Hanging web request - C# Discussion Boards

Re: Beginner C# questions

18-Sep-02 23:38

beginner_vivian wrote:
3) Any links to make good forum/messageboards using C#?

http://www.codeproject.com/script/comments/forums.asp?forumid=1649[^]

beginner_vivian wrote:
1)What is the command to read int, double or other variables using microsoft
Library?

Can you expand?

beginner_vivian wrote:
2)Anyone got good source codes(c#) for doing interactive forum using C#?

I'm still looking too...

James T. Johnson19-Sep-02 0:06

James T. Johnson

19-Sep-02 0:06

beginner_vivian wrote:
What is the command to read int, double or other variables using microsoft
Library?

Reading from where?

If you mean from the command line use Console.ReadLine to get a string representing what was typed (excluding the new line character(s)).

Then use the Convert classes to convert them to the type your are looking
for (you may have to parse the string to ensure it is what you think it is).

beginner_vivian wrote:
Anyone got good source codes(c#) for doing interactive forum using C#?

You mean a forum that is written with C# and that you can use on your website?

Microsoft has released the source to its ASP.NET forums[^], oddly enough on the ASP.NET forums page.

beginner_vivian wrote:
Any links to make good forum/messageboards using C#?

Just the one above Wink | ;)

James
"And we are all men; apart from the females." - Colin Davies

Re: Beginner C# questions

leppie19-Sep-02 0:31

Managed interface for IActiveDesktop

19-Sep-02 0:31

James T. Johnson wrote:
ASP.NET forums

Nice link Smile | :)

DataGrid

vikramlinux18-Sep-02 18:03

vikramlinux

18-Sep-02 18:03

I am using Datagrid. In some columns I used comboboxxes and in rest textboxes by handling events . That meant I am placing the combobox ot text box on mouse click to appropriate cell.Here I want to avoid sorting.But even if I set allowsort property to false if not works.What can be the possible problem ? Confused | :confused:

VikramVS

Hanging web request

afronaut18-Sep-02 13:23

afronaut

18-Sep-02 13:23

Hey all - I'm trying to get an RSS feed using the System.Net.WebRequest class:

<br />
/* <br />
using System.Net;<br />
*/<br />
WebRequest requ = WebRequest.Create(feed);<br />
Stream instream;<br />
WebResponse result = requ.GetResponse();<br />
instream = result.GetResponseStream();<br />
StreamReader reader = new StreamReader(instream);<br />
String code="";<br />
while(code != null){  // <-- hangs in this loop<br />
code+=reader.ReadLine();<br />
}<br />

Unfortunately, it is hanging in my loop that retrieves all the text from the URL. Is there a better way to read all the text out of a feed? Also, does anyone know why it is an endless loop?

*->>Always working on my game, teach me
*->>something new.
cout << "dav1d\n";

Re: Hanging web request

Paul Riley18-Sep-02 13:31

Paul Riley

18-Sep-02 13:31

How is code ever going to be null if you're adding to it all the time?

You have to read into a temporary string, check for null and if it's not then add it to code. Alternatively, replace the entire loop with code = reader.ReadToEnd().

Paul

Re: Hanging web request

afronaut18-Sep-02 13:32

afronaut

18-Sep-02 13:32

As usual, I find an answer for everything I post for in moments. The StreamReader has a ReadToEnd method that can be used to get the entire contents of an InputStream.

I guess I'll leave my original post in case anyone else runs into something similar.

Big Grin | :-D

*->>Always working on my game, teach me
*->>something new.
cout << "dav1d\n";

Re: Hanging web request

afronaut19-Sep-02 5:24

afronaut

19-Sep-02 5:24

ARGGH! I just saw my original mistake. Sometimes I'm such a lame programmer.

*->>Always working on my game, teach me
*->>something new.
cout << "dav1d\n";

Wjousts18-Sep-02 11:59

Wjousts

18-Sep-02 11:59

I've been trying to write a managed interface for IActiveDesktop so I can use it to change the desktop wallpaper from a C# program. My source as it is at the moment is shown below. When I try and use any of the methods in the IActiveDesktop interface I get exceptions being thrown, mostly System.NullReferenceException but sometimes System.ArgumentException. I suspect something is wrong with my managed interface, but I'm not sure what. I've played around with changing the marshalling, but haven't hit on the answer yet. Any help would be greatly appreciated. I know there are easier ways to change the wallpaper, but I'm determined to figure this thing out now!

