C / C++ / MFC Discussion Boards

Kurotora24-Aug-01 9:03

24-Aug-01 9:03

Hi,

I've been writing DLL that attaches to any process by using global hook, and I need to handle attach/detach operation. It is working fine except when I abort debugging program with msdev. I'm using Japanese version of msdev so I can't tell you the exact name of menu title to ABORT debugging, but we sometimes do that for various reasons. In that case, DllMain was not called with DLL_PROCESS_DETACH. And it seems DLL is left loaded. (The reason I think so is: I can't delete that DLL file even after I ended my application which unloads all DLLs from memory.) I'm doing this on Win2K. And not that program being debugged with msdev is not a program that loads the DLL and let attach to processes.

Is that a problem by design? If someone knows any documents describing this, please let me know.

Thanks.

Kurotora

Re: missing DLL_PROCESS_DETACH

Tomasz Sowinski24-Aug-01 9:14

Tomasz Sowinski

24-Aug-01 9:14

There may be a hint in the TerminateProcess API docs:

TerminateProcess causes all threads within a process to terminate, and causes a process to exit, but DLLs attached to the process are not notified that the process is terminating.

So, if 'End debugging' command is implemented with a call to TerminateProcess, your DLL won't be nofified.

Tomasz Sowinski -- http://www.shooltz.com

Re: missing DLL_PROCESS_DETACH

Kurotora24-Aug-01 20:45

Kurotora

24-Aug-01 20:45

Tomasz,

Thank you giving me hint. Can you/anyone let me clear that DLLs are unloaded but not just notified to it? Basically it should I hope though I had a problem with never-unloading-dll.

Thanks.

I love Code Project, do you?
Kurotora

Re: missing DLL_PROCESS_DETACH

Carlos Antollini24-Aug-01 9:47

Carlos Antollini

24-Aug-01 9:47

Stupid Question but....
Did you use, the FreeLibrary() function in your Aplication?

Regards
Wink | ;)

Carlos Antollini.

Re: missing DLL_PROCESS_DETACH

Kurotora24-Aug-01 21:00

Kurotora

24-Aug-01 21:00

Carlos,

Yes. My application unloads my DLLs with FreeLibrary() and do this up to 100 times until GetModuleFileName() returns 0 which means my DLLs are unloaded from memory. Normaly it's working fine.

Can anyone know how to unload DLL perfectly without rebooting system?

Thanks.

I love Code Project, do you?
Kurotora

Getting the current URL from IE

LukeV24-Aug-01 7:52

LukeV

24-Aug-01 7:52

Let's say I have an application that has an icon added in IE's toolbar. When I click the icon, I'd like it to open my app along with the current URL so my app can use it. Is there a way to do this?

Thanks! Smile | :)

Repositioning controls on re-size.

John Uhlenbrock24-Aug-01 7:28

John Uhlenbrock

24-Aug-01 7:28

My dialog bar has various controls, that don't take up the whole screen. When the main frame resizes, I want these controls to reposition themselves so they are relatively centered. For example, if a control's left side, is 150 left of the center of the main frame, I want it to always be 150 left of the center of the main frame, no matter what size the main frame is. I can't seem to come up with a simple way to do this, whereas I do not want to have to create variables for each control.

Wizard Dialogs and SetFocus

24-Aug-01 7:00

I have built a Wizard Dialog and on the front page have 3 drop down boxes and one edit box at the top.

I am trying to force the edit box to take the focus on initdialog but I am having no luck.

I have an edit Control variable and I am setting it to focus and I am setting the return value of OnInitDialog to false, just like you do with normal dialogs, but the second item which is a dropdown list continues to have the foucs.

Any idea why this problem is occuring.

thanks

Re: Wizard Dialogs and SetFocus

Masaaki Onishi24-Aug-01 7:58

Masaaki Onishi

24-Aug-01 7:58

Hello, the codegurus around the world.;)

Generally speaking, your approaches should work only when the dialog is created.

In a wizard dialog, if we click the back button to go back to the first page,
OnInitDialog is never called since the dialog is already created.

So, try to chanage the tab order to make Edit box the number one by the resource editor.
Try to put the code - m_MyEdit.SetFocus() before return FALSE;
Try to put the same code in CMyPropertyPage::OnSetActive() for clicking the back
button.

Have a nice day!

-Masaaki Onishi-

Closing initial Document in MDI

24-Aug-01 6:16

Hi, I'm wondering if anyone knows how I can get rid of the initial document window that displays when an MFC MDI program first starts up? I am writing a program that would acquire images from a scanner. It would not make sense to have an empty white canvas before acquring any scans.

I believe there's a function OnDocumentClose function I can use, but I have no idea where I can place such a call. Also, how would I create a new canvas? Is there a "OnDocumentOpen" of sort?

Thanks!
Jerry

Re: Closing initial Document in MDI

Tim Deveaux24-Aug-01 6:39

Tim Deveaux

24-Aug-01 6:39

You can suppress this 'new file' action with

cmdInfo.m_nShellCommand = CCommandLineInfo::FileNothing;

in your apps InitInstance.

Doesn't work for SDI though.

Re: Closing initial Document in MDI

Dave Glick24-Aug-01 8:47

Dave Glick

24-Aug-01 8:47

To answer your second question the way I've always done it is as follows:

1) Find the document template (each template is a different doc/view class - you probably only have one in which case just ignore the last two lines)...

