Taking screenshot behind the form using magnification

[EWeiss]

what your want, that?

http://www.delphipraxis.net/1393413-post19.html

greets

[victorlus]

Zitat von EWeiss:

what your want, that?

http://www.delphipraxis.net/1393413-post19.html

greets

So in my case I can not hide the form, I need to make it visible to the client all the time

[EWeiss]

Zitat von victorlus:

Zitat von EWeiss:

what your want, that?

http://www.delphipraxis.net/1393413-post19.html

greets

So in my case I can not hide the form, I need to make it visible to the client all the time

i think that is only available with DirectX.
Magnification is not the way to do it and will not work in conjunction with DWM.

EDIT:
without hide or minimize your form.. see

Zitat:

Windows doesen't render invisible parts of the screen due to performance issues. At least older Windows versions didn't render invisible parts of the screen.

if the form hidden or minimized then a simple BitBlt Call should work on all Window Versions to


greets

[Zacherl]

Zitat von victorlus:

So in my case I can not hide the form, I need to make it visible to the client all the time

Could you please explain what EXACTLY you are trying to achieve? There might be an easy way to work around that problem. The magnification API is a hack .. I remember reading the article you linked in your original post. The author stated that it is not possible to obtain a bitmap from the maginification window and thats why he used the (deprecated) callback to manually save the bitmap.

I guess the magnification API uses DirectX to paint the screenshot, so you might be able to intercept that process by hooking some DirectX interfaces, but thats hacky as well.

[victorlus]

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

[Rollo62]

Are you looking for hidden changes behind the form ?
I'm afraid Windows won't update the hidden regions at all, for a good reason: Performance.
They only might get updated when these regions get visible.

Rollo

[Zacherl]

Zitat von victorlus:

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

Yeah I understood that, but WHY do you want to do that?

[victorlus]

Zitat von Zacherl:

Zitat von victorlus:

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

Yeah I understood that, but WHY do you want to do that?

I need to do this, to monitor what's behind the form
My program will work this way, visible to the client all time, I can see what is behind the form

[Zacherl]

Zitat von victorlus:

Zitat von Zacherl:

Zitat von victorlus:

My goal is to be able to capture what's behind the form, which works on win7, win8, win10, if it's very difficult I can pay to do it for myself.

Yeah I understood that, but WHY do you want to do that?

I need to do this, to monitor what's behind the form
My program will work this way, visible to the client all time, I can see what is behind the form

Mhh sorry, I guess I cant help you with that. Not sure whats the purpose of such a program. You could use PrintWindow for specific windows (you might even be able to compose your own "desktop" by iterating through all visible windows). This should work for background windows, but might not work for minimized ones.