how to convert the function in IDL file to C#

Question

0.00/5 (No votes)

See more:

hi ,

i am having [in,out,size_is(Size)] byte compress_page[*] parameter in my idl file. now we are migrating to wcf.
can you please tell me know how we convert into C#.
for ex:

see this function in IDL file

C++

long RMTReadMultiPages(  [in] File fh,
                      [in, string] char prj[],
                      [in] long fileno,
                      [in] long extno,
                      [in] long pageStart,
                      [in,out] long *numPages,
                      [in] long transferSize,
                      [out] short *failCode,
                      [in,out,size_is(Size)] byte compress_page[*]
                     );

i have to write this function in C#.

CSS

I am trying to host my Wcf service with Entlib 5.0 Validation. When servie operation contracts go for validation they get crash. Whiel investigating, I found that ref keyword in Wcf service's operation giving this problem. E.g.:

Operation contract in service is like:

public void GetData(int ID, string name, ref string location) {};

Now, while validating string location, it gets crash and if I remove ref keyword it works fine.

Though, in EntLib version 4.0 there are no such issues.
i tried replacing "ref" with "out" the issue was solved..
that ref replacing with out means [in, out] replaced with out.. i am getting some junk values in "compress_page", i am suspecting that this because of When it acts as an input it taking junk values.

Thanks f
or advance for your coperation

Posted 30-Oct-14 3:49am

shiva_VC++

Updated 30-Oct-14 23:20pm

v4

Add a Solution

Comments

Richard MacCutchan 30-Oct-14 10:08am

The definition above gives you all the parameters and their types, what is the problem you are having?

shiva_VC++ 31-Oct-14 5:18am

I am trying to host my Wcf service with Entlib 5.0 Validation. When servie operation contracts go for validation they get crash. Whiel investigating, I found that ref keyword in Wcf service's operation giving this problem. E.g.:

Operation contract in service is like:

public void GetData(int ID, string name, ref string location) {};

Now, while validating string location, it gets crash and if I remove ref keyword it works fine.

Though, in EntLib version 4.0 there are no such issues.
i tried replacing "ref" with "out" the issue was solved..
that ref replacing with out means [in, out] replaced with out.. i am getting some junk values in "compress_page", i am suspecting that this because of When it acts as an input it taking junk values.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

George Jonsson · Accepted Answer · 2014-10-30T04:55:00

Solution 1

This list might give you some help.
Platform Invoke Data Types[^]

[in] can be removed
[out] corresponds to out
[in,out] can be replaced by ref

Here is an overview over IDL Understanding Interface Definition Language[^]

The Marshal Class[^] might be of help too.

Here is a Wiki page about PInvoke. http://en.wikipedia.org/wiki/Platform_Invocation_Services[^]
PInvoke.net[^] can be good to use as a reference. (However, I cannot access the site at the moment)

Maybe this question at StackOverflow will give some clues: Convert Interface IDL file to C#[^]

Or this CP article: Essential P/Invoke[^]

Posted 30-Oct-14 4:55am

George Jonsson

Updated 3-Nov-14 20:20pm

v3

Comments

shiva_VC++ 31-Oct-14 0:21am

thanks for your help,

the problem with ref key word . presently we are using Microsoft Enterprise library Version 4.0 we had thought to Migrate to MSE 5.0 .
I am trying to host my Wcf service with Entlib 5.0 Validation. When servie operation contracts go for validation they get crash. Whiel investigating, I found that ref keyword in Wcf service's operation giving this problem. E.g.:

Operation contract in service is like:

public void GetData(int ID, string name, ref string location) {}; [here ref in place of [in , out] in IDL file ]

Now, while validating string location, it gets crash and if I remove ref keyword it works fine.

Though, in EntLib version 4.0 there are no such issues.

George Jonsson 31-Oct-14 4:03am

Don't use ref and string, use StringBuilDer instead. And don't
forget to initialize with a length.

shiva_VC++ 31-Oct-14 5:23am

please give some example it is very help full to me,

thank you very much for this help

shiva_VC++ 31-Oct-14 5:30am

i have same problem with Byte, int also
like in above function
[in,out,size_is(Size)] byte compress_page[*] it will becomes
ref byte compress_page[].

here also "ref" causing the problem

George Jonsson 31-Oct-14 7:39am

For arrays you can try IntPtr (without ref).
Look at www.pinvoke.net for many examples of Win32 method signatures to c#

shiva_VC++ 2-Nov-14 22:45pm

ref string Value-- i can use stringbuilder,

ref byte page[]-- InPtr

for integers and integers arrays... can you please tell how can i proceed..
ref int value;
ref int indexs[];
..................
in pinvoke.net i have not able seen that Win32 method signatures to c# example..
can you please give your help....provide the link...

i am very thankfull for this
-------------------------------------------
one more thing is

IntPtr can acts as In and Out Like ref?
-------------------------------------------

i am using the C++/CLI wrappers

-------------------------------------------

George Jonsson 4-Nov-14 2:21am

See my updated answer.

If you use IntPtr for retrieving data, make sure to create memory that the IntPtr points to.

shiva_VC++ 5-Nov-14 1:46am

hi Jonsson, i am not using the pinvoke functions. is there any way to use "out"instead of "ref" parameter?

George Jonsson 6-Nov-14 0:29am

* Using out requires that the memory is allocated inside the method you are calling. Then you have to free that memory.
* Using ref means that you have to allocate memory before the call.

So it depends on the method you are calling.