Thanks

----------------------------
using System;
using System.Runtime.InteropServices;

namespace ShellTypeLib
{
// Component structures for IActiveDeskTop

[StructLayout(LayoutKind.Sequential)]
struct COMPONENT
{
uint dwSize;
uint dwID;
int iComponentType;
bool fChecked;
bool fDirty;
bool fNoScroll;
COMPPOS cpPos;
char[] wszFriendlyName;
char[] wszSource;
}

[StructLayout(LayoutKind.Sequential)]
struct COMPPOS
{
uint dwSize;
int iLeft;
int iTop;
uint dwWidth;
uint dwHeight;
int izIndex;
bool fCanResize;
bool fCanResizeX;
bool fCanResizeY;
int iPreferredLeftPercent;
int iPreferredTopPercent;
}

[StructLayout(LayoutKind.Sequential)]
struct COMPONENTSOPT
{
uint dwSize;
bool fEnableComponents;
bool fActiveDesktop;
}

[StructLayout(LayoutKind.Sequential)]
struct WALLPAPEROPT
{
uint dwSize;
uint dwStyle;
}

// Declare IActiveDesktop interface
[Guid("F490EB00-1240-11D1-9888-006097DEACF9")]
interface IActiveDesktop
{
void ApplyChanges(uint dwFlags);
void GetWallpaper([MarshalAs(UnmanagedType.LPWStr)] string pwszWallpaper, uint cchWallpaper, uint dwReserved);
void SetWallpaper(string pwszWallpaper, uint dwReserved);
void GetWallpaperOptions(ref WALLPAPEROPT pwpo,uint dwReserved);
void SetWallpaperOptions(ref WALLPAPEROPT pwpo, uint dwReserved);
void GetPattern([MarshalAs(UnmanagedType.LPWStr)] string pwszPattern, uint cchPattern, uint dwReserved);
void SetPattern([MarshalAs(UnmanagedType.LPWStr)] string pwszPattern, uint dwReserved);
void GetDesktopItemOptions(ref COMPONENTSOPT pco, uint dwReserved);
void SetDesktopItemOptions(ref COMPONENTSOPT pcomp, uint dwReserved);
void AddDesktopItem(ref COMPONENT pcomp, uint dwReserved);
void AddDesktopItemWithUI(IntPtr hwnd, ref COMPONENT pcomp, uint dwReserved);
void ModifyDesktopItem(ref COMPONENT pcomp, uint dwFlags);
void RemoveDesktopItem(ref COMPONENT pcomp, uint dwReserved);
void GetDesktopItemCount(int lpiCount, uint dwReserved);
void GetDesktopItem(int nComponent, ref COMPONENT pcomp, uint dwReserved);
void GetDesktopItemByID(uint dwID, ref COMPONENT pcomp, uint dwReserved);
void GenerateDesktopItemHtml([MarshalAs(UnmanagedType.LPWStr)] string pwszFileName, ref COMPONENT pcomp, uint dwReserved);
void AddUrl(IntPtr hwnd, [MarshalAs(UnmanagedType.LPWStr)] string pszSource, ref COMPONENT pcomp, uint dwFlags);
void GetDesktopItemBySource([MarshalAs(UnmanagedType.LPWStr)] string pszSource, ref COMPONENT pcomp, uint dwReserved);
}

// Declare ActiveDesktop as a COM coclass
[ComImport, Guid("75048700-EF1F-11D0-9888-006097DEACF9")]
class ActiveDesktop
{

}
}

namespace Wallpaper_test
{
class Class1
{
///

/// The main entry point for the application.
///

[STAThread]
static void Main(string[] args)
{
ShellTypeLib.ActiveDesktop MyDesktop = new ShellTypeLib.ActiveDesktop();
ShellTypeLib.IActiveDesktop IDesk = (ShellTypeLib.IActiveDesktop) MyDesktop;

IDesk.SetWallpaper("Test.bmp",0);
IDesk.ApplyChanges(1);
}
}
}

Re: Managed interface for IActiveDesktop

Stephane Rodriguez.18-Sep-02 20:44

Stephane Rodriguez.

18-Sep-02 20:44

I have randomly taken one method GetDesktopItemCount that wasn't working with your code, and got it to work thanks to slight modifications :

- declare this method as :

uint GetDesktopItemCount(out int lpiCount);

- use it :

int nbdesktops = 0;
uint hresult = IDesk.GetDesktopItemCount(out nbdesktops);

In other words, - IActiveDesktop is not a dispatch interface, so you must consume the HRESULT value in return. - out values are marshalled with the out attribute.

MS quote (http://www.microsoft.com/ddk) : As of September 30, 2002, the Microsoft® Windows® 2000 DDK, the Microsoft Windows 98 DDK, and the Microsoft Windows NT® 4.0 DDK will no longer be available for purchase or download on this site.

