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Help! I got stuck at the moment.
First I tried to change the registry value with:
RegistryKey key = Registry.CurrentUser.OpenSubKey( "Control Panel\\Desktop" );
if (key==null) listBox1.Items.Add("--- Key not there!");
else
{
listBox1.Items.Add(key.GetValue("Wallpaper"));
key.SetValue("Wallpaper","C:\\test.bmp");
}
With GetValue I get the correct actual Wallpaper-filename, but when trying to write with SetValue I get a System.UnauthorizedAccessException "Cannot write to the registry key"
----------------------------------------
Then I tried to call the Windows API function with:
[DllImport("user32.dll")]
public static extern bool SystemParametersInfo (long uiAction, long uiParam, string pvParam, long fWinIni);
(..)
bool ReturnValue=false;
ReturnValue=SystemParametersInfo(0x0014,0,"C:\\test.bmp",0x0002);
After the call, the ReturnValue is true and the screen updates (flashes). But the desktop-wallpaper is still the same.
The Bitmap "C:\\test.bmp" exists
Any idea?
Mario 
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Change all your longs to uint. You're passing 64bit values to a function that's expecting 32bit.
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Thanx!
It works perfectly now (you immediately see the result). So for all who want to change the desktopwallpaper, the "final" code is:
[DllImport("user32.dll")]
public static extern bool SystemParametersInfo (uint uiAction, uint uiParam, string pvParam, uint fWinIni);
ReturnValue=SystemParametersInfo(0x0014,0,"FILENAME",0x0002);
Mario
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I need to generate pdf dynamically, programmatically from an ASP.NET web form. I use C# for the code behind. I retrieve data from a SQL server database. I need to let a user on my web application have the option of generating a pdf document with this data, save it on a local drive or path of choice, and view it.
Thank you in advance..
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I think Crystal Reports which comes with VS Enterprise Architect has PDF export functionality
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Thank you. i will look into that..if u know any of the specifics involved in exporting CR to pdf do let me know..thanks a bunch..
Thank you in advance..
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Check this out:
http://sourceforge.net/projects/pdflibrary/
It's officially in BETA, but I've been using it in one application for a little while now without problems.
Andrew Connell
IM on MSN
andrew@aconnell.com
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I have tried using the project u mention. It currently generates a single page pdf document. I was not able to figure out how to make multi page pdf documents with it..have u had any success in this regard??when i tried adding more text than a single page could hold it kind of ran out of the page..how do i tweak or add to the code to make it generate as many pages as necessary to hold the data??if you could please help me on this matter..i appreciate your time..
Thank you in advance..
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Hmmm... never had the need... all my reports are one page. If I uncover anything I'll keep you informed.
Andrew Connell
IM on MSN
andrew@aconnell.com
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Thank you...I appreciate your help and time..
Thank you in advance..
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I'm trying to serialize a number of simple classes over socket, and it seems to work pretty good locally. I connect to the server, which sends me a simple text, which client prints, then I go into a loop on both sides where client initiates requests by creating objects of type "Request" (which I have defined) and serializing them over the socket.
The server then deserializes them, and creates an object of type "Response", which it then serializes back.
It all work very well, until I try connecting _from another machine_.
I get a connection, but the data just isn't sent (from server to client. I manage to send data from the client to the server).
I've tries serializing to memory and then sending the socket, but it seems to be incompatible (somehow) with just using a plain binaryformatter onto the networkstream.
Here's the server code:
private void SendResponse(Response p_response)
{
try
{
BinaryFormatter t_binaryFormatter = new BinaryFormatter();
NetworkStream t_networkStream = new NetworkStream(m_socket);
t_binaryFormatter.Serialize(t_networkStream, p_response);
}
catch (System.Exception e)
{
m_app.log(e, this);
}
}
(Works well locally, but not from another machine, both doing TCP/IP).
Alternative server-code:
private void SendResponse(Response p_response)
{
try
{
BinaryFormatter t_binaryFormatter = new BinaryFormatter();
MemoryStream t_memoryStream = new MemoryStream();
t_binaryFormatter.Serialize(t_memoryStream, p_response);
m_socket.Send(t_memoryStream.GetBuffer());
}
catch (System.Exception e)
{
m_app.log(e, this);
}
}
Works well even remotely for the first request, but after that I get this exception (in the client):
Exception: Binary stream does not contain a valid BinaryHeader, 0 possible causes, invalid stream or object version change between serialization and deserialization.
It seems there is superfluous data sent from the server when using the MemoryStream.
Any pointers? Thanks in advance.
Ideally, I would want to get it to work without using the MemoryStream.
