Re: What is #pragma pack()? - C / C++ / MFC Discussion Boards

MK7818-May-05 23:59

18-May-05 23:59

My stdafx.h is:

#ifndef _AFX_NO_DB_SUPPORT
#include <afxdb.h> // MFC ODBC database classes
#endif // _AFX_NO_DB_SUPPORT

#ifndef _AFX_NO_DAO_SUPPORT
#include <afxdao.h> // MFC DAO database classes
#endif // _AFX_NO_DAO_SUPPORT

#pragma warning(disable:4146)
#import <msado15.dll> rename_namespace("ADODB") rename( "EOF", "EndOfFile" )
#pragma warning (default: 4146)

this work correctly.

My problem rises when it includes the class "Ado2.h" in some .cpp

msjro.tlh(48) : error C2011: 'ReplicaTypeEnum' : 'enum' type redefinition
cl.exe terminated at user request.

This why ADO and DAO use the same enum.....

Re: DAO and ADO in same project

RChin19-May-05 0:22

RChin

19-May-05 0:22

MK78 wrote:
msjro.tlh(48) : error C2011: 'ReplicaTypeEnum' : 'enum' type redefinition

Ahh yes, JRO!
There are a host of conflicts between the JRO, ADO and DAO that you will get when you host all of them at once. To solve this, you will need to tinker with their namespaces definition a bit.

Below is the method that I use to resovle this conflict. The code below was used in the stdafx.h file, but your problem is located in the ado2.h file. you may want to modify the file directly, or relocate the importation routine to your stdafx.h file.

<code>]
// See Microsoft Knowledge Base: Q253317 for warning messages.
#pragma warning(push)
#pragma warning(disable:4146)
<font color=green>//
// However there are conflicts when they are declared
// (imported, in the case of ADO) together.
//
// I have experimented to get declaration/import order correct for compilation.
//
// .The JRO importation must come after the ADO declaration.
// .Rename the JRO namespace to avoid conflicts.
// .To avoid conflicts, place the DAO declarations after the ADOX and ADO imports</font>
#import "C:\Program Files\Common Files\system\ado\msadox.dll"
#import "C:\Program Files\Common Files\System\ado\msado15.dll" rename ("EOF","ADOEOF")			// ADO
#import "C:\Program Files\Common Files\system\ado\msjro.dll" rename_namespace("JRODB")			// Jet Replication Objects (JRO)
#import "C:\Program Files\Common Files\System\Ole DB\oledb32.dll" rename_namespace("oledb")		// OLEDB 
//
using namespace ADODB;
#pragma warning(pop)
#include <afxdao.h>				// DAO declarations
</code>

I Dream of Absolute Zero

Re: DAO and ADO in same project

MK7819-May-05 1:47

MK78

19-May-05 1:47

Ok works!

Thanks!

Too many plans make the health badly...

Problems with a dll

JaVinci18-May-05 22:27

JaVinci

18-May-05 22:27

Hi!

I'm trying to import a dll in Visual C++ 6. Can anybody help me?

When I link to that dll from another project it doesn't work. I'm sure I'm missing something, but I don't know what...

Here's how the dll is written (no errors, no warnings):

**************
* whatever.h *
**************

#ifdef __cplusplus
extern "C"{
#endif

class __declspec(dllexport) MyClass{
private:
char myString[100];
int myInteger;
public:
MyClass();
void getMyString(char * str);
int getMyInteger(void);
void setMyString(char * str);
void setMyInteger(int);
};

__declspec(dllexport) int function(MyClass * mc);

****************
* whatever.cpp *
****************

Just implementation here...

What can I do to import the class and the function from that dll (preferably not using a .def file)??? Please, help me, I'm going mad...
Cry | :((

Thank you!!!

Re: Problems with a dll

GDavy19-May-05 0:00

GDavy

19-May-05 0:00

when importing you need to declare __declspec(dllimport)

An often used method when writing dll^s is following:
in the header write a statement like

#ifdef __MY_DLL_PROJECT__
#define _DECSPEC_ __declspec(dllexport)
#else
#define _DECSPEC_ __declspec(dllimport)
#endif

all you need to do is define the symbol _MY_DLL_PROJECT_ in your dll project, and
define your class in the header as:

class _DECSPEC_ MyClass
{
...
};

Greetings,
Davy

Re: Problems with a dll

JaVinci19-May-05 3:50

JaVinci

19-May-05 3:50

Yeah, thanks...

I had already done that. I nearly kill myself when I realized that I wasn't setting the dependence between both projects. That was all I needed.

Thank you very much for your reply!!! Smile | :)

JaVinci

What is #pragma pack()?

xSoptik18-May-05 21:31

xSoptik

18-May-05 21:31

Hello all.
Can someone tell me in simple way what happen when I use preprocessor option #pragma pack ? I tryed it but I thing there is no effect.

Can you tell me what exactly happen?
Thank you a lot.

<br />
// sample code<br />
<br />
#pragma pack(1)   // turn byte alignment on ?????<br />
<br />
enum mENUM<br />
{<br />
   // an enum<br />
};<br />
struct p_mStruct<br />
{<br />
	UINT m_Ui;<br />
      // and so on<br />
};<br />
<br />
#pragma pack() // turn byte alignment off ?????<br />

Jaja Paja

Re: What is #pragma pack()?

