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It's Windows Application.
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Hello Everyone,
How can one detect if a printer is connected to the system or not.
I used the class System.Management.ManagementObjectSearcher class as follows :
System.Management.ManagementObjectSearcher searcher =
new System.Management.ManagementObjectSearcher("SELECT * FROM Win32_Printer");
the searcher.Get()returns printer objects even when not conneted to a printer. It detectes all printers that are installed on my computer.
and when the user clicks on Print (when offline) it throws an exception. How can I prevent this.
Can someone help me on this.
Thank you
-ZS
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Hi,
I have generated a report using Crystal reports. The crystal reportviewer displays the report.
so as to automatically print the report i have a statement :
crystalReportViewer1.PrintReport();
When this statement is executed the Printer dialog box appears. How can this be disabled using c#.
Thanks for your help in advance.
-jzelma
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Hi,
I am going to develeop an SMS module for PDAs. It will receive and send SMS messages. I will use OpenNETCF.Phone.Sms while developing this module.
I am looking for code samples and all kinds of sources that I can use.
Regards,
Sedso
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I am writing a diagnostic tool for our application. This tool has to display the list of various .NET Framwork versions installed.
How can I do this? Can I find this from registry or somewhere else?
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<br />
using Microsoft.Win32;<br />
<br />
GetRegValues("SOFTWARE\\Microsoft\\.NETFramework");<br />
<br />
<pre><br />
private Boolean GetRegValues(string cregPath)<br />
{<br />
RegistryKey rkeyMachine = Registry.LocalMachine;<br />
RegistryKey rkeySub = rkeyMachine.OpenSubKey(cregPath, RegistryKeyPermissionCheck.ReadSubTree);<br />
if (rkeySub == null)<br />
{<br />
MessageBox.Show("The registry key " + cregPath + " could not be opened.", "Registry Problem");<br />
return false;<br />
}<br />
else<br />
{<br />
string cValue = "";<br />
try<br />
{<br />
string cLeftValue = "sdkInstallRootv";<br />
foreach (string cvalueName in rkeySub.GetValueNames())<br />
{<br />
if (cvalueName.StartsWith(cLeftValue))<br />
{<br />
cValue = rkeySub.GetValue(cvalueName).ToString();<br />
if (cValue != string.Empty)<br />
{<br />
cboSDK.Items.Add(cvalueName.Replace(cLeftValue, "Version ") + " - " + cValue);<br />
}<br />
}<br />
else<br />
{<br />
if (cvalueName == "InstallRoot")<br />
{<br />
cValue = rkeySub.GetValue(cvalueName).ToString();<br />
if (cValue != string.Empty)<br />
{<br />
string[] cDirectories = System.IO.Directory.GetDirectories(cValue);<br />
<br />
foreach (string cDir in cDirectories)<br />
{<br />
if (System.IO.File.Exists(cDir + "\\ilasm.exe"))<br />
cboFramework.Items.Add(cDir);<br />
}<br />
}<br />
<br />
}<br />
}<br />
}<br />
}<br />
catch (Exception ex)<br />
{<br />
MessageBox.Show(ex.ToString(), "Error");<br />
return false;<br />
}<br />
finally<br />
{<br />
if (rkeySub != null)<br />
{ rkeySub.Close(); }<br />
<br />
}<br />
}<br />
return true;<br />
}
----------
There go my people. I must find out where they are going so I can lead them.
- Alexander Ledru-Rollin
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At least I'm pretty sure there isn't a sql problem, the stored procedure works fine in query analyzer, but when I attempt to use it in my program it throws a SqlException:
Line 1: Incorrect syntax near 'NIDB_NIDBArticle_Search'.
Here is the SP:
<br />
CREATE PROCEDURE dbo.NIDB_NIDBArticle_Search<br />
(<br />
@term varchar(100)<br />
)<br />
AS<br />
SELECT<br />
a.article_id AS [ID],<br />
a.main_entry AS MainEntry,<br />
auth.last_name + ', ' + auth.first_name AS Author,<br />
ed.last_name + ', ' + ed.first_name AS Editor,<br />
a.assigned_word_count AS AssignedWordCount,<br />
s.status AS CurrentStatus <br />
FROM<br />
ARTICLE a<br />
JOIN [USER] auth ON a.author_id = auth.user_id<br />
JOIN [USER] ed ON a.editor_id = ed.user_id<br />
JOIN ASSIGNMENT m ON a.article_id = m.article_id<br />
JOIN LK_STATUS s ON m.status_id = s.status_id<br />
WHERE<br />
a.main_entry LIKE '%' + @term + '%'<br />
And here is the method, throws the exception when it attempts to fill the DataTable
<br />
public static DataTable Search(string term)<br />
{<br />
SqlCommand cmd = new SqlCommand("NIDB_NIDBArticle_Search", conn);<br />
SqlParameter parm = new SqlParameter("@parm", SqlDbType.VarChar);<br />
parm.Value = term;<br />
cmd.Parameters.Add(parm);<br />
SqlDataAdapter ad = new SqlDataAdapter();<br />
ad.SelectCommand = cmd;<br />
DataTable dt = new DataTable();<br />
ad.Fill(dt);<br />
conn.Close();<br />
<br />
return dt;<br />
}<br />
Any suggestions? I usually use Enterprise Library but for some reason I kept getting an infinite loop when I try to use it in this Windows form.
