Problem with WM_CREATE - C / C++ / MFC Discussion Boards

Senkwe Chanda8-Jul-02 4:03

8-Jul-02 4:03

Hmmm, why would it be NULL only in DEBUG mode though?

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: Wierd GetFileSize problem

C^hris L^osinger8-Jul-02 4:06

C^hris L^osinger

8-Jul-02 4:06

how are you setting hOriginal?

Being just contaminates the void.
--Robyn Hitchcock

Image Processing - easy, like Sunday morning.

Re: Wierd GetFileSize problem

Senkwe Chanda8-Jul-02 4:33

Senkwe Chanda

8-Jul-02 4:33

Like so

HANDLE hOriginal = ::CreateFile(m_EncryptedFilePath,           
               GENERIC_READ,              
               FILE_SHARE_READ,           
               NULL,                      
               OPEN_EXISTING,             
               FILE_ATTRIBUTE_NORMAL,     
               NULL);

Sorry for the delays, I have a darn slow connection over here Smile | :)

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: Wierd GetFileSize problem

C^hris L^osinger8-Jul-02 4:52

C^hris L^osinger

8-Jul-02 4:52

are you testing hOriginal for NULL ?

if GetFileSize fails, it returns 0xffffffff, which, when divided by 64, will give an apparently huge number.

try calling GetLastError after your GetFileSize call.

-c

Being just contaminates the void.
--Robyn Hitchcock

Image Processing - easy, like Sunday morning.

Re: Wierd GetFileSize problem

Senkwe Chanda8-Jul-02 5:14

Senkwe Chanda

8-Jul-02 5:14

Chris, thanks for the help, you certainly pointed me in the right direction. However, the problem was a bit indirect.

m_EncryptedFilePath = "c:\file1.abc".

Now, in debug mode, all is well as I have said. But in release, hOriginal becomes NULL, meaning the file does not exist. (The file does exist).

So I just now tried to change

m_EncryptedFilePath = "C:\\file1.abc"

and lo and behold it works.

Frankly, I don't know why. I'm aware that '\' is an escape sequence but then why does it work for my DEBUG code?

If you have any idea on why this is so (even though the prob itself is solved) I'm all ears.

Regards

Senkwe

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: Wierd GetFileSize problem

Senkwe Chanda8-Jul-02 5:41

Senkwe Chanda

8-Jul-02 5:41

uggh, spoke too soon, still won't work when I pass in the file name as a command line param.

Thanks for the help Chris, I appreciate it Smile | :)

It'll come to me in the morning Dead | X|

Senkwe

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Re: Wierd GetFileSize problem

Senkwe Chanda8-Jul-02 4:52

Senkwe Chanda

8-Jul-02 4:52

Turns out that your guess is correct, I tried the following...

DWORD numBlocks = GetFileSize(NULL, NULL)/64;

and sure enough I got the exact same huge number as before. I'm still stumped as to WHY it's NULL in RELEASE mode but not in DEBUG mode. Could be access rights or permissions.

And when God, who created the entire universe with all of its glories, decides to deliver a message to humanity, He WILL NOT use, as His messenger, a person on cable TV with a bad hairstyle.

Problem with WM_CREATE

S van Leent8-Jul-02 2:40

S van Leent

8-Jul-02 2:40

I am creating my own framework (some already know), but there is one problem handling the WM_CREATE message.

