Vb.net – Items icons with listview and imagelist

imagelistlistviewvb.net

Hello I've got a list view that opens items inside a folder and displays them. I want to know if there is a way to have the list view display the icons aswell, maybe using shell32 or an imagelist. Here's the code:

Imports System.IO
Imports System.Xml
Imports System.Runtime.InteropServices
Imports Microsoft.VisualBasic

Public Class cv7import

Private Sub cv7import_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim caminho As String
    caminho = "C:\Documents and Settings\Software\Ambiente de trabalho\1"



    lstvicon.View = View.Details
    lstvicon.GridLines = False
    lstvicon.FullRowSelect = True
    lstvicon.HideSelection = False
    lstvicon.MultiSelect = True


    lstvicon.Columns.Add("Nome")
    lstvicon.AutoResizeColumns(ColumnHeaderAutoResizeStyle.HeaderSize)

    Dim DI As System.IO.DirectoryInfo = New System.IO.DirectoryInfo(caminho)

    Dim files() As System.IO.FileInfo = DI.GetFiles

    Dim file As System.IO.FileInfo

    Dim li As ListViewItem
    For Each file In files
        li = lstvicon.Items.Add(file.Name)
        li.Tag = file.FullName
    Next
End Sub


End Class

Here's two images, of how it looks and how I want it to look, if it helps.

How I wanted: http://imageshack.us/photo/my-images/21/wantd.png/

How it looks: http://imageshack.us/photo/my-images/13/needk.png/

Best Answer

Well you need to find the extension of the file to start with:

Dim file As String = "C:\scratch\newfile.txt"
Dim ext as string = IO.Path.GetExtension(file)

Then you need to find this entry in the HKEY_CLASSES_ROOT section of the registry:

HKEY_CLASSES_ROOT\.txt

The default value in this key gives the file type associated with this file in my case txtfile (remember that different registries may have different values depending on what the user has set up and what programs are installed)

You then need to look up this values DefaultIcon key in HKEY_CLASSES_ROOT:

HKEY_CLASSES_ROOT\txtfile\DefaultIcon

The default value in here gives you the location of the icon and the icon number in my case:

%SystemRoot%\system32\imageres.dll,-102

From this point I think you may need to rely on the ExtractIconEX API to extract the icon. This link may also be of use

Related Solutions

Android – How to lazy load images in ListView in Android

Here's what I created to hold the images that my app is currently displaying. Please note that the "Log" object in use here is my custom wrapper around the final Log class inside Android.

package com.wilson.android.library;

/*
 Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements.  See the NOTICE file
distributed with this work for additional information
regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
*/
import java.io.IOException;

public class DrawableManager {
    private final Map<String, Drawable> drawableMap;

    public DrawableManager() {
        drawableMap = new HashMap<String, Drawable>();
    }

    public Drawable fetchDrawable(String urlString) {
        if (drawableMap.containsKey(urlString)) {
            return drawableMap.get(urlString);
        }

        Log.d(this.getClass().getSimpleName(), "image url:" + urlString);
        try {
            InputStream is = fetch(urlString);
            Drawable drawable = Drawable.createFromStream(is, "src");


            if (drawable != null) {
                drawableMap.put(urlString, drawable);
                Log.d(this.getClass().getSimpleName(), "got a thumbnail drawable: " + drawable.getBounds() + ", "
                        + drawable.getIntrinsicHeight() + "," + drawable.getIntrinsicWidth() + ", "
                        + drawable.getMinimumHeight() + "," + drawable.getMinimumWidth());
            } else {
              Log.w(this.getClass().getSimpleName(), "could not get thumbnail");
            }

            return drawable;
        } catch (MalformedURLException e) {
            Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);
            return null;
        } catch (IOException e) {
            Log.e(this.getClass().getSimpleName(), "fetchDrawable failed", e);
            return null;
        }
    }

    public void fetchDrawableOnThread(final String urlString, final ImageView imageView) {
        if (drawableMap.containsKey(urlString)) {
            imageView.setImageDrawable(drawableMap.get(urlString));
        }

        final Handler handler = new Handler() {
            @Override
            public void handleMessage(Message message) {
                imageView.setImageDrawable((Drawable) message.obj);
            }
        };

        Thread thread = new Thread() {
            @Override
            public void run() {
                //TODO : set imageView to a "pending" image
                Drawable drawable = fetchDrawable(urlString);
                Message message = handler.obtainMessage(1, drawable);
                handler.sendMessage(message);
            }
        };
        thread.start();
    }

    private InputStream fetch(String urlString) throws MalformedURLException, IOException {
        DefaultHttpClient httpClient = new DefaultHttpClient();
        HttpGet request = new HttpGet(urlString);
        HttpResponse response = httpClient.execute(request);
        return response.getEntity().getContent();
    }
}

Android – Background ListView becomes black when scrolling

Add an attribute on the ListView Tag

android:cacheColorHint="#00000000" // setting transparent color

For more details check this blog

Best Answer

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Android – How to lazy load images in ListView in Android

Android – Background ListView becomes black when scrolling

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