The following code loads a large 1 bit depth bitmap (10800x7226) on a PictureBox docked and with auto scroll bars.
After loading the bitmap I can drag the scrollbars, and it's very responsive.
After clicking the PictureBox and executing the Bitmap.Clone, dragging the scrollbars becomes very sluggish.[code]...
Dim img As D.Image = CType(Resources.EtcImage("Title"), Bitmap).Clone(D.Imaging.PixelFormat.Format24bppRgb)
MsgBox(img.PixelFormat.ToString)
[code].....
Are there other conditions that can cause this exception to be raised? I am attempting to use the method to take a section of the source bitmap in question (possibly equal to the entire source bitmap). I have checked my code extensively, including verifying the parameters of the Rectangle at runtime, and even tried hard-coding a Rectangle with parameters that I knew were within the bounds of the source bitmap, but have still received the error. I tried several choices for the PixelFormat as well.
View 6 RepliesI have designed an application just like it is an Excel table. By changing each textbox the application runs a huge amount of vb code and it takes time.
E.g. you want to enter a three digits number it takes from two to four and sometimes more seconds for ech digit to enter. That`s really embarrassing.
I have a problem with a application, when i start the program the speed is ok.after 1 hour of use the prohram go very slow.
View 7 RepliesI have been developing an application using Visual Studio/VB and access 07 for my db. On the system I am developing my app. the db is local and the speed of the application is very good when I debug it. As I publish my application the db goes on a network server and the application is installed/used by 5-6 pc. The speed of the program drops alot as time passes and as is used, speed goes even more down. My problem is that I do not know what is making this change. Is it the server fault, the other pc, the many users, the lack of garbage collector ( other than the one vb does alone ), the existense of the db on the server? Based on the information I give does anyone has a tip on how to increase speed. I dont know how to begun to start fixing it as I do not know where the problem resides. One example of poor performance is the search I do on the program. For the first search I do they are ok then the more I make the slower they get.
View 16 RepliesI have a Vb.Net 2010 solution with two projects and a total of around 500 forms. Until last week compilation of these projects occured in about 30 seconds. Starting a few days ago (without any noticiable change) compilation now takes around 15 minutes! The «culprit» seems to be ResGen.exe: looking at Task Manager this program is using 25% of CPU time while devenv.exe stays idle - no other programs are active. Target CPU is x86 and target Framework is 3.5. The development machine runs Windows 7 Professional and is updated with all regular updates and SPs.
View 2 RepliesI've read around that playing WAV files from resources using My.Computer.Audio.Play causes horrid distortion when playing the sound, and I've experienced this myself. I cannot,however, use WaitToComplete, because the sounds are associated with a timer that cannot stop for anything, as it is an official competition timer.Also, I'm having an issue with the application being extremely slow when loading data from an Excel file. Essentially, the program has a grid of labels with transparent backgrounds (which seems to make the speed issue worse). The program uses the MS Office library to pull data from a spreadsheet, then output cells to one label at a time. This unfortunately, causes the application to nearly freeze, which also stops the timer, which as I said above, cannot happen
View 8 RepliesI am moving a lot of data to MS Excel from my application. I use a conditional statement to choose which Excel page the data is transferred into. Then a For Next statement to divide the data into various areas on the Excel sheet.The first sheet will always work correctly, but on the next conditional statement to chose the next Excel sheet no data transfers when running the program. If I step the program by hand all data all code works fine. I believe I need to pause between the conditional statements but I have been unable to get one to work.In the following code I have been trying to get a pause between to conditional statement to no avail.
[Code]...
I'm asking this question here, in this forum, as I couldn't find MSDN Managed forum for Crystal Reports. And the previously asked questions are unanswered. I've developed an application using VB.NET and Crystal Reports in VS2008. The report generated gets printed correctly on modern laser or inkjet printers. However, the entire formatting gets affected when I print these reports on dot matrix printer. Apart from that. the print speed is very slow. I tried exporting the report to PDF, XLS, DOC and other formats - but no solution. There was Export to Text function, which is not working in Crystal Reports now.
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I found some code online for a vb paint application and I modified it for my use, which is a signature application. It uses a tablet connected to the pc to write the signature on the screen and then save it as a bitmap for later retrieval.The only issue i am having right now is that if you write on the tablet too fast, the signature gets broken up alot, any way to quicken the paint process in the code so that I can get a smoother signature?
Here is my code:
Imports System
Imports System.Collections
Imports System.Data
Imports System.IO
Imports System.Xml.Serialization
[Code] .....
I noticed that my application is running a bit slow. This is a Windows Service built using VB2010 with SQL Server as a back end. Its main function is to poll a folder looking for a text file. If found it reads the text file and imports the data into SQL Server.
While the slowness could be caused by a number of reasons, I am looking at my code to determine if it could be more efficient. Below I've pasted snippets of code where I initialize the DB connection and execute SQL statements. I've also included a snippet that illustrates how I am processing the text file.
I'd appreciate if the group could have a look at these and let me know if the method that I am using is the most efficient possible. At this time I am also focusing on other probable issues, but I can't rule out the possibility that the code that is in place might be a contributing factor.
[Code]...
I have an application that consists of about 4 screens. Screens can be changed by clicking on buttons or via menu item. I use about 16 to 17 tables in all for all 4 screens. I've publised the application and it works fine except that it takes about 1 1/2 to 2 minutes to launch the application using the setup file that I save onto my PC. If I get lucky, a little over a minute is already fast for me. What can I do to help speed up the launch time?