This is my code

EWindow::EWindow(EString caption, EControl *parent, UINT menu) : EControl()
{
this->hInstance = hInstance;
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)OldControlProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCTSTR)menu;
wcex.lpszClassName = caption.GetString();
wcex.hIconSm = NULL;

RegisterClassEx(&wcex);

EString wndclassstr = caption + "___";

hControl = CreateWindow(wndclassstr.GetString(), caption.GetString(), WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, parent->GetHandle(), NULL, NULL, NULL);

SetWindowLong(hControl, GWL_USERDATA, reinterpret_cast<long>(this));
}

As you know, the WM_CREATE Message is sent within the CreateWindow function, but this isn't cought at the right place, because I want him to do it object oriented. So, after the SetWindowLong(...) function. Does anyone know how I can fool the system, so the WM_CREATE message is sent after the SetWindowLong(...)

thanks in advance,

Sjoerd van Leent

LPCSTR Dutch = "Double Dutch Smile | :)

Re: Problem with WM_CREATE

Mike Upton8-Jul-02 3:13

Mike Upton

8-Jul-02 3:13

I believe MFC solves this problem by using a Windows hook. In fact, if memory serves correctly, it uses WH_CBT for this very reason - WH_CBT gives you a hook into the CreateWindow function (HCBT_CREATEWND) that gets called before the WM_CREATE message is sent.

"We are the knights who say Ni" _{(The Knights Who Say Ni)}

Re: Problem with WM_CREATE

S van Leent8-Jul-02 3:18

S van Leent

8-Jul-02 3:18

Now we are coming somewhere Smile | :)

thanks

LPCSTR Dutch = "Double Dutch Smile | :)

Re: Problem with WM_CREATE

S van Leent8-Jul-02 4:23

S van Leent

8-Jul-02 4:23

Is there a way to do it without using a DLL? (Does somebody have the code, or a sample)

thanks in advance,
Sjoerd van Leent

LPCSTR Dutch = "Double Dutch Smile | :)

Configuring Database on a remote machine for DSN in my system

8-Jul-02 2:06

Hi all,
I'm working with a database application.The database for my application is an access database.It is located on a remote machine.The database is password protected.I configured a dsn in my system and the database for that is configured by using the browse button on the 32 bit DSN dialog window.The database is placed on a shared folder in the remote PC.Both machines are running on windows 2000.
In my application i tried to open my database using the following code.But it throws exception.Can any one help me?.
CDatabase db;
db.OpenEx("DSN=regn;;pwd=employee",0);
With regards.

Shibu K.V.
Senior Research Associate.
VLSI ASIC Hardware Design Group
Electronics R&D Centre,Trivandrum
India

Re: Configuring Database on a remote machine for DSN in my system

Prem Kumar8-Jul-02 3:08

Prem Kumar

8-Jul-02 3:08

What description does the exception object contain >?
Did you check the permissions of the remote share ?
It should have permissions to write since the
lock file is created in the same place as the database.

Re: Configuring Database on a remote machine for DSN in my system

sagmam8-Jul-02 5:45

sagmam

8-Jul-02 5:45

try adding 'UID=admin;' to your connection string.

/=/=/=/=
Deus
/=/=/=/=

Please help please urgent......

8-Jul-02 1:57

hi all,
I am using "mciSendString" api function to record the wave audio through
microphone.
My question is how can i capture the audio data in Integer array while recording?
Because I have to Plot the line graph(spectrum) by using these values while recording(real Time)
Please help me.
Is there any other method to Plot the graph while recording(realTime)
Thank in advance.

Re: Attaching to the debugger

Roger Allen8-Jul-02 2:59

Roger Allen

8-Jul-02 2:59

In the debug tab of your project settings, add the filename to the argumenst that would be passed through on the command line. You can then run in debug mode from VC.

Roger Allen
Sonork 100.10016

If I had a quote, it would be a very good one.

add-in question

Hans Ruck8-Jul-02 1:49

Hans Ruck

8-Jul-02 1:49

What can i do to close the current workspace?

rechi

ctrl+alt+del(windows 2000)

slah8-Jul-02 1:43

slah

8-Jul-02 1:43

i want to disable ctrl+alt+del under windows 2000 and SystemParameterInfo() is not working. here is the code

UINT _Junk;

// turn off ctl-alt-del
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,1,&_Junk,0);

// ... do stuff? like what?

