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Hi,
In C or C++,some structures are defined with union. How can
we rewrite these structure in C# so that we can use them as
parameters and pass them into API functions?
And, What's the correspondent type in C# to PVOID type in C?
Thanks in advance!
Angus Liu
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ykliu wrote:
In C or C++,some structures are defined with union. How can
we rewrite these structure in C# so that we can use them as
parameters and pass them into API functions?
e.g.
union U
{
int x;
int y;
}
can be written in C# as
[StructLayout(LayoutKind.Explicit)]
class U
{
[FieldOffset(0)]
int x;
[FieldOffset(0)]
int y;
}
ykliu wrote:
And, What's the correspondent type in C# to PVOID type in C?
There are two equivalents of PVOID in C#
1. void* this is when you are using C# pointers. Something which you should never do.
2. IntPtr this is used to encapsultae unmanaged pointers. Use this in conjunction with Marshal.StructureToPtr, Marshal.AllocCoTaskMem etc. functions. Look up all the functions in Marshal class it would be very helpful.
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Hi Rama,
Thank you very much, though, I don't understand all
of them, especially the Marshal part. I will keep
reading some document before asking another question.
Angus Liu
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i downloaded Rama's screensaver.
i want to ask a few questions:
1,when i test or run the screensaver,what did it do except display moving pictures?in James' screensaver when i press the "h" key,it will display help information!
2,Rama said "RBWRP.dll - This is a Managed C++ application that links with Ravi Bhavnani's WebResourceProvider libary to obtain Code Project Top 10 posters."
you obtain topposters through "webresourceprovider.lib" or "cp's webservices"?
and in RBWRP.dll,how to link with "webresourceprovider.lib"?(maybe stupid question,but i am a beginner,so forgive me  )
thanks in advance!
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zhoujun wrote:
when i test or run the screensaver,what did it do except display moving pictures?in James' screensaver when i press the "h" key,it will display help information!
So it's James screensaver now ? Are you reading this James ? 
Seriously, our screensaver is a bit non-standard in that it has a number of keys. Most screensavers do not AFAIK.
Rama AFAIK does not use the webservice as he had written his own ultra cool web service for harvesting information. That's why he has the top 10 posters, although the web service does not offer that.
Christian
The tragedy of cyberspace - that so much can travel so far, and yet mean so little.
And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002
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Christian Graus wrote:
So it's James screensaver now ?
ROTFLMAO
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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hi Nish!
what do you mean "ROTFLMAO"?
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zhoujun wrote:
ROTFLMAO
Rolling On The Floor Laughing My Ass Off!
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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haha!Nish!
that's interesting!
sorry i make you laugh your ass off!
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zhoujun wrote:
that's interesting!
sorry i make you laugh your ass off!
It's a universally used chat acronym 
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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thanks Christian!
because i am from non-speaking english country,
so the long names of you always make me confuse.
so i call James's screensaver instead of Christian's and James's screensaver for simpleness,sorry!
by the way what is the meaning of "AFAIK"??
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zhoujun wrote:
by the way what is the meaning of "AFAIK"??
As Far As I Know
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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hi Nish.
you are so kind to reply to me promptly.
i admire you,even begin to worship you.![Rose | [Rose]](https://www.codeproject.com/script/Forums/Images/rose.gif)
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zhoujun wrote:
you are so kind to reply to me promptly.
i admire you,even begin to worship you.
no probs
Nish
Regards,
Nish
Native CPian.
Born and brought up on CP.
With the CP blood in him.
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zhoujun wrote:
so i call James's screensaver instead of Christian's and James's screensaver for simpleness,sorry!
No problems - I don't actually mind, I was just kidding.
Christian
The tragedy of cyberspace - that so much can travel so far, and yet mean so little.
