public void Change(IntPtr newCursor, SystemCursorId targetCursorId)
{
if (newCursor == IntPtr.Zero)
{
throw new ArgumentNullException("newCursor");
}
if (originalCursorPointers[targetCursorId] == IntPtr.Zero)
{
var originalCursor = PInvoke.Cursor.Functions.LoadSystemCursor(IntPtr.Zero, targetCursorId);
if (originalCursor != IntPtr.Zero)
{
var originalCursorCopy = PInvoke.Resources.Functions.CopyImage(originalCursor,
ImageType.IMAGE_CURSOR, 0, 0, CopyImageFlag.LR_NONE);
if (originalCursorCopy != IntPtr.Zero)
{
if (PInvoke.Cursor.Functions.SetSystemCursor(newCursor, targetCursorId))
{
originalCursorPointers[targetCursorId] = originalCursorCopy;
}
else
{
throw new PInvokeException("Unable to set system cursor");
}
}
else
{
throw new PInvokeException("Unable to copy original cursor");
}
}
else
{
throw new PInvokeException("Unable to load original cursor");
}
}
else
{
if (!PInvoke.Cursor.Functions.SetSystemCursor(newCursor, targetCursorId))
{
throw new PInvokeException("Unable to set system cursor");
}
}
}
public static extern bool SetSystemCursor(IntPtr cursor, SystemCursorId systemCursorId);
public static extern IntPtr LoadSystemCursor(IntPtr module, SystemCursorId systemCursorId);
public void Copy(SystemCursorId sourceCursorId, SystemCursorId targetCursorId)
{
var sourceCursor = PInvoke.Cursor.Functions.LoadSystemCursor(IntPtr.Zero, sourceCursorId);
if (sourceCursor != IntPtr.Zero)
{
var sourceCursorCopy = PInvoke.Resources.Functions.CopyImage(sourceCursor,
PInvoke.Resources.Structures.ImageType.IMAGE_CURSOR, 0, 0,
PInvoke.Resources.Structures.CopyImageFlag.LR_NONE);
if (sourceCursorCopy != IntPtr.Zero)
{
Change(sourceCursorCopy, targetCursorId);
PInvoke.Cursor.Functions.DestroyCursor(sourceCursorCopy);
}
else
{
throw new PInvokeException("Unable to copy source cursor");
}
}
else
{
throw new PInvokeException("Unable to load source cursor");
}
}
private bool TryRestoreOne(SystemCursorId cursorId)
{
var result = false;
IntPtr cursorHandle = originalCursorPointers[cursorId];
if (cursorHandle != IntPtr.Zero)
{
result = PInvoke.Cursor.Functions.SetSystemCursor(cursorHandle, cursorId);
PInvoke.Cursor.Functions.DestroyCursor(cursorHandle);
originalCursorPointers[cursorId] = IntPtr.Zero;
}
return result;
}
public void RestoreOne(SystemCursorId cursorId)
{
IntPtr cursorHandle = originalCursorPointers[cursorId];
if (cursorHandle != IntPtr.Zero)
{
var changed = PInvoke.Cursor.Functions.SetSystemCursor(cursorHandle, cursorId);
PInvoke.Cursor.Functions.DestroyCursor(cursorHandle);
originalCursorPointers[cursorId] = IntPtr.Zero;
if (!changed)
{
throw new PInvokeException("Unable to set system cursor");
}
}
else
{
throw new InvalidOperationException("This cursor was not changed");
}
}
public void ReloadOne(SystemCursorId cursorId)
{
if (originalCursorPaths == null)
{
try
{
InitReload();
}
catch (Exception ex)
{
throw new PInvokeException("Unable to read cursor paths from system registry", ex);
}
}
var cursorPath = originalCursorPaths[cursorId];
if (cursorPath == null)
{
throw new PInvokeException("Unable to read cursor path from system registry", null);
}
var newCursor = PInvoke.Cursor.Functions.LoadCursorFromFile(cursorPath);
if (newCursor == IntPtr.Zero)
{
throw new PInvokeException("Unable to load original cursor from file", null);
}
IntPtr originalCursor = originalCursorPointers[cursorId];
if (originalCursor != IntPtr.Zero)
{
PInvoke.Cursor.Functions.DestroyCursor(originalCursor);
originalCursorPointers[cursorId] = IntPtr.Zero;
}
if (!PInvoke.Cursor.Functions.SetSystemCursor(newCursor, cursorId))
{
throw new PInvokeException("Unable to set system cursor", null);
}
}
