Improve company productivity with a Business Account.Sign Up

x
?
Solved

Get icons in ZIP-files

Posted on 1998-08-08
1
Medium Priority
?
206 Views
Last Modified: 2010-04-04
How do I get the icon of a file, compressed by ZIP?
My problem is that I need to get the image index of a file, using only the extension (*.exe, par example). The functions I've found requires the whole path + filename, and therefore needs uncompressed files.
0
Comment
Question by:jonassondaniel
1 Comment
 
LVL 20

Accepted Solution

by:
Madshi earned 400 total points
ID: 1361725
There's a tip I found last week on a homepage (I don't know anymore from what homepage...):

"System Icon Index From Extensions
I've seen this question a lot, and several asked me directly: How can I get the index of a system icon based only on the extension? It's pretty simple once you see it done, but I guess it is one of those things that's not readily apparent. I know it wasn't to me.

Assuming you are using some control that has an image list property that you assign, you first set that up so that it uses the system's image list. There is one thing abuot this that you must be very careful of; the system image list belongs to the system, and it (the list, not the component that "wraps" it) must not be freed. Following is a code snippet that properly creates the system image list, setting its ShareImages property which prevents the image list handle from being destroyed when the component is.

// This gets the system image list.
var
  SysIL: HImageList;
  SFI: TSHFileInfo;
begin
  // Create an image list component
  MyTreeView.Images := TImageList.Create(Self);
  // This gets the small image list.  Replace SHGFI_SMALLICON with
  // SHGFI_LARGEICON for large images.
  SysIL := SHGetFileInfo('', 0, SFI, SizeOf(SFI),
     SHGFI_SYSICONINDEX or SHGFI_SMALLICON);
  if SysIL <> 0 then begin
    // Assign the system list to the component
    Images.Handle := SysIL;
 // The following prevents the image list handle from being
 // destroyed when the component is.
    Images.ShareImages := TRUE;
  end;
end;

Now, given that we have the system image list to work with, we can get the image index to a file, whether it exists or not, by using SHGetFileInfo function with the SHGFI_USEATTRIBUTES flag. This looks like:

  function GetIconIndex(const AFile: string; Attrs: DWORD): integer;
  var
    SFI: TSHFileInfo;
  begin
    SHGetFileInfo(PChar(AFile), Attrs, SFI, SizeOf(TSHFileInfo),
                  SHGFI_SYSICONINDEX or SHGFI_USEFILEATTRIBUTES);
    Result := SFI.iIcon;
  end;

{...and to use this function...}

  // This will get the index to the folder image even though the
  //  directory doesn't exist.
  NewTreeItem.ImageIndex := GetIconIndex('c:\bogus\directory\',
     FILE_ATTRIBUTE_NORMAL or FILE_ATTRIBUTE_DIRECTORY);

  // This will get the index for .htm files image
  NewTreeItem.ImageIndex := GetIconIndex('notarealfile.htm',
     FILE_ATTRIBUTE_NORMAL);
That's it."
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
Watch the video of Kernel Migrator for SharePoint, which demonstrate the process easily of migration from SharePoint to SharePoint, OneDrive for Business & Google Drive servers, Public Folder to SharePoint, File Server to SharePoint. The tool has va…
Wrapper-1-Query. Use an Excel function to calculate a column for an Access query. Part 1. Shows a query in Access that has a calculated column with the results of an Excel worksheet function. See how to call a wrapper function from a query, and …

588 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question