ON_MESSAGE event - C / C++ / MFC Discussion Boards

Re: inputing string & int from file to array.

David Crow1-Jun-07 4:13

David Crow

1-Jun-07 4:13

That helps. Thanks.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

CPrintDialog issue

Andy H30-Oct-06 8:59

Andy H

30-Oct-06 8:59

I came accross this little issue with the a CPrintDialog dialog.

Using the debug build of my code when I display the print setup dialig with the DoModal() method, I get a dialog with the attached printers displayed in a ListView. But in my release build of my code I get a dialog showing the attached printers in a combo-box! Also, in the debug version of the code selecting one of the printers to be the default printer does actually set the selected printer as the default printer but doing the same using the release build the default selection isn't retained by the OS! Both the release and debug builds are using the exact same code and there are no debug defines!

I would appreciate anyones advice on why this is happening, and any way to overcome the problem with the release build not being able to set the default printer, whereas the correct functionality is obtained in the debug build.

VS 2003 .NET System Path

BlitzPackage30-Oct-06 8:20

BlitzPackage

30-Oct-06 8:20

Once again this blasted IDE has brought this neophyte to his knees. My question is: how do you set the system path in Visual Studio 2003. I have been toiling away for the better part of 3 hours to try and get it to see the DLL that's on my hard drive, but it can't see it. Truthfully, I feel like crying.

Alas, any help you can give me would be greatly appreciated - as always.

Peace,
BP

Re: VS 2003 .NET System Path

Mark Salsbery30-Oct-06 9:01

Mark Salsbery

30-Oct-06 9:01

Here's the search order for DLLs, from the platform SDK

The directory from which the application loaded.
The current directory.
The system directory. Use the GetSystemDirectory function to get the path of this directory.
The 16-bit system directory. There is no function that obtains the path of this directory, but it is searched.
Windows Me/98/95: This directory does not exist.
The Windows directory. Use the GetWindowsDirectory function to get the path of this directory.
The directories that are listed in the PATH environment variable.

Re: VS 2003 .NET System Path

BlitzPackage30-Oct-06 9:11

BlitzPackage

30-Oct-06 9:11

How do I tell it which directory to look in? How do I add another directory to the PATH environment variable? I can't find where to set it.

Thanks,
BP

Re: VS 2003 .NET System Path

Mark Salsbery30-Oct-06 9:37

Mark Salsbery

30-Oct-06 9:37

How To Manage Environment Variables in Windows XP[^]

From your code, if the dll is being implicitly linked (you are not calling LoadLibrary()) then
you'll need to keep the dll in the current search path.
If using LoadLibrary you can specify the path.
To set the PATH environment variable for the current process use SetEnvironmentVariable() API.
To change for all processes it's in the registry, I think at
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment (Path variable is
semi-colon delimited series of paths).

Re: VS 2003 .NET System Path

BlitzPackage30-Oct-06 10:16

BlitzPackage

30-Oct-06 10:16

Wow! Thanks, it worked! You don't know how much you have helped me.

Thanks again,
BP

ON_MESSAGE event

edvintas30-Oct-06 6:33

edvintas

30-Oct-06 6:33

I am using MS Visual Studio 2005 and i have a problem with message events.
***TestApp.h***

class CTestApp : public CWinApp<br />
{<br />
	public:<br />
	CTestApp();<br />
	virtual ~CTestApp();<br />
	virtual BOOL InitInstance();<br />
	afx_msg LRESULT OnMsg(WPARAM wParam, LPARAM lParam);<br />
        DECLARE_MESSAGE_MAP()<br />
};

***TestApp.cpp***

#include "stdafx.h"<br />
#include "TestApp.h"<br />
<br />
#define WM_MY_EVENT	(WM_APP + 100)<br />
<br />
BEGIN_MESSAGE_MAP(CTestApp, CWinApp)<br />
	ON_MESSAGE(WM_MY_EVENT, OnMsg)<br />
END_MESSAGE_MAP()<br />
<br />
void FileWrite(char *data)<br />
{<br />
	FILE *f;<br />
	errno_t err;<br />
	err = fopen_s(&f, "C:\\debug.txt", "a");<br />
	fprintf(f, data);<br />
	fflush(f);<br />
	fclose(f);<br />
}<br />
<br />
CTestApp::CTestApp()<br />
{   <br />
	FileWrite("Constructed\n");<br />
}<br />
CTestApp::~CTestApp()<br />
{<br />
	FileWrite("Destructed\n");<br />
}<br />
<br />
CTestApp theApp;<br />
<br />
BOOL CTestApp::InitInstance()<br />
{<br />
	FileWrite("Initialized\n");<br />
	return false;<br />
}

This is an error message: error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CTestApp::* )(WPARAM,LPARAM)' to 'LRESULT (__thiscall CWnd::* )(WPARAM,LPARAM)'
how can i fix that? Sniff | :^)

Thank you in advance Rose | [Rose]

Re: ON_MESSAGE event

Mark Salsbery30-Oct-06 6:37

Mark Salsbery

30-Oct-06 6:37

Try ON_THREAD_MESSAGE in the app class.
Use ON_MESSAGE in a window class.

