public unsafe static bool CreateActivationContext(string dllPath, int nativeResourceManifestID)
{
lock (typeof(ThemingScope))
{
if (!s_contextCreationSucceeded)
{
fixed(char *pDllPath = dllPath)
{
s_enableThemingActivationContext = new Kernel32.ACTCTXW
{
cbSize = (uint)Marshal.SizeOf <Kernel32.ACTCTXW>(),
lpSource = pDllPath,
lpResourceName = (IntPtr)nativeResourceManifestID,
dwFlags = Kernel32.ACTCTX_FLAG.RESOURCE_NAME_VALID
};
s_hActCtx = Kernel32.CreateActCtxW(ref s_enableThemingActivationContext);
}
s_contextCreationSucceeded = (s_hActCtx != new IntPtr(-1));
}
return(s_contextCreationSucceeded);
}
}
public unsafe static bool CreateActivationContext(Stream manifest)
{
lock (typeof(ThemingScope))
{
if (!s_contextCreationSucceeded)
{
string tempFilePath = Path.Join(Path.GetTempPath(), Path.GetRandomFileName());
using FileStream tempFileStream = new FileStream(
tempFilePath,
FileMode.CreateNew,
FileAccess.ReadWrite,
FileShare.Delete | FileShare.ReadWrite);
manifest.CopyTo(tempFileStream);
// CreateActCtxW gives a sharing violation if we have the handle open
tempFileStream.Close();
fixed(char *p = tempFilePath)
{
s_enableThemingActivationContext = new Kernel32.ACTCTXW
{
cbSize = (uint)sizeof(Kernel32.ACTCTXW),
lpSource = p
};
s_hActCtx = Kernel32.CreateActCtxW(ref s_enableThemingActivationContext);
}
s_contextCreationSucceeded = (s_hActCtx != new IntPtr(-1));
try
{
File.Delete(tempFilePath);
}
catch (Exception e) when(e is UnauthorizedAccessException or IOException)
{
// Don't want to take down WinForms if we can't delete is file
}
}
return(s_contextCreationSucceeded);
}
}
}
private unsafe void ExecuteWithActivationContext(string applicationManifest, Action action)
{
var context = new Kernel32.ACTCTXW();
IntPtr handle;
fixed(char *p = applicationManifest)
{
context.cbSize = (uint)sizeof(Kernel32.ACTCTXW);
context.lpSource = p;
handle = Kernel32.CreateActCtxW(ref context);
}
if (handle == IntPtr.Zero)
{
throw new Win32Exception();
}
try
{
if (Kernel32.ActivateActCtx(handle, out var cookie).IsFalse())
{
throw new Win32Exception();
}
try
{
action();
}
finally
{
if (Kernel32.DeactivateActCtx(0, cookie).IsFalse())
{
throw new Win32Exception();
}
}
}
finally
{
ReleaseActCtx(handle);
}
}
public unsafe static bool CreateActivationContext(IntPtr module, int nativeResourceManifestID)
{
lock (typeof(ThemingScope))
{
if (!s_contextCreationSucceeded)
{
s_enableThemingActivationContext = new Kernel32.ACTCTXW
{
cbSize = (uint)sizeof(Kernel32.ACTCTXW),
lpResourceName = (IntPtr)nativeResourceManifestID,
dwFlags = Kernel32.ACTCTX_FLAG.HMODULE_VALID | Kernel32.ACTCTX_FLAG.RESOURCE_NAME_VALID,
hModule = module
};
s_hActCtx = Kernel32.CreateActCtxW(ref s_enableThemingActivationContext);
s_contextCreationSucceeded = (s_hActCtx != new IntPtr(-1));
}
return(s_contextCreationSucceeded);
}
}