C / C++ / MFC Discussion Boards

DarrollWalsh10-Oct-02 21:55

10-Oct-02 21:55

From what I know about dlls is: If my functions aren't in the def file, I cannot get a pointer to the functoins. Do you not need it in an exe? Also, will I need to export the entire class? If anyone has done this and would care to share please do.

Darroll

Not one person lives in the present. Only the past. I can prove it.

Re: Export functions in an exe

Rickard Andersson²⁰10-Oct-02 22:35

Rickard Andersson²⁰

10-Oct-02 22:35

Darroll wrote:
From what I know about dlls is: If my functions aren't in the def file

You could be right!
I haven't tried exporting functions from an exe yet! Unsure | :~

<Rickard is hiding him self />

Darroll wrote:
Also, will I need to export the entire class?

You can't export member functions of an class.
You'll need to make them static if so... I hope...

PS. This is my message number 700!!!!! Nish, I get closer to you!! Big Grin | :-D

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Export functions in an exe

Joel Lucsy11-Oct-02 3:52

Joel Lucsy

11-Oct-02 3:52

try something like
class __declspec(dllexport) ABCD
{
public:
void junk(){}
}

and if you have a simple function:
int _declspec(dllexport) myfunction();

and variables:
int _declspec(dllexport) myvariable;

Joel Lucsy (jjlucsy@concentric.net)

Re: Export functions in an exe

Stephane Rodriguez.10-Oct-02 23:25

Stephane Rodriguez.

10-Oct-02 23:25

¿De qué se ríe un tonto? De ver reír a otro tonto.

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: Export functions in an exe

DarrollWalsh10-Oct-02 23:30

DarrollWalsh

10-Oct-02 23:30

__Stephane Rodriguez__ wrote:
¿De qué se ríe un tonto? De ver reír a otro tonto.

Can someone translate this to English?

Did you just call me an idiot?

Darroll

Not one person lives in the present. Only the past. I can prove it.

Re: Export functions in an exe

Stephane Rodriguez.10-Oct-02 23:32

Stephane Rodriguez.

10-Oct-02 23:32

Ok, too bad you don't guess it. I am saying the discussion you and Rickard are having is making my day. Thanks a lot.

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: Export functions in an exe

DarrollWalsh10-Oct-02 23:40

DarrollWalsh

10-Oct-02 23:40

Glad we could make you laugh.

Darroll

Not one person lives in the present. Only the past. I can prove it.

Re: Export functions in an exe

Rickard Andersson²⁰10-Oct-02 23:51

Rickard Andersson²⁰

10-Oct-02 23:51

I would be glad if someone could try export a function and tell me if it worked for you!

Cheers!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Export functions in an exe

Stephane Rodriguez.11-Oct-02 0:16

Stephane Rodriguez.

11-Oct-02 0:16

A .def file only eliminates the need to add __declspec(dllexport) attributes alongside with each function you export.

Exporting functions does not work for an exe : there is no __declspec(process) attribute. Attempting to export a .exe function using dllexport will just prompt the loading of the .dll file, which does not exist!

Export interfaces instead. That's what COM is about.

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: Export functions in an exe

Simon Steele11-Oct-02 0:50

Simon Steele

11-Oct-02 0:50

Interesting! I used to export functions from my Delphi .exe files but had no idea that I couldn't do it in C++ - I would have had to discover that at somepoint and no doubt tear some hair out in the process. I'll have to go back to having a separate DLL to export the functions. Shame.

--
Simon Steele
Programmers Notepad - http://www.pnotepad.org/

Re: Export functions in an exe

Simon Steele11-Oct-02 1:17

Simon Steele

11-Oct-02 1:17

In fact, I have just exported some functions from a .exe in Visual C++ and used them from a DLL! I defined them in a .def file in the .exe project and then used GetProcAddress to import them in the .dll (obviously giving the DLL function the HMODULE of my running .exe). I can send anyone who's interested the project files.

