C / C++ / MFC Discussion Boards

tulc_kris12-Aug-02 21:57

12-Aug-02 21:57

Hi Can someone explain PeekAndPump() function and why should we use it with a ProgressBar??
Is there a standard definition for this function???
Blush | :O

Re: what is PeekAndPump()??

jmkhael12-Aug-02 23:27

jmkhael

12-Aug-02 23:27

Good link http://www.codeguru.com/controls/progress_wnd.shtml

Papa
Murex Co.

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: what is PeekAndPump()??

Tomasz Sowinski13-Aug-02 0:44

Tomasz Sowinski

13-Aug-02 0:44

The PeekAndPump function you're referring to is probably part of some example. There's no API or MFC function with this name.

Name of this function suggests that there's a loop inside which checks for messages with PeekMessage - hence the 'peek' part. If there's any message, it's dispatched to appropriate window; this is the reason for 'pump'. The peek'n'pump solution is needed because there's some activity going on and progress bar shows the progress of operation.

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

What is "scratch" and why can everything be made from it?

Thread and serial port

Mavrock12-Aug-02 19:25

Mavrock

12-Aug-02 19:25

I am new to programming. I have been given the task of making an application that recieves commands via the serial port. and then displays a notification that the commands were recieved. I have been told that I need to use a thread to do this. I'm not sure where the thread goes, I.E does it go in the source file or the header file? Or do I declare it in the header file and then put the functionality in the OnInitialDialog function?
Thank you for any help.
Mavrock

Re: Thread and serial port

Trollslayer12-Aug-02 22:17

Trollslayer

12-Aug-02 22:17

Mavrock,
I have done something similar but nowhere near doing an article yet.
Basically:
1. Create a dialogue box
2. Insert the Mircosoft communications ActiveX component into it.
3. Create a variable name for the ActiveX component. This then creates a class for the MSCOMM component (prompt displayed).
4. Set the RThreshold property to 1. This causes an OnCommEvent for every character received.
5. In the OnCommEvent() procedure, event 2 is for soemthing received.

If you want a small sample project let me have your email address and I'll forward it.
I have used this on Win98 and NT4 with no problems.

Elaine (fluffy tigress emoticon)

Would you like to meet my teddy bear ?

Re: Thread and serial port

Mavrock13-Aug-02 6:24

Mavrock

13-Aug-02 6:24

Dear Elaine,

Thank you for the direction. If you don't mind I would really like to see your sample project. You can send it to me at stonematthies@hotmail.com.
thanks. Mavrock

Re: Thread and serial port

dlhson13-Aug-02 6:45

dlhson

13-Aug-02 6:45

On this site codeproject.com and on codeguru.com, you can find many articles about your topic

Hung Son
A Vietnamese student
i-g.hypermart.net
dlhson2001@yahoo.com

Other question about Carlos Antollini ADO classes !!!

Hadi Rezaee12-Aug-02 19:13

Hadi Rezaee

12-Aug-02 19:13

Hi there,
I just wanted to add new records to end of record list like this:

Gen
Brus Lee
Arnold
Hadi Poke tongue | ;-P

and etc.

I wrote it:

m_rs.AddNew();
m_rs.SetFieldValue("NAME", "Gen");
m_rs.SetFieldValue("NAME", "Brus Lee");
m_rs.SetFieldValue("NAME", "Arnold");
m_rs.SetFieldValue("NAME", "Hadi");
m_rs.Update();

But when i run this code, the result is strange ...
the result is it:

Hadi
Arnold
Brus Lee
Gen

OMG | :OMG:

vice versa ???
But why ?

What's my wrong ?

Help me please !

Regards,

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Re: Other question about Carlos Antollini ADO classes !!!

C^hris L^osinger12-Aug-02 19:22

C^hris L^osinger

12-Aug-02 19:22

why don't you ask this on Carlos's article ?

Conservative:
One who admires radicals centuries after they're dead.
-- Leo C. Rosten

image effects!

Re: Other question about Carlos Antollini ADO classes !!!

Hadi Rezaee12-Aug-02 19:31

Hadi Rezaee

12-Aug-02 19:31

Hello dear Chris,
I sent several mail to him before this, but unfortunatly he didn't answer to mails ...

But what do you think about my problem ? what's wrong ?

Thank you for reply Rose | [Rose]

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Re: Other question about Carlos Antollini ADO classes !!!

