C / C++ / MFC Discussion Boards

happycpp18-Aug-04 1:50

18-Aug-04 1:50

hello everyone..
this is my first post in this forum and actually it's a question about DLL's:
I made a *.cpp file with the following

#include <afx.h><br />
#include <Mmsystem.h><br />
<br />
LPCSTR _stdcall OpenSound (LPCSTR lpfile){<br />
	CString str = lpfile;<br />
	MCIERROR dwRet;<br />
<br />
	str = "open \"" + str + "\" alias jack";<br />
	<br />
	dwRet = mciSendString(str,NULL,0,NULL);<br />
	if (dwRet)<br />
		MessageBox(NULL,"Fail to open","Hello!",0);<br />
	else<br />
		if (mciSendString("close all",NULL,0,NULL))<br />
			MessageBox(NULL,"Fail to close","Hello!",0);<br />
			<br />
<br />
	//MessageBox(NULL,(LPCSTR)str,"Hello!",0);<br />
	return lpfile;<br />
}

and ofcourse I made a *.def file for it..
the problem is that the final DLL is TOO big ((80.0 kb in Release and 1.23 mb in Debug))
I made a dll in vb which contains a lot of functions and the size of it was about 60.0 kb..
so is there a way to minimize the DLL made by c++..

Re: Problem:big dll size

Michael P Butler18-Aug-04 1:56

Michael P Butler

18-Aug-04 1:56

80kb doesn't sound too large to me.

What version of CString are you using?

Is it the MFC or ATL version? Are you statically linking or dynaminc link ATL/MFC

What kind of compiler optimisation settings are you using?

Michael

CP Blog [^]

Re: Problem:big dll size

happycpp18-Aug-04 4:16

happycpp

18-Aug-04 4:16

I'm using the MFC and I don't know how to know if it's statically or dynamically!!
also I don't know about the optimisation thing..
actually I'm a very newb to these stuff..

Re: Problem:big dll size

David Crow18-Aug-04 6:22

David Crow

18-Aug-04 6:22

This is a very common misconception among new Windows programmers. I suggest you read these three articles:

http://www.flounder.com/howbig.htm
http://msdn.microsoft.com/msdnmag/issues/01/01/hood/
http://www.microsoft.com/msj/archive/S569.aspx

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

Re: Problem:big dll size

gamitech19-Aug-04 12:42

gamitech

19-Aug-04 12:42

too big for what man
?

gabby

insert branch parameter in Microsoft RTC Client API 1.2

elza18-Aug-04 1:40

elza

18-Aug-04 1:40

Any idea how to include the branch parameter in via header for a REGISTER/ INVITE message. I am using Microsoft RTC 1.2 Client API calls.

I tried passing a XML file which acts upon the entered User account, Password, SIP URI, Server Address etc.. I don't know how to enter the branch parameter for via header which is a required field . It look slike as shown below...

Via: SIP/2.0/UDP 10.20.30.40:5060;branch=z9hG4bKDB2DC20E6BEB4E0FB3C0F299D0F3114D

Re: insert branch parameter in Microsoft RTC Client API 1.2

Hasini Gunasinghe14-Jan-09 21:34

Hasini Gunasinghe

14-Jan-09 21:34

Hi,

I have the same problem.If you got to know the way to do it, please do reply.

Thank you.

regards,
Hasini.

How to add text in video capture

zahid_ash18-Aug-04 1:25

zahid_ash

18-Aug-04 1:25

HI ,

Usinf DirectX and VC++ , how can i add text in video. means when i captured it ,, that text it also in that captured(saved on disk ) video.

thanx

Regards.

HI , Problm in Drag and Drop ,,,, DragQuryFile

zahid_ash18-Aug-04 0:15

zahid_ash

18-Aug-04 0:15

My code is as follows
May be i have mistake in it.
str gives nothing;

void CCloseDlg::OnDropFiles(HDROP hDropInfo)
{
AfxMessageBox ("Darg n drop");
LPTSTR str;
UINT n;
DragQueryFile( hDropInfo, 0xffffffff , str, n);

AfxMessageBox(str);
CDialog::OnDropFiles(hDropInfo);
}

plz make correction... i want to get whole path and file name
thanx

Regards.

