Re: Clipboard API calls - C / C++ / MFC Discussion Boards

Vijay_Mak12-Jan-04 0:22

12-Jan-04 0:22

I have used two dialogs for my Tabbed Dialog control.
In my First Tab Page Contain one ListBox, I can't add/get the ListBox informations FROM 2Page.Kindly help me.

Re: listbox control

ohadp12-Jan-04 2:13

ohadp

12-Jan-04 2:13

Depending on your application design, what you'd like to do eventualy is to get a list-box pointer to the second page.

Your options:
1. Use 'GetListBoxCtrl()' and 'SetListBoxCtrl()' (methods you'll have to write by yourself) from the piece of code that created Both pages and thus transfer a pointer, or the HWND of the ListBox to the second page.

2. Use a global variable to store the ListBox Pointer/HWND.

3. Use a singleton object to hold the same information.

Re: listbox control

Vijay_Mak12-Jan-04 16:45

Vijay_Mak

12-Jan-04 16:45

Do u have the Source Code Example ? It will be more help full.

Re: listbox control

ohadp12-Jan-04 18:53

ohadp

12-Jan-04 18:53

There's not much to show as an example, it's a "design pattern" (or lack thereof) if you twist it enough,

if at some point in your source-code you have code that looks like this :

.<br />
.<br />
.<br />
Pane1.Create()<br />
Pane2.Create()<br />
.<br />
.<br />
.

Simply add the lines
Pane2.SetListBox( Pane1.GetListBox() );

then write these functions:

CPane1::GetListBox() { return m_ListBox.GetSimpleHwnd(); };<br />
CPane2::SetListBox(HWND hWnd) { m_ListBox = hWnd; };

now you can control the listbox by sending messages from inside your Pane2 code to the m_ListBox window like:

SendMessage(LBm_ListBox, _ADDSTRING, ...);

Clipboard API calls

impeham11-Jan-04 23:54

impeham

11-Jan-04 23:54

for the following code, i am getting bret = false . why is that?
-------------------------------------------
if (OpenClipboard(NULL))
{
bret = EmptyClipboard();
char _Error_MSG_Macro_Buffer[MAX_STRING];
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,0,GetLastError(),0,&_Error_MSG_Macro_Buffer[0],MAX_STRING,0);
}
-------------------------------------------
if "OpenClipboard(NULL)" is true, then it should work with no problem, but it fails.
i don't have a window in my application.
"FormatMessage" gives the following:
"Thread does not have a clipboard open.

how can that be?

Re: Clipboard API calls

pratheesh12-Jan-04 1:14

pratheesh

12-Jan-04 1:14

This piece of code works...

{<br />
	HANDLE hClip;<br />
	LPTSTR lptstr;<br />
<br />
		if (!::IsClipboardFormatAvailable(CF_TEXT)) <br />
		{// Show Error Message<br />
			return; }<br />
        if (!::OpenClipboard(NULL)) <br />
		{// Show Error Message<br />
			return;} <br />
 <br />
        hClip = ::GetClipboardData(CF_TEXT); <br />
        if (hClip != NULL) <br />
        { <br />
            lptstr =(LPTSTR) ::GlobalLock(hClip); //Clip-board copying<br />
            if (lptstr != NULL) <br />
            { <br />
			<br />
			MessageBox(lptstr); //or do sthg. else		<br />
		<br />
			 ::GlobalUnlock(hClip); <br />
            } <br />
        } <br />
        ::CloseClipboard(); <br />
}

Re: Clipboard API calls

impeham12-Jan-04 2:19

impeham

12-Jan-04 2:19

I can get the string from the clipboard.
The problem is that i can't set a string to it.
that's the reason i need to use EmptyClipboard.
EmptyClipboard failed.

Re: Clipboard API calls

pratheesh12-Jan-04 18:24

pratheesh

12-Jan-04 18:24

Hi try any of the following links, so that i dont have to repeat the code!
http://www.codeguru.com/clipboard/text_tofrom_clipboard.shtml[^]

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/WinUI/WindowsUserInterface/DataExchange/Clipboard/ClipboardReference/ClipboardFunctions/SetClipboardData.asp[^]

Smile | :)

Re: Clipboard API calls

impeham12-Jan-04 23:48

impeham

12-Jan-04 23:48

i tried using the code from your first link (i changed OpenClipboard() to OpenClipboard(NULL)), but it doesn't work for me.

i am getting "Thread does not have a clipboard open." with GetLastError for "EmptyClipboard" function call.

the function i am using resides in a DLL. could that be the reason for the problem?

Re: Clipboard API calls

pratheesh13-Jan-04 23:23

pratheesh

13-Jan-04 23:23

Hi,
see what MSDN says...

If an application calls OpenClipboard with hwnd set to NULL, EmptyClipboard sets the clipboard owner to NULL; this causes SetClipboardData to fail.

OpenClipboard() and EmptyClipboard()will still work in a .dll
But we need to pass a proper HWND to set clip-board data.

Maybe you can create a window/ or use a window handle temporarily.

Re: Clipboard API calls

David Crow12-Jan-04 5:13

David Crow

12-Jan-04 5:13

This same code snippet worked fine on my machine. Try calling GetOpenClipboardWindow() and/or GetClipboardOwner() after the clipboard is open. This does not solve the problem, but it might help to uncover something that is not immediately obvious.

A rich person is not the one who has the most, but the one that needs the least.

Problem with Wh_getmessage Hook

percyvimal11-Jan-04 23:52

percyvimal

11-Jan-04 23:52

I have done Wh_getmessage hook.
In my filter function i have typecast the Wm_char message

like Say if Char 'A' is pressed i send the char 'A' as it is to the application.

NOw if user press 'B' then what i am doing is changing the Char 'B' to BackSpace character.

