Managed C++/CLI

Re: c++ code to take a pic with a webcam then save it as bitmap?

1-Feb-07 9:18

I don't think there are many C++/CLI samples for this, but if you instead use regular C++ ( and therefore ask in the C++ forum ), the DirectShow SDK almost certainly contains samples. You'll need DirectShow to do this, in any case. Even in C++/CLI

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

ricardo montemayor1-Feb-07 9:30

ricardo montemayor

1-Feb-07 9:30

so i need directshow sdk so i can do that and they got samples of how to write that code to do what i want??? i need to do it in C++

Re: c++ code to take a pic with a webcam then save it as bitmap?

Christian Graus1-Feb-07 10:22

Re: c++ code to take a pic with a webcam then save it as bitmap?

1-Feb-07 10:22

OK, then you're asking in the wrong forum. This is the C++/CLI forum.

Yes, you need directshow, which is now in the platform SDK. There are samples on CP, in the SDK, and generally on the web.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

ricardo montemayor1-Feb-07 11:53

ricardo montemayor

1-Feb-07 11:53

then where should i ask then
and what is directshow or platform sdk

Re: c++ code to take a pic with a webcam then save it as bitmap?

Christian Graus1-Feb-07 18:07

Type convertion from System::String to char*

1-Feb-07 18:07

ricardo montemayor wrote:
what is directshow or platform sdk

They are both things that are easily found with google.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Shahzeb Malik31-Jan-07 23:20

Shahzeb Malik

31-Jan-07 23:20

hi all,
i want to create a user friendly interface for other MS products the question is that VB.NET sends string value and C++ APIs require char*
project consist of VB application -> C# class library -> C++ class library(managed)
Now, when i create a function which accepts char* it raises error cannot convert string to char*
and when i change the function to System::String it is pain to convert it to char* can any one please tell me how to make it work

Thanks!

Shahzeb

Re: Type convertion from System::String to char*

led mike1-Feb-07 4:34

led mike

1-Feb-07 4:34

Shahzeb Malik wrote:
can any one please tell me how to make it work

They hide that information in the documentation[^]

led mike

might be simple question but pls reply

kalaveer31-Jan-07 19:58

kalaveer

31-Jan-07 19:58

what is the meaning of following declaration

typedef void _TY;

Thanks,
kalaveer.

Re: might be simple question but pls reply

prasad_som31-Jan-07 20:12

prasad_som

31-Jan-07 20:12

Before answering this question, let me tell you. This question should be asked in VC++ forum.

kalaveer wrote:
typedef void _TY;

Its a used to synonyms. In code above, now _TY foo(); declaration is actually equivalent to void foo();

Some times it is better to use typedef.
eg.
typedef char* PCHAR;
PCHAR can be easily used throughout the code as synonym of char*.

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

debugging mixed assemblies

bostjan2531-Jan-07 2:42

bostjan25

31-Jan-07 2:42

I have a C++ assembly that contains managed and unmanaged code. I can set breakpoints within the unamanaged functions, but they will not be hit. When I run debugging, full red circle in unmanaged part becomes an empty one and it says "The Breakpoint will currently not be hit. No executable code is associated with this line". Interesting thing is, this code does get executed, because i can see the results. I can debug managed code without any problems. Help?

Bartosz Bien31-Jan-07 3:03

Bartosz Bien

31-Jan-07 3:03

In all your projects, set the Debugger Type to Mixed rather than Auto (which is the default setting). Plus, make sure that you generate the debug info for all projects.

Regards,
BB
http://spin.bartoszbien.com

bostjan2531-Jan-07 7:41

bostjan25

31-Jan-07 7:41

thank you, but problem was in C# gui for that project. If you don't check "enable unmanaged code debugging" there nothing else helps.

greetz

Bartosz Bien31-Jan-07 12:01

Bartosz Bien

31-Jan-07 12:01

I understand you have an unmanaged regular C++ DLL that you are using in a C# executable, am I right? If so, try setting the DLL as an active project, and specify the C# exe as a debug executable for that DLL.

Also, don't forget about the working directory if you are accessing data from relative paths.

Regards,
BB
http://spin.bartoszbien.com

bostjan251-Feb-07 12:15

bostjan25

1-Feb-07 12:15

No, actually I have a mixed C++ DLL and am using a C# executable. But no worries, I already solved my problem as I wrote earliear.

want java code

hi_prk_bably30-Jan-07 22:23

hi_prk_bably

30-Jan-07 22:23

hi i want java code for hiding a text in a bmp file. also i want DCT (discrete cosine transform ) to be used for hiding the text in bmp file.
please i want it as soon as possible

Re: want java code

prasad_som30-Jan-07 22:36

prasad_som

30-Jan-07 22:36

Come on ! this is MS centric site. I doubt , if you could get any answer here. Post this query at appropriate site.

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

Re: want java code

Mark Salsbery31-Jan-07 7:48

Mark Salsbery

31-Jan-07 7:48

Hi I want a Porsche 911[^].
please i want it as soon as possible

Re: want java code

Christian Graus31-Jan-07 15:02

reading array of integers in C++ from Matlab

31-Jan-07 15:02

hi_prk_bably wrote:
i want it as soon as possible

And yet, you're asking on a site with no visible Java forum or other Java support, in the forum with the least readers ( C++/CLI ) ????

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Octavio10030-Jan-07 7:56

Octavio100

30-Jan-07 7:56

Hello,
How can I read a Matlab array of integers in C++ using mexfiles. I found it's easy to read array of doubles with mxGetPr, but I could not find how to do it with integers.
Any help would be appreciates.

Oct.

Christian Graus30-Jan-07 9:23

30-Jan-07 9:23

You're using C++/CLI with Matlab ?

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Octavio10030-Jan-07 9:44

Octavio100

30-Jan-07 9:44

Hi,

What I have is a Matlab code, and I am writing some of the subrutines in c++ using mexfiles to speed up the computations. Then you can compile this cpp files and use them in Matlab as any other function.

Mexfiles allow you to write a c++ code and through a so called gateway function just translate the input parameters from Matlab to C++, perform the operations you have to do, and then translate back the output from C++ to Matlab.

My problem is that I cannot find a way to translate an array of integers. Using the mxGetPr function you can translate an array of doubles. I am trying to read as input an array of integers and I cannot find the way.

I am not sure what CLI is.

Oct.

Christian Graus30-Jan-07 10:59

30-Jan-07 10:59

OK, so you're using VS.NET and C++/CLI ( C++ with .NET ), or are you in the wrong forum ?

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert