/// <summary>
/// Loads a picture from the requested stream.
/// </summary>
private void LoadPicture(UnsafeNativeMethods.IStream stream)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
try
{
Guid g = typeof(UnsafeNativeMethods.IPicture).GUID;
UnsafeNativeMethods.IPicture picture = null;
try
{
picture = UnsafeNativeMethods.OleCreateIPictureIndirect(null, ref g, true);
UnsafeNativeMethods.IPersistStream ipictureAsIPersist = (UnsafeNativeMethods.IPersistStream)picture;
ipictureAsIPersist.Load(stream);
if (picture != null && picture.GetPictureType() == NativeMethods.Ole.PICTYPE_ICON)
{
IntPtr cursorHandle = picture.GetHandle();
Size picSize = GetIconSize(cursorHandle);
if (DpiHelper.IsScalingRequired)
{
picSize = DpiHelper.LogicalToDeviceUnits(picSize);
}
handle = SafeNativeMethods.CopyImage(
new HandleRef(this, cursorHandle),
NativeMethods.IMAGE_CURSOR,
picSize.Width,
picSize.Height,
0);
ownHandle = true;
}
else
{
throw new ArgumentException(string.Format(SR.InvalidPictureType,
"picture",
"Cursor"), "picture");
}
}
finally
{
// destroy the picture...
if (picture != null)
{
Marshal.ReleaseComObject(picture);
}
}
}
catch (COMException e)
{
Debug.Fail(e.ToString());
throw new ArgumentException(SR.InvalidPictureFormat, "stream", e);
}
}
public override object ConvertNativeToManaged(object nativeValue, Com2PropertyDescriptor pd)
{
if (nativeValue == null)
{
return(null);
}
Debug.Assert(nativeValue is UnsafeNativeMethods.IPicture, "nativevalue is not IPicture");
UnsafeNativeMethods.IPicture nativePicture = (UnsafeNativeMethods.IPicture)nativeValue;
IntPtr handle = nativePicture.GetHandle();
if (lastManaged != null && handle == lastNativeHandle)
{
return(lastManaged);
}
lastNativeHandle = handle;
//lastPalette = nativePicture.GetHPal();
if (handle != IntPtr.Zero)
{
switch (nativePicture.GetPictureType())
{
case NativeMethods.Ole.PICTYPE_ICON:
pictureType = typeof(Icon);
lastManaged = Icon.FromHandle(handle);
break;
case NativeMethods.Ole.PICTYPE_BITMAP:
pictureType = typeof(Bitmap);
lastManaged = Image.FromHbitmap(handle);
break;
default:
Debug.Fail("Unknown picture type");
break;
}
pictureRef = new WeakReference(nativePicture);
}
else
{
lastManaged = null;
pictureRef = null;
}
return(lastManaged);
}
/// <devdoc>
/// Loads a picture from the requested stream.
/// </devdoc>
private void LoadPicture(UnsafeNativeMethods.IStream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
try {
Guid g = typeof(UnsafeNativeMethods.IPicture).GUID;
UnsafeNativeMethods.IPicture picture = null;
new SecurityPermission(SecurityPermissionFlag.UnmanagedCode).Assert();
try {
picture = UnsafeNativeMethods.OleCreateIPictureIndirect(null, ref g, true);
UnsafeNativeMethods.IPersistStream ipictureAsIPersist = (UnsafeNativeMethods.IPersistStream)picture;
ipictureAsIPersist.Load(stream);
if (picture != null && picture.GetPictureType() == NativeMethods.Ole.PICTYPE_ICON)
{
IntPtr cursorHandle = picture.GetHandle();
Size picSize = GetIconSize(cursorHandle);
handle = SafeNativeMethods.CopyImageAsCursor(new HandleRef(this, cursorHandle), NativeMethods.IMAGE_CURSOR,
picSize.Width, picSize.Height, 0);
ownHandle = true;
}
else
{
throw new ArgumentException(SR.GetString(SR.InvalidPictureType,
"picture",
"Cursor"), "picture");
}
}
finally {
CodeAccessPermission.RevertAssert();
// destroy the picture...
if (picture != null)
{
Marshal.ReleaseComObject(picture);
}
}
}
catch (COMException e) {
Debug.Fail(e.ToString());
throw new ArgumentException(SR.GetString(SR.InvalidPictureFormat), "stream", e);
}
}