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Why couldn't you simply download vs2005 beta2 express ?
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In a project I'm developing, I need to duplicate the functionality of the Display Properties -> Screen Saver tab. Most importantly, I'd like to list the screensavers the person has installed on their computer, complete with descriptions. I know that screensavers are usually located in the "%windir%\system32\" folder (Usually C:\Windows\System32), but is there a possibility that a screensaver that's available in this list could be located elsewhere on the system? If so, then what method can I use to reliably list the screensavers available?
I've searched through the registry, and there don't seem to be any keys that I can enumerate to give me a list. The other problem I'm encountering is that I can't seem to locate the "title" of the screensaver. I assumed it would be visible through FileVersionInfo.GetVersionInfo, but that doesn't seem to be the case (unless I'm blind).
Can anybody point me in the right direction here?
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Yep it just lists the *.SCR files that impelement the screen saver entry points.
PeterRitchie.com
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But how can I extract the "title" of the screensaver to list them on my form? I'd like to use the same display title as the Display Settings window uses, if that's possible - I assume you have to be able to find that somewhere, since Windows does it.
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The string resource with ID 1 is used as the title to display in Display control panel applet.
PeterRitchie.com
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I guess I'm missing it here, but how do I extract a resource from another EXE file? Is there some code available to do this rather simply? Either VB or C# will do. Thanks for your help!
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.NET doesn't have support for Win32 resources. You have to pinvoke LoadStringW from kernel32.
A little helper class:
using System;
using System.Runtime.InteropServices;
using System.Text;
namespace PeterRitchie
{
[ComVisible(false)]
sealed class Helper
{
[DllImport("kernel32.dll", CharSet=CharSet.Auto)]
private static extern IntPtr LoadLibrary(string lpFileName);
[DllImport("user32", EntryPoint="LoadString")]
private static extern int LoadStringW(int hInstance, int wID, [Out] StringBuilder lpBuffer, int nBufferMax) ;
public static void LoadString(String ModuleFilePathString, int ID, ref String LoadedString)
{
IntPtr InstanceHandle = LoadLibrary(ModuleFilePathString);
StringBuilder BufferString = new StringBuilder(1024);
LoadStringW(InstanceHandle.ToInt32(), ID, BufferString, BufferString.Capacity);
LoadedString = BufferString.ToString();
}
}
};Sample usage:
using PeterRitchie;
string LoadedString = "";
Helper.LoadString(@"C:\windows\system32\ssbezier.scr", 1, ref LoadedString);
Debug.WriteLine(LoadedString);
Enjoy!
PeterRitchie.com
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Using .NET CF does anyone know if its possible to get an objects instance name.
ie the variable name. I want to serialise a bunch of objects and it would be nice for each to include its nme with data to allow better versioning
eg
<br />
class MyObject<br />
{ .....<br />
<br />
public Write ( TextWriter tw)<br />
{<br />
tw.Write( this.GetType().ToString() );
tw.Write( this.GetMyInstanceNameIfPossible );
}<br />
So I can later do
<br />
MyObject.Write( writer );<br />
This way when I read it in I can decide what variable to init. rather that rely on the order the data was written out.
I know I can just manually write the name, but this would be automatic and less prone to error.
Thanks
.nuetter
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Are you asking how to get an instance variable's name? For instance, if I wrote:
public void DoSomething()<br />
{<br />
string myFoo = new FooType();<br />
}
would you want to know, at serialization time, that the variable name was 'myFoo'? If so, what advantage does that provide?
In any case, I don't think that's possible at runtime. A quick look at the ILDASM (Intermediate Language) representation of the class above makes it clear that locally scoped member variable names are discarded in the compilation to IL.
It is probably important to note that the names of field-level variables, method names etc., whether public or private, are preserved during compilation, so technically you could use reflection to get the names.
However, if your class(es) implement the ISerializable interface (as opposed, or in addition to being marked with [SerializableAttribute]), then you are free to develop your own serialization and deserialization plans for the class(es). The ISerializable interface exists to deal with just this kind of issue (provide developers with a way to prevent deserialization exceptions caused by versioning), among other things.
Hope this helps.
The most exciting phrase to hear in science, the one that heralds the most discoveries, is not 'Eureka!' ('I found it!') but 'That's funny...’
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You would have to manually parse the debugging information; which, of course, does not exist in release builds.
The best you could hope for is the address (using the &[^] Operator in an unsafe[^] context).
PeterRitchie.com
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Hello,
I am trying to fix a memory retention problem for the statement
'return Bitmap.FromStream(new MemoryStream(buffer)) as Bitmap;'.
Since 'new MemoryStream(buffer) is created within the return, it does not release the memory.
