C / C++ / MFC

Providing an implementation of virtual void CMyFormView::PreTranslateMessage(MSG* pMsg) in order to know when the user presses return, focus, CListCtrl

31-Jul-08 7:32

Why is there a DoModal call in two places?

You do know DoModal doesn't return until the dialog
is dismissed right?

You also can only call methods on MFC window objects on the same thread
the window was created on.

Again, your design is unnecessarily complex. Just create a modeless progress
dialog on the UI thread, fire off your worker thread, and let the worker thread
post messages to the modeless dialog to update the progress bar.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Sternocera30-Jul-08 1:24

Sternocera

30-Jul-08 1:24

Hello,

I'm having a problem with my MFC program. It's an MS outlook style splitter window application. In one of it's CFormViews, I want the user to be able to open a dialog that relates to the currently selected row of a report style List, when they press return, just like MS outlook. If the user interacts with the view, this virtual function is called:

BOOL CMyFormView::PreTranslateMessage(MSG* pMsg)
{
	// If the focus isn't the ReportCtrl, we aren't
	// interested in catching the message
	if(GetFocus() != &ReportCtrl)
		return CFormView::PreTranslateMessage(pMsg);
	// If the user has pressed enter, post a message
	// to the current view
	if (pMsg->wParam == VK_RETURN )
	{
		PostMessageA(ID_OPEN_RECORD,0,0); // Post a message that opens the dialog
		// Don't return CFormView::PreTranslateMessage(pMsg);
		// Don't propogate message any further - 
		// catch it
		return TRUE;
	}
	return CFormView::PreTranslateMessage(pMsg);
}

When this dialog is closed, I highlight ReportCtrl in this manner:

// This is part of the function mapped to the ID_OPEN_RECORD message:
...
MyDialog.DoModal(); // makes View lose focus - it goes to the navigation Tree View on the left
ReportCtrl.SetFocus(); // Get back lost focus - if this line is removed, problem goes away, but then
// user loses focus
....

Unfortunately, this has an odd effect; When I press return in the child dialog, the dialog's default button, OK, is pressed, but then "the enter" somehow propogates down to CMyFormView, causing the dialog to immediately respawn - That's obviously not desirable. What should I do? How can I make the Right pane/ CFormView get back focus without this happening?

For some reason, directly calling the function mapped to the ID_OPEN_RECORD Message, or Sending rather than posting a message, causes assertion failures. I didn't make the ID_OPEN_RECORD especially to solve this problem though - It was originally created so that the user could press an "open record" button on the toolbar, and have that work in every view.

Regards,
Sternocera

C++ MySQL without libmysql

aceralex30-Jul-08 0:35

aceralex

30-Jul-08 0:35

Hi all!

I'am working on an application, that connects to a mysqlhost
in the internet. for this i used the mysql c api and the libmysql.dll
in a mfc application project.
This works fine but no i want to compile an application, that does
not need the libmysql.dll.

Is there any possibility to connect to a mysqlserver without libmysql.dll?
Or can i merge the libmysql.dll into my application, so that i only have one
working exe file?

Thanks in advance! Smile | :)

Sternocera30-Jul-08 1:26

Sternocera

30-Jul-08 1:26

Why do you want to compile an application that does not need libmysql.dll?

aceralex30-Jul-08 1:39

aceralex

30-Jul-08 1:39

Hi,

at work i have to deploy a stand alone exe application, that has
no dependency to any libraries, that are non standard on windows
platforms. also, because the programm is used commercial, we are
not allowed to supply our programm with libmysql.dll to custommers.

thats the reason, because i have to work without libmysql.dll.

Mark Salsbery30-Jul-08 6:56

30-Jul-08 6:56

You can't. No matter what RDMS you use, there's going to be some
required dependency, even using ODBC/ADO/etc.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

enhzflep30-Jul-08 16:28

enhzflep

30-Jul-08 16:28

I'm a little curious as to why not.

I mean, you can use something like Thinstall or MoleBox or PBundle or AlloyFiles to package a whole bunch of files into a single .exe file.

You can use FileMon to get a list of all the file transactions made by an app, allowing you to ensure that you don't inadvertantly miss a file, as FileMon will list all files that have an open,read or write operation performed.