And you don't spend much time with the opposite sex working day and night, unless the pizza delivery person happens to be young, cute, single and female. I can assure you, I've consumed more than a programmer's allotment of pizza, and these conditions have never aligned. - Christopher Duncan - 18/04/2002
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zhoujun wrote:
2,Rama said "RBWRP.dll - This is a Managed C++ application that links with Ravi Bhavnani's WebResourceProvider libary to obtain Code Project Top 10 posters."
My screen saver can display different types of data
1. Latest Articles
2. Latest Lounge Messages
3. Latest Comments and Questions
4. CP Top 10 Posters
In the next version you will also see
5. CP Top 10 posters of the week
6. Quotes By CPians
Items 1,2,3 can be obtained from the CP WebService.
Chris Maunder doesnot provide any means to obtain Item no 4 This is where Ravi Bhavnani's WebResourceProvider comes into picture. If you see Ravi's article he has a demo of obtaining Top 10 posters. I use his code as it is and write a managed wrapper around his class. My screen saver talks to this managed wrapper and obtains the information.
RBWRP.dll is already linked with WebResourceProvider.lib so you don't have to do anything. Look at the solution RBWRP.sln and it would be clear. I am going to write a detailed articles on various aspects of screen saver. I think the screen saver is a good practical example to demonstrate various .NET features.
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thanks Rama.
but if i am not bothering you,
can you tell me more about how do RBWRP.dll link with webresourceprovider.lib?
in Ravi Bhavnani's WebResourceProvider demo,
i can see from the project's property that the demo is linked with webresourceprovider.lib!
thanks!
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i want to get information about how to build up a web application step by step,
not a sample web application that is very simple,
but a complicated one such as a portal website or e-commerce website.
i mean detailed information about how to establish such websites step by step.
i think many people like me who is not much familiar with asp.net will want to have such informations in order to get a whole impression about vs.net.
so experienced cp's programmers,please give us some cues on how to find such resources.
thanks in advance!
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You can look at http://www.asp.net/
There is a really good sample there about IBuySpy portal. Look at that it really good.
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yes,that's a great sample.
but to your experience,are there any resources that's introducing the design of websites from the beginning?
thanks!
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I haven't heard much about .NET Windows Forms applications that run inside of a web browser like ActiveX controls or Java Applets. Does anyone have any pointers to books or web sites that cover this in depth? Basically I want to replace our existing application (HTML + ActiveX controls) with C# Windows Forms. I assume there is some way of packaging assemblies in CAB files but I just haven't heard much about this. Thanks!
Chris Hafey
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I am trying to do something similar. I was told by someone at MS that remoting might be a good way to go about it. SOAPSUDS seams to not like forms, so that is out of the question. Unfortunately, you have to send the user an exe and possibly a DLL and make sure that he has the .NET framework. If you can find a better way of doing this, I'm open to suggestions.
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Check out http://www.gotdotnet.com/compare/windowsforms/iesourcing.aspx
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try
{
AccountTable = AccountDb.Tables["Accounts"];
if (AccountTable == null)
throw (new NullReferenceException());
}
catch (NullReferenceException)
{
// Table not present, create empty DB
AccountDb.Clear();
CreateEmptyDataBase();
}
Take a look at that if check. It passes even if AccountTable is NOT null. I checked with the debugger, it's NEVER null, but the if check always passes. The if check behaves fully correctly if I remove the try/catch statement.
That sounds broken to me, I have a hard time imagining this "feature" is by design  Any ideas ?
greetings,
Tim
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Hmmm...
Looks like that WebService debugging is VERY unreliable. Actually the code is executed correctly, just the debugger displays crap.
if I write
if (obj == null)
{
SomeStatement()
throw SomeException
}
it falsely executes the if, skips SomeStatement, executes SomeExcpetion, but doesn't actually throw it. That's f***ed if you ask me
Rebuilding app / restarting IIS doesn't help. There are also countless other cases were wierd stuff happens. Normal C# debugging works perfect
Sigh, looks like we have many many service packs ahead of us until this works...
greetings,
Tim
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