View 12 RepliesI'm using Bitmap to show picture box like slideshow using Timer. For each timer interval, I've to go for new instance of Bitmap, there System memory increases to 1MB, How to resolve this, 'BG is picture box
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tic Dim img As Bitmap
img = New Bitmap(System.Drawing.Bitmap.FromFile(FileIO.FileSystem.GetFiles
[CODE]...
I'm trying to use a ToolTip directly to a Bitmap Object (System.Drawing.Bitmap), aparently I can't do this because Bitmap isnt a Windows Control.
View 1 Replieshow can i create a monochrome bitmap from a semi transparent bitmap in vb.net? the bmp is for a transparency mask image for an icon i'm trying to create with the CreateIconIndirect API function.
i'm using vb2008 .Net3.5, but i would prefer an answer that would also work in vb2005
I'm using a background worker to in an Excel VSTO application to throw up a progress dialog box with a status bar and a cancel button to escape from long running calculations. It's working really well, except for one issue. I'd like to use a Modal Dialog, so that the UI behind the dialog gets locked up, instead of a Modeless Dialog. If I use .ShowDialog() instead of .Show(), everything is great until you hit the Cancel button on the form. Following things in the debugger, the cancellation happens, it just takes somewhere in range of 30 seconds. If I use .Show() on my form, then the cancellation occurs immediately as it should.
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Here is a short program to demonstrate my question. I just want to extraxct a rectangle bitmap from a big bitmap.Code as follows:
Private
Sub Button3_Click(ByVal sender
As System.Object,[code]....
Execution stops when hitting the Dim cloneBitmap statement, which should have created a bitmap out of the rectangle cut out.The message is:
"MissingMemeberException was unhandled.
No default member was found for type 'bitmap"
I just don't get it. Seems that the method Clone(Rectangle, PixelFormat was not found.
I have a grass image located here in my directory. I want to just create a Bitmap, but I am getting an error. (Parameter is not valid.) Immediate Window: A first chance exception of type 'System.ArgumentException' occurred in System.Drawing.dll
[URL]
private void Form1_Load(object sender, EventArgs e)
{
Bitmap bmp = new Bitmap("grass.jpg");
}
bertino
In my vb.net applications, I do a lot of reading/writing to excel files.This is one of the simpler bits of code I use:
Dim objApp As Object, objBook As Object, objSheet As Object
objApp = CreateObject("Excel.Application")
objBook = objApp.Workbooks.Open("C:maid2cleanM2CPrinters.xls")
objSheet = objBook.Worksheets.Item(1)
[code]....
It's never been fast but in the last few weeks it seems to take forever.The "createobject" line is taking 4 seconds to run. is there any way I can find out why it's slowed down?
There is something that I do not understand the point of, and it has to do with ICloneable.
Take the simple example below:
Public Class MyClass2
Implements ICloneable
Private p_List As New List(Of String)
Private p_Number As Double
[CODE]...
No... For the life of me I cannot understand why anyone would want a Shallow copy of anything.... And... I do not understand why the Me.MemberwiseClone would not work with list and arrays....
on cloning a selected listviewitem from listview1 when a button is clicked to listview2. How do I achieve this? Here is the code I have but does not work exactly how I want it, it just makes a clone of all the listviewitems in listview1.
foreach (ListViewItem item in this.listView1.Items)
this.listView2.Items.Add((ListViewItem)item.Clone());
I would like to know how i can clone an image of a picturebox.I have the picturebox not visible on my screen and want to recreate the image on a certain location.what is the easiest way to do this?
View 2 RepliesI have a panel that is "drawn" on by passing: panel.CreateGraphics.GetHdc() into an api call
I was wondering how i can then clone what is now on that panel to another - i have tried: panel.DrawToBitmap and then painting the resulting image on the other panel - but this doesn't work
oh and also the panels may not be the same size ... so in this case the result would need to be "stretched" or "shrunk"
I ve google addrange method and came to msdn but there they showed this:
Private
Sub
CreateMyListView()
[code]....
I have a object collection type of BindingList(of T), i want to take same copy of the object. but the problem is when ever i made the changes in the copy then the original object also reflect that change, how can i avoid it .
View 1 RepliesI am trying to clone some of my Controls, with their EventHandlers. I have a function to retrieve the Delegate of a specific EventHandler.The hard part is to find the correct naming to use.
This is the function I'm using
Private Function GetEventDelegate(ByVal ctrl As Control, ByVal eventname As String) As [Delegate]
[Code]......
I am trying to clone some of my Controls, with their EventHandlers. I have a function to retrieve the Delegate of a specific EventHandler.The hard part is to find the correct naming to use.
This is the function I'm using
Private Function GetEventDelegate(ByVal ctrl As Control, ByVal eventname As String) As [Delegate]
[code]......
I want to make a clone of a selected row in a DataGridView, while searching I saw that a 'Clone' method exists but I can't use it too well I don't know if it is due to have a Binding Source to it. Are someone familiarized with this method ?
View 2 RepliesIs there a simple way to differentiate single display vs. dual display clone? I am asking about dual clone, not extended desktop. .Net Screen class treats dual clone as single display. I could not find useful WMI method also.
View 6 Replies