Image loading problem

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I wrote a program, that shows my images and their data (date, camera model, ISO, ...). If there is a GPS tag it also show's the map, where the picture was taken.

The problem:

The picture show's up after all data has been loaded, including the map.

But I want to get the picture as soon as possible and the data can show's up later.
I tried to solve the problem with backgroundWorker, but it doesn' work.

Here is the code for loading the picture:

C++

pictureBox1.ImageLocation = photosPath + "\\" + listView1.Items[CurPic-1].Text;
this.Refresh();        //I also tried to refresh the form, picture box, ...
pictureBox1.Refresh();
Application.DoEvents();
lblName.Text = listView1.Items[CurPic - 1].Text; //the name of the current pic
lblGPS.Text = "/";          //In case, there is no GPS tag - write /
loadData.RunWorkerAsync();

The background worker calls two methods:

C++

private void loadData_DoWork(object sender, DoWorkEventArgs e)
        {
            show_info(pictureBox1.ImageLocation);   //loading data
            showlocation(getlocation(pictureBox1.ImageLocation));   //getting location and showing map
        }

This code works, just the same as without background worker. Is there any other way to solve this. Please help.

Posted 24-Dec-12 6:23am

Rddezh

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Ravi Bhavnani · Accepted Answer · 2012-12-24T06:45:00

Solution 1

Try this (warning: will block the UI!):

C#

pictureBox1.WaitOnLoad = true;
pictureBox1.Load ("...");

/ravi

Posted 24-Dec-12 6:45am

Ravi Bhavnani

Comments

Rddezh 24-Dec-12 13:00pm

It still takes a few moments to load but it is much better. Thank you, very much!

Ravi Bhavnani 24-Dec-12 13:11pm

You may want to consider having a background thread load images (into Image objects), then set the loaded Image into the PictureBox. This has 2 advantages: (1) your UI will not be locked and (2) the image file will not be locked by the .NET PictureBox. See this method:

///

/// Loads an image from a file without locking the file.

///

/// <param name="filename">The filename.</param>

/// <returns>The image.

public static Image ImageFromFile (string filename)

{

using (FileStream stream = new FileStream (filename, FileMode.Open, FileAccess.Read)) {

return Image.FromStream (stream); }

}/ravi

PS: Please rate my answer if you find it useful. Thanks.

Rddezh 24-Dec-12 13:17pm

Right now, I'm making a class Photo. In this class I have all data about image and the image itself.

Then I will create an array of this class. It will hold 3 images - current one, the next one and the previous one. After moving to another picture I will be able to load the image directly from the class and load the next one in the background.

So thanks for all help.

Ravi Bhavnani 24-Dec-12 13:22pm

Cool! I've been building something similar (a basic photo cataloger). Will post an article on CP one of these days.

/ravi