Error C2664 - Managed C++/CLI Discussion Boards

Create video on an OpenGL window by reading memory buffers containing image frames

DoctorDoctor22-May-07 7:54

22-May-07 7:54

Hi to all of you,

I am a new programmer on OpenGL.
I am currently working on an application where I have a Debian Linux PC with two usb industrial cameras,acquiring images at a rate of 25fps. Each image data is sent by sockets to a windows PC. The format of the received buffer at the windows PC side is buffer[0]='top left image pixel', buffer[640*480]='bottom right image pixel'. I want know to proccess these buffers an display a video on an OpenGL window at a similar frame rate, or even lower,i.e. even 5-10 frames per second will do for me.

Can anynone advised me with an appropriate approach?

Cheers,

DoctorDoctor

Verifying if one bit is set in a word value.

paper6722-May-07 6:16

paper67

22-May-07 6:16

Hi,

Does anybody now a macro to check if only one bit is set in a word value ?

Thx

About help

sarah_malik22-May-07 6:09

sarah_malik

22-May-07 6:09

Hi,
I have a menu on my application that contains a HELP toolstrip, I've finished doing the help project using the HTML workshop. Now how can I link this toolstrip to the Help.chm file?

thanks in advance,

Re: About help

Mark Salsbery22-May-07 7:42

Mark Salsbery

22-May-07 7:42

From managed code using .NET?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: About help

sarah_malik22-May-07 7:52

sarah_malik

22-May-07 7:52

yes

Re: About help

Mark Salsbery23-May-07 7:19

Mark Salsbery

23-May-07 7:19

see...

System.Windows.Forms.Help class[^]

C# but same .NET-related stuff applies: How to use the unmanaged HTML Help API from a managed Visual C# application[^]

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: About help

sarah_malik23-May-07 14:08

sarah_malik

23-May-07 14:08

Thank you.

Error C2664

dodoxor21-May-07 23:41

dodoxor

21-May-07 23:41

I've ref class. I 've to use a function "ccap_start_capturing" that take a ptr,and a ptr to a callback function(on_jpeg_received) and another ptr to a function on_exit_capturing defined in this class. Both "ccap_start_capturing" and "on_jpeg_received" functions are defined in a file c that i can't modify.

//#include ...
ref class CamPanObj{
public:
CamPanObj(){
camaddr=new camaddr_t();

}
protected:
~CamPanObj()
{//...
}
public:
static void on_exit_capturing(int code)
{/..
}
CAPID rec_start(void)
{
...
capid=ccap_start_capturing(camaddr,on_jpeg_received,on_exit_capturing);
return (capid);
}
};
It returns a compile error
error C2664: 'ccap_start_capturing' : cannot convert parameter 3 from 'void (__clrcall *)(int)' to 'void (__cdecl *)(int)'
None of the functions with this name in scope match the target type

How can i resolve it?
Thanks, regards.

Problem with Deserialization and Loading Assemblies

YooVeeAy21-May-07 10:46

YooVeeAy

21-May-07 10:46

I have 2 applications in which I serialize data in one and deserialize data in the other utilizing the binary formatter. However, whenever I try to deserialize, I get the following exception error:

"An unhandled exception of type 'System.Runtime.Serialization.SerializationException' occurred in mscorlib.dll. Additional information: Unable to find assembly 'projectname, Version=1.0.XXXX.XXXX, Culture=neutral, PublicKeyToken=null'.

I tried to resolve the assembly that it is trying to find by using the System::ResolveEventHandler delegate and registering this method with the System::AppDomain's AssemblyResolve event before calling the Deserialize method. The problem is the ResolveEventHandler never gets fired, so I can't even attempt to load the assembly and consequently, it always fails at deserialization. Are there any ideas of what I am doing wrong or any examples of code I can look at?

Re: Problem with Deserialization and Loading Assemblies

hansipet21-May-07 19:14

hansipet

21-May-07 19:14

I don't know if I understand it right. The error happens normally only if in the data which is deserialized are classes from an assembly which is not known in your project. Do you have a reference to this assembly in your second project?

