make my program to work on the desktop.
like http://desktop-tools.net/clock.html

i tried many things but i just dont know how did they do it? i dont know about any technique to make it transparant.

Is this possible or is it somesort of rendercode that creates a picture from what you need to have on the desktop and so making everything arround the text transparant? i hope there is a easier way.

Greetz
Rob

Re: Desktop drawing

Hamid_RT9-Jul-07 21:19

Hamid_RT

9-Jul-07 21:19

See IActiveDesktop::SetWallpaperfor set wallpaper on the desktop.

WhiteSky

Re: Desktop drawing

rvdwerf9-Jul-07 21:59

rvdwerf

9-Jul-07 21:59

thx but then iam setting the whole wallpaper on every refresh of the application :P
isnt there a more useable way then creating wallpapers the whole time?

Re: Desktop drawing

Hamid_RT10-Jul-07 1:20

Hamid_RT

10-Jul-07 1:20

See Change desktop wallpaper.[^]

WhiteSky

Re: Desktop drawing

Hamid_RT10-Jul-07 21:28

Hamid_RT

10-Jul-07 21:28

Did your solve solve or no?

WhiteSky

Re: Desktop drawing

Mark Salsbery10-Jul-07 6:32

Mark Salsbery

10-Jul-07 6:32

One way (Windows 2000+) is to use Layered Windows[^]

Mark

Mark Salsbery
Microsoft MVP - Visual C++

This episode brought to you by the letter Z

Printing zero in file

rp_suman9-Jul-07 20:01

rp_suman

9-Jul-07 20:01

I am trying to print all the characters in MIDI command to a file.
If I open and see file in binary editor, all the characters like 0xF0, 0x43 are OK except the zero. How can I print zero in file.
If I add zero to CString it is not added in CString actually.
The code is:

FILE *pFile;<br />
CString strOut = "";<br />
unsigned char uc;<br />
pFile = fopen("DEBUG_FILE.TXT","a");<br />
for(int i = 0; i < lpMIDIOut->Header.dwBufferLength; i++){<br />
	strOut = "\0";<br />
	uc = lpMIDIOut->bBuffer[i];<br />
	strOut += uc;	<br />
	if(uc == 0){<br />
		fprintf(pFile,"0","%d");<br />
	}<br />
	else<br />
		fprintf(pFile, strOut, "%c");<br />
}<br />
fprintf(pFile, "\n");<br />
fclose(pFile);<br />

Best Regards,
Suman

Re: Printing zero in file

Peter Weyzen9-Jul-07 20:08

Peter Weyzen

9-Jul-07 20:08

Yuk!

Writing binary data into a text file? You should know better than to do that.

You could at least encode the non-printable characters using some sort of encoding? Look at how HTML encodes stuff.

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Staff Engineer<br />
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Re: Printing zero in file

CPallini9-Jul-07 21:00

CPallini

9-Jul-07 21:00

rp_suman wrote:
fprintf(pFile, strOut, "%c");

rp_suman wrote:
fprintf(pFile,"0","%d");

Format specification fields must precede actual data.

BTW, what are you trying to do? Do you want to write a text file with the hexadecimal representation of the data?

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.

Re: Printing zero in file

rp_suman9-Jul-07 22:16

rp_suman

9-Jul-07 22:16

CPallini wrote:
Do you want to write a text file with the hexadecimal representation of the data?

Yes, but I want to know how to write the zero when the unsigned char variable value is zero.
Best Regards,
Suman

BTW, Zero is finded out by India, I am an Indian, but I'm struggling how to print that!!

Re: Printing zero in file

CPallini9-Jul-07 22:48

CPallini

9-Jul-07 22:48

Have a llok at the following code snippet:

unsigned char buffer[]={ 65, 48, 0, 96 };

int i;
FILE * fpOut = fopen("out.txt", "w");
for (i=0; i<sizeof(buffer); i++)
{
  fprintf(fpOut, "%02x", buffer[i]);
}
fclose(fpOut);

it outputs a file whose content is:

41300060

That is the hexadecimal representation of the buffer (note: each byte is represented with a couple of hexadecimal digits, i.e. Zero is 00)

Hope that helps.

BTW, maybe who invented Zero was far more smarter than me and you...
Big Grin | :-D

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.

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