C / C++ / MFC Discussion Boards

Sonix28-Mar-05 23:11

28-Mar-05 23:11

Hi,
Can anyone give me advice on how to pass a progress bar control to my dll?

In my dll I have the following test function:
extern "C" __declspec(dllexport) void MoveBar(CProgressCtrl *ProgBar)

and in my app I can successfully load the dll and call the function passing the &m_ProgressBar in the calling routine.

The trouble is when I use the following code in my dll:
ProgBar->SetPos(50);

My app crashes with the following error:
Debug Assertion Failed!
...
File afxcmn2.inl
Line:288

Now, I'm obviously doing something wrong but I can't figure out what D'Oh! | :doh:

Any help please? Sigh | :sigh:

Re: Passing a Dialog Control to dll??

Michael Dunn28-Mar-05 23:44

Michael Dunn

28-Mar-05 23:44

A failed assert is not a crash, it's telling you that you called something incorrectly. What is being tested in line 288 of afxcmn2.inl?

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD

Re: Passing a Dialog Control to dll??

Sonix28-Mar-05 23:47

Sonix

28-Mar-05 23:47

[Line 287]_AFXCMN_INLINE int CProgressCtrl::SetPos(int nPos)
[Line 288]{ ASSERT(::IsWindow(m_hWnd)); return (int) ::SendMessage(m_hWnd, PBM_SETPOS, nPos, 0L); }

Re: Passing a Dialog Control to dll??

Blake Miller29-Mar-05 5:38

Blake Miller

29-Mar-05 5:38

Is your progrma AND your DLL built to use the MFC DLL the same way? Like both are built using the SHARED MFC DLL? If not, make them match and try again.

Otherwise, you will have to change your DLL function to acept the HWND of the progress bar and set the position manually. You can avoid passing the MFC control pointers across the DLL boundary altogether.

The progress bar position can be set using the HWND like this:
::SendMessage(hProgressBarWindow, PBM_SETPOS, nPos, 0L);

Sometimes MFC does not share the MFC 'CWnd*' map tables across the DLL boundaries. So passing the 'pointer' to some CWnd derived class across the DLL results in an invalid window handle or invalid window class pointer. You can experience the same thing within a single EXE if you have multiple threads running too.

data transfer across 2 console applications

vikramlinux28-Mar-05 23:08

vikramlinux

28-Mar-05 23:08

Hie,
I have 2 console processes which dont have message loops. I want to transfer data across them.How to do that?

Re: data transfer across 2 console applications

Alexander ^M.,29-Mar-05 2:48

Alexander ^M.,

29-Mar-05 2:48

Network sockets or named pipes could help.

Don't try it, just do it! Wink | ;-)

Re: data transfer across 2 console applications

Blake Miller29-Mar-05 5:40

Blake Miller

29-Mar-05 5:40

Or you can try memory mapped files or make them use local RPC.
There are examples here on CodeProject how to do this.

Symmetric matrix

khyap28-Mar-05 22:53

khyap

28-Mar-05 22:53

Need help!!

can i know how to write a program about symmetric matrix based on Aij = Aji ??

thank you!! Big Grin | :-D

Re: Symmetric matrix

namaskaaram29-Mar-05 0:35

namaskaaram

29-Mar-05 0:35

u already have!!!!!.....us the condition u have spoecified and based on that wriet the program!!!!.....dont tell me......
thiz is an assignment!

"faith, hope, love remain, these three.....; but the greatest of these is love" -1 Corinthians 13:13

Re: Symmetric matrix

namaskaaram29-Mar-05 0:35

namaskaaram

29-Mar-05 0:35

u already have!!!!!.....use the condition u have spoecified and based on that wriet the program!!!!.....dont tell me......
thiz is an assignment!

"faith, hope, love remain, these three.....; but the greatest of these is love" -1 Corinthians 13:13

Controlling Stop Bit

Logan from Singapore28-Mar-05 22:16

Logan from Singapore

28-Mar-05 22:16

Hi,

I am currently working on a project that will require me to set one of the stop bit. My com setting will be set to 2 stop bits. But I would like to set one of the stop bit to '1' or '0'.

How can I go about doing this?

Re: Controlling Stop Bit

Mike Dimmick29-Mar-05 1:13

Mike Dimmick

29-Mar-05 1:13

You can't. The hardware is not capable of doing this. The purpose of the start and stop bits is to allow the receiving hardware to synchronise with the transmitter.

I suggest you read this Serial and UART tutorial[^].

