Re: How to use C++ h files in C# ... ? - C# Discussion Boards

mpavas31-Jul-07 22:45

mpavas

31-Jul-07 22:45

I was thinking to convert a single file to dll using as below:
csc /target:library /out:CONNECTION.DLL app_code\Connection.cs

Shure creating a class library is the best Idea. I agree. Thank you

Pavas

PaulPrice31-Jul-07 22:16

PaulPrice

31-Jul-07 22:16

The detail was fine (again), I simply do not believe you are reading the answers, which in turn suggest to me that you have never read a reference manual in your life!

mpavas31-Jul-07 22:22

mpavas

31-Jul-07 22:22

yes i have never

Pavas

How to use C++ h files in C# ... ?

mpavas31-Jul-07 22:31

mpavas

31-Jul-07 22:31

Any ways thnaks for suggestion!

Pavas

Yanshof31-Jul-07 19:58

Yanshof

31-Jul-07 19:58

Hi All,

I have 2 project in my solution - the first is something old that was wrote in C++ and the other is something new that i writing in C#.

In the C++ project - i have some big file ( h file ( header )) that contain some struct, enum, define ... and more const Return code.

What i want to do is to use those information somehow.

How can i do it ? i don't want to write all those information as new information by myself again - i want to use the exist info...

Thanks for any help.

Christian Graus31-Jul-07 20:17

31-Jul-07 20:17

You really can't. You can build your header file as a managed C++ dll, and import it, that would work. However, you can't just use it in yuor project, how could you ?

Christian Graus - Microsoft MVP - C++

"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 )

Yanshof31-Jul-07 20:29

Yanshof

31-Jul-07 20:29

In general -

What i need to do in this case ?
I can use manages C++ code - but there is some example of how i can do it ?

Christian Graus31-Jul-07 20:36

31-Jul-07 20:36

MAke your header build into a dll and set the /clr option. Then you can import this dll into your C# project.

Christian Graus - Microsoft MVP - C++

"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 )

JPEG loseless and lossy compression

Yanshof31-Jul-07 20:40

Yanshof

31-Jul-07 20:40

ok , Thanks.

Darmi31-Jul-07 17:55

Darmi

31-Jul-07 17:55

Hi,

I want to implement JPEG loseless and lossy compression. Can anyone please help me.

Darmi

Christian Graus31-Jul-07 18:22

31-Jul-07 18:22

There are many 'JPEG' compressions. The most common one is the lossy one supported by GDI+. Creating files using this compression in C# is trivial. There are also a number of 'lossless' compressions, including JPEG 2000, JPEG lossless, etc. For JPEG 2000, I use the Atalasoft imaging library ( the J2000 stuff is an add on, and not cheap ). There are no free implimentations of J2000 that I know of, there is a JPEG lossless dll from HP, but I never actually got around to using it, I just found it in my search for a lossless compression supported by DICOM.

Christian Graus - Microsoft MVP - C++

"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 )

Darmi31-Jul-07 18:44

Darmi

31-Jul-07 18:44

Thanks Christian Graus,

But i need the implementation in C# or the algorithm to implement this compression techniques.

Thanks,
Darmi

Christian Graus31-Jul-07 18:52

31-Jul-07 18:52

I see. Well, I want a Ferrarri. Doesn't mean I can have one. Like I said, there are no C# implimentations for JPEG lossless that I know of. JPEG 2000, there are definately no free implimentations. The cheapest I found was Atalasoft, it's about $2000 plus the cost of their core library. It's very good, I use it.

Christian Graus - Microsoft MVP - C++

"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 )

Seishin#31-Jul-07 21:41

Seishin#

31-Jul-07 21:41

Image image;
...
Bitmap bmp = new Bitmap(image);

ImageCodecInfo[] codecs = ImageCodecInfo.GetImageEncoders();
ImageCodecInfo ici = null;
foreach(ImageCodecInfo codec in codecs) {
if(codec.MimeType == "image/jpeg")
ici = codec;
}
EncoderParameters ep = new EncoderParameters();
long quality = (long)100; // 0-lossy ... 100-loseless
ep.Param[0] = new EncoderParameter(Encoder.Quality, quality);

bmp.Save(fileName, ici, ep);

life is study!!!

Christian Graus31-Jul-07 22:01

31-Jul-07 22:01

No, you are totally wrong. Even at 100, a JPEG is lossy. It's just less so. And, as I said in my answer, there are many JPEG formats, including lossless ones. They are not supported by .NET, only the common lossy JPEG format is.

Christian Graus - Microsoft MVP - C++

"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 )

Seishin#31-Jul-07 23:10

Seishin#

31-Jul-07 23:10

Christian Graus wrote:
No, you are totally wrong

not totally I guess..

Christian Graus wrote:
Even at 100, a JPEG is lossy

maybe, but a lot less lossy than Image.Save()

life is study!!!