I'm trying to convert a batch of .pngs to .jpgs, as in this question:
[Code]....
The call to jpg.Save, however, with a "generic error" in GDI+. Originally outside of the innermost Using statement, I moved the call inwards as per this answer, but it didn't change anything. I have verified that newfile contains a valid path, and that the program has write access to the directory. What am I missing?
what is wrong with my code and I get no feedback from my button click event, i have imported. ( code Below) and i have tied differrent combinations of the code without sucess.maybe add extra to my code for the list to show open Port or closed ports.
Imports System.Management
Imports System.Management.ManagementObjectSearcher
Imports System.Management.ManagementNamedValueCollection[code].....
This code:
vb Dim s As String = strContents '<a global variable) Dim currentPos As Int64 = 0 Dim endPos As Int64 = strContents.Length - 1 '// A dictionary, used to count the frequencies Dim characterCounter As New Dictionary(Of [String], Int64)() While currentPos <> endPos '//
[CODE]...
Gives this error: Value of type 'System.Collections.Generic.KeyValuePair(Of String, Long)' cannot be converted to 'System.Collections.DictionaryEntry'.
I wanted a Message Box to appear when a file can't be found, for example. I made a Combo Box (ComboBox1) and a button, this is what the code was:[code]If a file can't be found, I want a message box to appear, not an Error Provider, I tried this code, but it did not work:[code]
View 2 RepliesI Have just been watching a video on throwing Exceptions. Are you supposed to throw System.Exceptions from within your custom classes. to the calling code, Which other way can they communicate. I have read in several places it is bad practice to throw SystemExeptions.
View 3 RepliesI am updating a legacy application, and it was reading a dll from another project for a Dictionary(of Guid, String) of items and using them.
The requirements have changed, and the method that was returning the Dictionary is now returning an IList.
This is the odd behavior of this; the intellisense is not throwing a cast error, nor is the compiler. It does not throw an error until runtime when it tries to set the Dictionary to the IList.
Example:
Dim someDictionary As Dictionary(Of Integer, String) = New Dictionary(Of Integer, String)
Dim someList As IList(Of Integer)
someDictionary = someList
why the compiler is not catching this?
Below, why doesn't Throw maintain my originating line number? If I run the DerivedPage, my log file lists the error as line 7. Shouldn't it say line 4? It would make sense if I had Throw ex, but I don't. Isn't Throw by itself just supposed to rethrow and bubble up the error? If I remove the Try...Catch block entirely in DerivedPage, then my log file correctly lists 3 as the error line, but I am not able to log any info in case of an error. What can I do to maintain my DerivedPage, and still have my log keep the correct line number?
Public Class DerivedPage Inherits BasePage
Page_Load(o,e)
Try
[CODE]...
Base page:
Public Class BasePage
Protected Overrides Sub OnError(e)
MyBase.OnError(e)
[CODE]...
Log.Error does output the InnerException if it exists. It does in this case. However, the stack trace for the InnerException doesn't contain a line number, just the Exception details.
I want to check if an IP address can be resolved to a hostname.I figured I would use System.Net.Dns.GetHostEntry as System.Net.Dns. GetHostByAddress is shown as obsolete in VS2008.
However,if I specify an invalid IP address to System.Net.Dns.GetHostEntry the HostName property equals the IP address I gave. If I use System.Net.Dns.GetHostByAddress it, rightly, gives a resolution error.I don't mind continuing to use System.Net.Dns. GetHostByAddress but is there any way to have System.Net.Dns.GetHostEntry throw an error if the IP address cannot be resolved to a hostname (other than by checking if the IP address given equals the hostname returned, I mean)
So i've been working on a page for a project where the person logs into a login page and then can see a list from the database of employees. everything is working except for one problem. If someone puts in a username and password, username= a and password=b, for example it still allows that individual to view the next page and doesn't throw the error that i have enbedded on the login page to say sorry you have the incorrect password/username. The working code that i have so far is below:
[Code]...
We have migrated our Vb6 application to VB.NET using a third party tool. Now we are in a process of Refactoring and introducing object oriented concepts in the application.