I've got a single .exe file that contains all of Office 2007 on my flash drive. I've also got single-exe-file versions of 3dsMax, Maya & ZBrush. Surely a simple DB program would be a snap comapared to these?

simon

Mark Salsbery31-Jul-08 7:37

31-Jul-08 7:37

Linking to a library and packaging files into single executables
are two different things.

To avoid the separate DLL, you need to be able to statically link to the
LibMySQL libraries. Can you build a static library from the libmysql sources?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

enhzflep31-Jul-08 14:39

enhzflep

31-Jul-08 14:39

Mark Salsbery wrote:
Linking to a library and packaging files into single executables
are two different things.

Yup, sure are. If you link to a static lib, then a flaw is discovered you're in the unenviable position of having to roll-out a replacement exe file. It also means that your app may consist of many files.

If on the other hand, you package the DLL-using app with Thinstall for example, if a flaw is discovered in the bundled DLL file, you can just drop the updated DLL file into the application's sandbox folder and the app will use the new DLL rather than the packaged one. So, you still get the best of both worlds with Thinstall. You also get the advantage of a single compressed file, which alone is a good enough reason to package something if it will be used on a usb drive or via a network.

Mark Salsbery wrote:
Can you build a static library from the libmysql sources?

Yeah, course you can build either a static or a dynamic version of a mySQL app. You've just gotta link with mysqlclient.lib rather than libmysql.lib, which simply loads libmysql.dll on demand.

Mark Salsbery31-Jul-08 15:34

VK_BACK is not working when button is clicked [Solved]

31-Jul-08 15:34

Apparently I missed the entire point of your question Smile | :)

I thought you wanted to eliminate shipping libmysql.dll with your app.
The only way to do that is statically link to a static library version
of that DLL.

Sorry!
Mark

*edit* well shoot - you aren't even the OP LOL  I'm not sure what you're getting at...<br />
as I understand it, the OP is NOT allowed to ship the DLL.

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

ShilpiP30-Jul-08 0:17

ShilpiP

30-Jul-08 0:17

Hi All,
I am working on one application where i use an edit control and on button click i just want to delete the text of edit box using VK_BACK.
my code is

HWND hWnd = NULL;
hWnd = ::GetDlgItem(m_hWnd, IDC_EDIT);
::SendMessage(hWnd, WM_KEYDOWN, (WPARAM)0, (LPARAM)VK_BACK);

Thanks in advance. Smile | :)

Yes U Can ...If U Can ,Dream it , U can do it ...ICAN

modified on Wednesday, July 30, 2008 8:28 AM

Matthew Faithfull30-Jul-08 0:23

Matthew Faithfull

30-Jul-08 0:23

Perhaps the Edit control is coded to respond to WM_KEYUP rather than WM_KEYDOWN, or maybe these are ignored in favour of WM_CHAR. It's possible, although unlikely, that you might need to send all 3 in the right order. If none of that works you'll need to do a GetText and something to get the cursor position, remove a character yourself and do a SetText to put the modified text back.

"The secret of happiness is freedom, and the secret of freedom, courage."
Thucydides (B.C. 460-400)

_AnsHUMAN_ 30-Jul-08 0:26

_AnsHUMAN_

30-Jul-08 0:26

Is using VK_BACK a constraint?

Shilpi Boosar wrote:
button click i just want to delete the text of edit box "

Since you want to delete the text in the edit box why don't you simply use SetWindowText(/*windowhandle*/,"").

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_

ShilpiP30-Jul-08 1:22

ShilpiP

30-Jul-08 1:22

No because my main concern is to delete the text of edit box using VK_BACK when i click the button.

Yes U Can ...If U Can ,Dream it , U can do it ...ICAN

_AnsHUMAN_ 30-Jul-08 1:47

_AnsHUMAN_

30-Jul-08 1:47

This should work then.

::SendMessage (hwndEdit,WM_CHAR,(WPARAM)VK_BACK,(LPARAM)1);

Rate it if this helps

Somethings seem HARD to do, until we know how to do them.
Wink | ;-)

_AnShUmAn_