Carlos Antollini12-Aug-02 19:45

Carlos Antollini

12-Aug-02 19:45

Hadi, It's 3 AM in Argentina... I will see that you say in the morning...
In a couple of Hours OMG | :OMG:

i need to

I don't know what happens but I didn't recive all the message. I saw your question here but I didn't recibe this question...
I make a question for you.
You tried with the following?

m_rs.AddNew();
m_rs.SetFieldValue("NAME", "Gen");
m_rs.Update();

m_rs.AddNew();
m_rs.SetFieldValue("NAME", "Brus Lee");
m_rs.Update();

m_rs.AddNew();
m_rs.SetFieldValue("NAME", "Arnold");
m_rs.Update();

m_rs.AddNew();
m_rs.SetFieldValue("NAME", "Hadi");
m_rs.Update();

Best Regards

Carlos Antollini.
Sonork ID 100.10529 cantollini

Re: Other question about Carlos Antollini ADO classes !!!

Hadi Rezaee12-Aug-02 19:51

Hadi Rezaee

12-Aug-02 19:51

Hello my frieeeeeeeeeeeeeeeend Big Grin | :-D

nice to see you Rose | [Rose]

You wroking hard Wink | ;)

ok, about the question ...
No, i'll try this way and tell you the result ...
But what is the problem in my pervious code ??

i mean:

m_rs.AddNew();
m_rs.SetFieldValue("NAME", "Gen");
m_rs.SetFieldValue("NAME", "Brus Lee");
m_rs.SetFieldValue("NAME", "Arnold");
m_rs.SetFieldValue("NAME", "Hadi");
m_rs.Update();

But, let me test your way ...
Thanks Smile | :)

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Re: Other question about Carlos Antollini ADO classes !!!

Hadi Rezaee12-Aug-02 23:54

Hadi Rezaee

12-Aug-02 23:54

Hello again Mr.Carlos,
If i tell you what was the problem you'll kill me Wink | ;)

I did a kiddy wrong,
my wrong was for index on the field ...

Thanks.

Smile | :)

My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html

Hadi Rezaie

Re: Other question about Carlos Antollini ADO classes !!!

pépé13-Aug-02 3:12

pépé

13-Aug-02 3:12

Anyway, when you insert records in a DB, you should not rely on the insertion order to retreive the data later.

Re: Other question about Carlos Antollini ADO classes !!!

Carlos Antollini13-Aug-02 4:16

Carlos Antollini

13-Aug-02 4:16

I suspected That...
I Don't want to start an international conflict, is for that you will live...

It's obvious that if you see the records in diferent order, is by a Index cause.....

Best Regards....

Carlos Antollini.
Sonork ID 100.10529 cantollini

Default property in COM

Anonymous12-Aug-02 19:07

Anonymous

12-Aug-02 19:07

How can I make a property of a COM to be the default property, say in Field object, it has get_Item(VARIANT *pval). I want in VB client, it can be accesses as MyObj.Field = "hello" instead of MyObj.Field.Item = "hello".

Re: Default property in COM

Stuart Dootson12-Aug-02 21:12

Stuart Dootson

12-Aug-02 21:12

Give it an id of DISPID_VALUE (that's 0) in the IDL :

[propget, helpstring("property Item"), id(DISPID_VALUE)] HRESULT Item([out, retval] BSTR *pVal);
[propput, helpstring("property Item"), id(DISPID_VALUE)] HRESULT Item([in] BSTR newVal);

HTH

Stuart Dootson

'Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p'

DLL Fundamentals :: MFC

valikac12-Aug-02 18:49

valikac

12-Aug-02 18:49

Hi.

I am learning DLL creation and implemention from Programming Applications for Microsoft Windows by Jeffrey Richter. Richter demonstrations are straightforward and appear simple. However, I cannot implement a working at all using Visual C++ .NET.

I tried using the DLL Wizard and hardcoding a .cpp and .h file. Neither method worked. I would like to create a simple dll with functions I can use in any C++ programs I work on including MFC. In fact, all my Windows program are MFC. Here is an example of the code.

-----
// myDLL.h

#ifndef myDLL
#define myDLL extern "C" __declspec(dllimport)
#endif

class myDLL MyClass
{
MyClass();
void FunctionOne();
int FunctionTwo();
~MyClass();
-----

-----
// myDLL.cpp

#define myDLL extern "C" __declspect(dllexport)
#include "stdafx.h"
#include "myDLL.h"

MyClass::MyClass()
{
}
...
-----

The code above uses the exact sample algorithm Richter presents in his book. It is does not work. I would like a good solid working example of creating a dll that works in both MFC and non-MFC Windows programs.

