Getting the original size of an image in a picture control

[gdargaud]

Hello all,

how do I get the original size of the image contained within a picture control (which has been resized) ?

I thought I could simply do:

SetCtrlAttribute(pnl, ctrl, ATTR_FIT_MODE, VAL_SIZE_TO_IMAGE);
GetCtrlAttribute(pnl, ctrl, ATTR_WIDTH,  &W);
GetCtrlAttribute(pnl, ctrl, ATTR_HEIGHT, &H);

But I still get the size of the control, not the image. Even if I call ProcessDrawEvents in between.

[RobertoBozzolo]

You may be running into this trouble if your picture controle is overlapped or hidden while you resize it: see Luis explanation in this discussion.

[gdargaud]

Hmmm, yes, that's the situation described: my control is behind a partially transparent other control (it's a background image which must be positionned precisely).

I read the thread you mention so I tried the following but it still doesn't work:

	SetCtrlAttribute(pnl, ctrl, ATTR_ZPLANE_POSITION, 0);
	SetCtrlAttribute(pnl, ctrl, ATTR_FIT_MODE, VAL_SIZE_TO_IMAGE);
	ProcessDrawEvents ();
	GetCtrlAttribute(pnl, ctrl, ATTR_WIDTH,  &P_W);
	GetCtrlAttribute(pnl, ctrl, ATTR_HEIGHT, &P_H);
	SetCtrlAttribute(pnl, ctrl, ATTR_FIT_MODE, VAL_SIZE_TO_PICTURE);
	SetCtrlAttribute(pnl, ctrl, ATTR_ZPLANE_POSITION, 255);

[RobertoBozzolo]

Well, the strange thing is that I don't need to play with the zplane position to have the correct dimensions of the control! I made a sample project for the original poster of the discussion I linked: now I have modified it placing a graph on top of the picture control but I get the correct height and width with no additional calls than load the picture and get the corresponding attributes!

I am attaching the project so you can play with it and see if and how our codes differ: maybe differences can help us understand what's happening.

[gdargaud]

Thanks. Your code works as expected. I modified it to look like mine (same kind of controls) and it still works. Mine doesn't. I'm gonna sleep on it...