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Set the CommandType property of the command to CommandType.StoredProcedure.
---
b { font-weight: normal; }
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Yes that fixed... I feel foolish because I was thinking about that before I was finished then got distracted. When I came back it never poped back in my head.
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i am using WMEncoder 9 sdk to encode a video from a camera, now i want to detect a voice on the screen so that i can know sound is recording or not, GetAudioLevel method is given in sdk but not implemented, is there work around anyone know.
Shajeel
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Hi
Can anyone offer any advice on how to achieve on demand/paged population on tree controls for performance. How is this usually done in .NET?
Thanks in advance...
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You add a "dummy" child node for every node whose real children have yet to be loaded. When a node is expanded you check if it has a dummy node, and if it does, remove the dummy node and add the real child nodes. The dummy node might have Text of "*" or some value which is meaningless in the context of your application.
The "advanced demo" in the sample app for my TreeViewWalker article uses load-on-demand: http://www.codeproject.com/cs/miscctrl/TreeViewWalker.asp[^]
Josh
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private void DeactivateControls(ControlCollection ctl)<br />
{<br />
<br />
foreach (Control ctrl in ctl)<br />
{<br />
if (ctrl is MyTextBox)<br />
((MyTextBox)(ctrl)).EnabledSpecial = false;<br />
<br />
else<br />
(ctrl).Enabled = false;<br />
<br />
if (ctrl.HasChildren)<br />
DeactivateControls(ctrl.Controls);<br />
}<br />
}
MyTextBox.EnabledSpecial is still true after I try to set it to false in this method. What do I do wrong?
-- modified at 8:20 Friday 7th April, 2006
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That depends on what the property EnableSpecial does. Without seeing that code, who knows what is going on?
"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question."
--Charles Babbage (1791-1871)
My: Website | Blog
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I didnt show the enabledSpecial since I know that's not where the problem lies, it works in many other places.
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If you know that that's not where the problem lies, and there's nothing wrong with the code you posted (except overuse of brackets), and you're sure there's a MyTextBox in the control tree, and you're sure you're calling the method, then obviously your code must work. So there's no problem.
using System.Beer;
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well, all that is right except the no problem part =)
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Do you call the method? How? Does the control that you want to change exist under the control collection you send to the method?
---
b { font-weight: normal; }
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this is how I call;
protected override void OnEnabledChanged(System.EventArgs e)<br />
{<br />
if(this.Enabled)<br />
{<br />
this.Enabled = true;<br />
ActivateControls(this.Controls);<br />
}<br />
else<br />
{<br />
this.Enabled = true;<br />
DeactivateControls(this.Controls); <br />
}
and yes, it exists. Ive debugged my way in there, and everything looks right except enabledspecial is still true after the setting to false.
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Here's your problem. If you'd have debugged, you'd have spotted your OnEnabledChanged event getting fired twice when you disable the control.
picture when that event is called, and the control just got disable. therefore this.Enabled == false
Your else clause fires. So you reenable the control. This will cause your event to fire again, but this time you'll be activating the controls.
using System.Beer;
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thanks for your response, you seem to be on to something.
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In addition to what the other posters said, you are casting your object 2x, first by checking the type using the 'is' keyword, then casting it to that type. A better, more efficient way is to use the 'as' operator:
MyTextBox controlAsTextBox = ctrl as MyTextBox;
if(controlAsTextBox != null)
{
....
}
Tech, life, family, faith: Give me a visit.
I'm currently blogging about: How 'bout a little guitar now?
The apostle Paul, modernly speaking: Epistles of Paul
Judah Himango
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The user has many reports done in MS Word. The secretaries type the reports and then the managers have to read the reports and either approve them or refer them back for correction. After approval they need to be printed.
My initial idea is to do a windows application using C# and SQL Server. In the database I store the path to the report documents and this also allows me to add a column to this database table holding a flag, which will indicate whether the document needs to be corrected, has been approved, or can be printed. In that way when the application is started and the list of documents are displayed in ListView (for example) the user can see at first glance which documents are ready for printing, etc. The user can then also select which documents to list (i.e. the approved ones, the ones for printing, or the ones in the archive).
I have managed to write code that will open a document by opening MS Word from within the C# application. However that opens the document external to the C# application and this does not allow me to be able to set a flag once I have read/edited the document and closed MS Word. What I would like to do is open the word document onto my windows form (without losing the formatting) in some way and be able to edit it or even create a new one and still save it as a .doc document. Then once it was saved for example an option pops up whereby the document can be flagged as “Approved”, etc.
Is it possible doing it the way I have thought? Can you direct me to examples of how to get the document opened within the C# form? Any better ideas or suggestions will also be greatly appreciated.
Thanks.
Kobus
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i didn't read what this control can do but perhaps it helps...
http://www.codeproject.com/cs/miscctrl/winwordcontrol.asp
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