Is there any easy way to check if a selection made by a user from the browser is an image type and not any other file type. I could check for extension types i.e. bmp, jpg etc but what I would like to know is whether there is a generic term.
View 4 RepliesI an working on image converting program. I need to convert a file that the user selects in an openfiledialog to the following file types in a folder that the user selects:
.ICO
.PNG
.JPEG
.BMP
.GIF
The user will select which type they want to convert the image to.
I have a picturebox with an image in it. I want to 'select' a section of this image (like standard selection tools in other image editors) and place it in another picturebox... The piece I want to select is a square and I have the coordinates.
View 1 RepliesWanted users to choose two options 1.(tick) 2 blank text so they can write things.
Was thinkin how this can be achieved using a comboBox. ?
I have a number of controls (Device1, Device2, etc.) that all inherit from BaseDeviceControl. In the DragEnter event handler I am trying to test for the correct type by using the BaseDevvceControl like this....
[Code]....
I'm trying to enable toggle type selection on rows of a datagridview, i'm developing my project in Visual Basic .NET.
Public Class Form1
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
With DataGridView1
.Columns.Add("Column1", "Column1")
.Rows.Add(4)
[Code] .....
"Does the selection type of variables speed up the code execution in VB.NET?"For example, I have two same exactly same projects where the first project is running with all Single variables and the other project which running with all Double variables.Is there any difference in term of the speed of code execution?This is because I'm working on a project which is very critical in term of the speed of execution. However, I'm using Double variables for most part of the code.
View 4 RepliesI have a bundle of tiny pictureboxes on a form. The number is specified by the user, but it could be up to 100, or so. The user can select any set of these pictureboxes by a variety of means. I want to change the image to show the selection state of the pictureboxes, and I'm looking for the best way to do that. The pictureboxes each shows a bitmap. The brute force method would be to have a selected image and an unselected image and just swap them, but it seems like there ought to be a way to do something significant and reversible to the image, such as inverting the colors, that might be smaller that having a second copy of each image.
View 5 RepliesI've got an app where the user uploads an image and the app resizes the image three different ways based on different variables. They all use the same image. I can't check to see if it's done using the image so I wondered if there was a way to check to see if the file is writable. A small loop that exits once it becomes writable (or "deleteable"). Working out of VB.NET.
View 1 RepliesI want to do the following
1) Copy a picture in paint (done Manually)
2) Select and copy a portion of it (Done manually)
3) Paste the selection to my image control via clipboard
in other words if in paint I copy a selected portion of an image how Can I get the selection in my vb application via the clipboard?
I have been googled for couple of hours but couldn't find a solution
I m doing a touch screen interface, to browser a page I used a webbrowser control, and in order to get ride of the ugly scrollbar, i m trying to use mousedown and mousemove event on the webbrowser to move the page around, it worked but when i m doing it, it select and highlight the content on the web too, how can i stop that?
do I need to create a extended webbrowser control by Inherits the orginal one?
I want to be able to change an image depending on what is selected in the drop down box. I have this JS code to change the image. Simplified of course.
<script type="text/javascript">
function changeImage() {
var oDDL = document.all("ddlNAME");
var NAME= oDDL.options[oDDL.selectedIndex].text;
switch(NAME) {
[Code] .....
When I call this function I do it in my DDL implementation.
<asp:DropDownList ID="ddlNAME" runat="server" OnTextChanged="changeImage()" >
But for some reason the changeImage() is not firing. It is giving me an error saying
'changeImage' is not a member of 'ASP.default_aspx'
whats the quickest and least application hogging way to retrieve image from web and show in picturebox on listview selection event?
Heres the code i have already which produces app lag for abut 3-5 seconds per image loaded, i think as it stretches the image to fit into picturebox (which is needed)
vb Private Sub bwGetScreen_RunWorkerCompleted(ByVal sender As System.Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) Handles bwGetScreen.RunWorkerCompleted
For l As Integer = 0 To ListView2.Items.Count - 1 'start download selected If ListView2.Items(l).Selected = True Then Dim fileid As String = ListView2.Items(l).SubItems(5).Text.ToLower Dim recordid As String = ListView2.Items(l).SubItems(6).Text.ToLower + 1 urlpic = "http://se-board.com/index.php?app=downloads&module=display§ion=screenshot&full=1&id=" & fileid.ToString() & "&record=" & recordid.ToString()
[Code]...
If i wanted to crop an image in VB.net, how would I go about doing it? I am trying to let the user drag out the box they want (system.drawing.rectangle), and it will automatically remove the edges surrounding the box.
My first problem is primarily the fact that I cannot make the system.drawing.rectangle visible. It is not displaying at all, I am setting its location and height programmatically, but nothing is showing up. I know there is probably something fairly obvious I am missing...but I cannot seem to find it.
My larger issue, however, lies with the cropping itself. I cannot find any crop methods, at all. Is there a hidden one I am missing? Or must I code it myself? How would I go about doing this? It ought to be able to output to a bitmap image object.