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Hello,
I got this weird problem when checking and unchecking boxes. I am developing a backup program that works every similar to Backup Exec with a add'l features. If you select a directory (folder) to be backed up it seems to run through a constant loop until all the files and folders associated with that directory have been filfilled. Does anyone have sample that they might be able to supply me to use so that I can get this to work correctly? I would really appreciate it. Thank you.
cAptHiDDeN 
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Hello all, I am having a bit of a problem with databases. Right now I have an application that stores data into an access database. But when the database goes over 2 gigs the application crashes out and it starts over writting the header file. Please give me some suggestions with using other database collectors, that would be a great help. Thanks
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DO you use Access or SQL?I think Access has some limitation for size of database.SQLServer is more trustable for large database.
Mazy
"If I go crazy then will you still
Call me Superman
If I’m alive and well, will you be
There holding my hand
I’ll keep you by my side with
My superhuman might
Kryptonite"Kryptonite-3 Doors Down
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This is happening because Access limits the database size to 2 gigs. You might try archiving, I don't know if thats easy in access or even possible in your application. The long term solution is to migrate to SQL server. It's relativly I easy I think(I have not done this in a production setting so I am not sure how well this works).
Steve
Not all who wander are lost...
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Hi,All
I want to Drag a node from TreeView1 and drop it to TreeView2,For that i do like this:
private void treeView1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
treeView1 = (System.Windows.Forms.TreeView )sender;
System.Windows.Forms.TreeNode tn = = new System.Windows.Forms.TreeNode();
tn = treeView1.GetNodeAt(e.X,e.Y);
if(tn != null)
treeView1.DoDragDrop(tn.Text ,DragDropEffects.Copy | DragDropEffects.Move);
}
AllowDrop Property of Treeview2 is set to true.
private void TreeView2_DragDrop(object sender, System.Windows.Forms.DragEventArgs e)
{
MessageBox.Show("In DragDrop");
}
But when i Drop it on TreeView2 it does'nt come in DragDrop Event.
also when i drag the node from TreeView1 it shows a symbol(Line inside circle),means Draging not allowed!
What else i should do to drag and drop node?
thanks in advance
Tushar.
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Hi Tushar,
I think you need to add an event handler for the DragOver event on TreeView2 to signal that you are ready to handle the drop. Try this:
private void treeView2_DragOver(object sender,System.Windows.Forms.DragEventArgs e)
{
e.Effect=DragDropEffects.All ;
}
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My program "A" connect to a database, and write data to a xml file.
///////my code
this.myDataSet.WriteXml("test.xml",XmlWriteMode.IgnoreSchema);
StreamWriter xmlsw = new StreamWriter("test.xml",false);
this.myDataSet.WriteXml(xmlsw,XmlWriteMode.IgnoreSchema);
xmlsw.Close();
///////
And I have another program "B" will access test.xml every 30 sec. Sometime the program "A" will cause an unhandled exception like this:
//error message
An unhandled exception has occurred in your application. If you click Continue,the application will ignore this error and attempt to continue. If you click Quit, the application will be shut shut down immediately.
The process cannot access the file "test.xml" because it is being used by another process.
/////
My question is :
1. How can I check the file is access by another program before writing data to this file.
2. Or, How can I ignore this message automatically.
thanks.
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You can trap the exception
try
{
//unstable code here
}
catch(Exception ex)
{
//whatever you want to do when there is an exception.
}
Just an example.
Andres Manggini.
Buenos Aires - Argentina.
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I am interested in accessing and manipulating the position of the icons on the desktop. I am also interested in how to dock a window to the outside edge of the desktop. If anyone can help me on either of these topics it would be greatly appreciated.
Thanks...
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Has anybody purchased Inside C# from Amazon UK recently. I want to get the second edition (already owning the first), but the one on Amazon seems to still be the first edition.
I'm assuming this is a web-site c**k-up but don't want to risk buying something I already have.
Michael 
Look, try and use your intelligence, man, even if you are a politician. - The Doctor
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Well, I just checked Amazon.com and it ships the 2nd edition... Do you have to go through Amazon UK or can you grab it from Amazon.com?
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They will create a new record for the 2nd ed, and they may be holding on to it until stocks of the first sell out.
Christian
come on all you MS suckups, defend your sugar-daddy now. - Chris Losinger - 11/07/2002
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If anyone has a very good C# book to recomment, please let me know. I don't want something that takes me by the hand (altough OOP principles and the philosophy behind Windows\Web Services programming would be nice...). I know my way around although I've never really touched C++ before (mainly Javascript, Perl, ASP and PHP).
Also, are C# and VC++ really different? If yes, I guess I'd like suggestions on good VC++ books too!  Is there a big difference between the VC++ for Visual Studio 6 and Visual Studio .NET? Thanks!
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Inside C# by Tom Archer is a very good book. I have the first edition but the second edition is supposed to be better.
Visual C++.NET Step-by-Step is also a good book for learning how to program .NET under C++.
Michael
Look, try and use your intelligence, man, even if you are a politician. - The Doctor
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