// turn on ctl-alt-del
SystemParametersInfo(SPI_SETSCREENSAVERRUNNING,0,&_Junk,0);

what could be the problem, if anybody tells me.

Re: ctrl+alt+del(windows 2000)

DanielP8-Jul-02 5:42

DanielP

8-Jul-02 5:42

it works only for Windows 95/98/Me

Re: ctrl+alt+del(windows 2000)

-Dy9-Jul-02 1:54

-Dy

9-Jul-02 1:54

According to MSDN you shouldn't use SPI_SETSCREENSAVERRUNNING (look up SystemParametersInfo for details). Would SPI_SETSCREENSAVEACTIVE help here? - I don't think it would but it might be worth a try Unsure | :~

If you have MSDN there, look up the article called 'HOWTO: Disable Task Switching on Win32 Platforms' - it talks about low level hooks to achive the goal. If you find an easier / better way please post a reply here for the rest of us!

Dylan Kenneally
London, UK

Visual .NET Debugger on 6.0 C++ compiler

8-Jul-02 1:36

Hi there,
Just back from Barcelona for Tech-Ed 2002, and I saw in same presentations
that it was possible to use the new debugger shipped with Visual c++ with
the 6.0 compiler:

The question is:

1. How to do it?
2. I can still use after on the same machine
the debugger .NET with compiler 7.0 (Unmanaged C++)

Thanks, claudio

Override CArchive::IsStoring()==FALSE ?

Koep8-Jul-02 1:05

Koep

8-Jul-02 1:05

Hello,

i want to change the buffer contents of the CArchive or of the attached
CFile Object. But it is not allowed to make a write access in the "loading path" of serialization. I don't want to override the CArchive class.

Any solutions ?

Thanxs !

Marco

SetWindowPos Problem

AJ1238-Jul-02 0:39

AJ123

8-Jul-02 0:39

I have positioned an ActiveX control onto a tabsheet control. I now want the ActiveX control to resize with the window. For some reason i don't get the desired result, can nayone see where i am slipping up.

Thanks
Richard

Code Fragment:

Init Dialog - Creation of the ActiveX Control

m_tabSheet.GetWindowRect( &rc );
ScreenToClient( &rc );

rc.top += 30;
rc.bottom -=90;
rc.left += 5;
rc.right -= 40;

m_controlWrapper1.Create(m_hWnd,rc, _T("MSCAL.Calendar"), WS_CHILD, ....)

Resize Event
=============
RECT tabRC;

m_tabSheet.GetClientRect(&tabRC);

ScreenToClient( &tabRC );
tabRC.top += 30;
tabRC.bottom -=90;
tabRC.left += 5;
tabRC.right -= 40;

m_controlWrapper1.SetWindowPos(CWnd::wndTop, tabRC.left, tabRC.top,tabRC.right - tabRC.left, tabRC.bottom - tabRC.top,SWP_SHOWWINDOW);

Re: SetWindowPos Problem

Elrond8-Jul-02 4:53

Elrond

8-Jul-02 4:53

One thing is that I think you'd better use the MoveWindow function instead of the SetWindowPos function in that case.

Have you checked the the coordinate don't reach something like a bottom higher than a top...

Computers have enabled people to make more mistakes faster than almost any invention in history, with the possible exception of tequila and hand guns.
- Carl Gundlach

Task Bar in Full Screen Mode Implementation

nilaysoft8-Jul-02 0:18

nilaysoft

8-Jul-02 0:18

I want implement full screen mode in my small application. I wrote codes
as follows:

cx = //width of the screen;
cy = //height of the screen;
SetWindowPos (hwnd, NULL, -4, -4, cx, cy, SWP_NOZORDER | SWP_FRAMECHANGED);

They work pretty well, the minor boring thing is that the task bar (if Not
autohide) is still there. it will not disappear unless I click it once? any
solution? thanks, thanks.

http://ihome.ust.hk/~zhaoming

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