In VB6, we were using structures in many places. As a part of introducing object oriented programming,
1. is it a good idea of changing all Structures to Classes? or Is there a concept of "Generic Structure" similar to Generic collections, Generic classes?
2. Can some one guide me any source containing guide lines or best practices for applications that are migrated to VB.NET from VB6 and implementing object oriented programmaing.
You can do this
Code:
Dim Test() As String = {"Stuff", "Stuff", "Additional Stuff"}
Is there a way to do that with a generic dictionary? Also, is there a name for that?
I must be doing something wrong here (because really, what are the chances of me tripping over another bug in the Vb.net compiler?)I have a static generic function in .net 2.0 Vb code, I thought it was time to "upgrade" it to be an extension method, but the compiler complains with Extension method 'AddIfUnqiue' has type constraints that can never be satisfied.
Here's a trivial example that displays the same problem. The old static version (which works fine) followed by the extension method
Public Class MyStaticClass
Public Shared Sub AddIfUnqiue(Of T, L As {List(Of T)})(ByVal this As L, ByVal item As T)
If this.IndexOf(item) < 0 Then
[code].....
I got that line of code and it's getting duplicated a lot
myString = If(myObj1.myProp Is Nothing, "", If(want = "abr", myObj1.myProp.abr, myObj1.myProp.desc))
VS 2008 Remember Textbox Text when Form reopens
I read an image from the database and displayed it in a picture box...works fine...here is the code for that...[code].....
It throws an error on line 2 saying "A Generic Error occured in GDI+."
I have 10 year old animated GIF that works fine in an internet browser, but when I set it as an image in a picture box I get the following error: "A generic error occurred in GDI+." I attached the file. Does anyone know how I can get this image to place in my vb form? If the image needs to be modified?
View 4 RepliesI have some code that takes a screen capture of my monitor. This code seems to work perfectly OK and can take multiple screen captures, apart from when I do a Print Screen using the keyboard or open SnagIT 8, when I then try to run my code again I get an error "A generic error occured in GDI+" I am at a bit of a loss, I have had a look on the internet, but everything I seem to find appears to be related to web apps. and access permissions. This is a window based application and therefore can not seem to find an answer.[code]
View 1 RepliesI've got the coding below to make a screenshot and store it in a jpg file`.. this works fine on my computer with vb.net installed. However when I tried running it on an other computer it gave me this exception:
'a generic error occured in gdi'
'the coding
PHP
Dim screenImage As New Bitmap(My.Computer.Screen.Bounds.Width, My.Computer.Screen.Bounds.Height)
Dim g As System.Drawing.Graphics = System.Drawing.Graphics.FromImage(screenImage)
[Code]....
I've read on internet that this is a write permission issue or it has something to do with the stream. Anyway I dunno how to alter the coding so that every user can make a screenshot.
I am writing a VB.NET application which captures an image from a webcam and saves it as a jpeg. I have a button which captures the image and successfully saves the image. However when I click the button again to save the image as the same file I get the following GDI error[code]....
View 4 Repliesi save the PictureBox Image to the Sql using the following code
Private Function convertPicBoxImageToByte(ByVal pbImage As Image) As Byte()
Dim ms As New System.IO.MemoryStream()
pbImage.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg)
[code]....
How do I fix this error with the code below in visual basic.net using visual basic express?[code]...
View 1 Repliesi try to save image to a folder on a server. i load the image from a fileupload control, resize it and save to the folder. this works fine when i run from Visual studio. But when i deployed to the server, i get the error: "Generic Error Occured in gdi+". In trying to solve this, i give network service and asp.net accounts permissions to the folder.
Public Function SaveEntityImage() As Boolean
If fuEntity.PostedFile IsNot Nothing AndAlso fuEntity.PostedFile.FileName <> "" Then
[code]....
I need to save an image after opening it in from an OFD.
[code]...
