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I have a badge printing application (done in C#) that uses Cyrstal Reports to print plastic badges.
Now I am required to do encoding on the badge's magnetic strip. In the past I have done this by sending printer command codes directly to the printer. These command codes must be sent in the same printer job as the Crystal report. Is it possible to incorporate printer command codes into a Crystal report? Can this even be done?
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i have an external console program that converts one filetype to another and it only accepts the arguments like this:
program.exe "file1" "file2"
if i have the filenames store in vars file1 and file2 how do i create a string so that i can use the System.Diagnostics.Process.Start function? i've been trying to create a string like this:
"program.exe" "file1" "file2"
that way i can use the function but it doesn't work because the string automatically puts in '\\' when ever there's a '\' and it puts in '\"' when ever i have a '"'. how can i format it so it's more like a filename?
please help,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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static void Main(string[] args)
{
if (args.Length == 2)
Process.Start("program.exe",
string.Format("\"{0}\" \"{1}\"", args[0], args[1]);
}If you're looking at this in the debugger, the VS.NET automatically escapes those strings, which explains why you see \\ in place of \, and \" in place of ". You need to do this when you define your own strings in code (unless prefixed with the literal character - @ - in which case you only need to escape the double quotes - ").
Microsoft MVP, Visual C#
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thank you very much. with your help i was able to get that portion of my program working. i did notice the @ symbol in the debugger but i didn't know what it was there for, now i know.
thanks,
Rob Tomson
--
There are 10 kinds of people. Those who understand binary and those who don't.
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how to access web service with SSL from windows application (C#)?
How to use the certificate in the client windows application/
Is there any sample available?
Thanks a lot.
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You don't need to do anything - just use a URL with the HTTPS scheme when creating the web service proxy. If you want to pass a client certificate, you can add it to the ClientCertificates property that all web services proxies inherit from their base class, HttpWebClientProtocol. For more information and an example, see the ClientCertificates[^] property documentation in the .NET Framework SDK.
Microsoft MVP, Visual C#
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I am sorry if this question has aleady been asked.
I need a recursive fucntion for populating a multi-level (3-4 level) treeview. Also comment on the DataSet layout to be passed to this fucntion.
Thanks,
Ruchi 
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You need to make sure that a parent/child relationship exists in the DataSet, like:
ID ParentID Text
--- --------- -----
0 (null) Node1
1 0 Node1_1
2 0 Node1_2
3 2 Node1_2_1
4 3 Node1_2_1_1 The first method of your function must get the root nodes by getting those with a ParentID that's null (DBNull):
public void BuildTree()
{
DataSet ds = GetDataSet();
DataRow[] rows = ds.Tables[0].Select("ParentID = NULL");
treeView1.BeginUpdate();
for (int i=0; i<rows.Length; i++)
{
TreeNode node = new TreeNode();
node.Text = (string)rows[i]["Text"];
node.Tag = rows[i]["ID"];
this.treeView1.Nodes.Add(node);
BuildSubTree(node, ds);
}
treeView1.EndUpdate();
}In your actual recursive function, you could do something like this:
private void BuildSubTree(TreeNode parent, DataSet ds)
{
int id = (int)parent.Tag;
DataRow[] rows = ds.Tables[0].Select(string.Concat("ParentID = ", id.ToString()));
for (int i=0; i<rows.Length; i++)
{
TreeNode node = new TreeNode();
node.Text = (string)rows[i]["Text"];
node.Tag = rows[i]["ID"];
parent.Nodes.Add(node);
BuildSubTree(node, ds);
}
}This is just a simpe example and can be greatly improved through the use of typed DataSet classes with defined DataRelations, which provide a faster way to get children using DataRow.GetChildRows. This should be enough to get you started.
Microsoft MVP, Visual C#
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Hey
Is there any simple way to force the vertical scroll to display always na not onlye when there is to much items??
The ListBox have somthing like force vertical scroll.
//Jimmy
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This was just asked earlier today, and the answer was to search the C# forum (click "Search comments" above). This has been answered many times. You must P/Invoke the SendMessage native function and pass the WM_VSCROLL message with the correct parameters. Documentation for this function and message can be found in the Platform SDK.
Microsoft MVP, Visual C#
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Hi guys,
Anyone have an idea on how to use multiple backbuffers with DirectDraw 9.0 using the Managed version with C# ?? On the SurfaceDescription class, there is a member named: BackBufferCount. So it must be possible to do that! Unfortunately, the only sample I can found on the internet is using only 1 back buffer!
Thanks again!
Jean Bédard 
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It is possible, yes. I've been reading a book that someone sent me that covered this in the first or second chapter briefly (and will discuss it more later, when I get time to finish it). It's written by one of the program leads (can't remember exact title) of DirectX and is a very good book (one of the best I've read, though I read very few - I'm an SDK kind of guy, but the Managed DirectX docs stink). It's Managed DirectX 9 Kick Start: Graphics and Game Programming[^] and is available at many merchants' sites, including Amazon (the link).
