I've created a bitmap on which I use setpixel to color it in. Then I display it on a picturebox. I want to clear the bitmap form time to time, reset all its pixels. I see no bitmap.clear() method and there's nothing in the documentation that seems. Short of disposing of or setting the bitmap = nothing and creating a new one, how do I wipe a bitmap?
View 8 RepliesWas just wondering if there is a way to quickly clear all pixels in a bitmap without creating a new one?
View 1 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
this is currently my code to clear my 5 textboxes
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
TextBox1.Clear()
TextBox2.Clear()
TextBox3.Clear()
TextBox4.Clear()
TextBox5.Clear()
End Sub
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
I have a timer that runs every time by itself, and for the code the runs in it I would like to have it clear the dataset before it does anything, the timer runs every 10 seconds, so I tried to do dataset.clear but it would crash if the dataset had no values
View 4 Repliesin hyper teriminal when i press "ctrl+L" is to clear terminal screen how to write the code in vb.net? Hyperterminal is connecting to serial comport.when i try this it work and return line on debug
serialport.writeline ("at+cmgl=1")
i try this but not work and it still show some lines on debug
serialport.writeline (vbcrtl +"L")
serialport.WriteLine("vbCrLf + l")
way to clear textboxes in VB.Net and what is the difference between the two methods? I have also seen people be critical of folk using clear objects on their forms and i can see why but in this case, i am only learning.
txtbox1.Clear()
or
txtbox1.Text = ""
wan to ask about anyone know the code about how to clear all the data inside the data grid view without clear the binding source...
View 1 RepliesThe code below reads an Icon from an .ico file, converts the Icon read to a Bitmap and saves the bitmap using:
Bitmap.Save(PathA)
Then does:
PanelShowWrittenIconA.BackgroundImage = New Bitmap(PathA)
[code].....
In my winform program (in vb.net) I wrote:
Dim dt As New DataTable
'Get data from DB into dt
'...
[Code].....
But when I run the program, Clear() cleared both dt and dttemp! Why? Aren't dt and dttemp supposed to be two distinct instances of DataTable?
(I finally found a solution - dttemp = dt.Copy() instead of dttemp = dt. But I still can't see why Copy() was necessary in this case.
I am using the StreamWriter to create a log file for my application. However I do not see a method on how to clear the file (make the file blank again). Also before I clear the file I want to rename it so that I can have multiple log files, a new one produced everytime the application runs.
[Code]...
I want to get a bitmap from a dll and load it to a picturebox. The bitmap I want is in Windowssystem32msgina.dll, the bitmap ID is 20150. (this bitmap contains shutdown, restart picture) Here's the code:
Private Declare Function LoadLibrary Lib "KERNEL32" Alias "LoadLibraryA" (ByVal strFilePath As String) As Long
Private Declare Function LoadBitmap Lib "USER32" Alias "LoadBitmapA" (ByVal hInstance As
[code].....
What resources I need to look for, to generate one png image out of three? Since there are sprite generators out there, that do not do what I want, I wanted to try by myself. The user interface should not be the problem, but i have no experience of generating bitmaps, especially those with transparent backgrounds. I will do that in .net. Letīs say I have 6 png files. I want to put them into one image, where there will be two rows of images in it, so 3 in row, 2 in height, 3*2. Every image might have a little different sizes, so i would need to fill up the space with, um, nothing..
View 1 Repliesexplain how Graphics.RotateTransform is working?
[Code]...
The following code works with smaller images, but it throws an out of memory exception when the image is a png file, 8 bit depth, 13200x10234 pixels.
Using FS As New IO.FileStream(FileName, IO.FileMode.Open, IO.FileAccess.Read)
Dim B = New Bitmap(System.Drawing.Bitmap.FromStream(FS))
End Using
I'm working on a viewer that shows an image, asks the user for a window and saves the cropped image. Here is an overview of what I'm trying to achieve: The process starts with a 30+MB pdf file containing hundreds of large technical drawings. I open the file with the pdf reader, save as png 300dpi images, then I run my application that works on the saved images. I am interested on a few details of those drawings, and I have two goals:
1) Use my viewer with a subset of details instead of the pdf reader with the full set of whole images, and
2) Pick some cropped details and insert them into another application.