POSITION DocPosition;
DocPosition = GetFirstDocTemplatePosition();
CDocTemplate* first_template = GetNextDocTemplate(DocPosition);
CDocTemplate* second_template = GetNextDocTemplate(DocPosition);
CDocTemplate* third_template = GetNextDocTemplate(DocPosition);

2) Create a new file

CSomethingDoc* newdoc = STATIC_DOWNCAST(CSomethingDoc, first_template->CreateNewDocument());

3) Do any work in the Document class you need to and then show the new file

CFrameWnd* newframe = first_template->CreateNewFrame(newdoc, NULL);
newframe->InitialUpdateFrame(newdoc, TRUE);

Hope that helps.

-Dave

Re: Closing initial Document in MDI

Jerry Wang27-Sep-01 9:56

Jerry Wang

27-Sep-01 9:56

Hi Dave, it's been a while, but thanks for your posted reply on how to create a new document in CWinApp. I didn't get a chance to implement it until now.

I have a follow up question I hope you can help me with. The code you described to me is for CWinApp class. How would I be able to do the same thing inside MainFrm class? Obiously GetFirstDocTemplatePosition() is only exsistant in CWinApp, and I do not know of a way to acquire a pointer to CWinApp from MainFrm. Would you know a way to do that? I appreciate it. Thank you.

Jerry

Re: Closing initial Document in MDI

J Patel27-Sep-01 10:12

J Patel

27-Sep-01 10:12

Use AfxGetApp(); This can be called from your main frame class.

HTH

Jignesh

Re: Closing initial Document in MDI

Jerry Wang27-Sep-01 10:30

Jerry Wang

27-Sep-01 10:30

Worked like a charm!! Big Grin | :-D

Thank you thank you.

Re: Closing initial Document in MDI

Dave Glick28-Sep-01 2:31

Dave Glick

28-Sep-01 2:31

No problem...
Try looking into AfxGetApp()

-Dave

Re: Changing Documents in SDI app

Ben Burnett24-Aug-01 15:55

Ben Burnett

24-Aug-01 15:55

try replacing your calls with;

SaveModified();
AfxGetApp()->OpenDocumentFile ( _T ( "C:\\your_document.ext" ) );

BTW: OnOpenDocument() should not be called directly, it is used by the framework in response to the File Open command... the framework does allot of initialization before and after it calls this.

Ben Burnett

---------
On the topic of code with no error handling -- It's not poor coding, it's "optimistic" Wink | ;)

Find controls on Window

24-Aug-01 5:02

I have a function which returns the Window-handle of the foreground-window like this:

CWnd* pWnd = GetForegroundWindow();

Now I want to check whether there's a CEdit-Control within that window.
How can I achieve this?

thanks in advance

Re: Find controls on Window

Matt Gullett24-Aug-01 5:06

Matt Gullett

24-Aug-01 5:06

You need to use EnumChildWindows and then GetClassName to check for the EDIT class of window.

Re: Find controls on Window

24-Aug-01 5:52

Something seems to be wrong with this code Frown | :(

BOOL CALLBACK FindEdit(HWND hwnd, LPARAM lParam)
{
BOOL ret = TRUE;

HWND child = ::GetWindow(hwnd,GW_CHILD);
if(child != NULL)
{
char classname[128];
GetClassName(child,classname,sizeof(classname));
MessageBox(NULL,classname,"Class",MB_OK);
}

return ret;
}

HWND child always is NULL

Or do I need to do in a different way?

Re: Find controls on Window

Matt Gullett24-Aug-01 6:05

Matt Gullett

24-Aug-01 6:05

You need the GetWindow line. The hwnd parameter passed to the callback function is the child window handle. Just call GetClassName on hwnd.

Re: Find controls on Window

24-Aug-01 6:07

OK, now I have this one:

BOOL CALLBACK FindEdit(HWND hwnd, LPARAM lParam)
{
char classname[80];
GetClassName(hwnd,classname,80);
if((strcmp(classname,"edit")) == 0)
{
::SetWindowText(hwnd,"Test");
::CloseWindow(hwnd);
return 0;
}

return 1;
}

this does not work either, altough a window with class "edit" has been found

Re: Find controls on Window

24-Aug-01 6:17

I have found the problem Smile | :)

Deleting a dynamically allocated 2d array

Josh Knox24-Aug-01 4:11

Josh Knox

24-Aug-01 4:11

Hey everyone,
I'm having a problem deleting a dynamically allocated array of strings.

I do something like this to allocate the array of strings:

.
.
.
char** arrayofstrings = new char*[stringcount];    //allocate an array of string pointers

for(int i = 0; i < stringcount; i++)               
{
     arrayofstrings[i] = new char[MAX_STRING];     //set each pointer in the array to an array of chars
}
.
.
.

I do something like this to delete the array of strings:

.
.
.
for(i = 0; i < stringcount; i++)
{
     delete [] arrayofstrings[i];                //delete each string in the array
     arrayofstrings[i] = NULL;
}

delete [] arrayofstrings;                        //delete the array of string pointers
arrayofstrings = NULL;

The deletion code always crashes. I've done this before with no problem, but its early and I've got a splitting hangover(damn Thirsty Thursday) and can't seem to make sense of it.

Can anyone point me in the right direction?

Oh yeah, what's the tag to format my code in the forums?

Thanks for any help....

Josh
josh@that-guy.net

Re: Deleting a dynamically allocated 2d array

Tim Deveaux24-Aug-01 6:00

Tim Deveaux

24-Aug-01 6:00

A bad stringcount of zero for new char*[stringcount] would cause problems. Good place for an assert, if stringcount is being passed in.

Use the <pre> tag to format code - for more info, see the C++ FAQ Smile | :)

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