I have a problem with this code. If i start the program and click on save.The program saves the picture. If i reload the picturebox and save it again i get the error :A generic error occurred in GDI+.I think the problem is that the File is being used by another process.So i think i can't rewrite the bmp file. Is it possible to release it from the process so i can write it again? [code]
View 11 RepliesMy app has an image in it in a picture box. I need the end user to be able to change it. So the code I added below should do that. However, I get the "A generic error occurred in GDI+. while saving".I understand it as this- possibly an error saving it to C:?? Because when I save it to a folder such as MyPictures or Pictures it saves A-ok. [code]
View 4 RepliesWe are developing an application for our shop floor. This program will be tracking material through the shop and we need to capture any errors the program generates, but we don't need to stop the program for all errors. I have some code to do a screen capture and put it in a database with exception.tostring data for debugging.
What we would like to do, is create an exception from the base class, but provide additional properties to allow us to set a severity and a user friendly error message. I would like to encapsulate this in a class that we would call in the catch of a try/catch, set the properties on the class, have the class record the data to the database, then raise the exception to the main program to display only the user friendly message and severity. The main program would then determine the severity and based on the severity stop the program or just display a discreet msg and continue to process.
Does anyone have an example of a custom exception class derived from exception that does something similar, or if I heading in the wrong direction, does anyone have a better solution?
I have a vb.net form with ToolStrip menu [code]My development environment is .net 4.0, VS2010, windows 7 x64; but occasionally I am getting next erro.[code]
View 1 RepliesI did post this in my thread about webcam but its nothing to do with webcam issues, the code for the webcam is working perfectly now I am instead now having an issue saving an image file from a picture box.
I don't mind how its done or whether its bmp/jpg (jpg would be better for te compression) but This orginally did work now I keep getting this error that I have never come across before and can't find much information on the error.Error Message:A generic error occurred in GDI+.
[Code]...
i just encounterd an error gdi+ when saving same image back to database.im using this code to get image from db
'Stream object containing the binary data
Dim ms As MemoryStream
ms = New MemoryStream(CType(Me.DataGridSearchView.SelectedCells(10).Value, Byte()))
frm.Picture1 = Image.FromStream(ms)
ms.Close()
frm.Picture1 is a property of image type from another class.and this my code to update image back to db
If Not Me.PictureBox1.Image Is Nothing Then
Dim custPic as Byte() = Nothing
Dim ms As MemoryStream = New MemoryStream
[code]....
there is no problem if i changed the image before saving it back to db,it gives error if you will not change the image before saving it back to database..
I'm writing an application which as part of it draws an image on a Logitech G15v2 keyboard's LCD. For the most part the function works fine, but after a while of running, one of the lines throws a "Generic Error in GDI+" The problem, according to a stack trace, is in Bitmap.GetHbitmap():
at System.Drawing.Bitmap.GetHbitmap(Color background)
at System.Drawing.Bitmap.GetHbitmap()
at CSCI171_TermProject.G15.Tick(Single Interval) in C:UsersSukasaCSCI171Term ProjectCSCI171-TermProjectG15.vb:line 45"
I've read a few threads mentioning this error, but that was in the context of saving a file, not getting its associated HBitmap. Would anyone with more experience with GDI+?For better reference, here's the full code module:
Public Module G15
Private G15 As New G15Lib.G15Interface
Private G15BaseImage As New Bitmap("GFXG15-BGImg.png")
Private G15Minimap As New Bitmap(43, 43, Imaging.PixelFormat.Format32bppArgb)
[code]....
I have a problem with the VB.NET compiler failing to compile a class (in a separate C# assembly) which contains two overloads of a method with generic arguments. The equivalent code in C# compiles against the same assembly with no errors. Here are the two method signatures:
protected void SetValue<T>(T newValue, ref T oldValue)
protected void SetValue<T>(T? newValue, ref T? oldValue) where T : struct
Here is the code to three assemblies that demonstrate the problem. The first is the C# assembly with a Base class that implements the generic methods. The second is a C# class derived from Base and calls both overloads of SetValue correctly. The third is a VB class also derived from Base, but fails to compile with the following error message:
[Code]...
Am I doing something wrong in the VB code, or are C# & VB different when it comes to generic overload resolution? If I make the method arguments in Base non-generic then everything compiles correctly, but then I have to implement SetValue for every type that I wish to support.