public void SetPropertyItem(PropertyItem propitem)
{
if (propitem == null)
{
throw new ArgumentNullException(nameof(propitem));
}
int nItemSize = Marshal.SizeOf(propitem.Value[0]);
int size = nItemSize * propitem.Value.Length;
IntPtr dest = Marshal.AllocHGlobal(size);
try
{
GdipPropertyItem pi = new GdipPropertyItem();
pi.id = propitem.Id;
pi.len = propitem.Len;
pi.type = propitem.Type;
Marshal.Copy(propitem.Value, 0, dest, size);
pi.value = dest;
unsafe
{
int status = Gdip.GdipSetPropertyItem(nativeImage, &pi);
Gdip.CheckStatus(status);
}
}
finally
{
Marshal.FreeHGlobal(dest);
}
}
public PropertyItem GetPropertyItem(int propid)
{
int propSize;
IntPtr property;
PropertyItem item = new PropertyItem();
GdipPropertyItem gdipProperty = new GdipPropertyItem();
int status;
status = Gdip.GdipGetPropertyItemSize(nativeImage, propid,
out propSize);
Gdip.CheckStatus(status);
/* Get PropertyItem */
property = Marshal.AllocHGlobal(propSize);
try
{
status = Gdip.GdipGetPropertyItem(nativeImage, propid, propSize, property);
Gdip.CheckStatus(status);
gdipProperty = (GdipPropertyItem)Marshal.PtrToStructure(property,
typeof(GdipPropertyItem));
GdipPropertyItem.MarshalTo(gdipProperty, item);
}
finally
{
Marshal.FreeHGlobal(property);
}
return(item);
}
internal static void MarshalTo(GdipPropertyItem gdipProp, PropertyItem prop)
{
prop.Id = gdipProp.id;
prop.Len = gdipProp.len;
prop.Type = gdipProp.type;
prop.Value = new byte[gdipProp.len];
Marshal.Copy(gdipProp.value, prop.Value, 0, gdipProp.len);
}
internal unsafe static extern Status GdipSetPropertyItem (IntPtr image, GdipPropertyItem *propertyItem);
public PropertyItem GetPropertyItem(int propid)
{
int propSize;
IntPtr property;
PropertyItem item = new PropertyItem ();
GdipPropertyItem gdipProperty = new GdipPropertyItem ();
Status status;
status = GDIPlus.GdipGetPropertyItemSize (nativeObject, propid,
out propSize);
GDIPlus.CheckStatus (status);
/* Get PropertyItem */
property = Marshal.AllocHGlobal (propSize);
try {
status = GDIPlus.GdipGetPropertyItem (nativeObject, propid, propSize, property);
GDIPlus.CheckStatus (status);
gdipProperty = (GdipPropertyItem) Marshal.PtrToStructure (property,
typeof (GdipPropertyItem));
GdipPropertyItem.MarshalTo (gdipProperty, item);
}
finally {
Marshal.FreeHGlobal (property);
}
return item;
}
internal static void MarshalTo (GdipPropertyItem gdipProp, PropertyItem prop)
{
prop.Id = gdipProp.id;
prop.Len = gdipProp.len;
prop.Type = gdipProp.type;
prop.Value = new byte [gdipProp.len];
Marshal.Copy (gdipProp.value, prop.Value, 0, gdipProp.len);
}