Best regards
Hansjörg

Re: Problem with Deserialization and Loading Assemblies

YooVeeAy22-May-07 4:38

YooVeeAy

22-May-07 4:38

Yes, I have referenced the assembly in my second project. I found that I was unable to fire the ResolveEventHandler because there was a copy of the first executable in the same directory as my second executable. When I removed this first executable from the same directory, the ResolveEventHandler gets fired. However, now I am having issues with Assembly::Load. It appears that this Assembly::Load is getting called over and over without ever returning the assembly. Eventually, I get a stack overflow exception error. Any ideas?

Nesting Header Files

teejayem21-May-07 8:54

teejayem

21-May-07 8:54

I'm pretty new to C++/CLI so please bare with me. I have a header "MyThread.h" that contains a Thread class. I added an include directive at the top of my frmMain.h so i can create an instance of this class. Everything is fine with that but when i include frmMain.h to MyThread.h i get alot of compile errors. I read somewhere of where you could add something like:

#ifndef FRMMAIN_H
#define FRMMAIN_H
//class logic
#endif

to fix the issue but it isn't working. Any ideas?

Don't be overcome by evil, but overcome evil with good

Re: Nesting Header Files

Mark Salsbery21-May-07 9:19

Mark Salsbery

21-May-07 9:19

In one of the header files, you'll probably need a forward reference to avoid circular reference
problems.

Here's one way:

//---------------------------------------------------- 
//MyThread.h
#pragma once
 
class CfrmMain;
 
class CMyThread
{
   CfrmMain *pMainFrame;
};
 
 
//---------------------------------------------------- 
//MyThread.cpp
#include "stdafx.h"
#include "MyThread.h"
#include "frmMain.h"
...
 
 
//---------------------------------------------------- 
//frmMain.h
#pragma once
 
#include "MyThread.h"
  
class CfrmMain
{
   CMyThread *pMyThread;
};
 
 
//---------------------------------------------------- 
//frmMain.cpp
#include "stdafx.h"
#include "frmMain.h"
...

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Is there willl be any implicit funcations in an empty c++ class

Nandu_77b21-May-07 0:32

Nandu_77b

21-May-07 0:32

Hi,

I have observed that, when we create an empty class, it takes 1bite space. I don’t know why it takes 1bit space. Will there be any implicit function created when we create an empty class??

Thanks,
Nandu.

Re: Is there willl be any implicit funcations in an empty c++ class

Christian Graus21-May-07 1:04

Christian Graus

21-May-07 1:04

This is using C++/CLI, or are you in the wrong forum ?

I don't see how you can decide that an empty class takes up one byte. One byte where ?

Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )

Re: Is there willl be any implicit funcations in an empty c++ class

led mike21-May-07 5:54

led mike

21-May-07 5:54

Christian Graus wrote:
One byte where ?

He said one 'Bite'. Maybe it's an animal class or something. Big Grin | :-D

led mike

Re: Is there willl be any implicit funcations in an empty c++ class

sthotakura21-May-07 8:53

sthotakura

21-May-07 8:53

Hi Nandu,

There will not be any implicit functions created. However it just follows the simple rule
"Types can not be of ZERO size".

Cheers,
Suresh

Re: Is there willl be any implicit funcations in an empty c++ class

hansipet21-May-07 19:16

hansipet

21-May-07 19:16

Function does not need space (data)...

Re: Is there willl be any implicit funcations in an empty c++ class

Michael Dunn24-May-07 14:19

Michael Dunn

24-May-07 14:19

Why is the size of an empty class not zero?[^]

--Mike--
Visual C++ MVP Cool | :cool:

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Dunder-Mifflin, this is Pam.

remote app mysql problem

an-arhos20-May-07 22:45

an-arhos

20-May-07 22:45

Hi everyone,

I am using mysql 5.0.
I have a problem with my c++ application using mysql.
I compiled everything without any trouble.
Localy appliction works perfectly but when I upload it crash comes emediately.

Remotely I cannot use any function regarding mysql.
When I use mysql_init() application crashes.
Whitout mysql application is working.
On the server installed version of mysql is 5.027.

I cannot understand mistake.
If anyone can help me I would appreciate it very much.

an-arhos
Edit/Delete Message

Re: remote app mysql problem

Mark Salsbery21-May-07 5:43

Mark Salsbery

21-May-07 5:43