Dim Button As ToolStripButton = New ToolStripButton
Button.image = Icon.ExtractAssociatedIcon(exefile)
I try that code, and it just throws me the error that type Icon cannot be converted to Image. So how do i get around this? And does "ExtractAssociatedIcon(exefile)" work on exe files? Admittedly i don't really know what im doing
Dim Button As ToolStripButton = New ToolStripButtonButton.image = Icon.ExtractAssociatedIcon(exefile)I try that code, and it just throws me the error that type Icon cannot be converted to Image.So how do i get around this? And does "ExtractAssociatedIcon(exefile)" work on exe files?
View 3 RepliesI Tried To Check If Part Of Image Existing In Another Image
Explanation:
full image:
[Code]...
I have the following code that gets a jpg image from sql which works fine.What i would now like to do is save this image as a file on my pc in a temp folder that i can use in a report. i would like to change the name of this image to the sheltercode.below is the code that i use to get the image from the sql table and populate into a picture box on my form. conn.Open() [code]
View 2 RepliesI am using VB2008 in VS Prof and try to convert at Byte arry stored as a Image format in Sql2000 database.
Code:
Using acnLoc As New SqlConnection(CSLoc)
acnLoc.Open()
Dim G As SqlCommand = New SqlCommand("SELECT [SignatureData] FROM [MyTable] where [OID]=@OID", acnLoc)
G.Parameters.Add("@OID", SqlDbType.Int).Value =Cint(bxShipmentno.Text.Trim())
dim P= G.ExecuteScalar() 'returns a system arry
[Code]...
I've wondered if i can make it so when i click on a checkbox you may not beable to check another. And i do not want to use radio buttons
View 9 RepliesWhen I close my form without saving I want to check if the data on my form has changed since the last time I saved the data.This peace of code, which I included at the bottom always worked fine.Except when I compade a DateTimePicker with a null value in the db.Than I get the error "Conversion from type 'DBNull' to type 'Date' is not valid."Probably on this peace of
Me.dtpVrijeDatum01.Value.Date <> CDate(reader("VrijDatumVeld01")).Date Or
Me.dtpVrijeDatum02.Value.Date <> CDate(reader("VrijDatumVeld02")).Date Or
Me.dtpVrijeDatum03.Value.Date <> CDate(reader("VrijDatumVeld03")).Date Or
Me.dtpVrijeDatum04.Value.Date <> CDate(reader("VrijDatumVeld04")).Date Or
Me.dtpVrijeDatum05.Value.Date <> CDate(reader("VrijDatumVeld05")).Date Or
The total code to check the changes is:
Private Sub CheckForChanges()
LeesCheckboxWaarde(Me.chkFacAdrIsBezAdr, intCheckFacAdresIsBez)
LeesCheckboxWaarde(Me.chkPosAdrIsBezAdr, intCheckPosAdresIsBez)
[code]....
I get the error: Conversion from type 'FileInfo' to type 'String' is not valid. This happens in between try and end try
Private Sub CopyNotes()
Dim NotesBase As String
Dim NotesTgt As String
[Code].....
I'm storing dates intoa table like:vb.net "INSERT INTO myTable (datum) VALUES ('" & Convert.ToDateTime(dgvrow.Cells(0).Value).ToString("yyyy/MM/dd hh:mm:ss") & "'" & ")", conn) This works perfectly. After storing the dates I need to load /show them into a MonthCalendar. This is where the error occurs.
[Code]...
I have the following code to use Words spellcheck feature on a RTB. Once you pick the correct word in the spellcheck box and press change I get the error on th efollwoing line
strResult = Left(objDoc.Content, Len(objDoc.Content) - 1)
I tried to use CType() but still complains.
If (Len(t.Text) = 0) Then
'nahhhhhhhhhhh
Else
[Code]....
When setting the selection of a RichTextBox, the selected text is highlighted even though I set the HideSelection property to True. Once the RTB loses focus then the selected text is no longer highlighted. Programatically setting the focus to another control doesn't hide the selection, only physically clicking another control will hide it. So is there a way I can make the RTB not show the selection right from the start?
View 2 Repliesso I have added a database with 3 columns uniqueID, Site, and ServerI have displayed a site list from the Site column in a comboboxI want to set a variable based on the selection in the combobox
View 14 RepliesI just got into VB 2010 with SQL 2008 Server Report. I was able to create a report as my wish and it's vieable via direct url (URL). But I want to pass login Information and Selection parameters to the report. But I don't want to pass them thru URL, So I want to load them from the application (winform) and launch the report in iexplorer.
View 1 RepliesI am trying have a data grid selection populate a form. I am new to this.Basically I have a connection persistance object and I would like to call that and call a stored procedure with the value of the selection. The datagrid is bound to an object.
[Code]...
I have a listbox (20 Items) with multiselection and label that disply the selection and one button. So I wrote (it works fine)
[code]...
Now when I click on button the label show lets say Item2,Item5,Item10,How do I take off the last ","
somthing like that Item2,Item5,Item10
I used to do: Dim s As String = Trim(Label1.Text)Label1.Text = s.Substring(0, s.Length - 1) but it give me an error converting intiger to string
What is the VB Equivalent of the following C# boolean expression?data.GetType() == typeof(System.Data.DataView)Note: The variable data is declared as IEnumerable.
View 2 Replies