Mark

Re: ON_MESSAGE event

edvintas30-Oct-06 6:41

edvintas

30-Oct-06 6:41

then it gives new error message D'Oh! | :doh:

error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall CTestApp::* )(WPARAM,LPARAM)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'

Re: ON_MESSAGE event

Mark Salsbery30-Oct-06 6:47

Mark Salsbery

30-Oct-06 6:47

Sorry about that...your function should return void, not LRESULT Smile | :)

Re: ON_MESSAGE event

edvintas30-Oct-06 7:02

edvintas

30-Oct-06 7:02

dohh.. it is alive Poke tongue | ;-P

thank you

Re: ON_MESSAGE event

Maximilien30-Oct-06 6:56

Maximilien

30-Oct-06 6:56

edvintas wrote:
afx_msg LRESULT OnMsg(WPARAM wParam, LPARAM lParam);

Are you certain you definition of OnMsg match the declaration ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: ON_MESSAGE event

edvintas30-Oct-06 7:06

edvintas

30-Oct-06 7:06

now it matches Smile | :)

so finally changes are:
in *.cpp added

void CTestApp::OnMsg(WPARAM wParam, LPARAM lParam)<br />
{<br />
}

and in *.h
LRESULT to void and ON_MESSAGE to ON_THREAD_MESSAGE
hurahhh... Smile | :)

Re: ON_MESSAGE event

S Douglas30-Oct-06 21:28

S Douglas

30-Oct-06 21:28

There is a good article here at CP covering messages. Message Management
By Joseph M. Newcomer. [^] Definaltly worth a read.

I'd love to help, but unfortunatley I have prior commitments monitoring the length of my grass. :Andrew Bleakley:

CFtpFileFind problems

Dman832230-Oct-06 6:28

Dman8322

30-Oct-06 6:28

I am trying to get the CFtpFileFind class to work. If I test against my company's ftp site, I can connect and navigate(via SetCurrentDirectoy) to the desired directory, but my call to FindFile(NULL) times out, always. Just to see what files were on there, I connected with an ftp client, and it worked fine. There is only a few files on there( < 10 ) so it isn't a timeout due to too many files.

If I change it to connect to the microsoft ftp site(ftp.microsoft.com), I have no problems, FindFile(NULL) succeeds and everything seems to work fine. Is there something that needs to be configured on the ftp server to allow this call to succeed? Any ideas yould be greatly appreciated.

Multiple selection dragging on CListCtrl

skullfire30-Oct-06 6:14

skullfire

30-Oct-06 6:14

In my application I need to handle an event on my CListCtrl icon View. Whenever the user clicks the mouse and drags it to select more than one item, the onMouse Move is not called. Really weird actually, but I need an event to handle this movement.

Re: Multiple selection dragging on CListCtrl

led mike30-Oct-06 6:28

led mike

30-Oct-06 6:28

skullfire wrote:
the onMouse Move is not called.

It works on my machine.

led mike

Re: Multiple selection dragging on CListCtrl

Mark Salsbery30-Oct-06 6:44

Mark Salsbery

30-Oct-06 6:44

Are you handling the WM_MOUSEMOVE event in the correct class?

Re: Multiple selection dragging on CListCtrl

Hamid_RT30-Oct-06 8:17

Hamid_RT

30-Oct-06 8:17

How do you declare it?

WhiteSky

Need Data Encryption Advice

Jethro6330-Oct-06 5:47

Jethro63

30-Oct-06 5:47

Greetings:

I need to encrypt some data in a file that is quite small, in most cases, less than 300 bytes. I just need something simple: Provide the function with a key and a block of data to encrypt and it returns with the block of data encrypted. A similar function to decrypt is needed, of course.

Can anybody suggest something? I would prefer it be a C++ thing.

Thanks in advance,
Mark

Re: Need Data Encryption Advice

David Crow30-Oct-06 6:05

David Crow

30-Oct-06 6:05