Stlan18-May-05 22:06

Stlan

18-May-05 22:06

Perhaps a simple example is better than any explanation.
First case:

#pragma pack(1)<br />
struct MyStruct<br />
{<br />
BYTE a;<br />
UINT b;<br />
};<br />
#pragma pack()

sizeof(struct MyStruct) will return 5 bytes (1+4=5)

Second case:

#pragma pack(4)<br />
struct MyStruct<br />
{<br />
BYTE a;<br />
UINT b;<br />
};<br />
#pragma pack()

sizeof(struct MyStruct) will now return 8 bytes! (1+3+4=8) because the compiler aligns each member of MyStruct to a 4 bytes boundary. Concretly, the directive tells the compiler that the address of each member must be divisible by 4. To do that, the compiler insert the necessary blank bytes between variable members.

Re: What is #pragma pack()?

xSoptik19-May-05 1:14

xSoptik

19-May-05 1:14

Ok.
I understand now. Thank you a lot.
xSoptik

Grid controls with sliders and spin controls

surfdabbler18-May-05 21:15

surfdabbler

18-May-05 21:15

Anyone know if the Ultimate Grid is included in the Ultimate Toolbox? The website has no contact information, and the only way I can see to purchase these products is through codeproject... Unsure | :~

Chris Maunder's DataGrid is great, but I just don't have the time to implement slider controls and spin boxes. If anyone knows of good implementations of these, let me know. (The GridTreeCtrl has a spin box cell class in it, but it doesn't seem to work very well without the ability to hold down the spin control, and frequent double-count for a single click of the buttons.)

Communication

usmanmir18-May-05 20:43

usmanmir

18-May-05 20:43

I want to a program in vc 6 by using which i can send message say "HELLO" to all the active users on internet.
Can any one guide me or refer me to a good site or refer or provide me some useful links or direct or provide me some source code in vc 6 of the above stated problem.

Re: Communication

toxcct18-May-05 20:49

toxcct

18-May-05 20:49

you talk about NET send ??

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Re: Communication

usmanmir18-May-05 21:04

usmanmir

18-May-05 21:04

Well i don't want to develop a Chat type of application.
I want to write an application just containing a "HELLO" message box , which is when activated spreads itself on the internet.
Thats what i mean.

Re: Communication

RChin18-May-05 21:31

RChin

18-May-05 21:31

usmanmir wrote:
which is when activated spreads itself on the internet

You mean like..a virus?

I Dream of Absolute Zero

Re: Communication

Joel Holdsworth19-May-05 0:54

Joel Holdsworth

19-May-05 0:54

Hahahaha... You're stupid. So you want to write a virus right? And you don't have the foggiest idea how to even start. And you ask the question in a forum for people who build software for a job. You really are stupid.

Joel Holdsworth

Wanna give me a job this summer?
Check out my online CV and project history[^] - now available in MSWord format![^]

Re: Communication

jmkhael19-May-05 2:13

jmkhael

19-May-05 2:13

Seeing the older posts he made, i guess he is trying to code a worm but using VB Smile | :)

Papa

while (TRUE)
Papa.WillLove ( Bebe ) ;

Re: Communication

Noro Korny19-May-05 2:30

Noro Korny

19-May-05 2:30

actually it's quite simple :

foreach(System.Internet.User usr in System.Internet.AllUsers)
{
usr.System.Windows.Forms.MessageBox.Show("Hello");
}

but maybe you will have som problems porting this C# code to VB

Rose | [Rose]

Re: Communication

Paul Watson19-May-05 1:33

Paul Watson

19-May-05 1:33

The. Whole. Entire. Internet. ?.

regards,
Paul Watson
South Africa

PMW Photography

Gary Wheeler wrote:
It's people like you that keep me heading for my big debut on CNN...

Re: Communication

ThatsAlok19-May-05 1:40

ThatsAlok

19-May-05 1:40

Paul Watson wrote:
The. Whole. Entire. Internet. ?.

Yep, So that he send Morning wish to each Internet user ... Good Morning Laugh | :laugh:

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

cheers,
Alok Gupta

Re: Communication

Anonymous19-May-05 1:48

Anonymous

19-May-05 1:48

ThatsAlok wrote:
Yep, So that he send Morning wish to each Internet user ...

Is he aware of time zones ??? Roll eyes | :rolleyes:

Greets
Roland

Re: Communication

Bob Stanneveld19-May-05 1:50

Bob Stanneveld

19-May-05 1:50

That won't work since there are people in different timezones... I don't like to get a goodmornig message before I go to sleep.. Wink | ;)

Blog[^]

Re: Communication

ThatsAlok19-May-05 2:32

ThatsAlok

19-May-05 2:32

Bob Stanneveld wrote:
... I don't like to get a goodmornig message before I go to sleep..

let convert It! he will send "GOD BLESS YOU"

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

cheers,
Alok Gupta

Re: Communication

usmanmir19-May-05 17:13

usmanmir

19-May-05 17:13

RegardLess of the time zone, when i send my that application containing hello message , it should go to all the users who are currently using the internet.
Yup you were rite. SomeThing like a virus but just from spreading point of view.

Re: Communication

Bob Stanneveld20-May-05 9:48

Bob Stanneveld

20-May-05 9:48

Why do you want something to spread just like a virus? If somebody wants your code, they will download it or something, but if somebody doesn't want it, don't bother them with it

Blog[^]

Re: Communication

El Corazon19-May-05 3:59

El Corazon

19-May-05 3:59

Paul Watson wrote:
The. Whole. Entire. Internet. ?.

He just wants to write a "hello world" program...

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

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