How to prevent an app from being pinned in Windows 7?

Question

I am trying to prevent the user from pinning my .NET app to the taskbar. I've found some code on the Old New Thing that does just that. However, it is in C++.

#include <shellapi.h>
#include <propsys.h>
#include <propkey.h>

HRESULT MarkWindowAsUnpinnable(HWND hwnd)
{
 IPropertyStore *pps;
 HRESULT hr = SHGetPropertyStoreForWindow(hwnd, IID_PPV_ARGS(&pps));
 if (SUCCEEDED(hr)) {
  PROPVARIANT var;
  var.vt = VT_BOOL;
  var.boolVal = VARIANT_TRUE;
  hr = pps->SetValue(PKEY_AppUserModel_PreventPinning, var);
  pps->Release();
 }
 return hr;
}


BOOL
OnCreate(HWND hwnd, LPCREATESTRUCT lpcs)
{
 MarkWindowAsUnpinnable(hwnd);
 return TRUE;
}

I am having very little luck converting it to c#. Can someone help?

Answer 1

You can download the Windows API Code Pack which has the necessary p/invoke calls you need to translate the code in your post to C#.

Either use the library in whole or find the specific calls and definitions you require (search it for SHGetPropertyStoreForWindow and then its other dependencies).