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Luc Pattyn wrote: Would you consider writing an article? Seems you could tilt the balance a bit on WPF...
I'm not sure. An article on what? I know, something on WPF, but in spite of what I've done the last 4 months, I'm far from a WPF expert. Just a coding (and, admittedly, a documentation) maniac. I constantly live out of books, MSDN, and Google searches, and am hardly authoritative.
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IMHO an article that explains a real-life WPF application would be worthwhile; it doesn't have to be very technical, however telling about the components used, shedding some light on how they were used, what some of the problems and solutions were, etc. would encourage people to try and use WPF themselves. Of course there are some articles already, but yours seems a bigger, more realistic application, and it not being very high-tech may be a plus.
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Maybe something when I'm out from under this current project. There are some interesting solutions I have in this application, like the way I save hundreds of configuration parameters in an XML file in the Users folder and totally avoid touching the Registry.
This application is based on an MFC CPropertySheet/CPropertyPage application that had about 10 tabs on it. I gave it away free to advanced and professional photographers all over the world. My current beta testers are largely taken from the owners of the original. Its reincarnation has much more professional polish and has about 70 different pages, which of course can't be arranged in a tabbed dialog. Instead its "menu" is a hierarchically organized tree control in a panel on the left with the pages displayed in a panel on the right.
modified on Monday, July 20, 2009 8:45 PM
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yep. The Graphics class has a DpiX and DpiY property (I have never seen them different). You can get a Graphics object from a Control, or from an Image or Bitmap (they default to a screen-compatible Graphics). It would become tricky if and when you have several monitors with different properties...
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As I mentioned, I have a WPF application so can't (or don't want to) use the proposed solution with the Graphics class. I want my WPF application to remain "pure", not mixing Forms stuff in it. On the other hand, I already have gobs of Interop stuff in it, so it isn't "pure" anyhow. For example, I use Interop stuff to enumerate all of the attached monitors so I can get their x,y,width,height properties in pixels. That's exactly my problem. I can only use those numbers as Win32 presents to me if the system DPI is set to 96. If set to 120 (for example) I have to scale them with a factor 96/120.
Luc Pattyn wrote: It would become tricky if and when you have several monitors with different properties...
I do have to render photographic bitmaps on different monitors each of which probably do have different resolutions. But I think the DPI Scaling number applies to the operating system as a whole. The Control Panel does not distinguish between monitors. So I don't think anything "tricky" will be involved, and I already support multiple monitor systems with radically different screen resolutions with no problem.
In any case, I think this is a WPF question, not a .NET question in general, so I've posed the question on the WPF forum.
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fjparisIII wrote: But I think the DPI Scaling number applies to the operating system as a whole
AFAIK that is completely wrong. Yes the Vista control panel has separated the DPI stuff from the Display Settings stuff, however I am convinced under the hood the DPI setting is just one of the Display Settings, and exists separately for each display.
fjparisIII wrote: I've posed the question on the WPF forum
I don't read the WPF forum, however I'm interested in this specific item. So I wouldn't mind if you were to signal a solution here as well (if and when you get one that is).
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Luc Pattyn wrote: I am convinced under the hood the DPI setting is just one of the Display Settings, and exists separately for each display.
I would be delighted to see some actual proof of this. All I can tell you is that my application is working perfectly fine with widely varying resolutions from multiple monitors attached to the system.
Luc Pattyn wrote: I wouldn't mind if you were to signal a solution here as well (if and when you get one that is).
If I get a solution, I'll cross-post it here. I wouldn't be surprised if I have to resort to the Registry hack. That would be very easy to implement, however, much easier than hassling with mixing Windows Forms with my WPF app, but of course vulnerable to the exigencies of humans screwing up the Registry.
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fjparisIII wrote: I would be delighted to see some actual proof of this
AFAIK WinXP lets you choose color depth and DPI resolution for each monitor individually (under Display Settings/Settings/Advanced).
I will investigate when I can, unfortunately I don't have a spare monitor available right now. It may take a couple of weeks.
This[^] seems to suggest Vista is a (temporary?) step back in this respect.