Thanks,
Kuphryn

Re: DLL Fundamentals :: MFC

BlackSmith12-Aug-02 22:44

BlackSmith

12-Aug-02 22:44

Try this:

1. open a new 'MFC AppWizzard (dll)', choose project name. >>> NEXT
2. Choose 'MFC Extension DLL (using shared MFC DLL)'. >>> FINISH
3. Add to project your classes ('*.h' + '*.cpp').
4. Add AFX_CLASS_EXT macro before your class name definition:

class AFX_EXT_CLASS CYourClass
{
public: 
void Method1();
//...............
//...............
};

5. After compiling a Release version, Pick out of the 'Release' folder
2 files: 'YourDLL.dll' + 'YourDLL.lib'.
6. In the project you wish to use'em, paste in its dir both of'em, and add
to the project 'YourDLL.lib' + 'YourClass.h' (with AFX_EXT_CLASS)
7. Compile and pray... Cool | :cool:

8. Please reply if this works well.
9. Succsess....

--BlackSmith--

"With the help of all mighty", 2001, Me.

Re: DLL Fundamentals :: MFC

valikac13-Aug-02 4:52

valikac

13-Aug-02 4:52

Okay. Thanks.

I will try your solution. I do have a question too. I thought when you create a DLL, the compiler produces just one simple DLL file in the release version. How come you mentioned a .lib and .h file?

Kuphryn

Re: DLL Fundamentals :: MFC

valikac13-Aug-02 6:20

valikac

13-Aug-02 6:20

Okay. Thanks.

CheckAbdoul posted a link at MSDN Newsgroups.

http://www.flipcode.com/tutorials/tut_dll01.shtml

That tutorial helped me.

The tutorial he gives helps me considerably. I am confused at the point where the compiler produces a .dll, .lib, and .h file.

For implicit implementation, you have to including the .h file in the source code and import the .lib file. I do not quite understand that process. I believe the compiler only produce a .dll file and you import that file in your source code only. However, I learn that is true for explicit implementation.

Well, explicit implementation is quicker because you do not have to search for the .h and .lib as well as .dll file. Nonetheless, both implicit and explicit implementations are essential.

Kuphryn

Re: Just Impossible!

valikac13-Aug-02 7:38

valikac

13-Aug-02 7:38

Okay. I just cannot get the compiler to compile the dll without errors.

I have uploaded the entire dll project to my website. Please check it out and see if you can determine the error. I use the exact same technique Jeffrey Richter shows in his book. However, the compiler saying a .pch file cannot be found. Second, I do not understand why Visual C++ includes the stdafx.h file in all projects.

http://www.dslextreme.com/users/kuphryn/software/FirstDLL.zip

Please post if you find an unconditional working solution.

Thanks,
Kuphryn

Re: Just Impossible!

valikac13-Aug-02 15:02

valikac

13-Aug-02 15:02

Okay. I finally fixed the problem with help from Dean Harding of GameDev.

One more questions.

Here is one working DLL declaration.

-----
#if defined(FIRSTDLL_DLL)
# define FIRSTDLL extern "C" __declspec(dllexport)
#else
# define FIRSTDLL extern "C" __declspec(dllimport)
#endif
-----

I am able to compiler the DLL using this code too.

-----
// FirstDLL.h
#ifndef FIRSTDLL_H
#define FIRSTDLL_H

#define IMPORT __declspec(dllimport)
#define EXPORT __declspec(dllexport)

#ifdef __cplusplus
extern "C"
{
#endif

class EXPORT myClass
{
...
};

#ifdef __cplusplus
}
#endif

#endif
-----

Is there an advantage one declaration has over the other?

Thanks,
Kuphryn

Controls redrawn in odd places??

JennyP12-Aug-02 18:38

JennyP

12-Aug-02 18:38

Hello,

I have a dialog bar that contains the following SliderCtrl message handler:

OnCustomdrawSliderProg(NMHDR* pNMHDR, LRESULT* pResult)

Inside this handler, I call another function to update a 2nd dialog bar's windows. However, when this occurs, the slider control is randomly (time) redrawn on the 2nd dialogbar's client area at random places. I assume I'm mixing device contexts somehow.

Functionally I want my 2nd dialog bar to have a 'live' response to a user adjusting the CSliderCtrl on the 1st dialog bar. Has anyone a solution for a clean way to do this? I've tried to handle the lose-focus SliderCtrl message (works without odd slider drawing), but then if the user uses the arrow keys, the 2nd dialog bar is not updated.

Thanks!

JennyP

Re: Controls redrawn in odd places??

Tomasz Sowinski13-Aug-02 1:55

Tomasz Sowinski

13-Aug-02 1:55

JennyP wrote:
Functionally I want my 2nd dialog bar to have a 'live' response to a user adjusting the CSliderCtrl on the 1st dialog bar

Handle WM_HSCROLL - this message is sent whenever thumb is moved using mouse/keyboard. When user releases the mouse, you'll get WM_HSCROLL with TB_ENDTRACK code. You'll also get TB_ENDTRACK after each keypress changing thumb position.

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

What is "scratch" and why can everything be made from it?

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