📎 AI Summary:
The thread discusses an issue with image display in Windows app code, where disposing of the input stream too early causes images not to display. The original poster seeks advice on proper resource disposal timing to prevent memory leaks. A response recommends delaying the disposal of the IRandomAccessStream until after the image has fully loaded, suggested by awaiting the image load completion, thus ensuring correct display and efficient memory management.
H

Hagit

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Jul 1, 2012
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1
Thread Author #1
Hi,

I am loading images manually in my code as follows:
When I call inStream.Dispose sometimes the images are not displayed.
It seems that the file is disposed before the bitmap image completed to copy it.
When should I dispose my fine in order to avoid memory leaks?

private async Task LoadBitmap(string path, BitmapImage bi)
{

bi.DecodePixelWidth = DecodeWidth;
//bi.CacheOption = BitmapCacheOption.OnLoad;
//bi.UriSource = new Uri(path, UriKind.RelativeOrAbsolute);
StorageFile file = null;
try
{
var uri = new Uri(path);
file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(uri);

}
catch (Exception)
{
}
if (file == null)
{
file = await ApplicationData.Current.RoamingFolder.GetFileAsync(path);
}
if (file != null)
{
IRandomAccessStream inStream = await file.OpenReadAsync();
try
{
bi.SetSource(inStream);
}
finally
{
//inStream.Dispose();
}
}

}
 

Solution
WindowsForum AI
To avoid memory leaks and ensure that your images are displayed correctly, you need to consider the lifecycle of the objects involved, particularly the IRandomAccessStream and the BitmapImage objects. In your code snippet, you are loading the image into a BitmapImage object using an IRandomAccessStream. The issue you are facing with images not displaying properly might be related to premature disposal of resources. Here are a few recommendations to address these issues: 1. Disposing Resources: - The IRandomAccessStream object should ideally be disposed off once it's no longer needed. However, in your case, you are facing issues when disposing it. This might be due to the fact that the image loading...
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WindowsForum AI

WindowsForum AI

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114,163
#2
To avoid memory leaks and ensure that your images are displayed correctly, you need to consider the lifecycle of the objects involved, particularly the IRandomAccessStream and the BitmapImage objects. In your code snippet, you are loading the image into a BitmapImage object using an IRandomAccessStream. The issue you are facing with images not displaying properly might be related to premature disposal of resources. Here are a few recommendations to address these issues: 1. Disposing Resources: - The IRandomAccessStream object should ideally be disposed off once it's no longer needed. However, in your case, you are facing issues when disposing it. This might be due to the fact that the image loading operation is asynchronous and the stream is disposed before the image is fully loaded. - Instead of disposing the IRandomAccessStream immediately after calling bi.SetSource, you can try keeping it alive until the image loading operation is completed. 2. Handling Image Loading Asynchronously: - Since loading images is an asynchronous operation, you should ensure that the stream remains accessible until the image loading process is completed. Disposing the stream immediately might interfere with the loading process. - Consider waiting for the BitmapImage to finish loading the image before disposing the stream. Here’s an updated version of your LoadBitmap method where the stream is disposed after the image loading is completed:
C#: 
private async Task LoadBitmap(string path, BitmapImage bi) { bi.DecodePixelWidth = DecodeWidth; // Load the file StorageFile file = null; try { var uri = new Uri(path); file = await Windows.Storage.StorageFile.GetFileFromApplicationUriAsync(uri); } catch (Exception) { } if (file == null) { file = await ApplicationData.Current.RoamingFolder.GetFileAsync(path); } if (file != null) { IRandomAccessStream inStream = await file.OpenReadAsync; try { // Set the source of the BitmapImage bi.SetSource(inStream); // Do not dispose the stream here, wait for the image to finish loading // Optionally, you can wait for the image to finish loading await bi.ImageOpenedAsync; } finally { // Now that the image loading is completed, dispose the stream inStream.Dispose; } } }
By waiting for the image loading to complete using bi.ImageOpenedAsync, you ensure that the stream is not disposed prematurely. This approach should help in avoiding memory leaks and ensure that your images are displayed correctly.
 

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