C / C++ / MFC

19-May-03 0:46

Hi everyone,

I have a C++ dll that has a few function interfaces to VB. Now, I need to pass a C++ class pointer to VB that they should be able to use or pass to another C++ dll.

Is it possible that I can pass the class pointer as a long value and they can cast it later or something.

I am really confused about this and some suggestion or even a small code snippet would be greatly appreciated.

Best regards,

Pankaj

P.S: it is not an ATL DLL.

Without struggle, there is no progress

Jason Henderson19-May-03 3:09

Jason Henderson

19-May-03 3:09

That should work.

Jason Henderson

My articles

"The best argument against democracy is a five-minute conversation with the average voter." - Winston Churchill

pankajdaga19-May-03 4:14

19-May-03 4:14

Ok, I have the following function definition in C++:

long _stdcall GetInstance_()
{
return (long)pCtrl;
}

Now after I get this long value in VB. How can I cast it back to the object? Does VB even know about the original object?

Thanks,

Pankaj

Without struggle, there is no progress

Jason Henderson19-May-03 4:22

Jason Henderson

19-May-03 4:22

VB isn't going to be able to use a C++ class pointer, but you can pass it to another C++ app or dll for use.

Jason Henderson

My articles

"The best argument against democracy is a five-minute conversation with the average voter." - Winston Churchill

pankajdaga19-May-03 4:35

19-May-03 4:35

Hi again,

Even if the other app does not know about this class? Does it need the header file or do I need to export this class in some way. If it is not too much hassle, can you post a small code snippet that I can use as a guideline?

Thanks,
Pankaj

Without struggle, there is no progress

Jason Henderson19-May-03 4:55

Jason Henderson

19-May-03 4:55

Just think about it.

How could another app use a c++ class when it is not defined in that other app. If you include the header, it should work.

I don't have a code snippet handy.

Jason Henderson

My articles

"The best argument against democracy is a five-minute conversation with the average voter." - Winston Churchill

pankajdaga19-May-03 4:58

Mapping Accelerator to Dialog Boxes.

19-May-03 4:58

Yeah,

I was wondering if linking the lib file would be of any help.

Pankaj

Without struggle, there is no progress

Jawache19-May-03 0:24

Jawache

19-May-03 0:24

I can't seem to map my accelerator keys to my dialog.

I have mapped the Accelerator 'Alt + 1' to my Dialog class but the functions are not being called?

If I map the accelerator keys to my MainFrame (to try to forward them to my Dialog) then the functions are not called when the dialog box is displayed.

No matter what I do I cannot seem to use accelerator keys when a dialog box is being displayed.

I know I'm doing something stupid becuase I've seen this functionality before.

Any ideas?

Cheers

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

Re: Mapping Accelerator to Dialog Boxes.

Jawache19-May-03 0:36

Jawache

19-May-03 0:36

I should just RTFM before I start posting shouldn't I.
Figured it out from here:
http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q222/8/29.ASP&NoWebContent=1

Asim Hussain
e: asim@jawache.net
w: www.jawache.net

How to send email ?

Nguyen Huynh Hung19-May-03 0:12

Nguyen Huynh Hung

19-May-03 0:12

How to write an application to send email.
I have:
FROM_email_address.
TO_email_address.
Subject, body of mail.
After a click on the button, the content will be send.

Re: How to send email ?

Dominik Reichl19-May-03 0:53

Dominik Reichl

19-May-03 0:53

I like this MFC class:

http://www.naughter.com/smtp.html[^]

Big Grin | :-D

-Dominik

_outp(0x64, 0xAD);
and
__asm mov al, 0xAD __asm out 0x64, al
do the same... but what do they do??

Re: How to send email ?

Renjith Ramachandran19-May-03 6:13

Renjith Ramachandran

19-May-03 6:13

hope that i can complete and post an article shortly.

