1.1 equivalent for Drawing.Icon.ExtractAssociatedIcon?

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Pieter - 02 Oct 2006 14:23 GMT

Hi,

I need to have the icon of the assembly that is calling my Control.Library.
Using 2.0 Framework the "Drawing.Icon.ExtractAssociatedIcon" does the trick.
But this fucntion doesn't exist in the .NET 1.1 Framework, and my control
Library must be able to be compiled in 1.1 too.

Does anybody knows the solution?

thanks a lot in advance,

Pieter

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Dmytro Lapshyn [MVP] - 02 Oct 2006 14:55 GMT

Hi,

Create a P/Invoke declaration for the ExtractIcon API function, then use
Icon.FromHandle and pass the handle ExtractIcon returned as the parameter.

Ready-made P/Invoke declaration can be found here:

http://www.pinvoke.net/default.aspx/shell32/ExtractIcon.html

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Regards,
Dmytro Lapshyn [MVP]
http://blogs.vbcity.com/DmytroL

> Hi,
>
[quoted text clipped - 9 lines]
>
> Pieter

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Pieter - 02 Oct 2006 16:06 GMT

Ok thanks!

This worked for me:

Declare Function ExtractIcon Lib "shell32.dll" Alias "ExtractIconA" (ByVal
hInst As Integer, ByVal lpszExeFileName As String, ByVal nIconIndex As
Integer) As IntPtr
Dim ico As Icon

Dim hIcon As IntPtr ' handle to the icon once it is extracted

hIcon =
ExtractIcon(Microsoft.VisualBasic.Compatibility.VB6.GetHInstance.ToInt32,
ConfigParentAssembly.Location, 0)

ico = Icon.FromHandle(hIcon)

m_ConfigIcon = New Icon(ico, New Size(16, 16))

(ConfigParentAssembly is the System.Reflection.assembly which is calling the
dll, and m_ConfigIcon an Icon-variable.)

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Chris Taylor - 02 Oct 2006 22:48 GMT

Hi,

One thing to note. When you use FromHandle, the new Icon instance does not
take ownership of the
handle. This means that when the Icon instance is disposed the handle is not
released, resulting in a resource leak.

You need to call DestroyIcon on the original handle, this will of course
invalidate the icon handle referenced by the Icon instance, so what you need
to do is first clone the icon which will create a new Icon instance which
owns the new Icon handle, allowing you to free the original handle.

ico = Icon.FromHandle(hIcon).Clone();
DestroyIcon(hIcon); // You need to pinvoke DestroyIcon.

Hope this helps

Signature

Chris Taylor
http://dotnetjunkies.com/weblog/chris.taylor

> Ok thanks!
>
[quoted text clipped - 17 lines]
> (ConfigParentAssembly is the System.Reflection.assembly which is calling
> the dll, and m_ConfigIcon an Icon-variable.)

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Pieter - 03 Oct 2006 08:35 GMT

ok thanks for the hint!

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Chris Taylor - 03 Oct 2006 18:15 GMT

Hi,

I did a quick google search and came up with this.
http://www.codeproject.com/system/winlogon_notification_package.asp

Hope this helps

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Chris Taylor
http://dotnetjunkies.com/weblog/chris.taylor

> ok thanks for the hint!

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Chris Taylor - 03 Oct 2006 18:31 GMT

Oops sorry, wrong thread