Microsoft MVP, Visual C#
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Thanks, I've just ordered the book on Amazon. Pretty cheap also!!
Jean Bédard 
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You set the BackBufferCount equal to the number of backbuffers you want e.g. 2 if you want 2 backbuffers.
I have some questions of my own: How do you find out the maximum number of backbuffers possible (that should be dictated by your graphics card memory + RAM)? How do you find out how much memory the graphics card has and how much RAM you have? If you figure out the answers pl. email me at fd97207@yahoo.com
BTW the DX kick start book just has one chapter on ddraw so not very useful as far as ddraw is concerned. See
http://www.cse.unsw.edu.au/~atan164/ddraw_print.html for a good tutorial .... in VB 
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Is CObArray and CObList the equivalent of a collection under .NET? I want pass data from one form to the other and then into a control. Can I create a class, add them to the collection, pass it and then fill the control? This in in ASP.NET btw...
Thanks
Ralph
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ASP.NET is really no different from CGI in the world of HTTP. You can't really send a collection from form to form - you need to use POST data just like form elements in a page. You could store the collection in a session variable, but you'll take big performance hits if you don't clean it up correctly.
I'm not really sure what those objects are, but they appear to be an array and a list. Lists are those classes that implement IList (and inherit ICollection and IEnumerable). Arrays implicitly derive from System.Array, which implements IList. So, they're both lists (but you can't use some methods from the aforementioned interfaces with an array - it's still a fixed number of elements).
You could serialize this collection and base64-encode it, then make sure it gets sent with your form data to the next page, deserializing it. If you're remaining on the same page (i.e., using post-back), you could also extend the Page class (your .aspx and code-behind files do this already) and override SaveViewState and LoadViewState to save this serialized collection, but this only works if using post-back with the same page. You should definitely read the documentation on those two methods - implementing them can be tricky, especially if you don't know what you're doing.
Microsoft MVP, Visual C#
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The only way to pass data between forms is using Session, isn't it ?
Free your mind...
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No, it's not the only way. Any data defined as an input for the page form can be sent to another page, which can retrieve it using Request.Forms (POST), Request.QueryString (GET), or Request.Params (both). How do you think CGI has worked since it was proposed? This data doesn't have to be input by the user - it can simply be in a hidden input field. The developer just has to make sure it gets in there before the GET or POST request is sent to another page (since that data is sent from the client to the new page).
Microsoft MVP, Visual C#
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I know that this is not the only way to share info between forms. I've done some ASP and CGI.
I didn't explain myself with the question...
I meant, is that the only way to do it using ASP.NET ?
Free your mind...
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Well, besides sessions and and form data (thus meaning that sessions still aren't the only way in ASP.NET), you could always store it in a repository of sorts, like a database, file (bad!), cookie, etc. The nice thing about using a session is that the original poster wouldn't have to serialize the collection and could just store it in the session as-is. Sessions can be very nice, but they are often over-used (especially when large amounts of data are stored in them).
As I mentioned before, too, if you use post-back and stay on the same page (seems to be most common with ASP.NET), you can use the ViewState but the page implementation is responsible for saving and loading that ViewState (and one must be careful when doing so).
Microsoft MVP, Visual C#
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Hii
I want to make a text box which only accepts numbers. If any other key is pressed then it is discarded.
In VB6 it's done in somewhat like this .. on the KeyPress event we check if KeyAscii < '0' or KeyAscii >'9' then KeyAscii = 0
How can we implement this thing in C#
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You can use KeyPressed event handler:
<br />
void textbox_KeyPressed(Object o, KeyPressEventArgs e)<br />
{<br />
if(e.KeyChar < '0' || e.KeyChar > '9')<br />
e.Handled=true;<br />
}<br />
<br />
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There are several ways to do this. One way is to do an override of the Form's ProcessDialogKey method:
protected override bool ProcessDialogKey(Keys keyData)
{
if(this.textBox1.Focused)
{
char c = (char)keyData;
if(!char.IsNumber(c))
return true;
}
return base.ProcessDialogKey (keyData);
}
The graveyards are filled with indispensible men.
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I am interested in creating parsers, but I cannot find anywhere a decent site or book that explains this. I have found some info about top-down and bottom-up parsers, but I would like more details, differences and a good tutorial. Any help would be highly appreciated. Thanks a lot.
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You can find some info on antlr page which is a really good parser generator tool for C#:
http://www.antlr.org
I have few examples on my web page on using antrl: http://www.adersoftware.com/?page=compilers
I have also an example there that doesn't use parser generator, but uses hand coded top-down recursive descent parser.
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