Regards.

Re: HI , Problm in Drag and Drop ,,,, DragQuryFile

Niklas L18-Aug-04 1:42

Niklas L

18-Aug-04 1:42

You have to allocate the buffer for the return value, and also use a correct file index:

TCHAR str[MAX_PATH];
UINT n = MAX_PATH;
UINT nFileCount = DragQueryFile( hDropInfo, 0xffffffff , str, n);
for (int fileIndex = 0; fileIndex < nFileCount; ++fileIndex)
{
DragQueryFile( hDropInfo, fileIndex , str, n);
AfxMessageBox(str);
}

Re: HI , Problm in Drag and Drop ,,,, DragQuryFile

jmkhael18-Aug-04 1:45

jmkhael

18-Aug-04 1:45

Indeed you have errors

MSDN:
lpszFile
Address of a buffer to receive the file name of a dropped file when the function returns. This file name is a null-terminated string. If this parameter is NULL, DragQueryFile returns the required size, in characters, of the buffer.

You dont have a buffer, u just have an address

Anyway check this class[^]

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: HI , Problm in Drag and Drop ,,,, DragQuryFile

David Crow18-Aug-04 6:24

David Crow

18-Aug-04 6:24

See here.

"When I was born I was so surprised that I didn't talk for a year and a half." - Gracie Allen

how to get the addresses of data_segs

FajoK18-Aug-04 0:08

FajoK

18-Aug-04 0:08

I need to group variables into different segments.
At runtime I have to get the absolute start-adresses and sizes of the sections (in dll and/or exe).

I know using dumbbin.exe (and the map-file) will give me some information.

keywords: data_seg, bss_seg, dumbbin

using externally defined function pointers

erkanina17-Aug-04 23:47

erkanina

17-Aug-04 23:47

Dear Programmers,

I am working on an MFC/Dialog based project. I defined a function pointer in a class's header file as a static like below;

...
typedef BOOL (WINAPI *blTagHCWDOGEnable)(DWORD IN_dwSecTime);
static blTagHCWDOGEnable blHCWDOGEnable;
...

Then I initialised this function pointer from a dll with ordinary function (LoadLibrary(...) , GetProcAddress(...))

Everything is working OK in this class. I am able to use this function but when I try to use this function from another class I am encountering errors. As if something modifying content of function pointer and it is equaling to NULL.
What may cause this?

Thanks and best regards

Re: using externally defined function pointers

Ryan Binns17-Aug-04 23:58

Ryan Binns

17-Aug-04 23:58

Erkan Ermis wrote:
What may cause this?

The static keyword. Each file that uses your header file will get its own copy of the variable, so if you set it from one file, other files won't see the change.

Change static to extern and define the variable in one of the .cpp files without the extern keyword. That should help it to work.

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"

Re: using externally defined function pointers

erkanina18-Aug-04 0:27

erkanina

18-Aug-04 0:27

I have not applied yet but I am sure it will work.
Thanks for your clear explanation.

Re: using externally defined function pointers

gamitech19-Aug-04 12:51

gamitech

19-Aug-04 12:51

or you can use

typedef VOID (CALLBACK* PROCEDURE)(VOID);//or any parameter
PROCEDURE procedure;

dllhinst=LoadLibrary("x");

if (dllhinst!=NULL)
{
procedure=(PROCEDURE)GetProcAddress(dllhinst, "Function");
}
I can assure this will work very well

gabby

C2642 error

Just_a_Learner17-Aug-04 23:16

Just_a_Learner

17-Aug-04 23:16

Hi, I am in the early stages of generating an app that runs from the system tray icon (never used this before). However, I am getting a compile error on the message map entry for WM_TRAY_MESSAGE (which is #defined earlier as WM_USER+1) :-

IMPLEMENT_DYNCREATE(CReminderView, CView)
BEGIN_MESSAGE_MAP(CReminderView, CView)
//{{AFX_MSG_MAP(CReminderView)
ON_MESSAGE(WM_TRAY_MESSAGE ,OnTrayNotify)
//}}AFX_MSG_MAP
// Standard printing commands
ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

The mapped function (in this class) is:-
afx_msg void CReminderView::OnTrayNotify(WPARAM wParam, LPARAM lParam)
{
....
}

The error I get is :-
error C2642: cast to pointer to member must be from related pointer to member

I don't understand the relevence of this error to the statement ON_MESSAGE(WM_TRAY_MESSAGE ,OnTrayNotify)
as the first parameter is a constant and the second is to a pointer to function contained
within this class. Where is the cast ?