--
Simon Steele
Programmers Notepad - http://www.pnotepad.org/

Re: Export functions in an exe

Rickard Andersson²⁰11-Oct-02 1:52

Rickard Andersson²⁰

11-Oct-02 1:52

Simon Steele wrote:
I have just exported some functions from a .exe in Visual C++ and used them from a DLL!

Lopok everyone!
I told ya it was possible!

Rickard Andersson@Suza Computing
C# and C++ programmer from SWEDEN!
UIN: 50302279
E-Mail: nikado@pc.nu
Speciality: I love C#, ASP.NET and C++!

Re: Export functions in an exe

DarrollWalsh11-Oct-02 1:59

DarrollWalsh

11-Oct-02 1:59

Simon Steele wrote:
I can send anyone who's interested the project files.

Send me the project please.

Darroll

Not one person lives in the present. Only the past. I can prove it.

Re: Export functions in an exe

Paul M Watt11-Oct-02 6:01

Paul M Watt

11-Oct-02 6:01

If you view depends on Excel you can see that Excel exports functions.

Both Exes and DLLs are written in the PE format. The only difference between them is their entry point that either makes them standalone execuatable or not.

So you will be able to load and EXE and map function addresses in that EXE at runtime just like it was a DLL.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: Export functions in an exe

Stephane Rodriguez.11-Oct-02 6:30

Stephane Rodriguez.

11-Oct-02 6:30

Paul Watt (kilowatt) wrote:
So you will be able to load and EXE and map function addresses in that EXE at runtime just like it was a DLL.

Faking the OS by using an EXE as if it was a DLL leads you to unexpected problems. Allright, the vtable is exported and reflected by quickview or other PE viewers. Allright, you may even call a method on it. And if you are lucky, this will even work.
Indeed, The process boundary and load context enabled by a standard exe launch is totally different than with a DLL (loaded in the same address space). In other words, the DLL has no context at all.
You'll meet soon a guy called time chkesp.c complaining about such a use.
In addition, the executable must be designed to be able to respond to your calls. Don't forget that once a process is launched, it is doing something, and is not necessarily able to respond outside calls. That's one of the benefits of using COM instead.
The process life cycle raises a bunch of other troubles, but I let you discover them.

Good luck!

She's so dirty, she threw a boomerang and it wouldn't even come back.

Re: Export functions in an exe

Gary R. Wheeler11-Oct-02 16:34

Gary R. Wheeler

11-Oct-02 16:34

You are a lot better off making your EXE a local COM server, than trying to call in to it as if it were a DLL. COM handles all of the process/context issues for you, and you don't have to worry about calling differences between DLL's, and all that stuff.

By the way: it's easy to make an existing application act as a COM server as well as continue its normal activity.

Gary R. Wheeler

How to capture a frame from avi correctly?

csqlhy10-Oct-02 20:25

csqlhy

10-Oct-02 20:25

I use AVIStreamGetFrame() to get the frame data, then use
the data to write an BMP file, but i find the BMP file is
not correct, PLS refers to the attached file, you can see
the file, the circle is split, but in fact the circle is
not split and should in the center. But i use DrawDibDraw
to write the frame to screen, the result is right.
I do not know why, PLS help me.
Welcome any suggestion.

PS:
PAVISTREAM m_pVideoStreams [MAX_VIDEO_STREAMS];
AVISTREAMINFO avis;
LONG lEnd, lEndTime, l;
LONG lPos;
BYTE m_byteFormat [1024];
AVIStreamInfo(m_pVideoStreams[i], &avis, sizeof
(AVISTREAMINFO));
FIXCC(avis.fccHandler);
FIXCC(avis.fccType);
l = sizeof(m_byteFormat);
AVIStreamReadFormat(m_pVideoStreams[i],0, &m_byteFormat,
&l);
lPos = AVIStreamTimeToSample(m_pVideoStreams[i], lTime);
AVIStreamSampleSize(m_pVideoStreams[i], lPos, &lSize);
lpbi = (LPBITMAPINFOHEADER)m_byteFormat;
FIXCC(lpbi->biCompression);
// Which frame belongs at this time?
lEndTime = AVIStreamEndTime(m_pVideoStreams[i]);
if (lTime <= lEndTime)
lFrame = AVIStreamTimeToSample(m_pVideoStreams[i],
lTime);
else
{ // we've scrolled past the end of this stream
lEnd = AVIStreamEnd(m_pVideoStreams[i]);
lFrame = lEnd + AVIStreamTimeToSample
(m_pVideoStreams[i], lTime - lEndTime);
}
lpbi = (LPBITMAPINFOHEADER)AVIStreamGetFrame(m_pVideoPGF
[i], m_lFrame);

