I need a full VB .Net example of how to start with a 24 bit color bitmap, change i to a paletted 8 bit color PNG, and save it. The Microsoft documentation I have found iincomprehensible and has no good working examples.
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How to create and save screenshot to PNG file? Lang:VB or C# (VS2008)
View 2 Replieshow to create a bitmap image of a specified size? then how to save and reload such a bitmap to and from a file?VB2005 starter
View 1 RepliesI'm trying to save files in a new folder that get created and then copy 2 other files that are in my resources to that folder. I get this error:
Quote:
UnauthorizedAccessException was unhandled: Access to the path 'C:UsersMike.Mike-PCDesktopJava IDE' is denied.
This is my code:
Code:
Dim desktopPath As String = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory)
Dim sdlg As New SaveFileDialog
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I'm currently working on a program to store files and information. I'm wanting the program to be able to have multi-user logins i.e. there are numerous combinations of usernames and Passwords. I've created a program that will create new accounts and save them in a .bin file (in the form Username Password). However, now I need to use the user accounts to grant access to a form.
View 1 RepliesI am trying to use the BGW to save a DGV to excel file, but don't know how to do it correctly, specifically setting the savefile name this code doesn't work gives me:
'System.Runtime.InteropServices.COMException' occurred
- Make sure the specified folder exists.
- Make sure the folder that contains the file is not read-only.
- Make sure the file name does not contain any of the following characters:
Ensure that your Main function has STAThreadAttribute marked on it. This exception is only raised if a debugger is attached to the process. I also tried doing the Save in the BGW RunWorker Completed event but then there is no file name. It seems I need to pass the file name the user inputs in the SaveFileDialog to the BWG WorkerCompleted event somehow
Private Sub excelexp_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles excelexp.Click
ProgressBar2.Visible = True
Saving.Visible = True
Dim saveFileDialog1 As New SaveFileDialog()
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I would like to use code to create a checkbox with default properties and place it at a certain position in a groupbox. For example, i would like to do this by pressing a button and that i can give in the name and tag by use of an imputbox. Also, i have noticed that if something like this is done, these changes aren't permanent and don't apply to the designer nor the code in VB. Is there a way to let the newly created checkboxes appear in the designer? And what about permanently deleting checkboxes by pressing a button. With "Dispose()" it isn't deleted from the designer...
View 2 RepliesI'm drawing a chart in a pictruebox with a sub called Techart. After that I'm trying to turn the drawing into a bitmap, so that it will be persistant and also so that I'll be able to save it. This is what I've got from searching the forum:
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I have a VB.net applications that runs on XP and creates a directory and creates an Excell workbook and saves it. But when I do the same in Vista , when it tries to create a directory to save the excel workbook, it gives me an error that the directory does not exist. If I create the directory manually, it still gives me the same error. Is there a COM call for office 2007 on Vista other than worksheet.SaveAs(FileName:=path). All else works on Vista apart from creating a directory and Saving Excell Worksheet.
Public Function createDirectory(ByVal path As String) As String
Dim new_path As String
Try
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i am trying to create a form in VS using ASP that when upon submitting a form the details will get automatically stored in an xml file which can be accessed later on a chosen file save path.i have 2 files ... "Contact.aspx" and "Contact.aspx.vb".i have created the form in the "Contact.aspx" and when trying to enter the fields in the "contact.aspx.vb" i keep getting several errors such as for example...
Error 5 'Formatting' is not a member of 'System.Web.UI.WebControls.XmlBuilder'
Error 6 'WriteStartDocument' is not a member of 'System.Web.UI.WebControls.XmlBuilder'.
Error 7 'WriteComment' is not a member of 'System.Web.UI.WebControls.XmlBuilder'.
Error 8 'WriteStartElement' is not a member of 'System.Web.UI.WebControls.XmlBuilder'.
Error 10 'WriteAttributeString' is not a member of 'System.Web.UI.WebControls.XmlBuilder'.
there is like 30 errors in total... im literally stuck out my head been trying for 2 days now and can't grasp what im doing wrong ive tried even some of the tutorials online but loads of errors...
This is my first attempt at creating a Winforms application, and I have been developing in the .Net Framework (Silverlight, ASP.Net, WPF) for about 6 months. So, my appologies if this is a newbie question.
Basically what I am doing right now is taking the drawings of a stylus-based input, and storing them into an image field in a SQL Server database. Then, in another form, I go and get that image out of the database, and load it into a picture box. It works, but it is rather "sloppy" how it got there.When the user clicks save, it stores that image into a temporary folder, then converts it to a byte array and throws it into the database that way. Then, it deletes the file from the temporary folder. When retrieving it, it pulls it out of the database in a byte array, then converts it to an image in a temporary folder, thus displaying it on the form.