Can someone get me back on the "straight and narrow" please ? (knowing me, it's probably something REALLY simple, but I can't see it !)

"Bewildered !""

Re: C2642 error

Ryan Binns18-Aug-04 0:05

Ryan Binns

18-Aug-04 0:05

The problem is that messages handled with ON_MESSAGE() (including OnTrayNotify()) must return an LRESULT, not void. The cast is inside the ON_MESSAGE() macro. Look in the source for the macro to see how it works.

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"

Re: C2642 error

Just_a_Learner18-Aug-04 7:11

Just_a_Learner

18-Aug-04 7:11

O.K. - got it sorted !! Thanks for the help Ryan Smile | :)

"Bewildered"

Dialogue container

mansour_ahmadian17-Aug-04 22:44

mansour_ahmadian

17-Aug-04 22:44

Hello,
I need to design a dialogue that its shape is changed with the user interface. It is very similar to a tabbed dialogue box but the active propertysheet would be selected by the selection on a tree control. I remember from old times that VB has a container control that I can put several control on it and then when I set the visibility of the container to true, all of my control on that specific container become visible and vice versa. Is there any way that I can do this in VC6? I tried to do this by using CPropertySheet without any success. Any help of code sample appreciated.

Best regards
Dialogue container

RasEnumConnections Problem

Muhammad Asif Khan17-Aug-04 21:27

Muhammad Asif Khan

17-Aug-04 21:27

I am using RasEnumConnections function of SDK to get list of active DUN connections. Its working fine under WINXP but under WIN2K it gives error code 632 or 0x278 which is ERROR_INVALID_EA_HANDLE. Can you tell me whats wrong with that. Same application is running on both OS. I have Plateform SDK 2001 installed and SP4 for WIN2K and SP1 for WINXP installed on my machines. I have used the sample sinppet given in MSDN.

Thanx in advance

Asif

Re: RasEnumConnections Problem

Antti Keskinen18-Aug-04 1:24

Antti Keskinen

18-Aug-04 1:24

This error might be caused by the RASCONN structure that you pass to the function.

According to the MSDN documentation, the RASCONN structure has a few extra members (dwFlags and luid) under Windows XP. These members are not supported in Windows 2000 environment. I presume that you are building the application on a Windows XP platform, and as such, the structure gets initialized to support all the features in Windows XP. It compiles under Windows XP properly, but will not run on Windows 2000.

In order to fix this, you need to go to your project's settings and into the compiler settings. In there, add an extra predefinition. For a list of definitions to use when specifying the minimum platform, see this[^] list in MSDN.

To support Windows 2000, you must define WINVER to 0x0500. Now when you compile your code, it produces an executable that runs on Windows 2000 and above.

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

How to write algorithms of WIN32 API.?

Rajesh_K_Sharma17-Aug-04 19:54

Rajesh_K_Sharma

17-Aug-04 19:54

Hi
I would like to write of algorithms WIN32 API.So that , I can understand easily.
Please give me an example of WIN API with algorithms.
Is it possible easy way to write algorithms.?
Please guide me and suggest me which book is useful for this.

Any help appreciated.

Best Regards.
Rajesh

rajesh

Re: How to write algorithms of WIN32 API.?

Antti Keskinen18-Aug-04 1:09

Antti Keskinen

18-Aug-04 1:09

Hmm..

I don't quite understand your question. An algorithm is a set of predefined instructions that solve a specific problem or a problem of specific type. For example, solving an equation can be called an algorithm.

Win32 API, on the other hand, is used to program Microsoft Windows(r) environment, allowing the creating of Windows-compatible software. It has nothing to do with algorithms.

Could be a bit more specific about your problem. What is it that you are needed to do ? Write an algorithm to do something ? Write a Windows-application that does something ?

-Antti Keskinen

----------------------------------------------
The definition of impossible is strictly dependant
on what we think is possible.

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