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To tell you the truth, I'd be surprised if this gets "fixed" for Windows 7 and am shocked to hear that it was in XP. I think the wave of the future is to have higher density monitors and most "balanced" systems won't mix 96 DPI monitors with 144 DPI monitors. That said, I haven't yet seen stand-alone monitors much above 100 DPI. But I don't see how you can hold the technology back. Who wouldn't like 3840x2400 24" monitors running at 192 DPI? You could stick your nose in images and see further details. Photographers would fall over themselves for such a monitor.
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I own a 17" laptop with 1900*1200 or so pixels, so that is really 144 dpi and I am sure I've set it at that with the Display Settings (I even created a little app to temporarily switch back to a lower resolution in order to have an easier read on some web sites, that was before there was FireFox with its zoom facilities). That laptop always has been running XP.
And I am almost sure I did connect an old external LCD monitor to it, the only one I have is a 16" with 1280*1024 pixels, which would be close to 96 dpi; I can't imagine having compromised anywhere, so that's what makes me say XP can handle the combination. I don't have the monitor around right now, when I have it back, I will try and make sure.
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Hi,
there is a way to get a display's DPI value through WMI, it is the "LogPixel" field you would need from the Win32_DisplayConfiguration class, so it gets stored for each display individually.
BTW: this retrieval is both Forms and WPF agnostic and does not need P/Inwoke or any Win32 API. However there is one drawback: the first WMI query does tend to take up to one second to execute.
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I got the answer from the WPF forum, where I cross-posted. Here is the code, and it is indeed WPF-specific as I knew it would have to be after getting a suggestion from a Windows Forms programmer on this forum. It is actually much more elegant than the Forms suggestion, one more indication of the superiority of WPF over Windows Forms. It is device-specific! So if Microsoft ever does get around to supporting individual DPI Scalings per monitor, this code will work without change.
Consider the following code snippet:
_left = Monitor.Rect.left;
_top = Monitor.Rect.top;
_width = Monitor.Width;
_height = Monitor.Height;
Matrix m = PresentationSource.FromVisual(this).CompositionTarget.TransformToDevice;
double dpiX = m.M11;
double dpiY = m.M22;
_left /= dpiX;
_top /= dpiY;
_width /= dpiX;
_height /= dpiY;
The original values of _left, _top, _width and _height are the direct result of the monitor properties of the monitor the code is going to display images on. dpiX and dpiY are then the DPI scaling factors of the X and Y directions of that monitor. for 96 DPI (the standard) the values are 1.0. For 120 DPI, the values are 1.25. So I just scale the four monitor dimensions and Voila! Absolute perfection for this particular monitor.
End of story.
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At the MSDN forum a MVP posted a sample explaining HandleRef:
MyObject myObject = new MyObject();
IntPtr handle = myObject.GetHandle();
NativeMethods.SomeNativeFunction(handle);
I don't understand how the value of handle can become invalid, handle is of type IntPtr which is a value type living on the stack until the method where handle is defined returns.
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stax76 wrote: handle is of type IntPtr which is a value type living on the stack
It's a pointer, meaning that it "points" to something else (usually a reference type). It could be pointing to a form, and that form may already have been disposed whilst the pointer is still there.
ForumSig
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I think I get it now but still I think for the rare cases where something actually could get GC'ed it's much easier to keep a reference in order to prevent it to be collected by the GC instead of creating all this pointless HandleRef instances that will never be really needed. Some result but shorter code. For a library where it's not clear how the code will be used maybe it's more important.
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There's quite some legacy-code that expects some complex structures as parameters, and you don't want them GC-ed while the method is executing. Those parameters are usually not referenced after the invoke of the unmanaged code and risk being cleaned up
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Thanks for the help, if you or somebody else knows or stumbles upon some real world code sample showing this I would be glad to see it.
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Any SendMessage call can use the HandleRef. That's the one that's used to crash the VB6-IDE.
There are some examples @StackOverflow[^].
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Hi to all,
I am using Exchange server 2003 & Visual studio 2008
My project is read Unmails from mail server through Interop.MSXML2.dll and pass the mail values like (from,to,body,attachments) to my another application.
My mail server is my Organization server.
Now I read my Unread mails from my server.It shows the following Error Message.
"The remote server returned an error: (403) Forbidden."