I start the application, look at the first image, click delete, and keep clicking delete until I find an drawing with a detail that I need. Then I draw a rectangle, save the cropped image, and repeat with 3-4 more details on the same image. Then delete the original image, go to the next, and restart the cycle. So I start with 100 large images in my folder and end with 20 small ones. At this point I can browse them very quickly and continue with the following steps (inserting them in another application).
i want open image (png), re size and save it as png-8 with transparent i can re size and save it but this not as png-8 format !!i use this but receive this exeption
[code]...
I was wondering if it is possible to get a bitmap from a gfx... I am painting straight to a panel in the paint method I DO NOT want to have to paint to a bitmap then return that bitmap then paint this bitmap on the panel - as this is a lot slower I am doing this as i need to obtain a bitmap sometimes (if the user has requested it) 1/2 way through a draw eg the user says i want the picture after it has drawn the 3rd curve (just explaining why I want to do it this way)
View 5 RepliesI'm trying to resize a .NET bitmap without actually scaling the image. The idea here is to create a space above and below the image, fill it with a black rectangle, and place some text there (without covering up or destroying any part of the original image).
All the code and examples I've seen of this thus far just show how to scale the image, not expand the canvas. So far, everything I've tried on my own also scales/stretches the image.[code]....
I have the following code:
Private Function SizeLogo(ByVal logoBytes As Byte()) As Byte()
Using originalMemStream As MemoryStream = New MemoryStream(logoBytes),
originalImage As System.Drawing.Image = System.Drawing.Image.FromStream(originalMemStream)
[Code]....
What I am trying to do is
Create 300width and 200height white bitmap Draw and center image that was uploaded into center
My problem is I am unable to save the created image. Is this a conversion issue? I've highlighted code where I think I am failing at.
I need to save Bitmap object loaded from image file (.png, .jpeg, .bmp) and save it as an icon (.ico) to a separate file.
First I tried saving Bitmap object to a file with Icon ImageFormat:
using System.Drawing;
Bitmap bmp = (Bitmap)pictureBox1.Image;
bmp.Save(@"C:icon.ico", Imaging.ImageFormat.Icon);
This one fails, as the icon produced is not in a proper format and it cannot be used as an icon.
Next one was to get HIcon from Bitmap and save it to a file:
using System.Drawing;
using System.IO;
StreamWriter iconWriter = new StreamWriter(@"C:icon.ico");
[Code]....
This one does not do the job too. Although icon file is properly written, it has only 16 colors and a limited width and height.
I'd like to be able to write icons with custom width and height that would preserve colors from the original image. Is this possible to achive in .NET?
The error that I get is "Object reference not set to an instance of an object."[code]...
And is it even possible to do a vb6 style implementation? As I see it, this will clone the picture image while the vb6 implementation will just read directly off the image? and is lockbits like getdibits? I need to process 60 bitmap images of about 200pix by 200pix every second.
how can i convert a wpf bitmapframe to a bitmap?
View 1 RepliesHow to make a bitmap to an Icon? I have an image with png extension and want to convert it to an icon.[code]...
View 5 RepliesThis code resizes a jpeg image, but instead of saving it I simply want to display the result in a picturebox. I moused over the the image box and the value thumb and they seem to be different formats. How can i convert bitmap to image?
View 3 RepliesI have managed to take a screenshot of my computing using VB and I have stored it as a bitmap. I want to convert this bitmap (quickly!) to an array of rgb values.[code]...
View 1 RepliesI know how to copy a bitmap to a picturebox.image but how do I copy the bitmap to the form?
Example:
I want to create a form 1600x1200 and put a 1600x1200 image on the form to cover the entire surface.
Then I want to put several pictureboxes 256x40 (Tool Bars) at different locations on the form.
If pictureboxA is at x32, y32 on the form, I want to copy from the form at x32, y32 256x40 to the picturebox.image then draw
the buttons on the pictureboxA.
I know how to load a .jpg or .bmp to the form from a file. This won't work for my purpose.
If there is no fix for this then the only thing I could do would be to create the bitmap then save it to a file, then reload the file to the form. I want to avoid this... It takes up time :(