[ It is possible to represent everything in this universe by using 0 and 1 ]

Tracking Memory Allocations

The_Server19-May-03 0:02

The_Server

19-May-03 0:02

HI ALL

I want that every memory allocation will be tracked...

is there a way for me to overwrite the new and delete functions...

this and every other solution will be appreciated gracefully.

Objective: Tracking Memory Allocations

Thank you all...

Rose | [Rose]

-==--==--==--==--==--==-
=--= The Server =--=
-==--==--==--==--==--==-

Vikram A Punathambekar19-May-03 0:09

19-May-03 0:09

The_Server wrote:
is there a way for me to overwrite the new and delete functions...

I'm assuming you meant to say overload , because new and delete are not functions; they are operators. In that case, no- these operators CANNOT be overloaded.

[EDIT]Red alert! Red alert! I made a horrifying mistake. Both new and delete can be overloaded. See all posts below.[/EDIT]

Regards,

Vikram.
-----------------------------
My site due for a massive update

1. Don't ask unnecessary questions. You know what I mean?
2. Avoid redundancy at all costs.
3. Avoid redundancy at all costs.

"Do not give redundant error messages again and again." - A classmate of mine, while giving a class talk on error detection in compiler design.

Neville Franks19-May-03 0:29

Neville Franks

19-May-03 0:29

Vikram Punathambekar wrote:
I'm assuming you meant to say overload , because new and delete are not functions; they are operators. In that case, no- these operators CANNOT be overloaded.

Vikram, I'm afraid you aren't right. The new operator calls a function to allocate memory and you can overload or rewrite that. There is also "placement new". Look up a good C++ reference for more info. "More Effectiver C++" covers this briefly. And there maybe articles here on CP about overloading new and delete if my memory serves me correctly.

Neville Franks, Author of ED for Windows. Free Trial at www.getsoft.com

Vikram A Punathambekar19-May-03 0:55

19-May-03 0:55

Neville Franks wrote:
Vikram, I'm afraid you aren't right.

Yes, I'm afraid you're right. Punning apart, thanks for correcting me. Yes, new can be overloaded and so can delete.In fact, I guess even calls like

int *p=new int[10];

and

foo *ptr=new foo;

can be considered overloading, right? I wasn't drinking. I feel so dumb Blush | :O

...I wonder if learning VB is any fun?

Vikram.
-----------------------------
My site due for a massive update

1. Don't ask unnecessary questions. You know what I mean?
2. Avoid redundancy at all costs.
3. Avoid redundancy at all costs.

"Do not give redundant error messages again and again." - A classmate of mine, while giving a class talk on error detection in compiler design.

Vikram A Punathambekar19-May-03 1:08

19-May-03 1:08

I thought this warranted a second reply- new is an operator, isn't it? It calls a function alright, just like you have to define a function when you're overloading the + operator for, say, a Complex class. But that doesn't mean + becomes a function, even w.r.t. class Complex Unsure | :~

And yeah, my 5 for pointing it out. Smile | :)

Thanks,

Vikram.
-----------------------------
My site due for a massive update

1. Don't ask unnecessary questions. You know what I mean?
2. Avoid redundancy at all costs.
3. Avoid redundancy at all costs.

"Do not give redundant error messages again and again." - A classmate of mine, while giving a class talk on error detection in compiler design.

pankajdaga19-May-03 0:48

19-May-03 0:48

Hi,

Both new and delete can be overloaded. Also, after overloading, you can still call the global new by ::new()

Pankaj

Without struggle, there is no progress

Vikram A Punathambekar19-May-03 0:57

19-May-03 0:57

Yes, I made a mistake Blush | :O

. I don't even know what I confused it with. See my earlier post.

Thanx for pointing it out.

Vikram.
-----------------------------
My site due for a massive update

1. Don't ask unnecessary questions. You know what I mean?
2. Avoid redundancy at all costs.
3. Avoid redundancy at all costs.

"Do not give redundant error messages again and again." - A classmate of mine, while giving a class talk on error detection in compiler design.