Another time I re-run the same application it runs successfully.
now i change the mailserver mail id,First time it shows the the above message. & next time its works fine...
my Sample code:::
Sub XMLEMailWrite()
Dim loRequest As System.Net.HttpWebRequest
Dim loResponse As System.Net.HttpWebResponse
Dim loCredentials As System.Net.CredentialCache
Dim strLsrooturi, strLsquery As String
Dim laBytes() As Byte
Dim loRequestStream As System.IO.Stream
Dim loResponseStream As System.IO.Stream
Dim loXmlDoc As System.Xml.XmlDocument
Dim strpath As String = Path.GetFullPath(strXMLpath)
Dim fiPath As FileInfo = New FileInfo(strpath)
Try
If (fiPath.Exists) Then
File.Delete(strpath)
End If
strLsrooturi = strPathmail & strReadfolder
strLsquery = "<?xml version=""1.0""?>" & "<D:searchrequest xmlns = ""DAV:"" xmlns:m=""urn:schemas:httpmail:"">" & "<D:sql>SELECT ""urn:schemas:httpmail:hasattachment"", ""DAV:displayname"", ""urn:schemas:httpmail:from"", ""urn:schemas:httpmail:subject"",""urn:schemas:httpmail:textdescription"",""DAV:id"" FROM """ & strLsrooturi & """" & " WHERE ""urn:schemas:httpmail:read"" = false" & "</D:sql></D:searchrequest>"
loCredentials = New System.Net.CredentialCache
loCredentials.Add(New System.Uri(strLsrooturi), "NTLM", New System.Net.NetworkCredential(strUsername, strPassword, strDomain))
loRequest = CType(System.Net.WebRequest.Create(strLsrooturi), System.Net.HttpWebRequest)
loRequest.Credentials = loCredentials
loRequest.Method = "SEARCH"
laBytes = System.Text.Encoding.UTF8.GetBytes(strLsquery)
loRequest.ContentLength = laBytes.Length
loRequestStream = loRequest.GetRequestStream
loRequestStream.Write(laBytes, 0, laBytes.Length)
loRequestStream.Close()
loRequest.ContentType = "text/xml"
loRequest.Headers.Add("Translate", "F")
loResponse = CType(loRequest.GetResponse, System.Net.HttpWebResponse)
loResponseStream = loResponse.GetResponseStream
loXmlDoc = New System.Xml.XmlDocument
loXmlDoc.Load(loResponseStream)
loXmlDoc.Save(Path.GetFullPath(strXMLpath))
loResponseStream.Close()
Catch ex As Exception
Err.ErrorLog(strErrorfile, "XMLEMailWrite()", ex.Message)
End Try
End Sub
What is that problem & how to rectify that one?????
Pls help me...
thanks,
nkmkrishna
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The remote server returned an error: (403) Forbidden, means just that. Your authentication failed, try using the right username and password.
If at first you don't succeed ... post it on The Code Project and Pray.
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I am trying the same thing in C#. But i am getting the "login timeout error".
please let me know the reason or post ur sample code.
your code doesnt seems to be using Interop.MSXML ? or how to use the same ?
your help would be highly appreciated.
