List box Help - C / C++ / MFC Discussion Boards

Re: DialogBox - OnIntiDialog Question

JBAK_CP5-Apr-06 13:28

JBAK_CP

5-Apr-06 13:28

Thanks, PostMessage is what I needed.

How can I kill a Process??

pavanbabut5-Apr-06 11:43

pavanbabut

5-Apr-06 11:43

Hi,
I am stuck up in the middle of killing a process created using CreateProcess within a DLL. While using ExitProcess with the crated process's exitcode, it is terminating the parent process too. Is there anyway to kill a process created within a DLL without disturbing the parent process?? Confused | :confused:

. BTW the process that is craeted is an exe file of a console application.
thanks,
-Pav.

Got it, nevermind by using terminate process with process handle that was created Poke tongue | ;-P

-- modified at 18:06 Wednesday 5th April, 2006

Re: How can I kill a Process??

gamitech5-Apr-06 13:00

gamitech

5-Apr-06 13:00

well
you should do it with terminate process
but when opening the process and obtaining the handle you should open it without inheritting from parrent.
OpenProcess(
DWORD dwDesiredAccess,
BOOL bInheritHandle,
DWORD dwProcessId
);
DediredAccess should be PROCESS_TERMINATE
and bInheritHandle should be FALSE

Then terminateprocess should do the job easily;

gabby

Re: How can I kill a Process??

pavanbabut5-Apr-06 13:34

pavanbabut

5-Apr-06 13:34

OpenProcess hmmm... will give it a try sometime... Thanks for your time though..

-Pav

Re: How can I kill a Process??

Stephen Hewitt5-Apr-06 14:00

Stephen Hewitt

5-Apr-06 14:00

Although the practice is rampart - in general it is not safe to go around calling TerminateProcess on processes. This API kills the process on the spot and as such the application doesn't have a chance to clean up after itself. For example it may result in temporary files not being deleted, files or registry entries in a corrupt state as a result of the process being terminated in the middle of an update or worse.

Steve

Re: How can I kill a Process??

pavanbabut5-Apr-06 15:11

pavanbabut

5-Apr-06 15:11

Yep, you are right. But, depending upon the application I think we can go in this way Smile | :)

to get around the problem. But in intensive applications this is not something that is recommended as you said. But, for me, this is good enough as I am using to start and stop NI-Board.

-Pav

Re: How can I kill a Process??

Hamid_RT5-Apr-06 18:45

Hamid_RT

5-Apr-06 18:45

Hi pavanbabut,
maybe it is some helpful to you

http://www.codeproject.com/threads/killprocess.asp[^]

List box Help

celllllllll5-Apr-06 11:39

celllllllll

5-Apr-06 11:39

Hi All,

I need help with the list boxes.I am working with Dlls.
Okay so what I want to do is: I created a list box with some items in it.
For example: FDK01, FDK02...FDK09 means key F1, F2.....F9. Now, I want to perform something like when I select FDK01 in the list box and then say OK ..it should then allow me to pressed button 1. How should I code the list box item to perform what I want?

Thanks in advance

C++Prog

Re: List box Help

thatsme_cool5-Apr-06 18:54

thatsme_cool

5-Apr-06 18:54

Though it's not very clear from ur question but, I guess whenever a list box item is selected & user presses Ok button u want some other button to be selected. is it??
u can use SetFocus method for that

Re: List box Help

Nibu babu thomas5-Apr-06 18:56

Nibu babu thomas

5-Apr-06 18:56

Preeti9 wrote:
I created a list box with some items in it.
For example: FDK01, FDK02...FDK09 means key F1, F2.....F9. Now, I want to perform something like when I select FDK01 in the list box and then say OK ..it should then allow me to pressed button 1. How should I code the list box item to perform what I want?

You can use SendInput for this purpose.

Nibu thomas
Software Developer

SendInput to Inactive Windows Possible?

Coxen5-Apr-06 11:34

Coxen

5-Apr-06 11:34

I'm trying to write a program that takes input and instantly sends it to multiple windows simultaneously. Ultimate goal is to have 5 copies of Notepad open, typing into one, and the program fills out all 5 Notepad windows without ever changing focus from the initial window.

Unfortunately, I dont understand how to accomplish this because everything I read tells me that you must activate an application beforing using SendKeys or SendInput.

Anyone have some ideas? Has this been done before?

Re: SendInput to Inactive Windows Possible?

Ryan Binns5-Apr-06 18:37

Ryan Binns

5-Apr-06 18:37

Send WM_KEYDOWN, WM_CHAR and WM_KEYUP messages (in that order) directly to the notepad windows. You don't need to emulate a keyboard - just tell them that a key has been pressed.

Ryan

"Punctuality is only a virtue for those who aren't smart enough to think of good excuses for being late" John Nichol "Point Of Impact"

Maintaining program control while in a loop...

aquawicket5-Apr-06 11:25

aquawicket

5-Apr-06 11:25

Hi I'm currently trying to code a REAL-TIME midi remapper program in Visual C++ using MFC..

I need the program to constantly look for a input midi signal... The only way I have figured out how to do this is to run a constant loop that contains the midipoll(); I've had to set it to only recieve a certain number of signals so it will eventually end.

I works great and recieves all of the messages.. but while in this loop I loose control of the rest of the program... The loop takes over. Is their a way I can do this without loosing control of the program?