I tried the following, but it does not return the Bitmap
using( MemoryStream ms = new MemoryStream(buffer) )
{
return Bitmap.FromStream( ms ) as Bitmap;
}
Any ideas on how to fix the memory retention problem
Thanks in advance
Robert
//////////////////// Code \\\\\\\\\\\\\\\\\\\\\
private Bitmap GetBitMapFromFile( string imageFileName )
{
byte[] buffer = null;
Stream stream = null;
try
{
stream = new FileStream(
imageFileName, // String Path
FileMode.Open , // FileMode
FileAccess.Read , // FileAccess
FileShare.Read , // FileShare
4096 , // bufferSize
true ); // useAsync
buffer = new byte[stream.Length];
stream.Seek(0,SeekOrigin.Begin);
stream.Read(buffer,0,(int)stream.Length);
}
catch( )// make simple for posting
{
}
finally
{
if( stream != null )
{
stream.Close();
}
}
// Memory Retention 
// The new MemoryStream cause memory retention
return Bitmap.FromStream(new MemoryStream(buffer)) as Bitmap;
}
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You could try making a copy of the Bitmap and returning the copy.
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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Hi,
how do you know the memory isnt released? Have you just looked at the task manager? You have to keep in mind that the GC runs very unregulary. Ive tested you code in a for loop over somehundred images. Its true that at first the memory rises constantly but at some point it reduces itsself automatically to a normal level.
If you want to avoid this you can use GC.Collect() to manually start the garbage collector.
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I am using SciTech's NetMemProfiler2 to locate undisposed memory. Since the method is part of must large soultion, I was trying to locate any problems in the area that the NetMemProfiler pointed me to.
I will take a look at the method that calls to this methos and sees what it does with the bitmap.
Robert
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The Fix:
The bitmap was being stored in another class.
The code was written as:
GetBitMap.getbitmap(<information>).Paint(g);
Rewrote the code as:
GetBitMap newClass = GetBitMap.getbitmap(<information>);
newClass.Paint(g);
newClass.Clean(); // remove bitmap from memory
The actual code is a bit more complex than the above example.
The code was written by another software company.
Robert
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rlinder wrote:
// Memory Retention
// The new MemoryStream cause memory retention
return Bitmap.FromStream(new MemoryStream(buffer)) as Bitmap;
}
can be:
dim MS as new memorystream(buffer)
dim BM as bitmap = bitmap.fromstream(ms)
ms.close
return bm
}
sorry its VB code 
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I am using Visual Studio.net 2003 with the bundled Crystal Reports. I want to use a selection formula to select data based on the current value on my form. At the moment I have a dataform which has datafields and text boxes on it together with a cyrstal reports viewer. I have a text box called txtYEID on my form and a corresponding field in my database (and thus shown on my Crystal Report) called anuYEID. The selection formula I have at the moment is:
Dim myformula As String
myformula = "{tblYearEnd.anuYEID}" = "& chr(39) & txtYEID.Text & chr(39)"
CrystalReportViewer1.SelectionFormula = myformula
However when I trigger the code my CRViewer doesn't show any data! I've done messagebox.show on both txtYEID and anuYEID and the first shows the current data, but the second is blank - which I presume means it isn't passing the data to the field???
Once I've acheived this (if ever...) I want to separate the data form from the CR viewer so that they are both on different forms, but when I open the data form and select certain data, when I click a button to open the form with the viewer it will only show my current data - is this possible?
Any help would be gratefully appreciated
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I realised there was an error in my formula and have corrected it to show as:
Dim myformula As String
myformula = "{tblYearEnd.anuYEID} = " & Chr(39) & txtYEID.Text & Chr(39)
CrystalReportViewer1.SelectionFormula = myformula
The mssagebox.show results are still the same and my code now triggers the error that anuYEID requires a number - so I guess it still not passing the number from one box to the other.
I would appreciate any help
thanks 
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form numbers
CrystalReportViewer1.SelectionFormula ="{Customer.Cust_No } = " & CInt(txtCustNo.Text)
for string you have to use
CrystalReportViewer1.SelectionFormula ="{Customer.Cust_Name } = ' " & CInt(txtCustNo.Text) & "'"
James Kennelly
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Thanks for your help - really appreciated
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Does anyone know how big a .NET app can be. I'm interested, if there is a limit of the size of an application ..
for example, assume that there is no hardware limit - there are few/enough GBs of RAM (if not, the os will use the virtual ram) - available .. and now i'm filling in a for loop (for example) an array ...
Does there exist any limit or restrictions which are known or defined, other then "not enough RAM or similar"?
Im interested if the app will "crash" after it becomes bigger then (for example) 1GB?
Does anyone know that? If not, what is the best way to check it?
Im not sure if that above is clear enough, but i hope it is.
I'm thankful for every answer! 
denis
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I'd say you'll never reach the limit if there's one, so why bother? 
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Depending on what your doing and using, an array has an index limit of 2,147,483,647 on a 32-bit processor...
RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome
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As any process also .NET apps have some limitations in size.
On an normal Windows (not 64 bit) this limit is somewhere beyond 1 GB (in one of my projects I needed an decimal array with 80 million elements and I still know it was very near to the limit).
This is even simple to check: Just make an test app and create some kind of big array and make it bigger until the OutOfMemoryException comes
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maybe i'll write an app to test this.
thanks@all
denis
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