Re: Managed interface for IActiveDesktop

Wjousts19-Sep-02 15:50

Wjousts

19-Sep-02 15:50

With respect, that doesn't appear to be working either! I declared the GetDesktopItemCount as you did and then called in in my main program but I noticed that if I set nbdesktops to say 10 then after the function it is still 10! Also the HRESULT returned is non-zero even though no exception is thrown (it returns 0x129ADC which I don't know how to look up). Also what happened to the unit dwReserved parameter?
I declared the GetWallpaper function as:
uint SetWallpaper(string pwszWallpaper, uint dwReserved);
and it now seems to not throw an exception and even returns 0, but doesn't seem to actually do anything Cry | :((

. I suspect that nothing will happen until I call the ApplyChanges method but that one still isn't working Mad | :mad:

Re: Managed interface for IActiveDesktop

Okeno Palmer28-Dec-03 18:50

Okeno Palmer

28-Dec-03 18:50

Any luck with a solution for this problem? I would like to use the IActiveDesktop interface from a C# application as well.

I tried importing it via the Visual Studio method but I don't see the interface listed.

.:. Keno .:.

Release date of .NET 1.1?

leppie18-Sep-02 4:50

Web Service question (C#)

18-Sep-02 4:50

I found this article on GotDotNet about changes in ver 1.1 of the .NET framework.

Compatibility Considerations Between Framework Versions
[^]

I'm not sure when it appeared, but it has a "new" icon next to it.

I remmeber they said 4th quarter, maybe 24 September/October ? Laugh | :laugh:

User 988518-Sep-02 4:50

Web Service question (C#) - addl info

18-Sep-02 4:50

Apologies for reposting the question. I posted it first in the .NET forum. I am desperate to get an answer prompting me to post here again. Smile | :)

--------------------------
I created a .NET web service that was to be consumed by a .NET web application.

Now I have a problem. I made a session variable in the Web Service and stored the instance of the Web Service in a session variable in the Web application.

I have two problems
1. The session variable in the Web service is lost in subsequent calls.
2. The WebService object in the Web app session is NULL in every submit from the browser.

Have anyone implemented something like this? Is this the correct way to implement a state-ful Web Service?

Thomas

modified 29-Aug-18 21:01pm.

User 988518-Sep-02 4:55

18-Sep-02 4:55

The session management mode in the config file of ASP.NET is "inproc"

modified 29-Aug-18 21:01pm.

leppie18-Sep-02 4:57

18-Sep-02 4:57

Hi Thomas

I had exactly the same problem starting with web stuff a short while back and I was like WTF??*&^*&*%%&^(*& Laugh | :laugh:

are my objects?

The answer is short and sweet. In ASP.NET objects are stateless, meaning the will be recreated with every pageview.

Now the fix, and I'm not really sure if this the correct way, but all u need to do is mark those two variables in question as static. They will now retain their state.

Hope this helps Smile | :)

Ray Cassick18-Sep-02 5:20

Ray Cassick

18-Sep-02 5:20

leppie wrote:
Now the fix, and I'm not really sure if this the correct way, but all u need to do is mark those two variables in question as static.

I tried this once and could not get it to work.

I just wanted to test it out so I built a webservice that incrimented a variable by one each time it was hit.

The variable was always zero.

leppie18-Sep-02 5:59

18-Sep-02 5:59

Ray Cassick wrote:
I just wanted to test it out so I built a webservice that incrimented a variable by one each time it was hit.

Are you sure it was hit hard enough, maybe a 10 pound hammer will better Laugh | :laugh:

Ray Cassick wrote:
The variable was always zero.

That was the problem i had, before the object was marked static. Well it solved my problem...well, I wouldnt say it looks right, but it was my first try.

CHeers

User 988518-Sep-02 5:28

18-Sep-02 5:28

I found the answer:

On the line that says [WebService]

change to

[WebService(EnableSession=true)]

and it works!!!!

modified 29-Aug-18 21:01pm.

leppie18-Sep-02 5:53

18-Sep-02 5:53

WOW thanx, I need all the tips I can get Smile | :)

I think in my case static was the right answer, as the variable needed to have application scope and was started in the application started event and shutdown in the application end event.

It seems to work but with many problems. Normal builds didnt update the assembly on the webserver, so I have to do a Re-build every time. Not sure if this is normal Unsure | :~

Cheers

User 988518-Sep-02 6:39

18-Sep-02 6:39

Now the second part of my problem remains.

The web application starts a new session every time a web method on the WebService is called, even though I have created an instance of the Web Service in the Session_Start and kept it in a Session Variable.

Very unfortunate Frown | :(

Any ideas

modified 29-Aug-18 21:01pm.

leppie18-Sep-02 6:46