[C#] Getting a file's large icon

[yyy]

Hello,

I'm trying to get file icons using SHGetFileInfo (See attched image), but when I try to get the large icon of the file using SHGFI_LARGEICON, it returnes the 32x32 icon :( while I want to get the 48x48 icon.

I've figured out that if I set Windows to show large icons, I can use SHGFI_SHELLICONSIZE, but it doesn't work when Windows is set to show small icons :blink:

How can I always get the large 48x48 icon of a file? What do I need to use?

Thanks in advance for your help :)

[jojoey]

(reminds me a quicklaunch :happy: )

[Andareed]

Did you check SHDefExtractIcon?

Are you after an exe's icon or a default icon or the shell's icons?

[yyy]

Thanks for your answer :) However, I have no idea how to use SHDefExtractIcon with C#. Maybe you can tell me how?

I just want to get the large icon of any real file on the computer. I just want it to work like the Windows toolbar - it shows the icons of the files in a certain directory.

Any idea how I can use SHDefExtractIcon ?

[AndreasV]

Try to use the IExtractIcon interface (Extract method), instead of going thru the SHGetFileInfo() round-trip.

IExtractIcon::Extract(....) has a nIconSize parameter.

[Andareed]

You could try temporarily setting the icon sizes via SystemParametersInfo and SPI_GETICONMETRICS/SPI_SETICONMETRICS. Then call SHGetFileInfo, then restore the icon sizes.

[lexecutil]

I'd have to agree with AndreasV.. using IExtractIcon is the best method, though getting all the interfaces nessesary is a pain. :)

Dan

[yyy]

Setting the icons sizes just for this seems quite weird to me :blink: I don't think it's the way to do it but thanks for the creative idea :)

I have the same problem with IExtractIcon::Extract - I have no idea how to use it :( Can anybody show me an example? How do I use it in an application?

BTW, thanks for your suggestions :)

[AndreasV]

Here's how I do it:

HRESULT CPidl::GetParentShellFolder(IShellFolder** folder,LPCITEMIDLIST*

relativePidl, IShellFolder2** folder2)const
{
	ATLASSERT(m_Pidl != NULL);
	ATLASSERT(folder != NULL);

	HRESULT _hRes;

	if(folder == NULL)
	{
 ?_hRes = E_INVALIDARG;
	}
	else if(NULL == m_Pidl)
	{
 ?_hRes = E_FAIL;
	}
	else
	{
 ?*folder = NULL;

 ?LPCITEMIDLIST pidlChild = {0};

 ?HRESULT _hRes = ?SHBindToParent(m_Pidl,
 ? ? ? ? ? ? ? ? ? ? ? ? ? ?IID_IShellFolder, 
 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?(void**) folder, 
 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?const_cast<LPCITEMIDLIST*>(&pidlChild));

 ?if(relativePidl != NULL)
 ?{
 ?	*relativePidl = pidlChild;
 ?}

 ?if(folder2 != NULL)
 ?{
 ?	*folder2 = NULL;

 ?	if(SUCCEEDED(_hRes) && *folder != NULL)
 ? ?(*folder)->QueryInterface(IID_IShellFolder2,reinterpret_cast<void**>(folder2));
 ?}
	}

	return _hRes;
}


HICON CPidl::ExtractIcon(UINT size, UINT flags) const
{
	ATLASSERT(m_Pidl != NULL);

	if(NULL == m_Pidl)
 ?return NULL;

	CComPtr<IShellFolder> parentFolder;
	LPCITEMIDLIST relativePidl = NULL;

	HRESULT _hRes = GetParentShellFolder(&parentFolder,&relativePidl);

	if( FAILED(_hRes) )
 ?return NULL;

	CComPtr<IExtractIcon> extractIcon;
	_hRes = parentFolder->GetUIObjectOf(NULL,1,
const_cast<LPCITEMIDLIST*>(&relativePidl),
IID_IExtractIcon,NULL,reinterpret_cast<void**>(&extractIcon) );

	if( FAILED(_hRes) || NULL == extractIcon.p)
 ?return NULL;

	TCHAR location[MAX_PATH+2] = {0};
 // +2 fixes bogus shellextension off-by-one errors.
	int ? index(0);
	UINT outFlags(GIL_FORSHELL);

	_hRes = extractIcon->GetIconLocation(GIL_FORSHELL,
location,MAX_PATH,
&index,&outFlags);

	if( FAILED(_hRes) )
 ?return NULL;

	HICON smallIcon = {0};
	HICON largeIcon = {0};

	size = MAKELONG (size,size);

	_hRes = extractIcon->Extract(location,index,&largeIcon,&smallIcon,size);

	if( FAILED(_hRes) )
 ?return NULL;

	if(largeIcon != NULL)
	{
 ?DestroyIcon(smallIcon);
 ?return largeIcon;
	}
	else
	{
 ?return smallIcon;
	}

}

[yyy]

Thanks for the code but I don't know how to convert this code to C# :( I guess it's C++ but I need to do it with C#. Can you convert it to C# or at least tell me how I can do it?

[AndreasV]

Sorry, I have no idea how C# interops with COM. You should be able by reading the code, though, what the relevant COM interfaces and method-calls are.

[yyy]

Oh, OK. This is the problem - I just don't know how to convert it. Nevermind - it's not that important.

Thanks anyway :)

[AndreasV]

1) Get a PIDL to the file you want the icon of.

2) Get the IShellFolder parent of it and the relative PIDL.

3) Query that IShellFolder for an IExtractIcon (GetUIObjectOf) for the relative PIDL you have obtained in step2.

4) get the location of the object with IExtractIcon::GetIconLocation

5) Use that location to extract the icon with IExtractIcon::Extract(...) and give up the size as a long with the high word and low word of the long set as the size ( MAKELONG(size, size) ).

[lexecutil]

You will have to define all the nessesary interfaces (IShellFolder, IExtractIcon etc).. you should be able to find most of them on the internet around. :) Good luck!

Dan

[yyy]

Wow - I thouhgt it'll be easier :laugh: That's too complicated for me. I think I'll just use the small icons :)

Thanks again :)