As I could not type the whole question in Subject so I have added ... at the end.
The actual there are two question:
1. What do we get when we try to retrieve IEBitmap from ImageEnView control which contains multiple Layers and Current Layer is other then the Background Layer?
What I am getting is only a patch of Gray color.
2. I have also observed that if we assign an ImageEnView control containing multiple Layers to an empty ImageEnView control only the background is copied over. Why?
1. Show your code... the bitmap is from the current layer.
2. If you assign one ImageEnView to another you should get all layers and IO params according to the help file: // Copy content from another TImageEnView, including layers and IO params ImageEnView1.Assign(ImageEnView2); // Copy only the image of another TImageEnView ImageEnView1.Assign(ImageEnView2.IEBitmap);
When I assign here: ImageEnView2.Assign(ImageEnView1); ImageEnView2 is not gray. ImageEnView2 contains all bitmaps and layers from ImageEnView1; I do not have to call ImageEnView2.Update here but it may be necessary to be sure the control refreshes.
var
TheImage, Img: TIEBitmap;
begin
imgView.LayersAdd;
imgView.Layers[1].Assign(MainForm.ImageEnViewMain.CurrentLayer);
TheImage.Assign(imgView.Layers[imgView.LayersCurrent].Bitmap); //<= This is giving error
end;
The last line is giving error in spite of the fact that both TheImage and imgView.Layers[imgView.LayersCurrent].Bitmap are TIEBitmap.
Put a break point on the offending line and run in debug mode. When the cursor is on The Image look to see if it is nil in the hint. Also look at imgView.LayersCurrent].Bitmap to see if it is nil.
If either of these is nil for some reason there will be an exception. What exception are you getting?... be specific... just telling us you get an error does not help us at all to assist you.
quote:Put a break point on the offending line and run in debug mode. When the cursor is on The Image look to see if it is nil in the hint. Also look at imgView.LayersCurrent].Bitmap to see if it is nil.
On the offending line the variable TheImage is nil while the source contains an Image in it.
When I copied the Form from Roys sample folder to my project's folder and added it to my Delphi Project. For some unknown reasons all the events of various controls were disconnected!!??!!
On correcting this it started working.
But...but.
The image is not loading in the control at the moment.
Search
What do we get in TIEBitmap...
Posted - Mar 14 2015 : 08:08:14