Regards.,
Veerasekar
Code :
~~~~~~~
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.IO;
using System.Xml;
namespace EmailReading
{
public class MailUtil
{
private CredentialCache creds = new CredentialCache();
public MailUtil()
{
}
/// <summary>
/// Gets all unread emails in a user's Inbox
/// </summary>
/// <returns>A list of unread mail messages</returns>
public List<model.Mail> GetUnreadMail()
{
List<model.Mail> unreadMail = new List<model.Mail>();
string reqStr =
@"<?xml version=""1.0""?>
<g:searchrequest xmlns:g=""DAV:"">
<g:sql>
SELECT
""urn:schemas:mailheader:from"", ""urn:schemas:httpmail:textdescription""
FROM
""
WHERE
""urn:schemas:httpmail:read"" = FALSE
AND ""urn:schemas:httpmail:subject"" = 'tbintg'
AND ""DAV:contentclass"" = 'urn:content-classes:message'
</g:sql>
</g:searchrequest>";
byte[] reqBytes = Encoding.UTF8.GetBytes(reqStr);
// set up web request
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create("https://mail.Mycompany.com/Exchange/demo@Mycompany.com/Inbox/");
//request.Credentials = this.creds;
request.Credentials = new NetworkCredential("Demo", "password123","MyDomain");
request.Method = "SEARCH";
request.ContentLength = reqBytes.Length;
request.ContentType = "text/xml";
request.Timeout = 9000000;
using (Stream requestStream = request.GetRequestStream())
{
try
{
requestStream.Write(reqBytes, 0, reqBytes.Length);
}
catch
{
}
finally
{
requestStream.Close();
}
}
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
using (Stream responseStream = response.GetResponseStream())
{
try
{
XmlDocument document = new XmlDocument();
document.Load(responseStream);
// set up namespaces
XmlNamespaceManager nsmgr = new XmlNamespaceManager(document.NameTable);
nsmgr.AddNamespace("a", "DAV:");
nsmgr.AddNamespace("b", "urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/");
nsmgr.AddNamespace("c", "xml:");
nsmgr.AddNamespace("d", "urn:schemas:mailheader:");
nsmgr.AddNamespace("e", "urn:schemas:httpmail:");
// Load each response (each mail item) into an object
XmlNodeList responseNodes = document.GetElementsByTagName("a:response");
foreach (XmlNode responseNode in responseNodes)
{
// get the <propstat> node that contains valid HTTP responses
XmlNode uriNode = responseNode.SelectSingleNode("child::a:href", nsmgr);
XmlNode propstatNode = responseNode.SelectSingleNode("descendant::a:propstat[a:status='HTTP/1.1 200 OK']", nsmgr);
if (propstatNode != null)
{
// read properties of this response, and load into a data object
XmlNode fromNode = propstatNode.SelectSingleNode("descendant: :from", nsmgr);
XmlNode descNode = propstatNode.SelectSingleNode("descendant::e:textdescription", nsmgr);
// make new data object
model.Mail mail = new model.Mail();
if (uriNode != null)
mail.Uri = uriNode.InnerText;
if (fromNode != null)
mail.From = fromNode.InnerText;
if (descNode != null)
mail.Body = descNode.InnerText;
unreadMail.Add(mail);
}
}
}
catch (Exception e)
{
string msg = e.Message;
}
finally
{
responseStream.Close();
}
}
return unreadMail;
}
}
}
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Hi all,
In the project am doing in vb.net, i have five forms. A link from one form e.g form A to B ensures that form A is closed or hide and B is shown. And am using the form control values e.g textboxPatID, which is used for patient's ID, of form A in form B and other forms to access databse on other details about the patient like Lab,medical report etc.
Now my problem is; because form A is closed before form B opens, if I use the same value of patient ID repeatedly, an exception throws, indicating that "........make sure u've not released resources before trying to use it".
I used "public shared .." and "Private property" , to access the form value in form A from form B.
My question is this: How do I keep using this textbox value repeatedly while at the same time form A is closed?Any suggestion will be appreciated.
Thanks!
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This is one of the reasons why having one form access controls on another form is generally discouraged. You should define a property on form B and set in in the code that moves from A to B. If that is not possible, you should be able to use an application level object outside of both forms that has a "CurrentPatientID" property or something similar.
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I tried to use this property code in form B:
Public Property PassdText() As String<br />
Get 'stores the extracted value<br />
Return _pasdText<br />
End Get<br />
Set(ByVal value As String) 'assigns the extracted value to "_pasdText" variable<br />
_pasdText = value<br />
End Set<br />
End Property
And then used the following code in the button_click to access it in form A :
Dim vw As New vwPatient
vw.PassdText = sachTextBox.Text
but when it gets to form A, a null exception is raised for the first selected index. So what do i do?
(by the way am using tabcontrol in form B,so each time a tab page is selected, a query runs using the patientID)
The other suggestion about "application level object", I dont have a clue on how to do that.
Am not experienced in vb.net.
Thanks!
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Where is the null reference exception happening? Is sachTextBox null? If so, the routine you are in may be being run before the form is completely loaded and you will need to check that the form is loaded (or that sachTextBox is not null) before this code runs. If not, you will need to find out what is null and figure out a way to get it initialized before trying to use it.
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