TO this point the application is working properly in all application for it is a system wide hook , where pressing of B removes 'A' for B is a backspace character

A , B->backspace

out put = NUll

Now what i am doing is using PostMessage api i am sendging 2 characters to that application which is active

Say POSTMESSAGE(C ,D)

I got these problems:
1. The character C when posted to the application , my filter function is called again and( i have defined a rule for C where if the user type
C then change to E) and i expected C to be printed in the application , but instead E is coming.
I have to find a way how to prevent this ie the postmessage which i have send to the application looping through my filter funcion again and again.

___________________________________________________________________________
2. If i declare like this

A , B->backspace character , Postmessage(C,D)

Expected output
CD

Output obtained in notepad and photoshop
AC and D is removed(Wrong)

Output obtaied in all other application
CD(correct)
_________________________________________________________________________
3. So i tried this method
A , B->NULL , Postmessage(backSpace,C,D)

Expected output
CD
Output obtained in notepad and photoshop
CD(correct)

Output obtaied in all other application
AC and D is removed(Wrong)

Could anyone tell me how i can overcome these problems

Thanks in advance

with regards
vimal

Send message from separate Thread

Cedric Moonen11-Jan-04 23:18

Cedric Moonen

11-Jan-04 23:18

Hi all !
I have a SDI apllication in wich I start another apllication (from the document). I need to make some things when this application has closed so I start a new thread that waits for the termination of this application.

But how can I send a message to the main Thread ?? I read that we cannot pass MFC classes from a thread to another so I cannot pass a pointer to the main window.

Thanks

Re: Send message from separate Thread

Roger Allen11-Jan-04 23:51

Roger Allen

11-Jan-04 23:51

Although CWnd object are not thread safe, they are a wrapper for the windows HWND member, which is. Pass this through as a parameter to the tread and send the message to that.

Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...

Re: Send message from separate Thread

Cedric Moonen11-Jan-04 23:57

Cedric Moonen

11-Jan-04 23:57

Hum hum !
Yes that was so easy that I didn't think about that Unsure | :~

Thanks a lot for reply Wink | ;)

Re: Send message from separate Thread

Cedric Moonen12-Jan-04 2:56

Cedric Moonen

12-Jan-04 2:56

Ok so That works but the problem is I have to pass also the handle to the process I have to wait for.
So I create a structure with the HWND (window) and the HANDLE (process) and I send this to the Thread. This structure is a local one so datas are no more valid after the functions is left.

What is the best solution ? Dynamically create the structure and delete it from within the thread ?? Or what?

Re: Send message from separate Thread

KarstenK12-Jan-04 4:21

KarstenK

12-Jan-04 4:21

You get better results by using "PostThreadMessage" and related macros. And never use CWnd* as as already mentioned.

Try this @ home. (B&B)

Re: Send message from separate Thread

Cedric Moonen12-Jan-04 4:37

Cedric Moonen

12-Jan-04 4:37

I still have to pass two parameters: the HANDLE of the process I have to wait for and the Id of the main Thread. So The problem remains the same...

Or is it a way to retrieve the ThreadId of the application main's Thread ?

Saving information in registry 'HKEY_LOCAL_MACHINE'

JensB11-Jan-04 23:14

JensB

11-Jan-04 23:14

Hi
I want to write information to the registry 'HKEY_LOCAL_MACHINE\Software'.
I don't think it is possible by using the MFC function (WriteProfileString).

How can i fix the problem without having to fear that it won't run perfectly on all windows systems?

What do you guys/girls recommend me?

Greetings
Jens

Re: Saving information in registry 'HKEY_LOCAL_MACHINE'

Roger Allen11-Jan-04 23:54

Roger Allen

11-Jan-04 23:54

No its not possible using the standard MFC functions. We needed to do the same in our app. We took the existing code in the GEtProfileString() and the ancillary functions, pasted them verbatum and changed all the HKEY_CURRENT_USER references to HKEY_LOCAL_MACHINE. After adding a LM to the end of each function name it worked really well.

The only issue you may have is access rights. Depending on how the admin sets up registry access, your application could possible be blocked from writing to HLM.

Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...

Re: Saving information in registry 'HKEY_LOCAL_MACHINE'

Jijo.Raj12-Jan-04 0:07

Jijo.Raj

12-Jan-04 0:07

Use CRegKey class to read and write to registry.

Regards,
Jijo. Wink | ;)

________________________________

Yesterday is history,
Tomorrow is a mystery,
But today is a present.

Re: Saving information in registry 'HKEY_LOCAL_MACHINE'

JensB12-Jan-04 0:13

JensB

12-Jan-04 0:13

I've just read this article:
'http://www.endurasoft.com/techtalk/regdemo2.htm'

Does this API work on all Windows version correctly?

Greetings,
Jens

Re: Saving information in registry 'HKEY_LOCAL_MACHINE'

Jijo.Raj12-Jan-04 1:38

Jijo.Raj

12-Jan-04 1:38

Those SDK Functions will surely work on all window platforms.

Regards,
Jijo. Wink | ;)

________________________________

Yesterday is history,
Tomorrow is a mystery,
But today is a present.

Re: Saving information in registry 'HKEY_LOCAL_MACHINE'

JensB12-Jan-04 2:09

JensB

12-Jan-04 2:09

Well, i'll try the CRegKey class first out.
If that works good enough, i won't use the SDK functions.

Greetings
Jens

Re: Saving information in registry 'HKEY_LOCAL_MACHINE'

Jijo.Raj12-Jan-04 2:13

Jijo.Raj

12-Jan-04 2:13

Okey. CRegKey is easier than SDK methods. If any help, feel free to ask.

Regards,
Jijo. Wink | ;)

________________________________

Yesterday is history,
Tomorrow is a mystery,
But today is a present.

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