//then accordint to the lpbi to draw in the screen and
write to an BMP file

Dialog Box focus

ShahShehpuri10-Oct-02 19:59

ShahShehpuri

10-Oct-02 19:59

Suppose many windows are open on your desktop. As such only one window is active which is in the front and has the current input focus. I call it active window while the others as inactive windows. Right !!!!

I want to create simple dialog box application. But i want my dialog box to appear as an "inactive" form, i.e when i run my application from Visual Studio, the dialog box appears in the back of Visual Studio Window and Visual studio Window not lose its focus. How can i do so ???

Re: Dialog Box focus

alex.barylski10-Oct-02 20:09

alex.barylski

10-Oct-02 20:09

ShahShehpuri wrote:
Suppose many windows are open on your desktop. As such only one window is active which is in the front and has the current input focus. I call it active window while the others as inactive windows. Right !!!!

AFAIK

ShahShehpuri wrote:
How can i do so ???

ShowWindow(SW_SHOWNA)

"MSDN: SW_SHOWNA Displays the window in its current state. The window that is currently active remains active"

HTH

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Dialog Box focus

ShahShehpori10-Oct-02 20:38

ShahShehpori

10-Oct-02 20:38

Hockey wrote:
ShowWindow(SW_SHOWNA)

But at which place in dialog Application, i use this function ??? I used it in OnInitDialog(), but it didn't worked ???

Handle vs Pointer

stevenson10-Oct-02 17:24

stevenson

10-Oct-02 17:24

Hi,
I got a handle to a window, and want got a pointer to the windows object for further manipulation, how to do then? Example is welcomed.
Thanks

Extreme programming. Do the No.1

Re: Handle vs Pointer

C^hris L^osinger10-Oct-02 17:49

C^hris L^osinger

10-Oct-02 17:49

you mean you want a CWnd from an HWND ? CWnd::Attach and CWnd::FromHandle might help.

-c

Support regime change. Vote.

Etch-a-sketch!

Re: Handle vs Pointer

stevenson10-Oct-02 18:18

stevenson

10-Oct-02 18:18

and how to use them, show me an example, plz.

Extreme programming. Do the No.1

Re: Handle vs Pointer

stevenson10-Oct-02 18:24

stevenson

10-Oct-02 18:24

Look the code, it doesn't work

<br />
int CALLBACK MonitorCallback(HGLOBAL hBuf, int nLen, LPARAM lParam)<br />
{<br />
   LPBYTE lpBuf = (LPBYTE)::GlobalLock((HGLOBAL)hBuf);<br />
   if(!lpBuf)<br />
	return 1;<br />
<br />
   CString str=HexDump(lpBuf,nLen);<br />
   CEdit Edit;<br />
 <br />
   Edit.Attach((HWND)lParam);<br />
   CEdit *pEdit=(CEdit*)Edit.FromHandle((HWND)lParam);<br />
   pEdit->SetWindowText(str);<br />
   <br />
   return 0;<br />
 <br />
}

what's wrong???

Thanks in advance

Extreme programming. Do the No.1

Re: Handle vs Pointer

Nish Nishant10-Oct-02 20:00

Nish Nishant

10-Oct-02 20:00

You have attached the HWND to the CEdit, so why do you then use FromHandle?

Edit.Attach(...)
Edit.SetWindowText(...)
Edit.Detach(...)

I think this should do it.

Regards,
Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

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