Why these two different ways of assigning a background image work differently?
When I load the image into an ImageList, and then reference the ImagaList.Images collection to set the background Image for a control, it looks llike crap. The smooth blend I had set up is stratified.
When I load the image directly from the Resource, it looks great.
I assume this has something to do with the bit depth of the image once it is stored in the Image list collection? Or some other conversion issue. However, I can't find a way to adjust these properties on the image list (They are read only).
I have a Class that has an Image as property. A (possibly very high) number of instances of this class are added to a List(Of thisClass).
In a For Each loop, a new ListViewItem is created for every instance of the class in that List. The Image property of the class should now be the Image of that ListViewItem.
Now, a ListViewItem does not take an Image directly. Instead, I need to assign an ImageList to the SmallImageList property of the ListView, with a specified Key, and assign an ImageKey property to the ListViewItem.
Of course, I could simply add the Image in the Image property of the class to the ImageList, generate a random Key string, and assign that string to the ImageKey property of the created ListViewItem.
That does work, and gives me the correct image for every ListViewItem. However, it is not a very good solution I think, because, in total, there might not be more than like 5 different images! But there may be a LOT of ListViewItems, so there are a lot of duplicate images.
To prevent storing the same image 9183 times in the ImageList, I thought I could generate a Key to use based on the image. If the same image is then encountered later in the loop, I can see that this Key is already in the ImageList, and I don't need to add it a second time. Because they Key is then equal to the 'old' image, already in the imagelist, it will automatically be used for this Listviewitem.
I thought I could use the GetHashCode property of the Image, but apparently not...
Here is my
[Code]....
I thought this would work, but apparently the GetHashCode function returns a different number, even for identical images. I know the images are identical because I tried this by specifying the SAME image object as the Image property of the class, a few times. The GetHashCode is different everytime.
So is there any other property I can use, that is unique for identical images, but different for different images? Or am I going about this completely the wrong way? Or shouldn't I worry that there can be up to 10.000 duplicate images in the Imagelist?
The user has been running the app in question for over a year with no issues like this (this is a VB2008 business/database application with an executable 4.6 MB in size). Starting last week, "all of a sudden", the user started getting INTERMITTENT error messages like the following:
Exception has been thrown by the target of an invocation. Creation of the ImageList handle did not succeed. Out of memory. Parameter is not valid.
The last two have been accompanied by the big "red cross" on the form (in the screen shots the user sent me).The fact that the one message mentions "ImageList" and poking around on the Internet for answer on "Parameter not valid" points in the direction of a graphic problem, but nothing has changed in this area for a long time, and the app only uses graphics in a very straightforward way, using images on buttons and menu items, but not doing any in-line graphics methods.
When i select an image randomly from an imagelist on my form and insert it into a picturebox, how can i stop that image from being selected again while the program is open ?
How can i stop the same image from been selected twice from my image list
[code]...
Im using this so randomly select an image and place it into a picturebox (box_1)I have 22 boxes and 22 images , how do i stop an images appearing twice ?
I'm trying to get the image's name from a imagelist..[code]ofcourse that "name" doesn't exists, and I'm trying to find out what another correct way to get the name of that image.
I have got an imagelist with many images, many of which have a critical name which can be changed in the desinger, however, since Im NOT using this imagelist in another control (e.g. tabcontrol) I am not able to use imagekey. Therefore, how am I able to get the name of an image in my imagelist?
Does anybody else think that it is just plain STUPID that you can add images to the imagelist at design time but you can't add a key?? What kind of brainless moron designed that?Now, everytime I change (add, delete, etc.) an image in the imagelist, I have to modify my code that accesses any image after the changed image(s). What REALLY boggles my mind is that it is still this way several years later. If I could at least access the image's name from code, then I could get by. But, NOOOOOO! That also would make too much sense
I'm in the process of replacing ActiveX ToolBar / ImageListwith the Toolbar / ImageList provided with the VB .Net 2003. The Bitmaps that were used originally to populate the imagelist are nowhere to be found.Is there a way to extract the bitmaps that are in the old imagelist back out to a .bmp file that can be used or to the new ImageList?Is there a way to extract bitmaps that have been placed in a PictureBox?
following line of code generating a compiler error in a User Control File [code]The compiler error is :can't find project or library/Why this error is thrown even though I have already registered Microsoft Visual Basic Common Control 6.0
im trying to add new images to an image list everytime a function is called. Im unable to clear the image list so im trying to create a new one each time the function executes.
Sub getActors(ByVal directory) 'Get actors and there names Dim di As New IO.DirectoryInfo(directory) Dim aryFi As IO.FileInfo() = di.GetFiles("*.jpg")
[code]....
how to clear an imagelist or how to implement a new imagelist
I want to be able to randomize what image the picture box displays, and I want to pick it from an Image list with the collection that I want to use. I'm trying to use a custom function so that it can be repeated.
How can i set an icon from imagelist to the property of .icon of TrayIcon?When I write TrayIcon.Icon = ImageList.Images(n) or ImageList.Images.Item(s) they give me an error with incompatability of image and icons format!How can I set different icons to TrayIcon from ImageList? Or there is a different component to do that?
I am using VB.net 2003 to work with a bunch of images. Using OpenFileDialog I populate an ImageList of image files. I can easily scroll through the images, but I would like to get a list of names of the image files so that I can work with these image files later in the program. I've looked at several good postings in the CodeBank, but have found nothing that I can figure out how to use for what I want. My 'textbook' on vb.net 2003 is Sams Teach Yourself Microsoft Visual Basic .Net 2003 in 21 days. While I view this book as excellent it does not give the info that I need in any way that I can figure out how to use,
I have a picture viewer with listbox,listview,picturebox. I used code snipets and modified them for about 3 weeks now. It works pretty good too i think. But when i add images as thumbnails to my imagelist from openfiledialog i can only add about 75 images any more and i will get a out of memory error. Or if I add say like 50 twice the second 50 added will have the right names but not the right image. My question is. Is there a way to load some images pause then load some more by code for about 250 images so that the loading could clean some memory? And or code where i could add aditional images to the imagelist? And i just cant stop trying to get this Picture viewer to work right.
I'm building a very small and minimalist Movie Collector application. In the Movie Adding dialog, you can select movie's poster. Movie poster is adding to the ImageList.Movies are listing in the main window as ListView thumbs (large view). First time is no problem;
No Problem after the adding but restarting program, no thumbs in the items.
I'm trying to figure out how I can change a ListView's "Large ImageList" to another one at runtime. For example I have it attached to my Icons_64x64 ImageList right now but would want an option to switch it to Icons_128x128 at runtime. Hope that makes sense and someone has an idea out there. I haven't been able to come up with anything at all.
Is there a way to create a user-defined ImageList? I would like the user to be able to assign images to ImageList that would be stored for use in future sessions.