Is there a way that I can just bypass the storing of the file onto the user's harddrive both times, and go from byte array to picturebox?
Currently I am saving data from my applications by saving a text file via a stream reader as a string. I have come to a problem. In my current application, I have an array of the following structure:
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I have a problem. I'm working on this advanced web browser with my friend, and we made a favorites feature. So, it works and all that, but, after I close the executable file, it doesn't save anything!
Ex:Starting Up, adding Google as new favorites, then closing the browser. Starting up again, 1 hour later, but there's no Google Here's what I put for saving the favorites (please do not steal the code Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
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rewriting a class I use for saving Treeview data to a XML file for use of saving ListView data I can't really figure out the rewrite, I'm stucked, unfortunately Listviews seems to be a big problem for me in general.
Option Strict On
''' <summary>
''' The TreeViewDataAccess class allows the nodes within a TreeView to be
''' persisted to xml for later retrevial.
''' </summary>
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please tell me what is below code doing? is it creating array with two values or its creating to string index which will take value later? [code]
View 4 Replieshow would i go about saving DataGridView data to an Xml from wich it loaded its dataset??
At the minute im loading my dataset like so;
'Create XML Reader for quotes
Dim FilePath As String = SavePath
Dim dgvDataSet As New DataSet("Quotes")
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Now if i edited a quoute, how would i commit the changes in a seperate click event handler??
The RPG is very simple, and I do not know how to save, or where to start
View 2 RepliesI have managed to create a connection to the database and am able to save information to it from my form, the form contains 22 textboxes, a save and another exit button. I have set the form to retrieve data in the form_load. I have used the "UPDATE" SQL command on the save button and it does save the data on all 22 textboxes (all textboxes are linked to their separate columns). But only one record will be needed that is why I did not use the "INSERT" command.
The problem arises when I click the save button, all (19) textboxes are saved but when I retrieve the text (by reloading the form), each of the 20, 21, 22 textboxes (only) the text of the 20th textbox keeps on moving tho the next textbox e.g. 20>21>22>20>21>22 is interchanged amongst themselves.
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I've a project called G.S.S. There's a 2 forms in the G.S.S and a checkbox on the form2. I added these codes:[code]Then I created an another example project to try these on, added 2 forms, a checkbox on form2 and wrote same codes. I wondered when I run the app because it's running perfect. It saves the settings.So what's wrong with my G.S.S project?
View 5 RepliesI have a datagridview which has columns which are bounded and unbounded. My problem is when the user enters several rows in the dgv, only the data found in last row is saved in the access table. For example, if the user enters 2 rows of data, when he clicks the save button, there are 2 rows saved in the access table but both rows contain the data of the last row in the dgv. Below is the code of the save button.
Private Sub btn_Save_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Save.Click
For Each dr As DataGridViewRow In dgv_RMS.Rows
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How could I create a bitmap which is initially completely transparent. I would then like to do some drawing to it, like g.drawImage() and then I would like to save it as a png. How could I do this?
View 1 Repliescreated my own toolbar (customized an vb ide toolbar)
View 4 RepliesAll i need to do is save the project when i done, But it keeps updating.
View 7 Repliescan u see what is the error in this code because it not saving in the data base the error is Data type mismatch in criteria expression.
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I am trying to use the Tag property of a control to save it's value so I can reuse the new value when the program runs again.[code]I am trying to use this like the projects settings property where you can save your settings and they will come back when the program runs again. (my.settings.save) Perhaps the Tag property won't work like this. Maybe I just don't understand it.
View 7 RepliesI want to make a button that opens a program. Just for the sake of this post, we'll call the program Notepad.I want the users of my program to open Notepad, but not everyone saves Notepad in the same location. Is it possible to save a value (and the text in the TextBox) so the user doesn't have to retype it every time the program loads?
View 4 RepliesWhat is the code to save changes made in a project to a database (MS Access).I have a program which is a database controller for DVDs that I own, and I have all the text boxes etc there, but I have no idea how to save records to the database.
View 1 RepliesWhy it says Connection Property has not been initialized ?
PublicSub save()
Dim con AsNew OleDb.OleDbConnection
Dim adapter = New OleDb.OleDbDataAdapter
Dim cmd AsNew OleDb.OleDbCommand
Dim sqlQuery AsString
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I've been working with Editing a jpg through Hex. I have the code to open the hex of a file, but I just need to know how to write the file so it is able to be viewed as the same jpg. Editing aside, I just need to know how to write the file. Here's the code I have so far.
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which datatype can i use 4 a variable to save an image in vb.net .so that i can use this variable later in other forms?
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