Stability. What an interesting concept. -- Chris Maunder

Win32 API: Shutdown a remote PC

shaiba28-Mar-05 22:13

shaiba

28-Mar-05 22:13

hi there

well i have come across many Sharewares, that allow admins to shutdown their clients

HOW DO THEY DO THAT? perhaps its some knowledge related to admin previliges that i dont know..... and is it that they use RPC or what ........
please someone throw light on this.

thanx

Re: Win32 API: Shutdown a remote PC

ThatsAlok28-Mar-05 22:28

ThatsAlok

28-Mar-05 22:28

I never used that but InitiateSystemShutdown(...) api may help!!!

[Vote One Here, Complete my Survey....]

Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

Re: Win32 API: Shutdown a remote PC

shaiba28-Mar-05 23:31

shaiba

28-Mar-05 23:31

no actually I was not looking for the API, I was rather interested in the previleges and networking involved.
U see, these sharewares dont require any kind of installation or configuration on the clients.

Re: Win32 API: Shutdown a remote PC

ThatsAlok29-Mar-05 0:06

ThatsAlok

29-Mar-05 0:06

Please Read documentation of the InitiateSystemShutdown(...). MS have shown way to get there! where you want to be!!!

[Vote One Here, Complete my Survey....]

Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

Get window type?

Dominik Reichl28-Mar-05 22:09

Dominik Reichl

28-Mar-05 22:09

Hello!

I am translating dialogs by calling EnumChildWindows in the dialog class. Windows then calls my translation callback function for all child windows, which looks like this:

BOOL CALLBACK TranslateWindowCallback(HWND hwnd, LPARAM lParam)
{
	TCHAR sz[1024];
	GetWindowText(hwnd, sz, 1023);
	SetWindowText(hwnd, TRANSLATE_FN(sz));
	return TRUE;
}

This works pretty fine, but unfortunately it also translates edit controls and rich edit controls. I don't want this. It should translate only buttons, checkboxes, radioboxes, static texts, ...

How can I get the type of a window using only the HWND?

Thanks and best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Get window type?

ThatsAlok28-Mar-05 22:23

ThatsAlok

28-Mar-05 22:23

Check for GetWindowInfo(...) api as one of its argument return with class information of window i.e. WINDOWINFO::atomWindowType, which on using with GetClassInfo(...) api, you will come to know class name of window and As BUTTON, CHECKBOX has predefined classes, So I believe it very easy for you to differentiate it with rest of windows.

[Vote One Here, Complete my Survey....]

Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

Re: Get window type?

Dominik Reichl28-Mar-05 22:34

Dominik Reichl

28-Mar-05 22:34

My VC++ 6.0 doesn't know WINDOWINFO and GetWindowInfo Unsure | :~

Any other method?

Best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Get window type?

ThatsAlok28-Mar-05 22:46

ThatsAlok

28-Mar-05 22:46

include thi sline in your stdafx.h

#define _WIN32_WINNT   0x0501
#define WINVER         0x0501

to use that functions

[Vote One Here, Complete my Survey....]

Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

Re: Get window type?

Dominik Reichl28-Mar-05 23:50

Dominik Reichl

28-Mar-05 23:50

I've searched around a bit for window class names and found the function GetClassName. This function seems to get the class name directly (your function doesn't do anything other, or?). Any reason not to use this function?

Thanks for your replies and best regards
Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??
(doesn't work on NT)

Re: Get window type?

ThatsAlok29-Mar-05 0:04

ThatsAlok

29-Mar-05 0:04

Ohh I missed that API!! Big Grin | :-D

[Vote One Here, Complete my Survey....]

Alok Gupta
visit me at http://www.thisisalok.tk

"I ~~Think~~ Believe this Will Help"

Re: Get window type?

Michael Dunn28-Mar-05 23:48

Michael Dunn

28-Mar-05 23:48

GetClassInfo() will get you the class name in one call.

--Mike--
LINKS~! Ericahist | 1ClickPicGrabber | CP SearchBar v2.0.2 | C++ Forum FAQ
Strange things are afoot at the U+004B U+20DD

File I/O

Anonymous28-Mar-05 21:48

Anonymous

28-Mar-05 21:48

Hello!! Me again!

I want to ask who got a example of how to write a void member function data (integer) into disk file or write a group of integer into disk file ??

thank you!!

Confused | :confused:

Re: File I/O

David Crow29-Mar-05 4:51

David Crow

29-Mar-05 4:51

Anonymous wrote:
...who got a example of how to write a void member function data (integer) into disk file...

Not sure what you mean by this.

Anonymous wrote:
...write a group of integer into disk file ??

Easy enough:

CFile file(...);
for (int x = 0; x < 10; x++)
    file.Write(&x, sizeof(int));
file.Close();

CStdioFile file(...);
for (int x = 0; x < 10; x++)
{
    CString str;
    str.Format("%d\n", x); // this puts each one on a separate 'line'
    file.WriteString(str);
}
file.Close();

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

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