vtable pointer initialize failed! [modified] - C / C++ / MFC Discussion Boards

Re: Macro Preprocessing

Stephen Hewitt31-Jan-07 19:51

Stephen Hewitt

31-Jan-07 19:51

You can use the /P[^] option with Microsoft compilers.

Steve

Re: Macro Preprocessing

abhi_code16-Feb-07 5:18

abhi_code

16-Feb-07 5:18

Thanks a lot Stephen!
I think that should work...I will try out this compiler switch.

Abhijeet Jadhav

CMap problem

~Worried!31-Jan-07 18:59

~Worried!

31-Jan-07 18:59

I am using a CMap

CMap<cstring,lpcstr,int,int> my_map;
my_map.SetAt("abc",1);
my_map.SetAt("xyz",22);
...

I need this map to be globaly accessible in my application, therefore I am initialising this in a common header file of my application.

But when i compile the coe I get following errors:

: error C2143: syntax error : missing ';' before '.'
: error C2501: 'my_map' : missing storage-class or type specifiers
: error C2371: 'my_map' : redefinition; different basic types
: see declaration of 'my_map'

Any pointers?

Re: CMap problem

prasad_som31-Jan-07 19:08

prasad_som

31-Jan-07 19:08

~Worried! wrote:
error C2143: syntax error : missing ';' before '.'
: error C2501: 'my_map' : missing storage-class or type specifiers

CMap is declared in afxtempl.h, you need to include that file.

~Worried! wrote:
I need this map to be globaly accessible in my application, therefore I am initialising this in a common header file of my application.

In this case, use extern.
In common header,

extern CMap my_map;

And in one on cpp file define it.
i.e.

CMap my_map;

Prasad
Notifier using ATL | Operator new[],delete[][^]

Re: CMap problem

~Worried!31-Jan-07 21:25

~Worried!

31-Jan-07 21:25

prasad_som wrote:
CMap is declared in afxtempl.h, you need to include that file.

Even then the error does not go.

Actually there is no seperate .cpp file here. This header file contains all the constants etc required in my app. I just want to associate some key-value pairs so that they can be searched some time later in the applicataion.

Re: CMap problem

ThatsAlok31-Jan-07 20:08

ThatsAlok

31-Jan-07 20:08

~Worried! wrote:
CMap my_map;

where is key value pair

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

cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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Re: CMap problem

~Worried!31-Jan-07 21:26

~Worried!

31-Jan-07 21:26

ThatsAlok wrote:
where is key value pair

In the same header file.

vtable pointer initialize failed! [modified]

white jungle31-Jan-07 17:42

white jungle

31-Jan-07 17:42

I dont' know how to named the title!
My program is compiled by vc6+sp6+SDK2003 with release mode but have debug information in it
And there is a static member called A(faked name).
And is a instance of class CSite.CSite is inherited from a abstract class.
example:
class Base
{
void virtual int add(int a,int b)=0;
};
class CSite:public Base
{
//blablabla...
};
When debug the program and set a breakpoint at the construtor of the member A.
I found that the vtable pointer was initlialized to NULL.
And of course the program crashed!

I have no idea with this issue!
Can any one who please give me a handle on this!

BTW:there is not anything wrong if I debug the program in debug mode!

Thank you very much!

I must appologise for my poor english,hope you can understand what I said!

-- modified at 23:47 Wednesday 31st January, 2007

Don't look at me in that way!

Re: vtable pointer initialize failed!

Stephen Hewitt31-Jan-07 18:29

Stephen Hewitt

31-Jan-07 18:29

Can you show this "A"?

Steve

Re: vtable pointer initialize failed!

white jungle31-Jan-07 18:42

white jungle

31-Jan-07 18:42

A is a static instance of class CSite

<br />
class ISite<br />
{<br />
public:<br />
	virtual const char* getSiteName() =0;<br />
	virtual bool postRequest() =0;<br />
.....//there is a lot of method in this class!<br />
};<br />
class CSite:public ISite<br />
{<br />
public :<br />
 //implement of virtual method of baseclass <br />
......<br />
}<br />

in some other cpp file,I make a static member like this:

<br />
static CSite defaultSite;<br />

Now I set Optimizations to normal in project setting!But the problem is still there!

Don't look at me in that way!

Re: vtable pointer initialize failed!

Stephen Hewitt31-Jan-07 18:44

Stephen Hewitt

31-Jan-07 18:44

Can you show we where the crash occurs? I suspect you are relying on the order of static initialisation.

Steve

Re: vtable pointer initialize failed!

white jungle31-Jan-07 19:48

white jungle

31-Jan-07 19:48

Thank you very much Hewitt!
I think I solved the problem follow your reminder.
now everything is seemed OK!

the class CSite has also some static member,and these member is defined at the 'site.cpp' ,but I define the defaultSite instance at the other cpp file (services.cpp)before!I think this is why I get a error!
Now I move the definition of defaultSite into the 'site.cpp'.