Re: Maintaining program control while in a loop...

Blake Miller5-Apr-06 13:04

Blake Miller

5-Apr-06 13:04

Put that processing into a secondary thread.

People that start writing code immediately are programmers (or hackers), people that ask questions first are Software Engineers - Graham Shanks

Re: Maintaining program control while in a loop...

aquawicket6-Apr-06 9:50

aquawicket

6-Apr-06 9:50

Thanks.. that worked out great using a work thread...

Now i'm having a problem accessing the UI from within the thread.. ie. a listbox
I need to send info to the listbox from within the thread.. Any Ideas

this is what I got...

UINT MyThread( LPVOID pParam ); //prototye

UINT MyThread( LPVOID pParam )
{
while(RunThread) {
If (inputdetected){
m_ListBox1.Additem("input detected"); // <-- I don't have access to ListBox 1 from withing this thread.
}
}
return 0; // thread completed successfully
}

I call the thread to start with..

AfxBeginThread(MyThread, NULL);

-- modified at 15:50 Thursday 6th April, 2006

Re: Maintaining program control while in a loop...

Blake Miller6-Apr-06 10:49

Blake Miller

6-Apr-06 10:49

You can not use the MFC control placeholders from the thread.

Instead, it is better to use the listbox control's window handle directly to add elements to the listbox.

The LPVOID pParam passed to thread could be a data structure, in that data structure, one of the fields could be the window handle for the list box control.

So you call

typedef struct {
HWND hListBox;
} MYSTRUCT ;

MYSTRUCT MyThreadInfo;

MyThreadInfo.hListbox = m_ListBox1.m_hWnd;

then

AfxBeginThread(MyThread, &MyThreadInfo);

UINT MyThread( LPVOID pParam )
{
MYSTRUCT* pMyThreadInfo = (MYSTRUCT*)pParam;

while( RunThread ){
if( inputdetected ){
SendMessage(pMyThreadInfo->hListbox, LB_ADDSTRING, 0, (LPARAM)"input detected");
}
}
return 0; // thread completed successfully
}

People that start writing code immediately are programmers (or hackers), people that ask questions first are Software Engineers - Graham Shanks

Thanks :)

aquawicket6-Apr-06 11:42

aquawicket

6-Apr-06 11:42

AWSOME!!!!! everything works perfectly using this method...
Thanks Blake Wink | ;)

Error R6034: XP Manifest w/ CreateProcess()

fire fly5-Apr-06 10:22

fire fly

5-Apr-06 10:22

This is driving me nuts. I'm trying to call CreateProcess() to start Internet Explorer from within a Manifest-enabled (specifically Common Controls 6) application and I get about 7 dialog boxes that say the exact same thing:

------------------------------
Runtime Error!

Program: C:\Program Files\Internet Explorer\iexplore.exe

R6034
An application has made an attempt to load the C runtime library incorrectly.

Please contact the application's support team for more information.

['OK' button]
------------------------------

After I click through all 7 'OK' dialogs, everything seems to work normally.

The only thing that I've discovered searching Google is that XP Manifests for Common Controls 6 is what seems to be affecting Internet Explorer's startup sequence. CreateProcess() is acting like "if the process starting the new process is XP Manifest enabled, then the new process MUST ALSO be XP Manifest enabled." Now, I know there has to be a workaround because Explorer.exe is XP Manifest enabled and runs new processes all the time (including IE).

Re: Error R6034: XP Manifest w/ CreateProcess()

David Crow5-Apr-06 10:38

David Crow

5-Apr-06 10:38

1) Use CreateProcess() to start another process besides iexplore.exe.
2) Remove the manifest from your project and then try to start iexplore.exe.

What does this uncover?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Error R6034: XP Manifest w/ CreateProcess()

fire fly5-Apr-06 15:23

fire fly

5-Apr-06 15:23

I figured out what the problem was. Well, not EXACTLY what the problem was, but it had to do with sending an incomplete set of environment variables to the new process in the CreateProcess() call.

Thanks anyway. The error message had very little to do with the actual problem (which is what was so strange). Apparently IE relies on the Visual C++ libraries in some way that is dependent on the environment variables passed to it.

Directory Control

jonesap55-Apr-06 8:21

jonesap5

5-Apr-06 8:21

I need to know how to control a directory structure from the "Open" dialog window from an application. I need to be able to restict the user from going to directories that have been determined they should not enter and restrict them to a certain directory. Anyone have any idea how to do this not in MFC, win32 api format.

Thanks,

Re: Directory Control

Waldermort5-Apr-06 8:27

Waldermort

5-Apr-06 8:27

You can restrict them to a single directory using the OFN_NOCHANGEDIR flag. If you need something a little more complicated then create your own OpenFile dialog.

Re: Directory Control

David Crow5-Apr-06 8:37

David Crow

5-Apr-06 8:37

waldermort wrote:
You can restrict them to a single directory using the OFN_NOCHANGEDIR flag.

Wrong. That flag restores the current directory to its original value if the user changed the directory while searching for files.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Directory Control

Waldermort5-Apr-06 8:40

Waldermort

5-Apr-06 8:40

Thanks for pointing that out, learn something new everyday :->

Re: Directory Control

David Crow5-Apr-06 8:37

David Crow

5-Apr-06 8:37

See here.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.