Thank you again for your help!
^_^

Don't look at me in that way!

Problem with winsock2.0

lastgen31-Jan-07 17:41

lastgen

31-Jan-07 17:41

I'm having a couple of little problems with a listening socket connection. I've worked with winsock before but that was a long time ago. Essentially this is the procedure.

App-A is the sender,
App-B is the receiver.

App-B is running constantly listening for a connection.
App-A(which is not always running) connects to App-B when required and sends a message, and closes the connection afterwards.

The problem I'm having is this.

if App-A executes too quickly, App-B gets an WSAECONNRESET error on calling "recv"

I can get around this by slowing App-A down with for loops/sleep commands and other such hacks, but would prefer not to do this.

The other problem I get is if App-A abnormally terminates, App-B sits in a loop constantly receiving the last message sent by App-A. This isn't a large concern as I'm deliberately causing App-A to fail as a stress test which is unlikely to occur.

I'm guessing either App-A needs to wait and ensure the message has been received before closing down, or App-B needs to queue messages somehow.

Any tips?

When I die I'd like to go peacefully in my sleep like my father, not screaming in terror like his passengers!!!

Re: Problem with winsock2.0

Sakthiu31-Jan-07 18:25

Sakthiu

31-Jan-07 18:25

Hi,

are you using multiple sends and recv(s) ?

My idea is that use single send(send whole data) and do multiple recv() fn.

Once recv fn gets all bytes of data, send a single ACK to server. Thereafter you can close your server socket connection.

Bye.

Nice things do nice works

Re: Problem with winsock2.0

lastgen31-Jan-07 18:42

lastgen

31-Jan-07 18:42

Thanks for the help, but I've figured it out, and the answer simply foolish WTF | :WTF:

.

I wasn't closing the connection correctly, hence the lack of buffer flushing

As for the repeat message, it wasn't repeating.

The message was being stored in a buffer with a static pointer, and because I neglected to check the data size returned from recv I was assuming the data pointed to was the latest message, but recv was in fact returning 0.

When I die I'd like to go peacefully in my sleep like my father, not screaming in terror like his passengers!!!

autoview CD

hoa_nguyen31-Jan-07 17:00

hoa_nguyen

31-Jan-07 17:00

can someone send me the code to create application that does "autoview CD" by visual C++.
thanks verry much.

Re: autoview CD

Hamid_RT31-Jan-07 18:30

Hamid_RT

31-Jan-07 18:30

I think you asked this question yesterday,can you be more specific

WhiteSky

Re: autoview CD

hoa_nguyen31-Jan-07 23:18

hoa_nguyen

31-Jan-07 23:18

Viết chương trình AutoView CD
Mô tả:
Khi chương trình chạy, thể hiện icon trên system tray.
Chương trình cần nhận biết được khi nào user đưa đĩa CD vào ổ đĩa, và tự động hiển thị danh
sách file / folder của CD lên một dialog.
Lưu ý: chỉ cần hiển thị các file/folder trong thư mục gốc của CD. Không yêu cầu cài đặt
thao tác trên file/folder (VD. mở file/folder,…) Confused | :confused:

Re: autoview CD

Hamid_RT1-Feb-07 0:11

Hamid_RT

1-Feb-07 0:11

What

WhiteSky

Re: autoview CD

hoa_nguyen1-Feb-07 23:04

hoa_nguyen

1-Feb-07 23:04

when program run, show icon in system tray
program must be to know when user insert CD into drive, display automatically list file/folder of CD on a dialog
D'Oh! | :doh:

Re: autoview CD

Hamid_RT2-Feb-07 4:14

Hamid_RT

2-Feb-07 4:14

See Receiving Device Event Notification in Windows Service(Detecting Hardware Insertion and/or Removal in Service)[^] if its helpfuls

WhiteSky

Re: autoview CD

Hamid_RT2-Feb-07 4:16

Hamid_RT

2-Feb-07 4:16

And also I think you want to read autocad files if yes see http://www.wotsit.org[^] I think its helpful for you Wink | ;)

WhiteSky

Re: autoview CD

Hamid_RT3-Feb-07 23:49

Hamid_RT

3-Feb-07 23:49

I think you want to open/load autocad files so I suggest this site but wasnt helpfuls?

WhiteSky

API Based Applications and Software Applications

Khoramdin31-Jan-07 16:48

Khoramdin

31-Jan-07 16:48

Hello everyone,

I was wondering if anyone can be kind enough to tell me what is the difference between the Home-Made API Based Software Application that I made using Visual Studio and the Commercial Software Applications.

1- Do they use a different approach?
2- Do they have a secret recipe for their software application development?

Let me take this opportunity to thank you in advance for your help.

Khoramdin

Re: API Based Applications and Software Applications

Hans Dietrich18-Feb-07 0:23

Hans Dietrich

18-Feb-07 0:23

What APIs are you using in your home-made application? In general, Windows apps are all based on the Win32 API, although there are several different frameworks (ATL, WTL, MFC, etc.).

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